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a0.dev
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Control your phone with natural language. Tap less, live more.

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 | app.tangoapp.dev | certdecoder.com |
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| Company | 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of TangoApp.dev yet.
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
An editorial look at what each product does well and who it suits.


No analysis of TangoApp.dev yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Using AI agent to operate a cellphone to query weather
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing TangoApp.dev and Cert Decoder.
TangoApp.dev's answer
Two years ago, we built Tango ADB, an Android tool to allow users to control phone from browser. And now, we want Tango ADB to step into AI era, so here comes Tango Android AI.
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.
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
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
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.
TangoApp.dev's answer
Tango Android AI uses ADB shell and with Web USB protocol to make it possible to assess an android phone from browser. Combine with LLM, user can simply use natural language to control phone and let AI automated get tasks done.
Share your experience with using TangoApp.dev 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 TangoApp.dev since Aug 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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