DEV Community: Priya Patel

The $1,200 Yearly Tax on Remote Developers (And How to Stop Paying It)

Priya Patel — Fri, 03 Apr 2026 18:49:55 +0000

The $1,200 Yearly Tax on Remote Developers (And How to Stop Paying It)

I freelanced for a Berlin startup last year. €4,200 invoice. Ended up with $4,437 in my account after Wise. My friend used his regular US bank for a similar gig: $4,312.

Same client. Same work. $125 difference. On one invoice.

That's a 2.8% tax on being a remote developer. Do that monthly and you're throwing away $1,200+ per year to currency friction.

Where the Money Disappears

Most developers don't think about exchange rates. They invoice, the money arrives, they move on. But here's what actually happens:

The (Invisible) Bank Fee Stack:

Your client's bank converts EUR→USD at their rate
Your bank receives it and marks it up again
International wire fee: $15–50
Receiving fee: $10–25
If you used SWIFT: mystery intermediary bank takes $20–40

On a $5,000 invoice, you can lose $150–300 to fees and bad rates. That's a MacBook every 3 years in pure banking overhead.

The Mid-Market Rate Racket

Banks and payment processors use retail exchange rates, not the real rate you see on XE.com or Bloomberg.

Rate Type	Markup	On $5k Invoice
Mid-market rate	0%	$5,000
Bank retail rate	2–3%	$4,850–4,900
Bank + wire fees	3–5%	$4,750–4,850

Your bank isn't "converting" your money. They're selling you a worse rate and pocketing the spread.

Developer-Specific Pain Points

Getting paid by EU clients. A $6,000 monthly retainer becomes $5,820 after bank conversion. $2,160/year lost to friction.

Paying for EU SaaS. That €49/month Linear subscription? Your bank charges you $58 instead of $54. Small but adds up.

Moving countries. I know a dev who relocated from SF to Lisbon. Moved his savings via wire transfer. Lost $4,200 on a $150k transfer. Took him 2 minutes to initiate the transfer. Took the bank $4,200 in hidden fees.

What Actually Works

For freelancers/consultants:

Wise Business. Invoicing in client's currency, zero conversion fees, real mid-market rate. EUR→USD arrives in 1 business day, not 3–5.

For full-time remote employees:

Multi-currency accounts. Revolut, Wise, N26. Get paid in EUR, hold it, convert when rates favor you. Some devs I've talked to time their conversions and save 1–2% just by waiting.

For SaaS subscriptions:

Virtual cards. Privacy.com or Wise virtual cards. Pay in EUR when the rate is good, lock in the savings.

The Reality Check

I used to not care about this. "It's just fees, whatever." Then I calculated it: $1,400+ last year to banks for the privilege of moving my own money.

That's a conference ticket. A new monitor. A week of vacation.

The fix is simple: know the real mid-market rate before you accept payment or pay for anything international.

The Tool

I built a dead-simple currency converter that shows the live mid-market rate. No signup, no hidden fees benchmark. Just the rate you should expect before any bank gets their cut.

Try it: Live Currency Converter

Posted by @priya_saas — Building tools that save developers time and money.

How to Calculate Age in JavaScript (Beyond Adding or Subtracting Years)

Priya Patel — Fri, 03 Apr 2026 18:14:03 +0000

When most developers need to calculate age, they do this:

const age = new Date().getFullYear() - birthYear;

It is wrong more often than you would think.

A proper age calculator handles leap years, timezone offsets, and exact day-level differences. Here is how the math actually works — and how we built a tool that gets it right.

The Naive Approach and Why It Fails

The naive approach:

const age = new Date().getFullYear() - birthDate.getFullYear();

This fails in two common scenarios:

1. Birthdays later this year
If today is March 10, 2026, and someone was born June 20, 1990, the naive formula gives 2026 - 1990 = 36, but their birthday has not happened yet, so they are still 35.

2. Timezone edge cases
If someone was born in a timezone that is ahead of yours, their birthday technically happens earlier in UTC. A calculator that ignores timezone offsets can be off by one day.

The Correct Algorithm

The correct logic:

function calculateAge(birthDate) {
  const today = new Date();

  let years = today.getFullYear() - birthDate.getFullYear();
  const monthDiff = today.getMonth() - birthDate.getMonth();
  const dayDiff = today.getDate() - birthDate.getDate();

  // If birthday has not occurred this year yet, subtract 1
  if (monthDiff < 0 || (monthDiff === 0 && dayDiff < 0)) {
    years--;
  }

  return years;
}

This handles the not-yet-had-birthday-this-year case correctly.

