Comparison

Log vs Deep Dive

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

Head to head
About

Log

Features
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Log is a thought log for people who turn ideas into reality. Capture an idea in one line. Not a record, but a log for evolution. You wrote it down, then lost track of it. Ideas pile up, but you can't tell what moved forward and what stalled. Log keeps your thinking not as scattered dots, but as a history of change. CAPTURE IN ONE LINE Save a thought before it fades, with the fewest taps. Organize later. Type #tags in the title and they are added automatically. CONNECT YOUR THINKING Link related logs and keep a thought history (v1 → v2 → v3), so you always know where an idea came from and where it went. DIG DEEPER WITH AI Chat with Claude, ChatGPT or Gemini about one log or a bundle of logs. Save a good reply back as a new log with one long-press. AI ideas suggests three next steps: dig deeper, branch out, or move to the next stage. SIX LAYERS OF THINKING Idea → Output → Build → Launch → Review → Reach. Give each log a layer and see how far each thought has grown. SPIRAL GRAPH™ See the density, depth and reach of your thinking on Log's own logarithmic spiral. Tap a layer to open its logs. WRITE MATH Wrap text in $ to show it as math, in your notes and in AI replies. Great for math and physics study logs. EXPORT AS MARKDOWN Export a whole folder as a ZIP of Markdown files, one note per log, ready for Obsidian and other apps. Back up and restore everything with JSON. PRIVATE BY DESIGN Your logs stay on your device. Log has no server and never uses your logs for training. Lock the app with Face ID. AI features use your own API key, stored in the iOS Keychain and sent only to the AI provider you choose. PRICING Free: up to 3 folders and 50 logs, with every feature. Pro: unlimited folders and logs. One-time purchase, no subscription.

About

Deep Dive

Features
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集中した時間の長さが、そのまま潜水艦の到達深度になります。 25分の集中で水深450m。90分なら1500m。深く潜るほど暗くなり、そこにしかいない深海生物と出会えます。集中を中断してアプリを離れると緊急浮上となり、その航海で捕らえた生物はすべて失われます。 実在の深海生物101種 マリアナ海溝の底に暮らすカイコウオオソコエビ、体長比で全魚類最大の牙を持つオニキンメ、鯨の骨だけを食べるホネクイハナムシ。すべて実在の生物で、それぞれに解説がついています。捕らえた生物は剥製として図鑑に収めるか、水槽で泳がせるか、港で売るかを選べます。 潜れる深さは、二つの要素で決まります コインで買える潜水艦の耐圧殻と、航海の回数だけで伸びる乗組員の胆力です。お金では買えない成長があります。海溝の最深部、チャレンジャー海淵の11,034mに到達するには、たくさんの航海が必要です。 集中のための音 低い環境音が途切れずに流れ、その上に泡の音がときどき乗ります。数分に一度、遠くで鯨が鳴きます。長時間かけっぱなしにする前提で設計してあり、耳が疲れる純音を含みません。周囲の物音を覆い隠す働きが期待できます。モノラルビートを含みますが、脳波への作用を主張するものではありません。 設定でオンオフが可能です。 ### そのほか - 5分から24時間まで、5分単位で設定できます - 電話や通知で一瞬離れても、90秒以内に戻れば航海は続きます - 潜った深さの累計を、東京スカイツリー何個分といった単位で表示します - 通信を行いません。データは端末内にのみ保存されます - 広告はありません --- 集中の深さを、水深で測る。

Screenshots

Log4 screens
Deep Dive4 screens

Verdict

The call

The clearest difference is in-app purchases: Deep Dive at none against Log's 1. Log's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 16.4). On price, update cadence and ads 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. Log sells 1 one-off in-app purchase. Deep Dive asks for nothing beyond the download.

UpkeepUpdate frequency

Log ships an update every 4 days, Deep Dive every 5 days. The most recent releases landed on November 5, 2026 and November 6, 2026 respectively.

Scorecard3 real differences · 3 level
Log versus Deep Dive: the parameters behind the verdict, then further details
ParameterLogDeep Dive
PriceFreeFree
Update frequencyEvery 4 days — betterEvery 5 days
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS13.0 — better16.4
Further details — not scored
Size40 MB34 MB
Age rating4+4+
Developermika masudaYUTO DOI

In-app purchases

1 purchases

Log

One-time1
  • Log Pro$5.99
None

Deep Dive

No in-app purchases

Questions

Is Log free?
Log is free to download, with in-app purchases available.
Is Deep Dive free?
Deep Dive is free to download, with no in-app purchases.
Do Log or Deep Dive have ads?
Neither Log nor Deep Dive shows ads.
Which is updated more often, Log or Deep Dive?
Log ships an update every 4 days, and Deep Dive every 5 days. Most recently, Log was updated on November 5, 2026 and Deep Dive on November 6, 2026.

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