Comma vs Under FM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Comma
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Comma: Privacy First Period Tracking We built Comma after seeing a constant stream of news about privacy breaches. We believe that period tracking apps are useful tools, and that you should be able to trust them not to pass around your most sensitive data. Why is Comma different to other period apps? - We built Comma from the ground up with privacy in mind. We don't analyze our users, track any data, or give sensitive information to third parties. Even when accepting payments, we make sure to handle them through secure means. - No rough edges - Comma has a cozy theming and is simple to use - Early warnings - Comma calculates when your next period is expected to arrive, and notifies you beforehand so that you can be prepared - Cozy design - our icon packs add a more personalized feeling What are some key Comma features - Symptom prediction: We have a system which analyzes your past cycles and predicts what you are likely to experience in the days leading up to, and throughout your period - Early warning notifications: we have notifications to give you early warning on when we predict your next period will start so that you aren’t caught unaware - Custom symptoms: track things that matter to you that may not traditionally be covered - Cute icon packs: Have a more comfortable experience with a lighter feeling logger - Data exports: Share your cycle information quickly with your healthcare provider, or analyze it yourself What makes Comma the best period app for you? - If you want to keep your information super private, this is the app for you - If you want something with a more human than clinical feeling, then we've got you covered - If you want something built by a small trustworthy team rather than a big corporation, then get downloading! We offer a Comma Plus Subscription! Comma Plus unlocks enhanced features to personalize your health tracking experience: - Access to exclusive monster and plant icon packs - Create and manage custom symptom tracking categories https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms: https://whiostudios.com/comma-terms
Under FM
Enhance your listening experience by layering background music or beats under podcasts and audiobooks. Adjust volume and tempo to create the perfect ambiance for workouts, chores, or focused work.
- Background beats under podcasts/audiobooks
- Standalone music playback
- Adjustable tempo and volume
- Lock Screen controls
- Favorites and recent tracks
- No account required
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Under FM lets you listen to music and a podcast at the same time. It plays background beats under podcasts and audiobooks, or on their own. Add background music to podcasts while running, walking, cycling, lifting, cleaning, working, or getting through anything that feels better with a beat. Your podcast or audiobook keeps your mind engaged while the music adds energy and rhythm. Start any podcast or audiobook, open Under FM, and choose a beat. Lower the beat volume until it sits beneath the voices, then adjust the tempo to match your pace. Use Under FM for podcast background music, audiobook background music, podcast beats, or simply playing music and spoken audio at the same time. The spoken audio stays clear. The beat stays underneath it. You keep listening without giving up the energy of music. Choose from beats for easy movement, steady sessions, and higher-energy workouts. Save the beats you like, revisit recently played tracks, and control playback from your Lock Screen. Features: • Background beats that play under podcasts and audiobooks • Standalone beats when you want to listen without spoken audio • Adjustable tempo and BPM • Independent beat volume control • Lock Screen playback controls • Favorites and recently played beats • No account or sign-in required • No ads • Free beats, with more available to unlock Use Under FM for: • Background music for podcasts • Music under podcasts • Podcast beats for running and workouts • Audiobook background music • Music and podcasts at the same time • Music and audiobooks at the same time • Running, walking, cycling, lifting, cardio, chores, and focused listening Start your podcast, open Under FM, choose a beat, and keep moving. Privacy Policy: https://www.maurs.com/underfm/privacy Terms & Conditions: https://www.maurs.com/underfm/terms
Screenshots
Verdict
The clearest difference is update cadence: Under FM at every 3 days against Comma's fortnightly. On price, ads, in-app purchases 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. Comma sells 3 in-app purchases, starting at $1.99 per month and Under FM sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.
Comma ships an update fortnightly, Under FM every 3 days. The most recent releases landed on October 16, 2026 and October 24, 2026 respectively.
| Parameter | Comma | Under FM |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (7 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 7 — better |
| Update frequency | Fortnightly | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 18.2 — better | 18.6 |
| Further details — not scored | ||
| Size | 53 MB | 87 MB |
| Age rating | 12+ | 4+ |
| Developer | Whio Studios Pty Ltd | EnterMaurs |
In-app purchases
Comma
- Plus Monthly3 Days trial$1.991 Month
- Plus Annual3 Days trial$12.991 Year
- Plus Lifetime$19.99
Under FM
- Under FM Pro Annual$9.991 Year
- Under FM Pro Lifetime$14.99







