The latest articles on DEV Community by Partha Pratim Deb (@partha_pratimdeb_58f52e6). https://dev.to/partha_pratimdeb_58f52e6 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4171899%2F8175e34c-6190-48c9-84c9-f4903bec8345.png https://dev.to/partha_pratimdeb_58f52e6 en Partha Pratim Deb Thu, 08 Oct 2026 18:00:36 +0000 https://dev.to/partha_pratimdeb_58f52e6/we-built-27-free-zero-auth-web-calculators-for-developers-founders-2eo2 https://dev.to/partha_pratimdeb_58f52e6/we-built-27-free-zero-auth-web-calculators-for-developers-founders-2eo2 <p>Most modern online calculators are bloated with intrusive banner ads, demand an email address, or send your sensitive financial numbers to remote cloud databases.</p> <p>We decided to build a fleet of <strong>27 institutional-grade web utilities</strong> that follow a strict architecture:</p> <ul> <li> <strong>100% Free &amp; Zero-Auth:</strong> No accounts, no paywalls, no credit cards.</li> <li> <strong>Client-Side Confidential:</strong> Everything runs locally in pure JavaScript and WebAssembly on your machine. Zero data is ever logged to a remote server.</li> <li> <strong>Instant Speed:</strong> Hosted globally on Cloudflare edge infrastructure.</li> </ul> <h3> 🌐 The Central Hub </h3> <p>You can explore the full catalog with live search across all 27 tools here:<br> 👉 <strong><a href="https://parthafinco-hub.pages.dev/" rel="noopener noreferrer">ParthaFinco Tools Directory Hub</a></strong></p> <h3> 🛠️ Featured Developer &amp; AI Tools: </h3> <ol> <li> <strong><a href="https://sqlitewasmquota.pages.dev/" rel="noopener noreferrer">SQLite WASM Storage Quota Estimator</a></strong>: Estimate OPFS (Origin Private File System) limits, browser quotas, and WAL overhead across Chrome, Safari, and Firefox.</li> <li> <strong><a href="https://kvcache-calculator.pages.dev/" rel="noopener noreferrer">LLM KV Cache Memory Size Calculator</a></strong>: Size GPU VRAM for Llama 3, DeepSeek, and Mistral with GQA memory modeling.</li> <li> <strong><a href="https://promptcachecalc.pages.dev/" rel="noopener noreferrer">Prompt Cache Savings ROI Calculator</a></strong>: Model latency cuts and cloud API discounts for Claude 3.5 Sonnet, GPT-4o, and DeepSeek.</li> <li> <strong><a href="https://tokens-to-words-calculator.pages.dev/" rel="noopener noreferrer">Tokens to Words Calculator</a></strong>: Convert AI tokens to words and reading time with a live text tokenizer.</li> <li> <strong><a href="https://supabase-vs-neon-compute-cost-calculator.pages.dev/" rel="noopener noreferrer">Supabase vs Neon Compute Cost Calculator</a></strong>: Compare monthly cloud Postgres billing between flat instances and scale-to-zero serverless CUs.</li> <li> <strong><a href="https://blueskydns.pages.dev/" rel="noopener noreferrer">Bluesky Custom Domain DNS Generator</a></strong>: Generate exact AT Protocol DID DNS TXT records.</li> </ol> <h3> 🏛️ Corporate Tax &amp; Legal Models: </h3> <ul> <li> <strong><a href="https://section-1202-qsbs-exclusion-calculator.pages.dev/" rel="noopener noreferrer">Section 1202 QSBS Exclusion Calculator</a></strong>: Model IRS § 1202 capital gains exclusions ($10M cap vs 10x basis rule).</li> <li> <strong><a href="https://scorp-tax-calculator.pages.dev/" rel="noopener noreferrer">S-Corp Tax Savings Calculator</a></strong>: Compare LLC vs S-Corp tax liability and 15.3% self-employment tax savings.</li> <li> <strong><a href="https://deminimis-safeharbor.pages.dev/" rel="noopener noreferrer">De Minimis Safe Harbor Expense Calculator</a></strong>: Audit small business equipment expensing against IRS § 1.263 rules.</li> <li> <strong><a href="https://fincen-exemption-checker.pages.dev/" rel="noopener noreferrer">FinCEN BOI Exemption Checker</a></strong>: Verify 23 Corporate Transparency Act exemptions.</li> </ul> <p>All tools are completely free to use. Feedback and formula suggestions are always welcome!</p> webdev opensource ai programming