Leap Year Handling

February 29 is the most common edge case. If someone was born on Feb 29, what is their age on March 1 in a non-leap year?

In JavaScript:

const birthday = new Date("1992-02-29");
const oneYearLater = new Date("1993-03-01");
// JavaScript rolls Feb 29 → Mar 1 in non-leap years

A robust calculator normalizes Feb 29 to Feb 28 or Mar 1 consistently based on your business rule. Most legal/practical definitions use Feb 28 as the fallback.

Exact Age Down to Seconds

For use cases like medical dosing, precision timing, or legal age verification, you need exact age:

function exactAge(birthDate) {
  const now = new Date();
  const diffMs = now - birthDate;

  const seconds = Math.floor(diffMs / 1000);
  const minutes = Math.floor(seconds / 60);
  const hours = Math.floor(minutes / 60);
  const days = Math.floor(hours / 24);

  const years = Math.floor(days / 365.25); // 365.25 accounts for leap years
  const remainingDays = Math.floor(days % 365.25);

  return { years, days: remainingDays, hours, minutes, seconds };
}

Using 365.25 days per year handles leap years without needing explicit leap year logic.

Timezone Edge Cases

If your calculator accepts input from users across timezones, store dates in UTC or normalize to a consistent reference timezone before calculating.

// Store as UTC midnight, reference timezone
const birthDateUTC = Date.UTC(
  birthDate.getFullYear(),
  birthDate.getMonth(),
  birthDate.getDate()
);

This prevents the midnight-boundary bug where a calculation changes depending on when (in which timezone) the code runs.

What We Built

We built a free age calculator that handles all these cases:

Exact age in years, months, days, hours, minutes, and seconds
Leap year and timezone normalization
Planet age equivalents (Mercury through Neptune)
Timezone-aware for edge case inputs
Works offline, no sign-up, no data stored

The key lesson: date math looks simple until it is not. The naive approach is fine for rough estimates, but anything that matters — legal age verification, medical calculations, precise billing — needs the correct algorithm.

// Production-ready age check
function isOfAge(birthDate, legalAge) {
  const today = new Date();
  const cutoff = new Date(today);
  cutoff.setFullYear(cutoff.getFullYear() - legalAge);

  // Must be strictly before (not on) the birthday
  return birthDate < cutoff;
}

That is a cleaner, more defensible way to verify age than year subtraction. The difference matters more often than you would expect.

Amortization Tables Explained: The Math Behind Any Loan

Priya Patel — Fri, 03 Apr 2026 18:09:28 +0000

Amortization Tables Explained: The Math Behind Any Loan

If you have ever wondered why your mortgage payment is mostly interest in year one and mostly principal in year twenty, this post breaks it down — with actual numbers and a plain-English explanation of how amortization works.

What Is Amortization?

Amortization is the process of spreading loan payments over time so that each payment covers:

The interest accrued that period
A reduction in the principal balance

Early in the loan is life, interest makes up most of the payment. As the principal shrinks, less interest accrues, so more of each payment goes toward the principal. This is why your balance drops slowly at first and accelerates toward the end.

The word "amortize" comes from the Latin admortire, meaning "to kill off" — as in, killing off the debt.

The Core Formula

Every amortizing loan uses this payment formula:

M = P * [r(1+r)^n] / [(1+r)^n - 1]

Where:

M = monthly payment
P = principal (amount borrowed)
r = monthly interest rate (annual rate ÷ 12)
n = total number of payments (years × 12)

Here is the same formula in JavaScript:

function calculateMonthlyPayment(principal, annualRate, years) {
  const r = annualRate / 100 / 12;
  const n = years * 12;
  if (r === 0) return principal / n;
  const payment = principal * (r * Math.pow(1 + r, n)) / (Math.pow(1 + r, n) - 1);
  return Math.round(payment * 100) / 100;
}

// Example: $250,000 mortgage at 6.5% for 30 years
calculateMonthlyPayment(250000, 6.5, 30);
// → 1580.17

That $1,580.17/month is the same regardless of how the balance changes. What is different each month is how that payment is split between interest and principal.

