110+ Developer Tools
Free online tools that run entirely in your browser. No signup, no tracking.
Unlock DevKits Pro
Price increases April 1stGet access to 20+ premium tools including SQL to Code, Data Faker, JWT Generator, and more.
Browse by Category
110+ tools organized to find exactly what you need
AI Tools That Think With You
Unlike static utilities, these tools use AI to understand context and give smarter results
AI JSON Fixer
✨ LLMAI repairs broken JSON automatically
Paste broken JSON — AI fixes missing commas, trailing commas, wrong quotes, Python booleans and explains what was wrong.
AI Regex Generator
✨ LLMDescribe it, get the regex
Write in plain English what you want to match. AI generates the regex, explains each part, and lets you test it live.
AI Code Explainer
✨ LLMUnderstand any code instantly
Paste any code. AI explains what it does, finds security issues, suggests optimizations, and answers follow-up questions.
AI Token Counter
✨ AICount tokens, estimate costs
Count tokens and estimate API costs for GPT-4, Claude, Llama before sending requests.
AI Cost Calculator
✨ AICompare API costs across models
Side-by-side cost comparison for OpenAI, Anthropic, Google, and open-source models.
AI Prompt Builder
✨ AIBuild structured prompts
Guided templates for coding, writing, analysis. Copy directly to ChatGPT, Claude, or any AI.
What's New
Most Popular Tools
The tools developers open every day
JWT Decoder
Decode tokens
Decode and inspect JWT tokens. View header, payload, and signature safely.
URL Encoder
Encode & decode URLs
Encode or decode URL strings. Handle special characters and query params.
Password Generator
Secure passwords
Generate strong, random passwords. Customize length and character types.
Regex Tester
Test patterns
Test and debug regular expressions. Real-time matching with highlighting.
HTTP Status Codes
Quick reference
Complete HTTP status code reference. Search by code or description.
Markdown to HTML
Convert markdown
Convert Markdown to HTML with live preview. Copy HTML or rendered output.
Built by an AI Company
DevKits is built to stay fast, free, and improving. New tools ship regularly and everything runs in your browser.
Autonomous Operation
Our AI agents work around the clock, making decisions and shipping features without human intervention.
Privacy First
All tools run locally in your browser. Your data never leaves your device. No tracking, no cookies.
100% Free
All core tools are free. No hidden costs, no premium walls. Pro features are optional and fairly priced.
Learn & Grow
Comprehensive guides and cheat sheets to level up your skills.
How-To Guides
Step-by-step tutorials for common developer tasks. Each guide includes examples and best practices.
Cheat Sheets
Quick reference sheets for popular libraries and frameworks. Keep them bookmarked for instant access.
Comparisons
Head-to-head comparisons to help you choose the right tool for your workflow.
Ready to Build Faster?
Join thousands of developers who use DevKits daily. No signup required — just open and start building.
One email a week. One tool you'll use immediately.
5-minute read. No fluff. Unsubscribe anytime.
No spam. We respect your privacy. Unsubscribe anytime.