Poly Duo (C1M)
ChatGPT answers, Claude checks — one tap on iPhone
FreeAIWorkflow automationOther6 impressionslaunches Oct 271 comment
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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
C1M Duo is a free iPhone shortcut that runs ChatGPT and Claude on-device, letting one answer and the other verify it.
- 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 then Claude on the phone and returns a single combined answer.
- 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 (C1M) vs alternatives
 Poly Duo (C1M) |  n8n |  Zapier |  Activepieces |  Jira | |
|---|---|---|---|---|---|
| Best for | On-device dual-AI verification | 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 (C1M) vs n8n: General workflow automation platform, not focused on on-device dual AI checks.
- Poly Duo (C1M) vs Zapier: No-code integration tool for web apps; requires internet services, unlike Duo's local phone execution.
- Poly Duo (C1M) vs Activepieces: Open-source automation similar to Zapier, but does not provide AI answer verification on mobile.
- Poly Duo (C1M) vs Jira: Issue tracking system; unrelated to AI shortcut functionality.
Poly Duo (C1M) 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.
Summarized by DevHunt from polyhelper.ai · Oct 25, 2026. Details may change; check the official site.