Building an Amortization Table

Here is how the split works for the first month of our example:

function buildAmortizationRow(balance, annualRate, payment) {
  const monthlyRate = annualRate / 100 / 12;
  const interest = Math.round(balance * monthlyRate * 100) / 100;
  const principal = Math.round((payment - interest) * 100) / 100;
  const newBalance = Math.round((balance - principal) * 100) / 100;
  return { interest, principal, newBalance };
}

// Month 1
buildAmortizationRow(250000, 6.5, 1580.17);
// → { interest: 1354.17, principal: 226.00, newBalance: 249773.00 }

That month: $1,354 goes to interest, $226 goes to principal.

By month 180 (year 15), the split looks very different:

// Running the same function with a 15-year-old balance
buildAmortizationRow(199412.50, 6.5, 1580.17);
// → { interest: 1079.32, principal: 500.85, newBalance: 198911.65 }

Now $1,079 goes to interest, $500 goes to principal. The principal portion has more than doubled.

The Interest-Principal Flip

This is the part that surprises most people:

Year	Total Paid	Interest	Principal	Balance
1	$18,962	$16,147	$2,815	$247,185
10	$189,620	$126,823	$62,797	$198,456
20	$189,620	$61,000	$128,620	$96,000
30	$189,620	$0	$189,620	$0

By year 10, you have paid $189,620 but only reduced the balance by $51,544. That is because $126,823 went to interest.

This is why extra payments early in the loan are so powerful — they skip the interest and go straight to principal, and that principal reduction compounds forward, skipping all future interest on that amount.

The Extra Payment Effect

An extra $100/month on our example loan:

Reduces total interest by $29,000+
Cuts the loan term by 4+ years

The math works because skipping $100 of principal in month 1 means you recalculate all future interest on a $100 lower balance — and that saving repeats for every remaining month.

Why Understanding This Matters

Most loan calculators show you a number. Understanding amortization lets you:

Know why your balance barely moved in year one
Decide whether extra payments make sense for your situation
Understand why 15-year mortgages cost less in total interest than 30-year mortgages
Recognize when a "low payment" deal is actually expensive

If you want to run your own numbers without building the table by hand, the Loan Calculator at Everyday Tools Hub generates a full amortization schedule for any loan amount, rate, and term.

All calculations use the standard amortizing loan formula. Results are illustrative — actual payments may vary slightly due to rounding and escrow.

The $1,200 Yearly Tax on Remote Developers (And How to Stop Paying It)

Priya Patel — Thu, 02 Apr 2026 20:32:48 +0000

The $1,200 Yearly Tax on Remote Developers (And How to Stop Paying It)

I freelanced for a Berlin startup last year. €4,200 invoice. Ended up with $4,437 in my account after Wise. My friend used his regular US bank for a similar gig: $4,312.

Same client. Same work. $125 difference. On one invoice.

That's a 2.8% tax on being a remote developer. Do that monthly and you're throwing away $1,200+ per year to currency friction.

Where the Money Disappears

Most developers don't think about exchange rates. They invoice, the money arrives, they move on. But here's what actually happens:

The (Invisible) Bank Fee Stack:

Your client's bank converts EUR→USD at their rate
Your bank receives it and marks it up again
International wire fee: $15–50
Receiving fee: $10–25
If you used SWIFT: mystery intermediary bank takes $20–40

On a $5,000 invoice, you can lose $150–300 to fees and bad rates. That's a MacBook every 3 years in pure banking overhead.

The Mid-Market Rate Racket

Banks and payment processors use retail exchange rates, not the real rate you see on XE.com or Bloomberg.

Rate Type	Markup	On $5k Invoice
Mid-market rate	0%	$5,000
Bank retail rate	2–3%	$4,850–4,900
Bank + wire fees	3–5%	$4,750–4,850

Your bank isn't "converting" your money. They're selling you a worse rate and pocketing the spread.

Developer-Specific Pain Points

Getting paid by EU clients. A $6,000 monthly retainer becomes $5,820 after bank conversion. $2,160/year lost to friction.

Paying for EU SaaS. That €49/month Linear subscription? Your bank charges you $58 instead of $54. Small but adds up.

What Actually Works

For freelancers/consultants:

Wise Business. Invoicing in client's currency, zero conversion fees, real mid-market rate. EUR→USD arrives in 1 business day, not 3–5.

For full-time remote employees:

Multi-currency accounts. Revolut, Wise, N26. Get paid in EUR, hold it, convert when rates favor you. Some devs I've talked to time their conversions and save 1–2% just by waiting.

