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Free browser-based utility tools developers and freelancers. Privacy-first, no signup, DACH-focused.

Decode and verify SSL/TLS certificates online. Extract X.509 details including issuer, validity, SAN, and fingerprint. Fast, secure, and browser-based.

Which is more popular?
Based on our record, Cert Decoder seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | toolflux.app | certdecoder.com |
| Pricing | ||
| Platforms | — | |
| Company | 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


Toolflux is a free, browser-based collection of utility tools - password generators, encoders/decoders, JSON formatter, QR/UUID/timestamp tools, percentage and tip calculators, color converters, and DACH-specific calculators (Stundensatz, Brutto-Netto, Mehrwertsteuer, Arbeitstage). Every tool...
Cert Decoder is a free online tool that helps you decode X.509 SSL/TLS certificates in PEM format. It instantly shows important information like the issuer, expiry date, SAN entries, and fingerprint. All data is processed locally in your browser, so nothing is ever sent or stored elsewhere.
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Toolflux.app and Cert Decoder.
Toolflux.app's answer
Toolflux launched on April 21, 2026 as a 30-day build challenge in Germany: one new utility per day, each paired with an explainer, all running in the browser. The DACH focus is deliberate — German-language calculators (hourly rates, gross/net salary, VAT, working days) usually live on sites with poor explanations or behind login walls. After the iniital build phase, the cadence settles into new tools every week, same approach. Toolflux runs self-funded with no external investors; every launch is logged publicly on X @toolflux and Bluesky @toolflux.bsky.social so anyone can follow for updates.
Cert Decoder's answer:
I built certdecoder.com over the weekend for my own needs. Sometimes in my work, I need to verify and check certificate details.
Toolflux.app's answer
Astro for static-first rendering, TypeScript across the codebase and Svelte for each tool's logic, which runs client-side: calculations happen in the user's browser, no inputs sent to any server.
Cert Decoder's answer:
certdecoder.com was built using just JavaScript and HTML—simple, fast, and with all processing happening locally in your browser, so no certificate data is sent to any server
Toolflux.app's answer
Developers reaching for a quick utility: JSON formatter, Base64 encoder, JWT decoder, UUID generator, hash generator, crontab generator. And freelancers / self-employed users in the German-speaking market who need calculators that mainstream tools skip: hourly rate, gross/net salary, VAT, working days. Both groups share the same expectation: open the page, get the work done, leave. No signup, no install.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Toolflux.app's answer
Three reasons: 1. every tool comes with an explainer, so users leave a better understanding, not just holding a result. 2. The catalogue includes DACH-specific finance calculators (Stundensatz, Brutto-Netto, Mehrwertsteuer, Arbeitstage) that most English-first multi-tool sites either don't have or hide behind login walls. 3. Everything runs in the browser without an install or account — open Toolflux on any device, and use it immediately.
Cert Decoder's answer:
Simple, fast, and reliable. Some similar tools can’t even decode basic certificates. I rigorously tested my tool with many real-world certificates and covered several edge cases where competitors fall short.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Toolflux.app's answer
Toolflux pairs every utility with a built-in explainer. The password generator shows entropy in bits, not just a "strong / weak" badge. The hash generator visualises the avalanche effect when you flip an input bit. The JWT decoder runs a pitfall check. It also covers DACH-specific calculators - German hourly rates, gross/net salary, VAT, working days - that English-first multi-tool sites tend to skip. Every tool runs entirely in the browser; inputs never leave the device.
Share your experience with using Toolflux.app and Cert Decoder. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking Toolflux.app since May 2026.
Why? Because I built certdecoder.com and couldn’t find a decent place to submit it. So I said screw it — I’ll build my own. With blackjack and hookers. - Source: dev.to / over 1 year ago
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