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FastestChecker
20 free, no-signup web tools every developer needs
FastestChecker is a free toolkit of 20+ browser-based utilities for developers: IP checker, JWT decoder, email validator, password generator, speed test, and more. No signup, no paywalls, most tools run entirely client-side.
Hey Product Hunt!
I built FastestChecker because I was tired of having 15 browser tabs
open just to do routine dev checks — what's my IP, is this JWT valid,
will this email actually bounce — each one behind a different sign-up
wall or ad-gated redirect.
FastestChecker puts 20+ of these tools in one place, free, with no
account required. A few I use almost daily:
IP Checker — see your current public IPv4/IPv6 in one click
JWT Decoder — inspect a token's header/payload without pasting it
into a random site you don't trust
Email Validator — syntax + MX record checks before you trust a
signup
Password Generator — configurable, generated entirely client-side
Speed Test, PageSpeed Checker, Domain Age Checker, and more
Most of these run client-side in your browser — nothing gets sent to
a server just to check your own IP or generate a password.
Would love feedback on what's missing. What's the one "quick check"
tool you always end up hunting for online? Happy to add it.
Thanks for checking it out!
Love that everything runs right in the browser without an account. The JWT decoder was super handy for debugging a token issue at work this week.
The JWT decoder and password generator alone make this worth bookmarking, and everything ran instantly without any signup slowing me down.
The client-side approach is a nice touch, means my test data never leaves the browser. Tried the JWT decoder and it gave me exactly what I needed without any signup friction.
Love that the tools run client-side with zero signup friction. The JWT decoder especially feels snappy and clean.
Love that everything runs client-side, it makes the IP checker feel instant and keeps things private. The no-signup approach is refreshing too.
Finally something that doesn't beg for a login before I can decode a JWT. Used the IP checker and password generator today, both worked instantly in the browser.
having a quick-access option like a chrome extension or bookmarks toolbar popup would be amazing for using these tools without opening the site every time.
Client-side tools that actually load instantly are rare, and the JWT decoder here is the cleanest I've used in a while. Nice to see the no-signup approach still alive.
A dark mode toggle for all the tools would be great since I usually end up on these late at night and the bright white background gets harsh. Bonus points if it remembers the preference between sessions.
Finally something that just works without making me sign up for an account first. The JWT decoder ran instantly in my browser and I love that the password generator doesn't even hit a server.
Client-side tools are great but a PWA version would be a nice touch so I could pin specific ones like the JWT decoder and speed test to my home bar without digging through a full tab.
Honestly the no-signup thing is what got me, just opened it and decoded a jwt in like two seconds. Kinda nice having everything in one place without getting hit with a paywall.
About FastestChecker on Product Hunt
“20 free, no-signup web tools every developer needs”
FastestChecker was submitted on Product Hunt and earned 14 upvotes and 13 comments, placing #160 on the daily leaderboard. FastestChecker is a free toolkit of 20+ browser-based utilities for developers: IP checker, JWT decoder, email validator, password generator, speed test, and more. No signup, no paywalls, most tools run entirely client-side.
FastestChecker was featured in Productivity (656.7k followers), SEO (37.9k followers) and Developer Tools (516.3k followers) on Product Hunt. Together, these topics include over 234.4k products, making this a competitive space to launch in.
Who hunted FastestChecker?
FastestChecker was hunted by Muhammad Asad Arshad. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how FastestChecker stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Muhammad Asad Arshad