BathLog+ vs Caffeine mg
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
BathLog+
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毎日のお風呂、気づけば億劫になってしまうことはありませんか? BathLog+は、お風呂の記録をスマートに管理し、続ける力をサポートするために作られたシンプルで使いやすいトラッキングアプリです。忙しい日々の中でも、自分のペースで続けられることを大切にしています。 特徴: • 簡単記録:ワンタップでお風呂の記録を残せます。 • カレンダー表示:過去の記録を一目で確認でき、達成感を得られます。 • 連続記録の励まし:途切れても温かいメッセージで次の一歩をサポート。 • レベルアップ機能:お風呂に入るたびに経験値を獲得し、楽しく続けられます。 • プライバシー保護:データは非公開。自分だけの習慣づくりに集中できます。 BathLog+は、メンタルヘルスに不調があっても無理なく使える設計です。心と体のリフレッシュをサポートし、少しずつ新しい習慣を育てていきましょう。BathLog+が毎日の小さな一歩を応援します。
Caffeine mg
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Caffeine mg is a one-tap caffeine tracker that visualises remaining body caffeine and the time it drops below a sleep-friendly threshold using a half-life decay model. "Can I have one more coffee this afternoon and still sleep tonight?" — that's the question this app answers. ■ Who it's for - Daily coffee or energy drink consumers - People whose afternoon caffeine affects sleep - Users who prefer no ads and one-time purchases - Login-free tracking with caffeine records stored on device ■ Main features - 50+ preset drinks (coffee, energy drinks, tea, etc.) - Custom drinks with caffeine content and serving size - Tap to log "now", long press to set the time - Today's total intake and remaining allowance (400mg default) - Half-life decay simulation - Home screen widget for one-tap logging - Siri / Shortcuts support - Last 7 days of history ■ iOS 18 features (Pro) - Live Activity + Dynamic Island for body caffeine + sleep-friendly time - Lock Screen Control + Control Center for one-tap logging - Action Button on iPhone 15 Pro and later - Half-life simulation chart ■ Pro (one-time, JPY 370) - Unlimited custom drinks - Live Activity / Dynamic Island - Lock Screen Control - Action Button integration - Full history + CSV export - Medium / Large widgets ■ Why we made it - Free to start (50+ presets + 3 custom drinks) - No login, no account - Caffeine records stay on device; anonymous usage events are optional - No subscription. Pro is one-time only. - Zero ads. ■ Science - Daily upper limit 400 mg (WHO / FDA / EFSA / Health Canada / Japan MHLW Sleep Guidelines 2023 consensus) - 50 mg "sleep-friendly residual" threshold per Japan MHLW Sleep Guidelines 2023 - Default half-life is 5 hours (individual range 3-7 hours) - All thresholds adjustable in Settings ■ Requirements - iOS 18.0 or later (for Live Activity / Lock Screen Control / Action Button) This app is intended as a caffeine intake tracker. It does not provide medical advice, diagnosis, drug-interaction checks, or individualised guidance for pregnant users, users with cardiac conditions, etc. Please consult a doctor or pharmacist for health decisions.
Screenshots
Verdict
The clearest difference is in-app purchases: BathLog+ at none against Caffeine mg's 1. Caffeine mg's advantage is update cadence (weekly vs every 9 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. Caffeine mg sells 1 one-off in-app purchase. BathLog+ asks for nothing beyond the download.
BathLog+ ships an update every 9 months, Caffeine mg weekly. The most recent releases landed on September 9, 2026 and September 20, 2026 respectively.
| Parameter | BathLog+ | Caffeine mg |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.0 | 18.0 |
| Further details — not scored | ||
| Size | 17 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Ai Kaneko | kensuke ueda |
In-app purchases
BathLog+
No in-app purchases
Caffeine mg
- カフェインmg Pro$1.99







