Slather vs Just VO2 Max
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Slather
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Slather reminds you when to reapply sunscreen — so you stay protected without watching the clock. It checks the live UV index for your exact location, you pick your SPF, and Slather counts down to your next reapplication, sending a reminder the moment it's time. • Live UV index for your location (via Apple WeatherKit) • Pick SPF 15 / 30 / 50 / 50+ — the reapply window adjusts to match • A clear countdown with a reminder when it's time to reapply • Live Activity on your Lock Screen and Dynamic Island • Apple Watch app + complications — glance at the UV and reapply, or start a session, from your wrist • UV-exposure history, with optional sync to Apple Health • Light and dark mode Slather asks for Location (to look up your UV) and Notifications (for reminders). There's no account, no ads, and no tracking — your data stays on your device. Heads up: the UV index reads 0 (Low) at night or indoors — that's correct, not a bug. Step outside in daylight to see a real reading. Slather Premium (optional) Everything above is free — live UV, SPF timing, reapply reminders, the Live Activity, the Apple Watch app, and Apple Health sync. Premium adds two extras: • Family profiles — track SPF and reapply timers for everyone you protect • Weekly insights — your sessions, protection time, and strongest sun days • Slather Premium — $4.99 per year, starting with a 7-day free trial • Slather Premium Lifetime — $14.99, a one-time purchase Payment is charged to your Apple Account at confirmation of purchase. A subscription renews automatically unless it is canceled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours of the end of that period. You can manage or cancel your subscription in your Apple Account settings after purchase. Any unused portion of a free trial is forfeited when you purchase a subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://scotch333.github.io/slather-legal/
Just VO2 Max
Displays your most recent VO2 Max reading from Apple Health directly on your Apple Watch face. It refreshes automatically when new data is available after your workout, keeping your health information private and on your device.
- VO2 Max display
- Apple Health integration
- Automatic refresh
- On-device data storage
- Read-only data access
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Your VO₂ max, wherever you look first. Just VO2 Max brings your latest Apple Health estimate to three equally important places: your Apple Watch face, iPhone Home Screen, and iPhone Lock Screen. Check your value without opening an app. ON YOUR WATCH FACE Choose a circular, rectangular, or corner complication. The rectangular style also shows your trend and measurement date and time. ON YOUR HOME SCREEN Choose a small, medium, or large widget. Each shows your value, trend, and measurement date and time. The large widget adds a chart of up to six recent readings. ON YOUR LOCK SCREEN Choose a circular gauge or rectangular widget. The rectangular style shows your value, measurement date and time, and trend when available. COMPANION APPS Use the iPhone and Apple Watch apps to grant read-only Health access and view the latest reading. The Watch app updates when opened. The iPhone app also shows up to six recent readings, with controls to refresh and check setup. The iPhone dashboard adapts to iPhone Duo’s closed and unfolded displays, in portrait and landscape. SIMPLE AND PRIVATE • Free, with no account or subscription • Read-only access to VO₂ max in Apple Health • Health readings stay on your devices • No ads in widgets, complications, or the Watch app • The iPhone companion app is supported by banner ads Just VO2 Max displays estimates already stored in Apple Health. It does not measure or calculate VO₂ max. New readings depend on Apple Health and supported workouts; iOS and watchOS manage refresh timing. The trend compares your latest estimate with up to three previous readings. Your VO₂ max values, sample dates, and sources are never sent to advertising or analytics providers. The app displays fitness information only and does not provide medical advice.
Screenshots
Verdict
The clearest difference is in-app purchases: Just VO2 Max at none against Slather's 2. Just VO2 Max also leads on update cadence (every 6 days vs every 2 months) and iOS requirement (17.0 vs 26.0). Slather's advantage is ads (none vs shown). On price 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. Slather sells 2 in-app purchases, starting at $4.99 per year. Just VO2 Max asks for nothing beyond the download.
Slather ships an update every 2 months, Just VO2 Max every 6 days. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.
| Parameter | Slather | Just VO2 Max |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 2 months | Every 6 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, Apple Watch |
| Requires iOS | 26.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | David Price | Cuprea s.r.o. |
In-app purchases
Slather
- Slather Premium7 Days trial$4.991 Year
- Slather Premium Lifetime$14.99
Just VO2 Max
No in-app purchases









