Poly Duo

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, and checking by hand means copying the question into a second app and comparing two walls of text.

Poly Duo does it in one tap. ChatGPT answers, Claude answers on its own without seeing the first answer, then the two answers are compared. In about a minute — via Action Button, Siri or Back Tap — you get three blocks: where they agree, where they differ, and what is worth checking yourself.

It is an iPhone shortcut (iOS 18+) built on the official actions of the ChatGPT and Claude apps, so free accounts are enough. The question goes straight to your own apps. Anyone can read the code on GitHub: https://github.com/vadimchernets/poly-duo. There is also a separate free Poly app for Android on Google Play.

Why it is new: on computers, tools for asking several models at once existed, mostly as browser extensions and paid hubs. On a phone, going straight to your own apps with nothing in between, there was nothing like it.

The number that made me build it: I asked both models 100 new, unpublished questions. On 74 they agreed independently — and were right 72 times. On the other 26 they disagreed, and that is exactly where a human should look (October 2026, GPT-6.1 Sol and Claude Opus 5.5).

I can send an 18-second demo or screenshots for the listing. Install in one tap, video and research: https://polyhelper.ai/duo/?ref=us-spacerrapps

Vadym Chernets, AI researcher — my research was accepted at NeurIPS 2026. info@polyhelper.ai