メモモモモ vs Second Brain Vault
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
メモモモモ
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メモモモモは、グループごとにメモを保存できるメモアプリです。 メモグループを作成して、メモを作成します。 グループごとに色を設定したり、文字サイズ等の細かい設定もできます。 【メモの検索】 全てのメモの中から、キーワードで検索することができます。 【メモの統合】 同じグループのメモを一つにまとめることができます。 【メモの分割】 一つのメモを複数のメモに分割することができます。 手順は以下の通り ①メモ中の分割したい箇所にカーソルを移動 ②キーボード上部のハサミボタンを押下(分割用の文字が入ります) ③右上の『分割』ボタンを押下 ④ポップアップ画面が出るので、問題なければOKボタン押下。
Second Brain Vault
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Second Brain Vault isn't another folder-organizing app. You just save — 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 • Save in one tap — a note, a photo, a voice memo, a PDF, or a web link. Anything, instantly, into your vault. • AI organizes it for you — 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. • Recall like a person — 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 — semantic meaning plus keywords plus recency — so it works even when you don't remember the exact words. • It grows with you — 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 • Home — today's and recent items, plus a one-line AI insight • Quick capture — five kinds: note, photo, audio, PDF, link • Natural-language Recall — hybrid semantic + keyword + recency ranking • Insights — top topics, save volume, Brain Level growth • Weekly Retrospective — an AI recap of your week of memories • Automatic categories & tags — 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 (₩6,600 / year): unlimited saves, iCloud backup & sync, weekly Retrospective history, and more. Lifetime (₩29,000, one-time): everything in Pro, forever, no renewal. You save it; Second Brain Vault remembers it. Drop in your first memory today. ■ Device requirements AI auto-organizing and semantic (meaning-based) search require an Apple Intelligence–capable device — 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. ■ 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
Verdict
The clearest difference is in-app purchases: メモモモモ at none against Second Brain Vault's 1. メモモモモ also leads on iOS requirement (14.2 vs 26.0). Second Brain Vault's advantage is ads (none vs shown). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Second Brain Vault sells 1 one-off in-app purchase. メモモモモ asks for nothing beyond the download.
| Parameter | メモモモモ | Second Brain Vault |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 92.9% of reviews | — |
| Update frequency | Every 2 months | — |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 14.2 — better | 26.0 |
| Further details — not scored | ||
| Size | 18 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Hiroki Sato | Byoungho Kim |
In-app purchases
メモモモモ
No in-app purchases
Second Brain Vault
- Second Brain Vault (Lifetime)$17.99







