ScalePal vs OpenSleep
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ScalePal
Easily track your weight progress with a simple, clutter-free interface. Log weigh-ins quickly, view trends, and stay motivated with daily streaks and home screen widgets. Gain insights into factors affecting your weight with optional context and weather checks.
- Quick weight logging with notes
- Daily trend charts and goal tracking
- Streak tracking for consistency
- Home Screen widget support
- Trend prediction based on pace
- Optional context and weather check-ins
- Apple Health sync
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ScalePal is the simplest way to track your weight journey. No account. No subscription. No clutter. Log your weight in seconds, see your trend over time, and stay consistent with daily streak tracking — right from your Home Screen widget. WHAT'S NEW • Trend prediction: ScalePal analyzes your progress and tells you when you could realistically reach your goal, based on your actual pace — not a generic formula. • Context check-in: When your weight looks a bit unusual, ScalePal quietly asks what was going on (sleep, stress, hydration). Optional and never guilt-based. Over time, it shows you what actually affects your weight. • Weather context: ScalePal checks local weather when you log an unusual reading — hot, humid days can cause water retention, and now you'll know. FEATURES • Quick log with notes and custom date/time • Daily trend chart with goal tracking • Streak tracking to keep you consistent • Home Screen widget for at-a-glance check-ins • Apple Health sync — your data stays on your device • Supports lbs and kg
OpenSleep
This app offers a privacy-focused, offline sleep tracker and AI coach. It analyzes your sleep patterns locally on your device, synchronizes with Apple Health, and provides detailed insights without sending any data to servers.
- Offline sleep tracking
- Local AI sleep coach
- Apple Health synchronization
- Sleep cycle and stage analysis
- Privacy-first, serverless design
- Detailed sleep history
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OpenSleep tracks your sleep stages without a watch or ring, and explains them with an AI sleep coach that runs entirely on your iPhone. TRACK SLEEP WITHOUT A WEARABLE Choose how your phone listens to the night: • Sonar (contactless): leave your iPhone on the nightstand. OpenSleep uses ambient sound levels to pick up sleep cues. Raw audio is never recorded or stored. • Mattress mode: place your iPhone flat on the mattress next to your pillow and let the motion sensor follow your movement. SEE EVERY STAGE OF YOUR NIGHT • Awake, REM, light and deep sleep, shown on a stage ring and a full-night sleep pattern chart • Bedtime, wake-up time and total sleep for every session • History with day, week, month and year views to spot trends AN AI SLEEP COACH THAT STAYS ON YOUR PHONE Ask about your sleep, your routine or why you wake up tired. The coach is a large language model that runs on your device, so your questions and answers are never sent to a server. Download the model once, then chat even with no connection. WORKS WITH APPLE HEALTH OpenSleep writes your sleep sessions and stages to Apple Health and can show sleep already recorded there. PRIVATE BY DESIGN • No account and no sign-up • Sleep analysis happens on your iPhone • Open source: anyone can read the code Available in English, Spanish, Portuguese, German, French and Italian. Sleep tracking is free. The AI Sleep Coach is a one-time purchase with no subscription. OpenSleep is a wellness tool, not a medical device. Talk to a doctor about any sleep or health concerns.
Screenshots
Verdict
The clearest difference is price: OpenSleep at Free against ScalePal's $1.99. OpenSleep also leads on update cadence (every 11 days vs every 2 months). ScalePal's advantage is in-app purchases (none vs 1) and iOS requirement (17.6 vs 26.0). On rating, ratings volume, ads and device support 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
OpenSleep is free to download; ScalePal costs $1.99 up front. OpenSleep sells 1 one-off in-app purchase. ScalePal asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for ScalePal against 5.0 for OpenSleep. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
ScalePal ships an update every 2 months, OpenSleep every 11 days. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.
| Parameter | ScalePal | OpenSleep |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 4 MB | 73 MB |
| Age rating | 4+ | 12+ |
| Developer | Chuma Steve Okoro | Yuan Qian |
Customer experience
ScalePal
OpenSleep
In-app purchases
ScalePal
No in-app purchases
OpenSleep
- OpenSleep Lifetime Premium$2.99









