01
Save the thought before it disappears.
Speak, type, add an image, select a file, or share a link. Capture in English or Simplified Chinese without changing how you think.
Available now on the App Store
Second AI Brain. Turn what you capture into what you can use.
Second AI Brain helps you save ideas and experiences, organize them into lasting memory and connected knowledge, and move from remembering to useful action.
- Version 1.0.5 available · free download, subscription for AI
- iOS & iPadOS 17+
- English & 简体中文
MemoryKeep what matters
ActionKnow what comes next
VoiceTextImagesFilesLinksShare extension
One connected flow
Capture naturally. Organize privately. Act with context.
Second AI Brain is designed around the path from a fleeting thought to something useful—not another inbox you have to maintain.
02
Turn scattered inputs into living knowledge.
Keep memory and knowledge distinct, searchable, and connected so the right context can resurface later.
03
Move from “remember this” to “what is next.”
Reminders, calendar context, and the personal assistant help relevant information become a practical next step.
Hosted AI · version 1.0.5
One managed model. Clear limits.
In version 1.0.5, a frontier multimodal flagship AI model powers text-based memory, knowledge, context, and planning through the Second AI Brain relay. No personal API key or model setup is needed.
Memory & Knowledge
Organizes what you choose to keep.
Structures memory and knowledge, maintains long-term context, and supports personalization.
Context & Planning
Helps decide what matters now.
Evaluates situational relevance and prepares project context and plans.
Version 1.0.5 offers eligible users a three-day trial: five memory/reminder uses, one knowledge document, and five knowledge questions. After the trial, AI requires a subscription. US prices are $9.99 monthly or $26.99 quarterly; both plans include 80 memory/reminder uses, 20 knowledge documents, and 80 knowledge questions per month. Quarterly allowances reset monthly. Local prices and availability are shown in the App Store. The relay does not store prompt or response content; see the Privacy Policy for the provider processing boundary.
Private by design
Your second brain stays yours.
Core memories, knowledge, indexes, and retrieval stay on your device. AI requests pass through a Cloudflare relay to the third-party provider identified in our Privacy Policy; the relay keeps quota metadata, not prompt or response content. Other permissions remain under your control.
Read the privacy policyOn-device core
Your primary memory and knowledge system lives inside the App.
Optional private iCloud sync
Enable synchronization only when you want your selected data across devices.
Permission-controlled context
Calendar, weather, location, speech, and other system capabilities remain subject to Apple permissions.
Designed for Apple platforms
With you when ideas appear.
Direct answers
Frequently asked questions.
What is Second AI Brain?
Second AI Brain is the official name of Evan Liu's iPhone and iPad productivity app (Apple App Store ID 6803160108). It captures thoughts and experiences, organizes them into memory and connected knowledge, and turns relevant information into reminders and practical next steps. It is a specific App Store product, not the generic “second brain” note-taking method.
Which website is the official Second AI Brain website?
aaasx.ai/ is the official product website. The matching official App Store listing is identified by Apple App Store ID 6803160108 and developer Evan Liu.
How is it different from a notes app?
A notes app primarily stores documents. Second AI Brain keeps memory, knowledge, reminders, and situational context distinct but connected, so information can be retrieved and used when it becomes relevant.
What can I capture?
You can capture text, voice, images, files, and links. English and Simplified Chinese speech recognition and transcription follow the language selected in the app.
How does AI access work?
The hosted-AI update provides a frontier multimodal flagship AI model for text-based tasks through a Cloudflare relay, with no personal API key to configure. Eligible users can start a three-day limited trial; continued AI use requires a monthly or quarterly subscription. Mailbox connection and mail AI features are discontinued.
Where is my data stored?
Core memories, knowledge, local indexes, and retrieval data stay on your device. The relay processes requested AI content in memory and stores only subscription/quota metadata; the third-party provider identified in our Privacy Policy receives the model input. Private iCloud synchronization remains optional.
Which devices are supported?
The current App Store version supports iPhone and iPad, plus widgets and the iOS Share extension. It requires iOS or iPadOS 17.0 or later.
Second AI Brain · Version 1.0.5
Give your thoughts somewhere to grow.
Free download on the App Store; hosted AI requires an eligible trial or subscription.
Download on theApp Store