Comparison

sDiary vs Cycle Sleep Rest

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

Head to head
About

sDiary

Features
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One day a page. One intention, a few moments, then seal it. sDiary is a slow, intentional journal. You write a single line for what the day is about, capture a handful of moments as text, photos, or voice, and then seal the page. Once a day is sealed it goes into your book: the long arc of every page you've written. No streaks. No engagement loops. No coach. No social. The day is yours, and so is the book. The flow. Morning. Set an intention. One sentence. Through the day. Add moments. Text, photo, or voice. Evening. Reflect. Seal the day. The page closes; tomorrow is a fresh one. Threads (Pro). The phrases that keep coming back across your sealed days, surfaced automatically. All computation happens on your device. No cloud, no AI provider. Trusted Reader (with Sync). Invite exactly one person you trust to read your sealed days. They see what you chose to share, when you chose to share it. Revoke any time. Year-Review. Every December 31, sDiary auto-opens a retrospective of the year: the intentions, the recurring threads, the sealed-day count. Free, Pro, and Sync. The base app is free, forever. Pro is a one-time unlock that opens Threads, voice moments, unlimited photos per day, full-history search, and Year-Reviews. Sapplify Sync is free with a Sapplify account and covers multi-device sync and the Trusted Reader feature, across every Sapplify app. Local-first, by default. Your days live in a SQLite database on your phone. Nothing leaves your device unless you turn on Sapplify Sync, and even then, only your own data, to your own account. Terms of Use: https://www.sapplify.com/terms/sdiary/ Sapplify Account Privacy: https://www.sapplify.com/policies/account/ Sapplify Account Terms: https://www.sapplify.com/terms/account/

About

Cycle Sleep Rest

Features
Read full description

Struggling with insomnia? Wake up feeling exhausted? Optimize your rest with science-backed sleep tracking. Cycle Sleep Rest is your ultimate sleep companion, designed to improve your sleep quality, reduce nighttime anxiety, and help you wake up energized. By combining an advanced sleep cycle tracker, a customizable ambient sound mixer, and a gentle smart alarm clock, this app provides everything you need to build healthy bedtime habits. Main Features Sleep Tracker and Analysis Monitor your sleep cycles effortlessly. The app tracks your sleep patterns to analyze your deep sleep, light sleep, and REM phases. Gain valuable insights into your sleep efficiency and overall rest quality without needing to wear extra hardware. Custom Sound Mixer and White Noise Create a relaxing environment to fall asleep faster. Mix and match from a premium library of ambient sounds, including white noise, heavy rain, ocean waves, forest nights, and meditation music. Customize individual volumes to build your ideal soundscape. Smart Alarm Clock Eliminate morning grogginess. The intelligent alarm tracks your sleep cycles and wakes you up gently during your lightest sleep phase. Start your day naturally with soothing, peaceful melodies instead of loud, jarring alarms. Sleep History and Trends Take control of your sleep hygiene. Review comprehensive charts of your sleep history daily, weekly, or monthly. Easily identify sleep debt, monitor changes over time, and discover how your daily choices affect your night's recovery. Why Choose Cycle Sleep Rest Understand your natural sleep architecture and biological clock. Fall asleep quickly using personalized sound combinations. Wake up at the optimal mathematical moment of your sleep cycle. Monitor long-term sleep trends to improve your daily energy levels. Download Cycle Sleep Rest today to track your sleep cycle, enjoy relaxing white noise, and experience refreshing mornings.

Screenshots

sDiary4 screens
Cycle Sleep Rest4 screens

Verdict

The call

The clearest difference is in-app purchases: Cycle Sleep Rest at none against sDiary's 3. sDiary's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, device support and iOS requirement 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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. sDiary sells 3 in-app purchases, starting at $1.99 per month. Cycle Sleep Rest asks for nothing beyond the download.

UpkeepUpdate frequency

sDiary ships an update every 3 weeks, Cycle Sleep Rest every 2 months. The most recent releases landed on October 10, 2026 and October 12, 2026 respectively.

Scorecard2 real differences ยท 4 level
sDiary versus Cycle Sleep Rest: the parameters behind the verdict, then further details
ParametersDiaryCycle Sleep Rest
PriceFreeFree
Update frequencyEvery 3 weeks โ€” betterEvery 2 months
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details โ€” not scored
Size47 MB90 MB
Age rating4+4+
DeveloperAnthony Eli RaschTran Phuong Nga

In-app purchases

3 purchases

sDiary

Subscriptions2
  • Sapplify Sync Monthly1 Month trial$1.991 Month
  • Sapplify Sync Yearly1 Month trial$19.991 Year
One-time1
  • sDiary Pro$29.99
None

Cycle Sleep Rest

No in-app purchases

Questions

Is sDiary free?
sDiary is free to download, with in-app purchases available.
Is Cycle Sleep Rest free?
Cycle Sleep Rest is free to download, with no in-app purchases.
Do sDiary or Cycle Sleep Rest have ads?
Neither sDiary nor Cycle Sleep Rest shows ads.
Which is updated more often, sDiary or Cycle Sleep Rest?
sDiary ships an update every 3 weeks, and Cycle Sleep Rest every 2 months. Most recently, sDiary was updated on October 10, 2026 and Cycle Sleep Rest on October 12, 2026.

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