OOLER vs TreadCal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OOLER
This app controls a smart sleep system that regulates your sleeping surface temperature for optimal rest. It allows for personalized schedules, temperature adjustments, and features like a gentle warming alarm to improve your sleep and wake routines.
- Adjustable mattress temperature (55-110°F)
- Personalized sleep schedules
- Temperature variations for sleep
- Warm Awake alarm feature
- Adjustable fan speed modes
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The OOLER app is designed to work seamlessly with the OOLER Control Unit. OOLER, made by Sleepme Inc. and the minds behind the chiliPAD, is the most advanced of its kind to address the frequently overlooked but crucial sleep factor: temperature. OOLER is our most luxurious sleep system, which adjusts your sleeping surface temperature from 55-110°F (13-43°C). Control Your Sleep Temperature - Increase or decrease your mattress temperature to your desired level - Select your sleep temperature from 55°-110°F (13°-43°C) Set Personalized Sleep Schedules - Enjoy temperature perfection all night long - Set multiple sleep temperatures for the night or week ahead - Set temperature variations to fall asleep warm and stay asleep cold or anywhere in-between Improve your Evening & Morning Routine - Set bedtime reminders to improve your bedtime consistency - Use the Warm Awake feature as alarm clock replacement. Enjoy waking up with a gentle warming of the mattress temperature to trigger your body’s natural wake response & More - Set your desired noise level with Silent, Regular and Boost fan speed modes Finally, sleep as nature intended with OOLER. Learn more and get yours at chilisleep.com.
TreadCal
Estimate calories burned and vertical climb during incline treadmill workouts. It uses your weight, speed, incline, and optional weighted vest to provide accurate estimates. Shareable climb cards summarize your progress.
- Incline-aware calorie estimates
- Vertical climb and distance tracking
- Live heart rate and zones on Apple Watch
- Weighted vest calorie contribution
- Shareable climb cards
- Treadmill calibration
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TreadCal helps you understand your incline-treadmill and walking-pad workouts. Enter your treadmill’s speed and incline—or measure its stopped deck with your iPhone—then start your workout on Apple Watch. TreadCal combines your weight, grade, speed, optional weighted vest, and rail use to estimate active calories. MAKE EVERY CLIMB COUNT • Incline-aware active-calorie estimates • Vertical climb and approximate treadmill distance • Live heart rate and heart-rate zones on Apple Watch • Time spent in each heart-rate zone • Weighted-vest calorie contribution included in your total • Workout receipts with steps, duration, and workout settings • A shareable climb card for every workout; the artwork grows with the climb MEASURE YOUR TREADMILL Use two-position iPhone calibration to map your treadmill’s console setting to measured percent grade. Calibrate only while the belt is stopped. YOUR WORKOUT IS YOURS Apple Watch workouts require permission to write Workouts and Active Energy to Apple Health. Other Health read permissions and Motion permission are optional. TreadCal keeps your profile, calibration, and workout history on your devices. No account, ads, or analytics. TRY THREE WORKOUTS Your first three completed workouts are included. Unlock unlimited workouts with a single TreadCal Pro purchase. No subscription. TreadCal is an exercise estimator, not a medical device. Calories and heart-rate zones are estimates; distance depends on the speed you enter. Never place your iPhone on a moving treadmill belt. Heart-rate zone features require watchOS 27 and appropriate permissions.
Screenshots
Verdict
The clearest difference is in-app purchases: OOLER at none against TreadCal's 1. OOLER also leads on ratings volume (3.2K vs 1) and iOS requirement (14.0 vs 18.0). TreadCal's advantage is update cadence (weekly vs every 4 weeks) and rating (5.0 vs 4.8). On price, 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
Both are free to download. TreadCal sells 1 one-off in-app purchase. OOLER asks for nothing beyond the download.
TreadCal holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: OOLER has 3.2K ratings behind it against 1, so its average is the more settled of the two.
OOLER ships an update every 4 weeks, TreadCal weekly. The most recent releases landed on November 2, 2026 and October 29, 2026 respectively.
| Parameter | OOLER | TreadCal |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (3.2K ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 40.5% of reviews | — |
| Number of ratings | 3.2K — better | 1 |
| Update frequency | Every 4 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 32 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Sleepme Inc. | Carbide Studios |
Customer experience
OOLER
TreadCal
Bugs and requests
OOLER
Reported bugs
5 issues- App randomly resets temperature settings
- Schedules not working as expected
- Bluetooth connectivity issues
- App logging users out unexpectedly
- Water level monitoring not functioning properly
Requested features
5 requests- Add Celsius temperature display option
- Implement variable/customizable sleep schedules
- Integrate with smart home platforms (Alexa, HomeKit, etc.)
- Add automatic shut-off timer feature
- Improve app UI and user experience
TreadCal
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OOLER
No in-app purchases
TreadCal
- TreadCal Pro$3.99









