LifeOS vs Second Brain
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
LifeOS
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Self-Observation Method Five small practices that decide how today's you should move. Observe โ Select โ Act โ Notice โ Restore LifeOS is the best implementation of this method. You could practice it on paper. But for connecting sleep, activity, tasks, focus, and reflection into one place, LifeOS is the most natural fit. The more you continue, the more the data starts to return "your strengths and habits." Morning deep worker. Monday starter. The way your focus drops on the third session. LifeOS gives you back the final fruit of observation. "I feel off today." But you don't know why. Tasks pile up. Some days motivation just isn't there. But without knowing the cause, you repeat the same cycle. LifeOS - Self Observatory turns that vague feeling into a number. Your sleep, activity, and focus data become a daily energy score from 0 to 100. Tasks are suggested with reasons matched to your condition. The more you use it, the more your winning patterns emerge. A behavioral insight OS that tells you the best way to move through your day. Your companion for upgrading not just work, but life itself. Your Strengths + Your Observations (new in v2.5) After 14+ days of focus data, your strength type emerges โ morning deep worker, evening sprinter, steady type, monday starter, evolving. Habit observations are delivered as findings, not judgments. Strengths needing more data are previewed as "unlocking in N days." Today's Power Your daily energy, scored from sleep, activity, and calendar data. Know at a glance whether today is a day to push hard or take it easy. AI generates personalized advice that changes every day. Today's 3 Tasks recommended with reasons matched to your energy. Switch by day with the date calendar. Toggle between "To Do" and "Today" modes. Tasks abandoned 30+ days get one-tap triage. Type "tomorrow 6pm" or "every Monday" โ AI parses dates and recurrence automatically. Your Day Guide 3 tips based on your patterns, displayed every day. Auto-adapts to Power state, time of day, meeting load, and sleep. Insights "On 7+ hour sleep nights, your focus is 42% longer." Sleep vs focus, steps vs task completion, auto-correlated. The more you use it, the more your own patterns emerge. AI Monthly Review (Pro) At the start of each month, AI analyzes your previous month โ winning patterns, trends, and next-month suggestions. Reset Protocol NOT (what to avoid), GO (where you're heading), DO (today's actions). A guided reflection to regain direction. Results stay on your dashboard at all times. Pomodoro Timer Every focus session feeds your Insights. Control from Live Activity, Dynamic Island, or Apple Watch. Apple Watch + Complications Power score displayed on your watch face. Know today's state with a glance at your wrist. Weather + Power Detects approaching low pressure and factors it into your Power score. Now you know why you feel off. Life Goals Your bucket list, visualized. Track long-term goal progress. Complete Privacy All data processed on-device only. Nothing sent to external servers. Cross-Device Sync Seamlessly sync across iPhone, Mac, and Apple Watch via iCloud. No re-onboarding when you add a new device. LifeOS Pro unlocks AI Monthly Review, correlation analysis, long-term trends, unlimited tasks, and unlimited Reset Protocol via an auto-renewable subscription (monthly or yearly). Pricing varies by region and is shown in the App Store. Payment is charged to your Apple ID on purchase. The subscription auto-renews unless turned off at least 24 hours before the current period ends. Renewal is charged within 24 hours of period end. Manage and cancel in your App Store account settings. Privacy Policy: https://rkpg.net/lifeos/privacy-policy-en.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Available in Japanese and English.
Second Brain
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Second Brain is your offline-first personal knowledge management app. Capture every idea, note, and insight โ and never lose a thought again. No ads. No tracking. No account required. Your data stays on your device. FEATURES: โข Rich Notes โ Write with Markdown support, add images, link notes together โข Collections โ Organize notes into collections with icons and colors โข Tags โ Tag anything for instant filtering โข Daily Notes โ One note per day, automatically created โข Goals โ Track personal goals with milestones and progress โข Book Notes โ Capture key takeaways from books you read โข Quotes โ Save your favorite quotes โข Knowledge Graph โ See how your ideas connect visually โข Bi-directional Links โ Link notes and see backlinks automatically โข Full-Text Search โ Find anything instantly โข Favorites & Archive โ Star important notes, archive the rest โข Quick Capture โ Capture thoughts from the home screen widget โข Face ID / Touch ID โ Lock your app for privacy โข iCloud Backup โ Optional, off by default โข Export โ PDF, CSV, Markdown โข 15 Languages โ 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.
Screenshots
Verdict
The clearest difference is update cadence: LifeOS at every 8 days against Second Brain's every 3 months. Second Brain's advantage is iOS requirement (15.0 vs 26.1). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. LifeOS sells 2 in-app purchases, starting at $2.99 per month and Second Brain sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
LifeOS ships an update every 8 days, Second Brain every 3 months. The most recent releases landed on September 23, 2026 and September 24, 2026 respectively.
| Parameter | LifeOS | Second Brain |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 days โ better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, Mac, Apple Watch โ better | iPhone, iPad, iPod |
| Requires iOS | 26.1 | 15.0 โ better |
| Further details โ not scored | ||
| Size | 14 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Ryota Kimura | Selahattin Bozat |
In-app purchases
LifeOS
- LifeOS Pro (Monthly)1 Month trial$2.991 Month
- LifeOS Pro (Yearly)1 Month trial$29.991 Year
Second Brain
- Second Brain Premium$9.99









