Second Brain Joiner
Merge Markdown notes for LLM
$3.99 · Designed for iPad. Not verified for macOS.
Also Included In
A professional-grade input optimization tool designed to push your AI's potential to the absolute limit.
"Second Brain Joiner" is an application that seamlessly formats and merges your vast collection of Markdown files (your "Second Brain") stored on your device into a single context that AI can easily understand.
While modern AI possesses incredible reasoning abilities, it doesn't know your "past context." However, blindly feeding it all your files isn't the solution either. If the amount of information exceeds the context window (the AI's memory limit), the AI becomes confused and generates "hallucinations" (plausible lies).
This app was designed to solve that exact problem flawlessly.
[Core Features & The Value of the PRO Spec]
◆ 1. Advanced Filtering (Enhancing Context Purity)
You no longer need to give the AI "all your memories." By specifying tags or modification dates, you can smartly extract only the context relevant to the problem you want to solve right now. Eliminate noise and deliver 100% pure knowledge to your AI.
◆ 2. High-Precision Token Calculation & Smart Chunking
Automatically splits (chunks) files into optimal sizes tailored to your AI's limits. Through highly accurate token estimation, even a massive vault with thousands of files can be processed without errors, dramatically improving the accuracy of your AI's responses.
◆ 3. Local-First Absolute Security
Your thoughts belong to you alone. This app does not send data to external cloud servers; all merging and splitting processes are completed entirely within your device's local environment. You can securely process highly confidential business documents or personal diaries.
◆ 4. Folder Structure Maintenance & Timestamping
It doesn't just connect text. It automatically inserts the original folder path and last modified date at the beginning of each file. This allows the AI to accurately grasp the timeline and hierarchical structure—"what project this is and when it was written"—before making advanced inferences.
[Recommended for:]
Prompt engineers and researchers who structure their daily knowledge using Markdown.
Those who want to feed their past notes to AI to create a dedicated brainstorming and strategic partner.
Those who demand the highest possible accuracy and minimal hallucinations from AI responses.
Turn your "Second Brain" into the ultimate engine for your AI.
Experience the breakthrough in intellectual productivity brought to you by H.I. MET ARCHITECT.
Ratings & Reviews
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Performance and stability improvements
The developer, Hirofumi Inoue, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Hirofumi Inoue
- Size
- 12 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.2 or later.
- iPhone
Requires iOS 18.2 or later. - iPad
Requires iPadOS 18.2 or later. - Mac
Requires macOS 15.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.2 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 H.I. MET Architect
