About Dev Tools !
A privacy-first, open-source suite of developer utilities built with love by Cosyslabs.
Our Mission
Developers shouldn't have to choose between convenience and privacy. Too many online tools send your sensitive data — JWTs, passwords, hashes, source code — to servers you don't control.
Dev Tools ! runs 100% in your browser. No server round-trips for tool processing. No tracking of your inputs. No paywalls for core features.
Open Source Philosophy
We believe developer tools should be transparent and auditable. Dev Tools ! is fully open source under the MIT licence. You can inspect the code, fork it, self-host it, or contribute new tools.
⭐ View on GitHub →Tech Stack
About Cosyslabs
Cosyslabs is an independent software studio focused on building useful, privacy-respecting tools for developers. We're a small team with a big belief: software should serve its users, not the other way around.
Visit cosyslabs.com to learn more about our studio and the people behind it.
Part of the Cosyslabs Family
Dev Tools ! is part of a growing family of free, privacy-first tools built by Cosyslabs:
- Astrilio — Free property management calculators for landlords and real estate investors
- RoughEstimator — Quick construction and renovation cost estimators
- UnitConvertAll — Comprehensive unit and measurement converters
- PDFConvertAll — Free PDF conversion and compression tools
- RoutineToolkit — Everyday productivity and routine calculators
- CastFleet — Content calendar and social media management
- Cosyslabs — The company portfolio and studio behind all these tools