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Second Brain - Know Yourself

Second Brain - Know Yourself

Weekly self-insight, no diary

2 ratings
1 review
🌟 Lifestyle
📊 Productivity
Free
In-App Purchases

Details

  • Released
  • Updated
  • March 16, 2026
  • October 8, 2026

Features

Developer

Liwei Xie
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Second Brain - Know Yourself screenshot #1 for iPhone
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Second Brain - Know Yourself screenshot #8 for iPhone
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About

This AI-powered journal captures your thoughts via voice or text, automatically organizing and connecting them. It helps you recall memories, discover patterns, and reflect on your growth.

✓AI classification, tagging, and summarization
✓Semantic search by meaning
✓Three-layer memory system
✓People cards for relationship tracking
✓Weekly AI reflections
✓Voice input with transcription
✓Data export (JSON + Markdown)
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What's New in Second Brain

1.7.2

October 8, 2026

• With On-Device AI turned on, or when you're offline, dates and times in your notes are now picked up on the phone. "Dentist next Friday at 3pm" still becomes a reminder and a to-do, without anything being sent. • AI results now show where they were made: "On device" or "Cloud AI". You'll see it on your notes, in Explore answers and on reflections. • Notes you save offline are marked "Offline" and get a proper title and tags once you're back online. If On-Device AI is on, this doesn't happen and the notes stay on your phone.

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Subscriptions & In-App Purchases

Second Brain Pro

Save 33% — all Pro features, billed annually

$39.991 Year
7 Days trial
How to cancel Second Brain subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Fantastic

This is exactly what i needed. i love using this app, BUT the icloud sync across iphone and macbook does not seem to work. As I use it i feel that I’ll think of some improvements since id be using it every day, but this is a game changer for me
TlrvsqsTlrvsqs

Response from developer

Thanks! You were right, iCloud sync was broken. It's fixed now, so update to the latest version and it should sync between your devices. If it still doesn't, email me at info@smartkiitos.com. I'd also like to hear those improvements when you have them.

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FAQ

What is Second Brain?

Second Brain is an AI-powered journal that helps you capture, organize, and recall your thoughts and memories. It uses AI to classify, connect, and summarize your entries, making them easily searchable by meaning.

Does Second Brain have ads?

Second Brain is ad-free. The core features are available for free with daily limits, and an optional Pro subscription unlocks advanced features without any advertisements.

How does Second Brain organize memories?

Second Brain organizes memories into three layers: instant thoughts, short-term plans, and long-term knowledge. The AI then automatically classifies, tags, and summarizes each memory, creating a knowledge graph of connections.

Can I use Second Brain offline?

Yes, core features of Second Brain work offline. This means you can capture and access your memories even without an internet connection, ensuring your data is always available.

What are the subscription options for Second Brain?

Second Brain offers a Pro subscription with daily limits on explorations and reflections. Pro users get unlimited captures, people cards, OCR, iCloud sync, data export, and access to the memory connection graph and theme discovery clusters.

How often is Second Brain updated?

The latest version of Second Brain is 1.5.1, last updated on July 7, 2026. Updates typically include new features, performance improvements, and bug fixes to enhance user experience.

Is my data safe with Second Brain?

Second Brain prioritizes privacy with data stored locally on your device. AI processing uses the Anthropic Claude API, and your data is not shared with any third parties. Optional iCloud sync uses your personal Apple account.

What devices does Second Brain support?

Second Brain is currently supported on iPhones. iCloud sync allows for seamless data access across your Apple devices if you choose to enable it.