For SaaS subscriptions:

Virtual cards. Privacy.com or Wise virtual cards. Pay in EUR when the rate is good, lock in the savings.

The Reality Check

I used to not care about this. "It's just fees, whatever." Then I calculated it: $1,400+ last year to banks for the privilege of moving my own money.

That's a conference ticket. A new monitor. A week of vacation.

The fix is simple: know the real mid-market rate before you accept payment or pay for anything international.

The Tool

I built a dead-simple currency converter that shows the live mid-market rate. No signup, no hidden fees benchmark. Just the rate you should expect before any bank gets their cut.

Try it: Live Currency Converter

Posted by @priya_saas — Building tools that save developers time and money.

What Is My IP Address? A Developer's Guide to IP Lookup for Debugging and Security

Priya Patel — Thu, 02 Apr 2026 20:06:56 +0000

What Is My IP Address? A Developer's Guide to IP Lookup for Debugging and Security

Every developer has been there: a deploy fails, an API rejects your request, or a user reports a bug you can't reproduce. One of the first diagnostic steps? Your IP address.

Yet most developers still Google "what is my ip" and click the first ad-laden result. There's a cleaner way.

The 90% Use Case

You need to know your public IP address. Fast. No installation, no terminal digging, no network settings panels.

A simple web-based IP lookup solves this in seconds. Type the URL. See your IP. Done.

But for developers specifically, this basic check unlocks several deeper workflows.

IPv4 vs IPv6: Still Relevant in 2026

IPv6 adoption hit 45% globally this year, yet most developers still think in IPv4. When debugging connection issues or whitelisting IPs, knowing which protocol you're actually using matters.

IP Type	Format	Example
IPv4	32-bit	192.168.1.1
IPv6	128-bit	2001:0db8:85a3::8a2e:0370:7334

Some APIs and CDNs handle IPv4 and IPv6 differently. If your IP lookup tool shows both, you immediately know whether you're on a legacy or modern stack.

Public vs Local: The Confusion

This trips up every junior developer at least once:

Local IP (127.0.0.1, 192.168.x.x) — Only visible inside your network
Public IP — What the internet sees when you make requests

Your local IP won't help when a third-party API asks you to "send us your IP for whitelisting." You need your public address.

Real Debugging Scenarios

1. API Rate Limiting

A client's API blocks your requests. You suspect IP-based rate limiting. You check your IP, add it to their allowlist, problem solved.

2. CDN & Firewall Rules

Cloudflare or AWS WAF blocking your requests? Debug logs show the blocked IP. You verify your current IP matches or adjust the rule.

3. Geographic Content Issues

A site serves different content based on location. Your IP reveals what the server thinks about your geography—useful when VPN testing.

4. HIPAA/GDPR Security Audits

Compliance checks often require logging which IPs accessed sensitive systems. Quick IP verification ensures your audit trails are accurate.

Privacy & Security Angles

Your IP reveals more than you might expect:

ISP and approximate location (city-level)
Whether you're using a VPN or proxy
Potential entry point for targeted attacks

Developers working remotely or on public WiFi should know their IP exposure. A quick lookup confirms whether your VPN is actually masking your traffic.

The Tool

I built a dead-simple IP lookup tool that shows IPv4, IPv6, location, ISP, and ASN data in one view. No tracking. No ads. Just the data you need.

Try it: What Is My IP Address

Related: Everything You Need to Know About IP Addresses — deeper dive into IPv4 vs IPv6, VPNs, and privacy.

Posted by @priya_saas — Building useful tools for developers and everyday users.

The 15-Year vs 30-Year Mortgage Decision: What Banks Don't Tell You

Priya Patel — Sun, 29 Mar 2026 21:47:17 +0000

The standard advice is simple: always take the 15-year mortgage if you can afford it. It's usually correct — but not always. Here's the actual math so you can decide for your specific situation.

The headline numbers

On a $350,000 mortgage at 6.5%:

	30-Year	15-Year
Monthly payment	$2,212	$3,040
Total interest	$446,000	$197,000
Total cost	$796,000	$547,000
Interest savings	—	$249,000

The 15-year saves a quarter million dollars in interest. That's a compelling number.

But the monthly payment gap is $828. Before blindly choosing, you need to know what that $828 actually costs you in other opportunities.

