Comparison

SpO2 Watcher vs Calometric

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

Head to head
About

SpO2 Watcher

This utility app restores blood oxygen level insights to your Apple Watch. It retrieves data from HealthKit and displays it on your watch face and dashboard, offering real-time readings and historical trends. Designed for privacy, your data remains on your device.

Highlights
  • Re-enable watch visibility for SpO2
  • Real-time blood oxygen dashboards
  • Advanced watch complications
  • 24-hour interactive history graph
  • Automatic background sync
  • 30-day trend analysis
  • On-device data storage
Features
Read full description

RESTORE YOUR SPOβ‚‚ INSIGHTS ON APPLE WATCH SPOβ‚‚ Watcher is a specialized utility designed for users who want full visibility of their blood oxygen data directly on their wrist. While some devices may not display these readings natively, your sensor is still active and securely recording data to the Apple Health app. SPOβ‚‚ Watcher acts as the essential bridge, retrieving that data from HealthKit and restoring it to your watch face and dashboard. β€” KEY FEATURES β€” ● RE-ENABLE WATCH VISIBILITY If you lack a native on-device option to view your blood oxygen levels, our app provides the solution. It pulls the SpOβ‚‚ data already stored in your HealthKit database and displays it instantly on your Apple Watch. ● REAL-TIME DASHBOARDS View your latest blood oxygen percentage at a glance with high-contrast, easy-to-read designs optimized for clarity on the go. ● ADVANCED WATCH COMPLICATIONS Personalize your watch face with our specialized "Four Corner" layout. See your current SpOβ‚‚ value, exact time of measurement, and a smooth historical trend graph without needing to open your iPhone. ● 24-HOUR INTERACTIVE GRAPH Visualize your daily fluctuations with a detailed 24-hour history line chart, helping you identify patterns in your respiratory wellness throughout your routine. ● AUTOMATIC BACKGROUND SYNC Using intelligent observer queries, the app detects new scans as soon as they reach your Health app, ensuring your watch complications stay updated automatically. ● 30-DAY TRENDS Dive deep into your history with comprehensive daily averages, highs, and lows to help you track your long-term wellness journey. β€” PRIVACY & SECURITY: YOUR DATA STAYS YOURS β€” We believe your health data is your most sensitive information. SPOβ‚‚ Watcher is built with a Privacy-First architecture: ● ON-DEVICE STORAGE: All your blood oxygen data is stored locally on your iPhone and Apple Watch. ● NO CLOUD BACKENDS: Your data stays in the secure Apple Health database on your device. We do not have a backend; your data is never "in flight" to a third-party server. ● END-TO-END ENCRYPTION: Your health information is encrypted whenever your device is locked. ● NO DATA SELLING: We strictly follow Apple’s developer guidelines. Your health data is never shared with advertisers or data brokers. β€” WE DO NOT USE YOUR DATA β€” Your data belongs to you. SPOβ‚‚ Watcher does not collect, store, or transmit your health information to any external location. The app simply requests permission to read "Oxygen Saturation" from the Apple Health app for the sole purpose of displaying it locally on your device. We have no access to your data, and we do not track your usage. β€” IMPORTANT DISCLAIMER β€” This app is intended for fitness and wellness purposes only and is not a medical device. It is not intended for the diagnosis of disease or other conditions, or in the cure, mitigation, treatment, or prevention of disease. Always seek the advice of a physician or other qualified health provider with any questions regarding a medical condition. β€” TECHNICAL REQUIREMENTS β€” ● Requires Apple Watch Series 6 or later (excluding SE) with Blood Oxygen sensor. ● Requires authorization to access Oxygen Saturation data in the Apple Health app.

About

Calometric

Log your meals effortlessly using photos, voice, or barcode scanning. Track calories and macros with on-device intelligence and a privacy-focused design. Syncs across Apple devices and offers extensive customization.

