Poly Duo
iPhone Shortcut that chains the official Ask ChatGPT and Ask Claude app actions, so one model answers and the other reviews it, on the user's own accounts with no server or API keys; the Android counterpart is a separate app with its own key path and does not use the Shortcut's actions. Apache-2.0 licensed.
An iPhone Shortcut that chains the official Ask ChatGPT and Ask Claude actions so one model answers and the other reviews it, free.
What it is
Poly Duo is a signed Apple Shortcut for iPhone running iOS 18 or later. It calls the Ask ChatGPT action, then the Ask Claude action, so one model's answer gets checked by the other. The work happens between your own installed apps, on the accounts you already have, with no server run by the project and no API keys to manage. The README describes the result as a single checked answer shown on screen and copied to the clipboard, usually within about a minute. The project is licensed under Apache-2.0, and an Android counterpart exists as a separate app that does not use this Shortcut's actions.
Key features
- Chains the Ask ChatGPT and Ask Claude actions published by the apps themselves
- Runs on your own accounts without API keys or a project-operated server
- Copies the checked answer to the clipboard and writes a journal file
- Offers a Trio variant that adds a third voice
- Ships signed files in multiple languages, with a source build option
- Apache-2.0 licensed source on GitHub
Use cases
- Getting a second opinion on a factual question before relying on it
- Checking a draft answer from one assistant against another
- Running a quick comparison from your phone without opening a computer
Who it's for
iPhone users who already have the ChatGPT and Claude apps and want a second opinion without extra subscriptions or setup. Android users should look at the separate Android app instead.
Getting started
The README gives an install path rather than terminal commands. On iPhone, install the free ChatGPT and Claude apps, sign in to both, then add the Duo shortcut from the iCloud link for your language, or open the signed file in the releases folder and tap Add. On first run, tap Always Allow when prompted for ChatGPT, Claude, and clipboard access. Keep the phone in hand and avoid touching the screen during a run, since touches stop it. The README also notes that building from source requires macOS and Python 3.9+.
Alternatives
Related directory entries include AI Language Partner, Cherry Studio, ChatALL, and Panelize. These are listed only as related names; this description does not establish how they compare.
Drafted with AI from the project's public documentation; verify against the source. Written 1 Nov 2026.