The flip side: what you give up

That extra $828/month could be:

Maxing out a Roth IRA ($583/month — $7,000/year at 30, growing at 7% = ~$600k by retirement)
Extra payments on the 30-year mortgage itself (same effect as the 15-year, with more flexibility)
A fully funded emergency fund (financial security has real value)
Index fund investments (compounding starts sooner, even with smaller amounts)

The biweekly trick

Here's what most advisors don't mention: you can make the 30-year mortgage behave almost exactly like a 15-year without committing to the higher payment.

Take your monthly payment and divide by two — pay half every two weeks instead of monthly. This results in 26 half-payments = 13 full payments per year, not 12. That extra payment per year cuts about 4 years off a 30-year mortgage and saves roughly $30,000-40,000 in interest.

You get most of the 15-year benefit with the flexibility of the 30-year payment. If you hit a rough month, you can always fall back to the regular monthly amount.

When the 15-year actually wins

You have a stable, high income with no other high-interest debt
You are more than 10 years from retirement and need to accelerate mortgage payoff
You are buying in a market where you plan to stay long-term
You value the psychological win of owning your home outright faster

When the 30-year with biweekly is smarter

You are self-employed or have variable income
You want to keep maximum flexibility on where your money goes
You are in your 20s or 30s with decades of compounding ahead in investments
You plan to move within 5-10 years (pre-paying a mortgage you don't keep is a losing strategy)

The PMI variable

If you're putting down less than 20%, the calculation changes. PMI adds real cost — typically 0.5-1% of the loan per year. On a $350,000 loan with 10% down, that's $1,575-3,150/year until you hit 20% equity.

The 15-year gets you to 20% equity faster, which eliminates PMI sooner. Run the numbers with PMI included — it often closes the gap between the two mortgage types significantly.

The tool I built

I built a mortgage calculator that handles the full picture: principal, interest, property tax, insurance, HOA, PMI, and extra payments. You can model the 15-year vs 30-year side-by-side, see the full amortization schedule, and test the biweekly approach.

→ Mortgage Calculator — 15yr vs 30yr, biweekly, full amortization

No account. No tracking. Works on mobile.

The short answer

If you are financially stable, maxing out tax-advantaged retirement accounts, and staying in the home for 10+ years: take the 15-year.

If any of those conditions don't apply: take the 30-year and pay it biweekly. You'll lose some interest savings but gain flexibility that has real financial value.

The worst outcome is taking the 15-year mortgage at the edge of your budget and having to cash out investments or carry credit card debt to cover a gap month.

The Loan Payment Formula Explained: What Banks Don't Show You

Priya Patel — Sun, 29 Mar 2026 16:09:10 +0000

Every loan payment you make is calculated using a formula that your lender knows, understands, and uses to structure your payment schedule. You can learn it too.

The formula is not complicated. Once you know it, you will never be surprised by a payment amount again.

The Formula

M = P × [r(1+r)^n] / [(1+r)^n − 1]

Where:

M = your monthly payment
P = the principal (amount you borrow)
r = your monthly interest rate (annual rate ÷ 12)
n = total number of payments (loan term in years × 12)

Working Through It

You borrow $200,000 at 6% annual interest on a 30-year mortgage.

r = 0.06 ÷ 12 = 0.005
n = 30 × 12 = 360

M = 200,000 × [0.005(1.005)^360] / [(1.005)^360 − 1]
M = 200,000 × [0.005 × 6.0226] / [6.0226 − 1]
M = 200,000 × 0.03011 / 5.0226
M = $1,199.10 per month

That number covers both principal and interest. In the early months, most of each payment goes to interest. Over time, that flips — but the total monthly amount stays fixed.

Why Banks Do Not Want You to Know This

Banks provide your payment amount. They rarely show you the amortization breakdown: how much of each payment is principal versus interest, and how the split changes over time.

With that breakdown, you can answer questions like:

How much do I save by making one extra payment per year?
How much faster do I pay off the loan if I round up my payment?
What does the bank make in total interest over 30 years?

That last number is the one worth knowing. On a $200,000 mortgage at 6% over 30 years, you pay $231,676 in interest — more than the original loan amount.

The Extra Payment Effect

Adding $100 to each monthly payment on that same mortgage:

Total interest saved: $28,239
Loan term shortened by: 4 years, 2 months

Even $50/month makes a real difference over 30 years.

