Underdog

★★★★☆4.0 / 5 editorial Free Free during invite-only beta; purchases made through the assistant may carry a small transaction fee — check the official site for current pricing.

Private AI assistant that runs entirely on your own computer.

✓ Editor-researched listing — details reviewed by Grab AI Tool editors; pricing re-checked regularly.

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#assistant#privacy#on-device#agents#local-ai

What is Underdog?

Underdog is a personal AI assistant from Conway Research that runs fully on your own device instead of in a cloud data center. It launched as an invite-only beta in October 2026 for Macs with Apple silicon, with other platforms planned, and is built around the idea that an assistant should be able to help with sensitive tasks without your private data leaving hardware you control.

It uses a 27-billion-parameter on-device model with Conway's Husky inference engine to handle everyday work like booking flights, reserving tables, ordering groceries, and canceling subscriptions — asking for approval before any purchase or cancellation. Email connects to Gmail and Outlook with credentials stored on the device, meeting notes are transcribed and summarized locally, and dictation works across apps.

Who Underdog Is Best For

Best for: Underdog is a strong fit for support, sales, and operations teams: Data stays on your device instead of being sent to a cloud AI service; free to use with no subscription and no ads by design. It is completely free, so there is no budget decision to make.

Not ideal for: Less suited to users who will hit its limits head-on: invite-only beta with limited platform support (Mac Apple silicon first, others coming); smaller on-device model than the largest cloud models.

Key Features

Fully on-device AI that runs locally on Mac (Apple silicon) in beta, so data stays on your computer
Browser errands including flights, tables, groceries, and subscription cancellations with approval first
On-device Gmail and Outlook email, local meeting transcription and summaries, and dictation in any app
AES-256-GCM vault with keys held in Apple Keychain and Secure Enclave, never leaving the device
On-device memories you can inspect, edit, or delete in Settings (invite-only beta, October 2026)

Pros

Data stays on your device instead of being sent to a cloud AI service
Free to use with no subscription and no ads by design
Practical everyday tasks, not just chat answers

Cons

Invite-only beta with limited platform support (Mac Apple silicon first, others coming)
Smaller on-device model than the largest cloud models
Transaction-fee business model is new and unproven at scale

Pricing

Model: Free
Free during invite-only beta; purchases made through the assistant may carry a small transaction fee — check the official site for current pricing.

Adding Up Your AI Bill?

If you pay for Underdog alongside other AI subscriptions, the monthly total adds up quietly. Tick every tool you pay for in our free AI Tool Cost Calculator to see your real monthly and yearly bill — and spot overlaps you can cut. Still choosing? Start with our guide on how to choose the right AI tool.