Comparison

9uicknote vs Second Brain Vault

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

9uicknote

Features
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9uicknote is a lightweight note app built for speed. Open it, start writing, and let the app handle saving and syncing in the background. It keeps the writing experience direct, calm, and focused, so your thoughts can keep moving. What you can do: - Create and edit Markdown notes. - Save automatically as you write. - Sync notes with the same account across mobile and web. - Search, sort, and filter your notes. - Keep notes private by default. - Publish selected notes and copy a public link. - Customize language, theme, background, font size, and line height. - Use Focus mode and Meditation mode on supported plans. 9uicknote is for quick capture, daily writing, rough drafts, checklists, ideas, and notes you want to keep close without opening a heavy workspace. Terms of Use: https://retrock.jp/terms

About

Second Brain Vault

Features
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Second Brain Vault isn't another folder-organizing app. You just save β€” the on-device AI files it for you and finds it back later when you ask in plain language. A private memory vault that lives entirely on your iPhone. We're all good at saving. The real question was always "where did I put that?" Second Brain Vault flips the order: you save, the AI organizes and recalls. HOW IT WORKS β€’ Save in one tap β€” a note, a photo, a voice memo, a PDF, or a web link. Anything, instantly, into your vault. β€’ AI organizes it for you β€” every saved item gets a title, a summary, a category, and tags, automatically. Photos are read with OCR, voice is transcribed, PDFs and links have their text extracted. β€’ Recall like a person β€” ask "that real-estate article I read last year," "the best cold-noodle place I saved," "the app idea I jotted last month," and it finds the right memory. It's hybrid retrieval β€” semantic meaning plus keywords plus recency β€” so it works even when you don't remember the exact words. β€’ It grows with you β€” Insights show your top topics and saving trends, and every week the AI writes a short Retrospective of what you saved. The more you save, the higher your Brain Level. WHAT'S INSIDE β€’ Home β€” today's and recent items, plus a one-line AI insight β€’ Quick capture β€” five kinds: note, photo, audio, PDF, link β€’ Natural-language Recall β€” hybrid semantic + keyword + recency ranking β€’ Insights β€” top topics, save volume, Brain Level growth β€’ Weekly Retrospective β€” an AI recap of your week of memories β€’ Automatic categories & tags β€” organized without you filing anything PRIVACY BY CONSTRUCTION Everything is processed on this iPhone. Because it uses Apple's on-device AI (Foundation Models), your notes, photos, voice and documents never leave the device. No account, no server, no ads, no tracking. The only time it uses the internet is to fetch the page of a web link you choose to save. APPLE INTELLIGENCE REQUIRED Auto-organizing, natural-language search, Insights and the Retrospective run on Apple-Intelligence-capable devices. On other devices you can still save and search by keyword; the AI features show an "Apple Intelligence required" state. START FREE, UNLOCK WHEN YOU NEED IT Free: up to 100 items, full on-device AI organizing & search on all 100, every capture type, Insights and Brain Level included. Pro (β‚©6,600 / year): unlimited saves, iCloud backup & sync, weekly Retrospective history, and more. Lifetime (β‚©29,000, one-time): everything in Pro, forever, no renewal. You save it; Second Brain Vault remembers it. Drop in your first memory today. β–  Device requirements AI auto-organizing and semantic (meaning-based) search require an Apple Intelligence–capable device β€” iPhone 15 Pro / 15 Pro Max and iPhone 16/17 or later, iOS 26 or later. On other devices, saving and keyword search still work fully. Everything is processed on-device; nothing is ever sent off your iPhone. β–  Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://blue-code.github.io/legal/second-brain-vault/privacy.en.html

Screenshots

9uicknote4 screens
Second Brain Vault4 screens

Verdict

The call

The clearest difference is device support: 9uicknote at 3 against Second Brain Vault's 1. 9uicknote also leads on iOS requirement (15.0 vs 26.0). On price, ads and in-app purchases there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. 9uicknote sells 2 in-app purchases, starting at $1.99 per month and Second Brain Vault sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard2 real differences Β· 3 level
9uicknote versus Second Brain Vault: the parameters behind the verdict, then further details
Parameter9uicknoteSecond Brain Vault
PriceFreeFree
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS15.0 β€” better26.0
Further details β€” not scored
Size41 MB2 MB
Age rating4+4+
DeveloperRetrock Inc.Byoungho Kim

In-app purchases

2 purchases

9uicknote

Subscriptions2
  • 9uicknote Plus$1.991 Month
  • 9uicknote Premium$3.991 Month
1 purchases

Second Brain Vault

One-time1
  • Second Brain Vault (Lifetime)$17.99

Questions

Is 9uicknote free?
9uicknote is free to download, with in-app purchases available.
Is Second Brain Vault free?
Second Brain Vault is free to download, with in-app purchases available.
Do 9uicknote or Second Brain Vault have ads?
Neither 9uicknote nor Second Brain Vault shows ads.

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