The90 Gem vs Fitmo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The90 Gem
This jewelry-inspired sensor tracks your skin's real-time UV exposure. It helps you protect against aging and harness the sun's health benefits.
- Real-time UV tracking
- Skin exposure monitoring
- Aging protection
- Sun health benefits
- Jewelry-inspired design
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The jewelry-inspired UV sensor that tracks what your skin actually experiences, so you can protect how you age while harnessing the health benefits of the sun.
Fitmo
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Build a training habit you can see. Fitmo is a workout tracker and gym log for strength training. Record your sets, reps and weights, keep your routines ready, and turn each finished session into a clear picture of your effort. Whether you are starting your first gym routine or keeping a detailed lifting diary, Fitmo helps you remember what you did and plan what comes next. LOG YOUR WORKOUT • Record sets, reps, weight, duration and notes. • Start from a saved routine or add exercises as you train. • Use rest timing to keep your session moving. • Explore hundreds of exercise visuals for barbell, dumbbell, machine and bodyweight training, with highlighted target muscles. FOLLOW YOUR PROGRESS • Review past workouts in a calendar and detailed session history. • Track training volume and personal records. • Create workout report images in feed and story formats. • Import supported workout-history exports from Strong, Hevy, and Xunji. KEEP YOUR TRAINING CIRCLE CLOSE • Connect with friends through private friend codes. • Choose which profile statistics and workout summaries to share. • React to friends' training and keep each other motivated. • Log workouts and connect with friends using a guest profile. Optionally link your profile with Sign in with Apple. ON YOUR WRIST Start a workout on iPhone, then follow the active exercise and complete sets from the paired Apple Watch companion. Workout changes sync between your devices. A PLAN THAT FITS YOUR TRAINING Guided setup helps you choose your goals, weekly frequency, experience and equipment. Preview a recommended routine, then unlock the full generated plan with Pro. You can also build and use your own routines. FITMO PRO Core workout logging, your own routines and history are available without a subscription. Free profiles can connect with up to 3 accepted friends; Pro expands that circle to 50 and adds generated training plans, private squad creation and additional report designs. Pro is available as an annual subscription. Existing friendships remain if Pro ends. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Payment is charged to your Apple Account at confirmation. Manage or cancel subscriptions in App Store account settings. Restore purchases from Fitmo Pro. Prices and billing periods are shown before purchase. Make your next session count. Start your training diary with Fitmo. Privacy policy: https://huuminstudio.github.io/spotd/privacy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Support: https://huuminstudio.github.io/spotd/support/
Screenshots
Verdict
The clearest difference is in-app purchases: The90 Gem at none against Fitmo's 2. The90 Gem also leads on iOS requirement (15.0 vs 17.0). Fitmo's advantage is update cadence (every 4 days vs every 3 weeks). 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. Fitmo sells 2 in-app purchases, starting at $11.99 per year. The90 Gem asks for nothing beyond the download.
The90 Gem ships an update every 3 weeks, Fitmo every 4 days. The most recent releases landed on October 31, 2026 and November 6, 2026 respectively.
| Parameter | The90 Gem | Fitmo |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (9 ratings) — better | — |
| Positive reviews | 85.7% of reviews | — |
| Number of ratings | 9 — better | — |
| Update frequency | Every 3 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 112 MB | 377 MB |
| Age rating | 4+ | 12+ |
| Developer | The90, Inc. | 旻鉴 胡 |
In-app purchases
The90 Gem
No in-app purchases
Fitmo
- Fitmo Pro Annual7 Days trial$11.991 Year
- Fitmo Pro Annual$11.991 Year