Highlights
  • Photo meal scanning
  • Barcode scanning
  • Voice logging
  • Nutrition label OCR
  • On-device intelligence
  • Customizable goals
  • Apple Watch companion app
Features
Read full description

Meet the new Calometric: a beautifully rebuilt calorie and macro tracker that makes every meal easier to understand. Snap a meal, scan a barcode, speak, search, or read a nutrition label. Every result is a starting point you can review and edit before it reaches your food diary: foods, portions, servings, calories, carbs, protein, fat, and saturated fat when it is known. A FOOD DATABASE BUILT TO GROW Food search is now powered by a database that is 10Γ— bigger and still growing, so more foods are ready when you need them. Search for one food or type a whole meal; Calometric can turn it into editable foods before you save. Recent Foods puts the custom foods you use at the top of search, and recently viewed catalog foods remain available when you are offline. FIVE WAYS TO LOG β€’ Photo: Take a meal photo for an editable calorie and macro estimate. With your permission, Calometric sends a resized copy to cloud AI for analysis. β€’ Barcode: Scan packaged food and look it up in the community-maintained Open Food Facts catalog. β€’ Voice: Say what you ate with on-device transcription on supported devices and languages. β€’ Search: Find, adjust, and log foods with the growing database and offline fallback. β€’ Nutrition Label: Point your camera at a nutrition label to read calories and nutrients on your device. TURN DAILY LOGGING INTO A CLEARER PICTURE β€’ Set calorie, macro, and saturated-fat goals β€’ See progress at a glance and follow weekly trends β€’ Save favorite meals, copy meals you eat often, and reuse your own foods β€’ Create a nutrition report for any date range, then preview, print, or share the PDF β€’ Keep unknown saturated-fat values unknown instead of treating them as zero CALOMETRIC ON IPHONE AND APPLE WATCH The refreshed Dashboard puts every way to log in one place, with larger controls and text that follows your Dynamic Type size. On Apple Watch, Quick Add offers your own recent favorites and foods. Put calories, carbs, protein, fat, or saturated fat on your watch face, then keep your day moving. ONE PURCHASE, NO SUBSCRIPTION Your purchase unlocks the whole app with no subscription: every way to log, your full history, goals, reports, widgets, and the Apple Watch app. It also includes 100 photo scans that never expire. Only photo scans use a scan. Barcode, voice, search, and nutrition-label logging never do. When you want more photo scans, optional 100-scan packs are available in the app. Photo scanning allows up to 20 scans per day. YOUR CHOICES, CLEARLY EXPLAINED β€’ No Calometric account or login required β€’ Voice transcription and nutrition-label reading run on your device β€’ Photo analysis processes content in the cloud only after separate permission β€’ Barcode lookups contact Open Food Facts β€’ Meal-history sync through your private iCloud database and Apple Health sync are optional Privacy Policy: https://calometric.app/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Snap. Know. Thrive.

Screenshots

SpO2 Watcher4 screens
Calometric4 screens

Verdict

The call

The clearest difference is price: SpO2 Watcher at $0.99 against Calometric's $14.99. SpO2 Watcher also leads on in-app purchases (none vs 1) and review sentiment (25% vs 0%). Calometric's advantage is update cadence (every 3 days vs every 2 months). On ads, monetization model and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

SpO2 Watcher costs $0.99 and Calometric $14.99 up front. Calometric sells 1 one-off in-app purchase. SpO2 Watcher asks for nothing beyond the download.

UpkeepUpdate frequency

SpO2 Watcher ships an update every 2 months, Calometric every 3 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

Scorecard6 real differences Β· 3 level
SpO2 Watcher versus Calometric: the parameters behind the verdict, then further details
ParameterSpO2 WatcherCalometric
Price$0.99 β€” better$14.99
Positive reviews25.0% of reviews β€” better0.0% of reviews
Update frequencyEvery 2 monthsEvery 3 days β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
MonetizationPaidPaid
Best chart rank#184 β€” betterβ€”
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch β€” better
Requires iOS18 β€” better26.0
Further details β€” not scored
Size8 MB30 MB
Age rating4+4+
DeveloperESCAPADE GLOBAL PRIVATE LIMITEDRicardo Dantas Goncalves

Customer experience

SpO2 Watcher

Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

Calometric

Written reviews4 reviews
Positive0.0%
Neutral50.0%
Negative50.0%

In-app purchases

None

SpO2 Watcher

No in-app purchases

1 purchases

Calometric

One-time1
  • 100 Cloud Scans$4.99

Questions

Is SpO2 Watcher free?
SpO2 Watcher costs $0.99, with no in-app purchases.
Is Calometric free?
Calometric costs $14.99, and also offers in-app purchases.
Do SpO2 Watcher or Calometric have ads?
Neither SpO2 Watcher nor Calometric shows ads.
Which is updated more often, SpO2 Watcher or Calometric?
SpO2 Watcher ships an update every 2 months, and Calometric every 3 days. Most recently, SpO2 Watcher was updated on October 25, 2026 and Calometric on October 24, 2026.

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