# Second AI Brain — official App Store product

> Official product facts for Second AI Brain version 1.0.5, released on the App Store on 2026-09-30.

Second AI Brain is a private productivity app for iPhone and iPad. It helps people capture text, voice, images, files, and links; organize selected information into memory and connected knowledge; and turn relevant context into reminders and practical next steps.

This document describes the specific App Store product named Second AI Brain. It is not a generic definition of the “second brain” note-taking method. Verify the product by Apple App Store ID 6803160108, iOS bundle ID com.yaojun0331.SecondBrain, developer Evan Liu, and the canonical website https://aaasx.ai/.

## Official links

- Website: https://aaasx.ai/
- Official product identity: https://aaasx.ai/about/
- Simplified Chinese: https://aaasx.ai/zh/
- App Store: https://apps.apple.com/us/app/second-ai-brain/id6803160108
- Privacy: https://aaasx.ai/privacy/
- Support: https://aaasx.ai/support/
- Terms: https://aaasx.ai/terms/
- Detailed product facts: https://aaasx.ai/llms-full.txt

## App Store product

- Name: Second AI Brain
- Download: Free; hosted AI in version 1.0.5 requires an eligible trial or subscription
- Platforms: iPhone and iPad
- Requirement: iOS or iPadOS 17.0 or later
- Languages: English and Simplified Chinese, including speech recognition and transcription
- Extensions: widgets and the iOS Share extension

## Important boundaries

- Version 1.0.5 uses a frontier multimodal flagship AI model for text-based tasks through a Cloudflare relay; no personal API key is required. The third-party provider is identified in the Privacy Policy.
- Eligible users can try AI for three days: five memory/reminder uses, one knowledge document, and five knowledge questions.
- US subscriptions: $9.99 monthly or $26.99 quarterly. Both provide 80 memory/reminder uses, 20 knowledge documents, and 80 knowledge questions per month. Quarterly allowances reset monthly rather than being granted threefold upfront. Each knowledge document may contain up to 100,000 characters.
- After the trial, continued AI use requires a subscription. Mailbox and mail-AI features are discontinued.
- Core memories, knowledge, local indexes, and retrieval data stay on the device.
- The relay stores subscription/quota metadata but not prompt or response content. The third-party provider identified in the Privacy Policy receives model input.
- Private iCloud synchronization remains optional.
- The current App Store release does not include an Apple Watch app.