# 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 from October 6, 2026: $4.99 monthly or $13.49 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. The App Store shows actual local prices.
- 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.