DEV Community: tao li

The Best Free Invoice Generator for Freelancers in 2026

tao li — Tue, 11 Aug 2026 14:12:10 +0000

Freelancers and small business owners don't need expensive invoicing software. CedarBill offers a free, no-signup invoice generator that works entirely in the browser — with PDF export, multiple templates, and built-in financial calculators.

What CedarBill Does

CedarBill Free Invoice Generator lets you create professional invoices in minutes. No account required, no watermarks, and no limits on the number of invoices you can generate.

Key Features

No signup, no watermarks — completely free
PDF invoice export
Multiple invoice templates
Multi-currency support
Tax and discount calculations
Built-in freelance calculators: salary, 1099 tax, net terms, sales tax

Built-in Financial Calculators

Beyond invoicing, CedarBill includes tools every freelancer needs:

Salary calculator — hourly to annual conversion
1099 tax calculator — estimate self-employment taxes
Net terms calculator — calculate early payment discounts
Sales tax calculator — add tax to any amount

Start invoicing for free at cedarbill.com/tools/invoice-generator.

Create Custom Map Posters from Any City or Route

tao li — Tue, 11 Aug 2026 14:11:52 +0000

Map posters are a popular way to commemorate special places — a wedding venue, a marathon route, a hometown. With tools like Vellum & Line, you can design and print custom map art right from your browser.

What Vellum & Line Does

Vellum & Line Custom Map Poster Maker lets you create printable map posters from any location, route, or memory. It uses OpenStreetMap data and renders high-quality, customizable designs.

Key Features

City map posters with street-level detail
Route poster maker for runs, rides, and trips
Wedding and event location maps
Multiple style presets (minimal, vintage, modern)
Print-ready PDF export

Use Cases

Gifts: hometown or travel memory posters
Events: wedding venue maps, conference location guides
Sports: marathon and cycling route art
Home decor: city skyline and street grid prints

Design your first map poster at vellumline.app/map-poster-maker.

Turn Text Into Music: AI Song Generation Made Simple

tao li — Tue, 11 Aug 2026 14:11:34 +0000

Making music used to require years of training, expensive software, and studio time. Now with AI tools like Musikalis, you can create original songs, vocals, and royalty-free instrumentals from a text prompt.

What Musikalis Does

Musikalis AI Music Generator converts text descriptions, lyrics, and creative ideas into complete musical tracks. It handles vocals, instruments, and mixing automatically.

Key Features

Text-to-music generation
AI song generator with vocals
Royalty-free instrumental output
Vocal remover tool
AI lyrics generator

How to Get Started

Describe the mood, genre, or style you want
Optionally add your own lyrics
Click generate and wait a few seconds
Download your track

Perfect for YouTube creators, podcasters, and indie musicians. Try it at musikalis.com/ai-music-generator.

Create AI Songs from Text Prompts in Seconds

tao li — Tue, 11 Aug 2026 14:09:39 +0000

AI music generation has come a long way. Platforms like AI Musical let you turn a simple text prompt into a complete song — vocals, instruments, lyrics and all — in seconds.

What AI Musical Does

AI Musical is a Suno-based AI music generator that creates original songs from text descriptions. You can generate full tracks with vocals, instrumental-only versions, or isolate specific parts.

Key Features

Text-to-song generation with AI
AI lyrics generator
Vocal remover and stem separation
Multiple genre and style presets
Creative AI tools for musicians and content creators

Who It's For

Content creators who need royalty-free background music, indie musicians exploring new ideas, and anyone curious about AI-generated music. Start creating at sunoaimusical.com.

Turn Any Real City Into a Minecraft World with OpenStreetMap

tao li — Tue, 11 Aug 2026 14:09:25 +0000

Ever wished you could explore your own city in Minecraft? With tools like CartoVoxel, you can now turn any real-world location into a playable Minecraft world — no mods, no manual building required.

What CartoVoxel Does

CartoVoxel is a real-world Minecraft map generator that uses OpenStreetMap data to create accurate, playable worlds from any geographic location. It supports both Java Edition and Bedrock (.mcworld) formats.

Key Features

Real-world terrain and building footprints from OpenStreetMap
Java Edition (.zip) and Bedrock (.mcworld) export
AI-generated city posters with paid orders
Works in the browser — no mods or plugins needed

How It Works

Enter any address or location on the map
Choose your preferred Minecraft edition
Download the generated world file
Import into Minecraft and start exploring

Perfect for educators, Minecraft enthusiasts, and anyone who wants to explore real cities in-game. Try it at cartovoxel.com.

How to Animate a Logo Without After Effects

tao li — Tue, 11 Aug 2026 08:18:17 +0000

If you've ever needed to animate a logo for social media, you know the usual workflow: open After Effects, deal with keyframes, render, export, repeat. It's slow — especially when you just need a quick 9:16 vertical clip for TikTok or Reels.

LogoFuse takes a different approach. It runs entirely in the browser using WebGL shaders, so you can turn a static logo into motion without any plugins or keyframes.

