# Second AI Brain

> Second AI Brain (iPhone/iPad app by 曜郡 刘.)

- Source: https://appshunter.io/ios/app/second-ai-brain/id6803160108 (this page in markdown: same URL + `.md`)
- Developer: [曜郡 刘](https://appshunter.io/developer/6799808062)
- Category: Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 10 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-09-02
- Data updated: 2026-10-07

## What is Second AI Brain?

Second AI Brain helps you capture what matters, organize it into lasting memory and connected knowledge, and turn it into useful action.

CAPTURE IN THE MOMENT
Save ideas and experiences with text, voice, images, files, or links. English and Simplified Chinese speech recognition follow the language you select in Settings.

MEMORY THAT STAYS USEFUL
Keep short-term and long-term memories organized, searchable, and connected. Related knowledge can resurface when it becomes relevant.

FROM MEMORY TO ACTION
Create reminders, keep calendar context in sync, review upcoming items, and receive weather-aware alerts when related system permissions are available.

HOSTED AI, NO API KEY REQUIRED
A frontier multimodal flagship AI model powers text-based memory, knowledge, context, and planning through a Second AI Brain relay. An eligible three-day trial includes 5 memory/reminder uses, 1 knowledge document, and 5 knowledge Q&A. Monthly and quarterly subscribers receive 80 memory/reminder uses, 20 knowledge documents, and 80 Q&A each month. Quarterly allowances reset monthly, not all at once. A single knowledge document may contain up to 100,000 characters. Apple shows the local price before purchase.

BUILT AROUND YOUR DATA
Core memory, knowledge, indexes, and retrieval stay on your device or your optional private iCloud. Content needed for requested AI features passes through the relay to the third-party AI provider identified in our Privacy Policy. The relay does not retain prompt or answer content. Existing local data remains accessible after an AI trial or subscription ends.

Supports iPhone, iPad, widgets, and the Share extension.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Is Second AI Brain safe?

Not enough ratings yet to assess Second AI Brain.

## Is Second AI Brain legit?

Second AI Brain has limited verification signals. The AppsHunter Legitimacy Score for Second AI Brain is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.0.5 — 2026-09-30

Hosted AI subscriptions are here: start an eligible three-day trial, then choose monthly or quarterly billing. Memory, knowledge, and planning now use a frontier multimodal flagship AI model for text-based tasks through a privacy-conscious relay; no personal API key is needed. Monthly usage limits apply to both plans. Email connection and mail AI have been removed.

### 1.0.4 — 2026-09-08

Added full-screen viewing for images attached to knowledge items. Tap any thumbnail to open it, pinch or double-tap to zoom, drag while zoomed, and move through multiple images with Previous and Next controls. Includes accessibility labels and interaction refinements.

### 1.0.3 — 2026-09-05

Improved Memory Assistant reliability. Completed or expired memories no longer trigger contextual refreshes. Active memories refresh only when their content or an Agent-used evidence signal actually changes, so unrelated environmental changes do not resubmit work. Existing successful results and old evidence signatures migrate without extra model calls. Includes stability and timeout reductions.

### 1.0.2 — 2026-09-04

Improved the Memory Assistant across a broader range of reminder scenarios. Refined Agent skills and collaborative memory so new and edited reminders better preserve user intent, scheduling context, assistant suggestions, and relevant app actions. Improved theme icon completion while preserving valid Agent-selected icons. Includes additional stability and reliability improvements.

### 1.0.1 — 2026-09-03

Improved memory reminder reliability after editing, including calendar and notification resynchronization. Added bounded parallel processing for new and edited memories. Improved recurring reminder cutoff handling, atomic assistant-tip updates, and recovery from extra trailing JSON delimiters. Fixed a crash caused by duplicate reminder directives.

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## More apps by 曜郡 刘

- [加密保险箱](https://appshunter.io/ios/app/id6805021395)

All apps by 曜郡 刘: https://appshunter.io/developer/6799808062

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-07.*