Comparison

Second Brain vs CellNotes

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

Head to head
About

Second Brain

Features
Read full description

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.

About

CellNotes

Features
Read full description

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

Second Brain4 screens
CellNotes4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Second Brain sells 1 one-off in-app purchase. CellNotes asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 4 level
Second Brain versus CellNotes: the parameters behind the verdict, then further details
ParameterSecond BrainCellNotes
PriceFreeFree
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size25 MB31 MB
Age rating4+4+
DeveloperSelahattin BozatTakafumi Terasaki

In-app purchases

1 purchases

Second Brain

One-time1
  • Second Brain Premium$9.99
None

CellNotes

No in-app purchases

Questions

Is Second Brain free?
Second Brain is free to download, with in-app purchases available.
Is CellNotes free?
CellNotes is free to download, with no in-app purchases.
Do Second Brain or CellNotes have ads?
Neither Second Brain nor CellNotes shows ads.
Which is updated more often, Second Brain or CellNotes?
Second Brain ships an update every 3 months, and CellNotes every 3 weeks. Most recently, Second Brain was updated on October 1, 2026 and CellNotes on September 20, 2026.

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