What LogoFuse Does

9:16 vertical logo animations optimized for TikTok, Reels, and YouTube Shorts
Shader presets (glow, pulse, glitch, and more) with real-time controls
Browser video export — no software to install
No keyframes needed — pick a preset and tweak
Branding tools for creators and small businesses

How It Works

Upload your static logo (PNG/SVG)
Pick a shader preset
Tweak real-time controls (speed, intensity, colors)
Export as 9:16 video for social media

Why Not After Effects?

After Effects is powerful, but it's overkill for simple logo motion. You need:

A license ($55/month or more)
Learning time for keyframes and expressions
Render time for every small change

LogoFuse replaces all that with a drag-and-drop interface and instant WebGL previews. Perfect for content creators, indie hackers, and small brands who need professional logo motion without the After Effects learning curve.

Use Cases

TikTok / Reels — quick vertical intros
YouTube — channel branding
Product launches — animated reveal for social campaigns
Freelancers — fast logo animation without AE overhead

Try it at logofuse.app.

Show DEV: Six Browser Tools, Six Different Product Constraints

tao li — Wed, 15 Jul 2026 13:11:50 +0000

I have been working on a small portfolio of browser tools. They look unrelated at first: a real-world Minecraft map generator, two music workflows, a map-poster studio, an invoice maker, and a logo-motion editor.

The common thread is narrower than the categories suggest. Each product starts with a task that is easy to describe but surprisingly easy to overcomplicate. The most useful product decisions were usually not new features. They were constraints: deciding what the tool should ask, what it should hide, and what a successful export should look like.

Here are six examples and the product lesson behind each one.

1. A map generator should start with a boundary, not a settings panel

Turning a real place into a Minecraft world sounds like a data problem. It is also a scope problem.

A user may type the name of a city, but “the city” is rarely the useful unit. A school project may need a campus. A server owner may need several connected blocks. A creator may care about one landmark and the route leading to it.

That pushed the workflow in CartoVoxel toward an explicit boundary: search for a place, choose the area, then select Java or Bedrock output. Terrain, roads, building footprints, and land cover matter, but they only become meaningful after the user decides what belongs inside the world.

The lesson was simple: when computation and output size grow with scope, make scope visible early. A boundary is not an advanced option. It is part of the product definition.

2. Music prompts improve when the interface asks for constraints

“Make a cinematic song” is not a very useful instruction. It names a broad expectation without explaining the job the track needs to do.

A more useful prompt separates a few variables:

What is the track for?
What should the energy curve feel like?
Which instruments or textures should dominate?
Should vocals lead, support, or disappear?
What must the result avoid?

That is the thinking behind the prompt workflow in AI Musical. The product is not improved by adding more adjectives to a single text box. It improves when the user can turn an idea into a testable direction for songs, vocals, instrumentals, or lyrics.

The broader lesson: “simple” input is not always low-friction input. Sometimes one blank box creates more work because it gives the user no structure for making the next attempt better.

3. A second music workflow can be organized around use cases

Music generation also changes when the starting question is not “Which genre?” but “What should happen while this track is playing?”

Study music, podcast music, a birthday song, a rap draft, and a short social clip all impose different constraints. Duration, density, vocal presence, repetition, and interruption matter at least as much as genre.

In Musikalis, the useful product idea is the workflow around the output: prompts and lyrics lead into songs, vocals, or instrumentals, while supporting tools such as lyrics and vocal-removal flows serve different stages of creation.

This reinforced a product-design rule I keep returning to: categories help discovery, but use cases help decisions. A user may arrive through “AI music,” yet they still need the interface to help answer what the audio is for.

4. Map art needs less information than a navigation map

A navigation map is successful when it explains enough to get somewhere. A map poster is successful when it makes one place feel recognizable.

Those goals conflict. More labels may improve navigation while weakening a poster. A wider crop may add context while removing the visual pattern that made the place interesting.

Vellum & Line is built around that editing problem. The user starts from a real city, neighborhood, venue, coordinate, or route, then changes the crop, label density, colors, typography, layers, and composition before exporting a poster.

The product lesson was that deletion is a feature. A focused design tool should make it easy to remove information that is technically correct but visually unnecessary.

5. Invoice software can be useful without becoming accounting software

Invoice products tend to expand. Once a tool has clients, line items, tax, discounts, and payment terms, it is tempting to keep adding bookkeeping, banking, payroll, and payment processing.

But many freelancers need a smaller job completed: create a clear document, preview it, and download a PDF.

CedarBill keeps that workflow in the browser. It supports invoices, receipts, quotes, and estimates, along with the practical fields that make a document reviewable. Separate calculators cover questions such as markup, salary conversion, estimated 1099 taxes, net terms, and sales tax without pretending to replace professional accounting advice.

The lesson: a tool can be connected to a large business process without owning the entire process. Refusing adjacent complexity can be a legitimate product advantage.

6. Logo animation does not always need a full timeline

Motion-design software is powerful because it can express almost anything. That power also creates setup cost for a narrow job such as a two-second logo reveal.

