Poly Duo
ChatGPT answers, Claude checks — one tap on iPhone
FreeAIWorkflow automationOther320 impressions#83 of its week3 comments
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>log in to commentC1M Duo turns one habit into one tap: ask ChatGPT, then have Claude check the answer. On iOS 18 both apps publish Shortcuts actions — Ask ChatGPT and Ask Claude. Duo chains them, so it runs on your own accounts: no server, no API keys, no proxy. Free accounts work; with Plus or Pro you get the strongest models of two companies working together at no extra cost. The result opens with where the two agree, where they differ and what to check yourself. Under the hood: one shortcut routes 12 modes, prompts are plain files in locales/, and tools/verify.py checks the signed shortcut against the sources. 11 languages, Apache-2.0. This has existed on computers. On a phone, free, with nothing in between — not until now. Which mode would you add next? — Vadym Chernets, independent AI researcher (PhD); two posters on AI evaluation and verification at NeurIPS 2026 workshops: https://neurips.cc/virtual/2026/178299 · https://neurips.cc/virtual/2026/loc/sydney/173020
Fatisco Stack Industries· 12d agoThe pitch says Claude checks ChatGPT's answer, but you also describe both answering blind — so is Claude actually reading what ChatGPT said before replying, or are the two answers only compared afterwards?
Good question, and the pitch line was a shortcut. The two answers are blind to each other: Claude gets the same question on its own and never sees what ChatGPT replied. Only after both are done does Claude see the two answers side by side and compare them, which gives the three blocks: where they agree, where they differ, and what to check yourself. So "Claude checks ChatGPT" means the comparison step, not that Claude reads ChatGPT's answer first. The shortcut is open source: github.com/vadimchernets/poly-duo
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First on a smartphone: ChatGPT and Claude answer one question together, one tap, free. Poly Duo (C1M) shows where they agree and differ. Open source: github.com/vadimchernets/poly-duo
- for
- Mobile developers and power users who want AI assistance directly on their phone.
- pricing
- free
- license
- Apache-2.0
Key features
- Dual AI workflow — Runs ChatGPT and Claude on the phone: each answers blind, then the answers are compared in one combined result.
- No server or API keys — All calls are made from the device using your own free accounts.
- Multi-language support — Works in 11 languages via the shortcut UI.
- 12 modes & debate — Includes debate mode that iterates until the AIs agree or highlight differences.
- Trio extension — Adds a third free AI to check both answers when needed.
- Open-source shortcut — Shortcut files are free, open source and installable via the Poly A1 app.
Use cases
- Quickly verify a ChatGPT answer on iPhone before copying it.
- Get a side-by-side comparison of two AI models for research or debugging.
- Run a multi-round debate to surface pros and cons of a decision.
- Use the Trio mode to add a third AI check when one model hits its limit.
Poly Duo vs alternatives
 Poly Duo |  n8n |  Zapier |  Activepieces |  Jira | |
|---|---|---|---|---|---|
| Best for | Seeing where ChatGPT and Claude agree and differ | Automation across cloud services | Cross-app automation | Self-hosted workflow automation | Project management |
| Pricing | Free | Subscription | Subscription | Free | Subscription |
| DevHunt upvotes | 1 | 0 | 0 | 0 | 0 |
| Launched | Oct 2026 | — | — | — | — |
- Poly Duo vs n8n: General workflow automation platform, not focused on comparing blind answers from two AIs.
- Poly Duo vs Zapier: No-code integration tool for web apps; does not compare blind answers from two AIs on your phone.
- Poly Duo vs Activepieces: Open-source automation similar to Zapier, but does not provide AI answer verification on mobile.
- Poly Duo vs Jira: Issue tracking system; unrelated to AI shortcut functionality.
Poly Duo FAQ
Do I need to pay for any service to use Duo?+
No, Duo runs on your free ChatGPT and Claude accounts; no subscription or server fees are required.
What devices are supported?+
Any iPhone with iOS 18+ and Android phones via the Poly A1 app.
Do I need to enter API keys?+
No, the shortcut uses the official Ask ChatGPT and Ask Claude actions from the installed apps.
Can I add a third AI for extra checking?+
Yes, the Trio shortcut adds a third free AI (NVIDIA, Groq, Google AI Studio, or OpenRouter) to the workflow.
What happens if one of the AIs runs out of free quota?+
You can switch to another free AI key or use the Trio mode, which tries multiple keys automatically.
Edited by the makers, based on polyhelper.ai · Oct 25, 2026. Details may change; check the official site.
