About CheckMySys
CheckMySys is a free suite of network and system utilities. IP lookup, speed test, DNS, password security, and more — no sign-up, no paywall, no bloat.
Two kinds of tools
Every tool on this site falls into one of two categories, and we label each one so you always know what's happening with your data.
These tools run entirely in your browser. Your data never leaves your device — nothing is sent to any server, ever.
Some things can't be measured from inside a browser. Your public IP, real download speed, the headers your browser sends, and DNS records all require a server that observes your connection from the outside.
Privacy stance
Client-side tools process everything locally. The password security checker, for example, never transmits your password — entropy calculation, strength estimation, and common-password detection all happen in JavaScript on your device. We don't log what you type, and there's no server to log it on.
API-backed tools send only the minimum data the server needs to produce a result (your connection for the speed test, a hostname for DNS lookup). We don't store query history or build user profiles. See our privacy policy for the full details.
Open source
CheckMySys is built and maintained by File-Toolkits. The project is split into two repositories:
- sys-toolkit-web — this Next.js frontend. Handles all client-side tools and the UI for API-backed tools.
- sys-toolkit-api — the Go backend that powers IP lookup, speed tests, HTTP header inspection, and DNS queries.
Built with
Questions or feedback?
Open an issue on GitHub or reach out via the repository discussions. We read everything.