LogoFuse focuses on that narrow job. A user uploads PNG, SVG, JPEG, or WebP artwork, chooses a shader-based Logo Motion workflow or a frame-based Flash workflow, adjusts colors, scale, position, motion, timing, and audio, then exports a vertical video from the browser.

The constraint is intentional: it is a logo-motion tool, not a generative logo maker and not a replacement for a full desktop video editor.

The product lesson is that a preset is valuable when it removes setup without removing meaningful control. The user should still be able to make the result feel like their brand, but they should not need to construct the entire animation system first.

What these tools have in common

Across all six products, the strongest decisions followed the same pattern:

Name the single job clearly.
Ask for the constraint that changes the cost or quality of the output.
Hide configuration that does not help the next decision.
Make the export or final artifact obvious.
Stop before the product turns into a general-purpose suite.

Browser tools are often described as lighter versions of desktop software. I think that framing misses the interesting part. The browser is useful because it makes a focused workflow immediately available. The real design work is deciding which workflow deserves to stay focused.

Which of these product constraints would you keep, and which one would you remove?

Prompting AI Lofi: A Practical Workflow for Focus Music

tao li — Wed, 29 Apr 2026 01:07:18 +0000

Most people treat study music as a playlist problem. They open a lofi mix, skip a few tracks, and hope the mood is right.

For developers, writers, students, and makers, that is not always enough. The right focus track needs to stay out of the way. It should give the room a steady pulse without pulling attention into lyrics, sudden drops, or busy melodies.

That is where AI lofi can be useful. Not because it is automatically better than human-made lofi, but because it lets you control the brief.

The goal is not better music. The goal is lower friction.

When I test focus music, I care about four things:

It should not compete with language tasks.
It should loop without obvious fatigue.
It should match the work session length.
It should be easy to adjust when the first version is close but not right.

A normal playlist is good for discovery. AI generation is better when you already know the job the track needs to do.

A simple prompt structure for AI lofi

The prompts that work best for focus music are usually not long. They are specific in the right places.

Use this shape:

Create a [mood] lofi track for [use case].
Keep the tempo around [BPM range].
Use [instruments / texture].
Avoid [things that break focus].
Make it feel [reference adjectives].

Example:

Create a calm lofi hip hop track for deep coding sessions.
Keep the tempo around 70-78 BPM.
Use soft drums, warm vinyl texture, mellow keys, and a simple bassline.
Avoid vocals, sharp synths, big drops, and busy lead melodies.
Make it feel steady, late-night, and unobtrusive.

That prompt is plain, but it works because it tells the model what to avoid. For background music, negative constraints matter as much as the style label.

Prompt variables that change the result

Small wording changes can create very different tracks. These are the controls I adjust first.

1. Tempo

For reading or writing, I usually keep it slower. For design work or repetitive tasks, a slightly faster beat can help.

60-70 BPM: reading, writing, slow study
70-82 BPM: coding, planning, research
82-95 BPM: design, light production, repetitive tasks

2. Density

If the track feels distracting, do not just ask for "more chill." Be more direct.

Use fewer melodic layers.
Keep the arrangement sparse.
Avoid lead instruments that take attention.

3. Texture

Texture is what makes AI lofi feel less sterile. I usually test a few variants:

warm vinyl crackle
soft tape hiss
rain outside a window
late-night room tone
muted drum machine

Use one or two. Too many textures can turn into noise.

4. Use case

The phrase "for studying" is broad. A better prompt names the real job.

for reading technical docs
for editing a long essay
for building a landing page
for a 25-minute Pomodoro session
for a quiet Twitch stream background

The model usually responds better when the use case is concrete.

Human lofi still wins on taste

Human-made lofi has stronger taste, better arrangement choices, and more personality. If I want music I will actively listen to, I still reach for artists and curated mixes.

AI lofi is different. I use it when I need a custom utility track:

a loop for a tutorial video
a calm bed for a stream
background music for a product demo
a study track with no vocals
several mood variants for testing

That is a practical use case, not a replacement claim.

The iteration loop

My workflow is simple:

Generate one focused version.
Listen for 30-60 seconds while doing real work.
Identify the one thing that breaks focus.
Rewrite only that part of the prompt.

For example:

The drums are too sharp. Make the kick softer and reduce the snare brightness.

Or:

The melody is too active. Keep the chord progression, but remove the lead line.

That gives better results than starting over with a totally new prompt.

Where Musikalis fits

I tested this workflow with the Musikalis AI lofi generator. The useful part is quick iteration: you can move from a rough mood idea to a more specific lofi brief without treating every track like a full songwriting project.

For SEO and product content, I also like this format because it turns a broad keyword like "AI music generator" into a practical use case: focus music, study music, stream background, video background, or demo music.

My rule of thumb

Use human lofi when you want taste and discovery.

Use AI lofi when you need control, variants, and a track built for a specific job.

That distinction makes the tool more useful and keeps the claim honest.

I wrote the longer comparison here: AI lofi vs human lofi for study music.