MicroKit

20+ free, fast, client-side utility tools. No backend, no tracking, works offline.

Finance, health, productivity, and development tools — all running locally in your browser.

All Tools

Click any tool to open it. All calculations run locally in your browser.

Why Choose MicroKit?

100% Client-Side & Private

Every tool on MicroKit runs entirely in your web browser using JavaScript. Your data never leaves your device — no servers, no databases, no tracking. This means:

  • Complete privacy: No analytics, no cookies, no user accounts, no data collection whatsoever.
  • Works offline: Once loaded, most tools function without an internet connection.
  • Instant results: No network latency — calculations happen in milliseconds.
  • No lock-in: No accounts to create, no subscriptions, no vendor lock-in.

Built for Speed & Accessibility

MicroKit follows modern web best practices:

  • Semantic HTML5 for screen reader compatibility
  • WCAG 2.1 AA contrast ratios in both light and dark modes
  • Keyboard-navigable interfaces with visible focus states
  • Responsive design that works on mobile, tablet, and desktop
  • Minimal dependencies — just vanilla HTML, CSS, and JavaScript

20 Tools Across 6 Categories

Whether you're a student, professional, developer, or just need a quick calculation, MicroKit has you covered:

  • Finance: Compound interest, profit margins, invoice generation, percentage/tax calculations
  • Health & Fitness: Calorie/TDEE calculator, 1RM strength estimator, hydration & creatine, HIIT/Tabata timer
  • Education: GPA/grade calculator, weekly schedule maker with PNG export
  • Text & Writing: Word/character counter with reading time, APA/MLA citation generator
  • Media & Development: Image compressor (WebP), QR code generator, WhatsApp link generator, JSON formatter & CSS minifier
  • Utilities: Secure password generator, color palette & WCAG contrast checker, random wheel spinner, bill split calculator

Available in English & Spanish

MicroKit is fully bilingual. Switch between English (/en/) and Spanish (/es/) instantly using the language toggle in the navigation bar. All 20 tools, legal pages, and documentation are available in both languages with proper hreflang tags for SEO.

Frequently Asked Questions

Is MicroKit really free?

Yes, all tools on MicroKit are completely free to use. We support the platform through non-intrusive advertisements (Google AdSense). There are no premium tiers, subscriptions, or hidden fees.

Do you collect my data?

No. All tools run entirely in your browser (client-side). Your inputs, calculations, and generated content never leave your device. We don't use analytics, tracking scripts, or cookies. See our Privacy Policy for details.

Can I use the tool outputs commercially?

Yes. PDFs, images, text, and other outputs generated by MicroKit tools are yours to use freely, including for commercial purposes. You own the output you create.

Do the tools work offline?

Most tools work fully offline once loaded. The initial page load requires an internet connection, but after that, calculations and generators function without connectivity. Features requiring external resources (fonts, ad loading) may not work offline.

Are the calculations accurate?

We implement standard formulas and algorithms. However, for critical financial, medical, or engineering decisions, always verify results independently or consult a qualified professional. See our Terms of Service for the full disclaimer.