Second Brain vs CellNotes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Second Brain
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Second Brain is your offline-first personal knowledge management app. Capture every idea, note, and insight — and never lose a thought again. No ads. No tracking. No account required. Your data stays on your device. FEATURES: • Rich Notes — Write with Markdown support, add images, link notes together • Collections — Organize notes into collections with icons and colors • Tags — Tag anything for instant filtering • Daily Notes — One note per day, automatically created • Goals — Track personal goals with milestones and progress • Book Notes — Capture key takeaways from books you read • Quotes — Save your favorite quotes • Knowledge Graph — See how your ideas connect visually • Bi-directional Links — Link notes and see backlinks automatically • Full-Text Search — Find anything instantly • Favorites & Archive — Star important notes, archive the rest • Quick Capture — Capture thoughts from the home screen widget • Face ID / Touch ID — Lock your app for privacy • iCloud Backup — Optional, off by default • Export — PDF, CSV, Markdown • 15 Languages — English, Turkish, Spanish, German, French, Italian, Portuguese, Dutch, Polish, Arabic, Japanese, Korean, Chinese, Russian PRIVACY FIRST: Second Brain collects zero data. No analytics, no tracking SDKs, no servers. Everything lives on your device. PREMIUM (one-time purchase): Unlock unlimited notes, collections, Knowledge Graph, exports, Face ID, and home screen widgets with a single lifetime purchase.
CellNotes
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メモみたいに軽い、シンプルなスプレッドシート。 CellNotes は「表は欲しいけど、本格的な表計算アプリは大げさ」を解決します。 メモアプリのように軽く開けて、ちょっとした集計までこなせます。 家計簿、買い物リスト、点数の記録、出張費の概算。 「表でメモを取りたい」その場面の、第一選択へ。 ■ できること ・表形式のノートをすぐ作成・編集 ・列ごとに型を設定(テキスト/数値/計算) ・数値列の合計、列同士の計算式 ・行のチェックで消し込み(タスクモード) ・アーカイブと復元(うっかり削除を防ぐ論理削除) ■ CellNotes が「やらない」こと 軽さを守るために、あえて持たない機能があります。 ・多人数での共有・同時編集はしません(個人ツールに特化) ・VLOOKUP や IF などの複雑な関数はありません(合計・平均などの基本集計のみ) ・シート切り替えやセル参照式はありません(1ノート=1つの表) ■ データはすべて端末の中 通信は行いません。あなたのノートは端末内にだけ保存されます。 アカウント登録も不要。開いてすぐ書けます。 ```
Screenshots
Verdict
The clearest difference is in-app purchases: CellNotes at none against Second Brain's 1. CellNotes also leads on update cadence (every 3 weeks vs every 3 months). On price, ads, device support and iOS requirement 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 sells 1 one-off in-app purchase. CellNotes asks for nothing beyond the download.
Second Brain ships an update every 3 months, CellNotes every 3 weeks. The most recent releases landed on October 1, 2026 and September 20, 2026 respectively.
| Parameter | Second Brain | CellNotes |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 25 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Selahattin Bozat | Takafumi Terasaki |
In-app purchases
Second Brain
- Second Brain Premium$9.99
CellNotes
No in-app purchases









