Cron generators, regex builders, JSON formatters and more — fast, free, and built for developers who hate friction.
Live example — CronBuilder
Tools
Cron expressions, decoded.
Generate, explain, and validate cron expressions. Get plain-English explanations, next run times, and ready-to-paste code for Node.js, Python, Linux, and GitHub Actions.
Regex without the headache.
Build and test regular expressions with live matching, plain-English token explanations, and a library of 200+ real-world patterns for email, URL, phone, and more.
JSON formatted, typed, and exported.
Format, validate, diff, and transform JSON. Generate TypeScript interfaces, Zod schemas, and convert to CSV or YAML — all in the browser.
Design tokens from one brand color.
Input a single hex color and generate a complete design system — primary/neutral scales, dark mode tokens, WCAG contrast ratios, Tailwind config, and CSS variables.
Professional invoices in 60 seconds.
Create, preview, and download professional PDF invoices without signing up. Add your logo, itemize services, and send to clients — all in the browser.
Know what you're agreeing to.
Paste any Terms of Service URL and get a plain-English summary of the key clauses — data sharing, auto-renewal traps, cancellation policy, and account deletion rights.
Why DevTools?
No install, no login, no config. Open a tool and start working immediately.
Fully browser-based — Windows, Mac, Linux, mobile. Your data stays on your machine.
Every output generates a URL. Share your cron expression, regex, or JSON with one click.
Copy output as Node.js, Python, Linux, GitHub Actions, Docker — whichever stack you use.
Nothing is sent to our servers on the free tier. All processing runs in your browser.
New tools drop regularly. Pro subscribers get early access and shape the roadmap.
Pricing
All tools are free. Upgrade for saved workspaces, team sharing, and priority features.
Pro
≈ ৳490 BDT
Save, share, and unlock power features across every tool.
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