Arco
A macOS app for comparing multiple AI models privately with one prompt.
FreemiumChatbots & Assistants
Visit website Free to browse · updated 2026-06-30
What is Arco?
Users can broadcast a single query across selected models and view responses in customizable grid layouts. An integrated summarization tool analyzes agreements and differences to highlight stronger answers. The application supports developers debugging code, writers refining drafts, and researchers validating information by drawing on diverse model perspectives. Pricing options include a free tier with limited saved chats along with paid licenses for expanded storage and lifetime access. Data never leaves the device and billing occurs directly through the OpenRouter service based on token usage.
Key features
Compare 400+ AI models side by side via OpenRouter
Broadcast one prompt to all models simultaneously
Fully private with all data stored locally on device
AI-powered structured summary and comparison
Flexible 1-4 column layouts
Pay only OpenRouter per-token rates, no subscription
What you can use Arco for
Developers
Debug code, compare architecture advice, and evaluate API design suggestions from multiple models at once.
Writers
Generate multiple drafts, compare tone and style, and pick the version that fits your voice.
Researchers
Cross-check summaries, surface different perspectives on a topic, and validate sources across models.
How to use Arco
- 1Sign up at openrouter.ai for an API key
- 2Choose models from the 400+ available
- 3Type your question in the input field
- 4Broadcast the prompt to all selected models
- 5Review responses and generate an AI summary
Arco pricing
Pricing model: Freemium. Plan details are indicative — check the site for current prices.
FOREVER Free
Free
- Compare from 400+ AI models
- Up to 3 saved conversations
- Your data stays on your device
PRO
Popular$29/yr
- Compare from 400+ AI models
- Unlimited saved conversations
- Your data stays on your device
- One payment, no recurring charges
- Free updates included
- Works on 1 Device
UNLIMITED
$49one-time
- Compare from 400+ AI models
- Unlimited saved conversations
- Your data stays on your device
- One payment, lifetime access
- Free updates, forever
- Works on 1 Device
Editor's verdict
Pros
- +Strong privacy with local storage
- +Wide model selection through single API key
- +No recurring subscription fees
Cons
- –macOS only (Apple Silicon required)
- –Requires separate OpenRouter API key and usage payments
- –Free tier limited to 3 saved conversations
Our take: Arco is a solid chatbots & assistants choice. It's valued for strong privacy with local storage and wide model selection through single api key. The main trade-off is macos only (apple silicon required). A good pick if you want capable AI without a high upfront cost.
Frequently asked questions
Arco is a native macOS app that lets users compare 400+ AI models side by side via OpenRouter while keeping all data stored locally on the device.
Summary
Arco is a solid chatbots & assistants choice. It's valued for strong privacy with local storage and wide model selection through single api key. The main trade-off is macos only (apple silicon required). A good pick if you want capable AI without a high upfront cost.
Did you find this helpful?
User reviews
Verified reviews from the community shape this tool's rating.
Loading reviews…
Arco alternatives
Similar chatbots & assistants tools worth comparing.
