Launching today
Poly Duo
Your ChatGPT and Claude apps work together — one tap, free
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Your ChatGPT and Claude apps work together — one tap, free
0 followers
For the first time, your own ChatGPT and Claude apps work together on your phone — one tap, free. Any AI can sound sure and still be wrong. Poly Duo asks both the same question: each answers blind, then Claude compares and shows where they agree, where they differ, what to check yourself, and a bottom line. Free accounts work. iPhone via Apple Shortcuts; the code is open on GitHub. On Android, Poly Duo is in the Poly app on Google Play, with free AIs from other companies.
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For the first time, your own ChatGPT and Claude apps work together on your phone — one tap, free.
I'm Vadym, the maker of Poly Duo. Any AI can sound sure and still be wrong, and I kept copying answers between ChatGPT and Claude to check them. Poly Duo does that in one tap: both answer blind, without seeing each other, then Claude compares the two. You get where they agree, where they differ, what to check yourself, and a short bottom line.
In a test on 26 October, GPT-6.1 Sol and Claude Opus 5.5 agreed on 74 of 100 fresh questions and were right on 72 of those. The other 26 are where a second look matters most.
The code is open (Apache 2.0): https://github.com/vadimchernets.... Two of my papers on AI verification were accepted as posters at NeurIPS 2026 workshops. If you want to try it: https://polyhelper.ai/duo/?ref=producthunt
Where do you double-check AI most, and what would you want the bottom line to say?
Vadym Chernets, AI researcher (NeurIPS 2026)