Where the Formula Breaks Down in Practice

The formula assumes a fixed rate. For adjustable-rate mortgages (ARMs), the rate changes at set intervals and the formula needs to be recalculated each time.

It also assumes you pay on schedule. Late payments, deferment, or forbearance all add interest that the basic formula does not account for.

Calculate It Automatically

The Loan Calculator applies this formula instantly and shows your full amortization schedule. No signup, no math required.

Related tools:

Loan Calculator — monthly payment, amortization, extra payment scenarios
Mortgage Calculator — for home purchase planning

Why Your Currency Converter Is Giving You Wrong Numbers

Priya Patel — Sun, 29 Mar 2026 16:05:00 +0000

Most currency converters on the internet are broken in one of two ways. Neither is obvious unless you know what to look for.

The Two Failure Modes

Failure 1: Cached exchange rates

Many free currency converters fetch the exchange rate once and cache it for hours or days. If the EUR/USD rate moved significantly in that window, the conversion will be wrong.

Example: Rate cached 6 hours ago at 1.0800. In that time, the rate moves to 1.0850. A conversion of $1,000 to EUR shows €925.93 — but the real answer at current rates is €921.84. Nearly €4 on a single thousand-dollar conversion.

Failure 2: One-way conversion

Some converters apply the bank buy/sell spread rather than the mid-market rate. This means:

Google shows 1 USD = 0.92 EUR
Your converter shows 1 USD = 0.89 EUR

The difference is the spread embedded in the rate. It looks small. Over many conversions, it adds up.

How to Check if Your Converter Is Cached

Convert the same amount twice in 30 seconds
If the result changes, it is fetching live rates
If it stays the same, the rate is cached

Most broken converters do not update until you refresh the page.

What a Reliable Currency Converter Does

A working currency converter:

Fetches live mid-market rates on every conversion
Does not embed a spread into the rate
Updates automatically when rates move
Works for exotic currencies, not just major ones

The Currency Converter fetches live rates on every conversion — no cached stale rates, no spread embedded in the number.

When It Matters Most

The cached rate problem becomes significant when:

You are comparing prices across international vendors
You are invoicing in a foreign currency and need accuracy
You are calculating international shipping or customs duties
The currency has been volatile recently (emerging market currencies, post-news rate moves)

For casual reference, the difference is trivial. For anything financial, a stale rate can mean real money.

Use the Tool

Use the Currency Converter to get the actual mid-market rate on every conversion. No account, no spread, live data.

Related tools:

Currency Converter — live rates, no spread, no signup
Loan Calculator — for financial planning

Static vs Dynamic QR Codes: A Practical Guide for 2026

Priya Patel — Sun, 29 Mar 2026 15:33:55 +0000

QR codes come in two types. The difference matters more than most people realize — and choosing the wrong one is the most common mistake when printing or sharing QR codes.

Static QR Codes

A static QR code encodes data directly. The data is fixed at generation time. Change the data, you need a new code.

When to use static:

Short URLs and simple text
Print materials that will not change (menus, posters, business cards)
High-volume printing where cost matters (static codes are free)
When you do not need to track scans
No account or signup required

The limitation: You cannot update where a static QR code points without regenerating and reprinting it.

Dynamic QR Codes

A dynamic QR code uses a short URL that redirects to your final destination. The short URL stays fixed — you can update the destination it points to anytime.

When to use dynamic:

Marketing campaigns where you need to change the destination without reprinting
Tracking scan data (location, time, device)
Long URLs that would create dense, hard-to-scan codes
Any situation where the destination URL might change

The limitation: Dynamic QR codes require an account, often a subscription, and the short URL is owned by the service provider.

How to Tell Which You Have

Scan the QR code with your phone camera. If it opens the final destination immediately, it is likely static. If it opens a short URL first (like rebrand.ly/xyz or qr.com/abc) and then redirects, it is dynamic.

Which Should You Use?

For most small businesses and personal use: static is usually the better choice.

Here is why:

Static codes are free
They do not depend on a third-party service staying alive
They work offline once printed
They have no size limit on the encoded data

The only time dynamic makes sense is when you are running campaigns that need tracking data, or when you are printing materials in high volume and need the ability to update the destination after printing.

How to Generate Both

Use the QR Code Generator to create static QR codes for free. No signup, no watermark, export as PNG, SVG, or PDF.

Related tools:

QR Code Generator — free, no watermark, multiple export formats
Currency Converter — free, instant conversion