Under FM vs HangSpine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
HangSpine
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HangSpine turns your Apple Watch into a dead-hang counter. Grab the bar and just hang — your watch's motion sensors detect the hang automatically and start the count for you. No buttons mid-workout, no phone needed. Every 10-second hold counts as one rep, confirmed by a haptic tap so you always know where you stand. WHY DEAD HANGS Dead hangs decompress the spine and shoulders after long hours at a desk, build grip strength, and stretch the whole upper body. A few minutes on the bar is one of the simplest full-body resets you can do. SMART DETECTION THAT ADAPTS TO YOU • Hang detection runs on the watch's gyroscope — mount the bar and the countdown starts by itself; dismount and it stops • Set your own pace: 10/12/15 s per rep and a daily goal you choose • An experimental on-device learning engine keeps learning your mount and dismount motion, so detection gets more accurate the more you train — no two bodies or bar setups are alike, and HangSpine adapts to yours. It's continuously improved and never affects everyday counting • Everything is computed and stored locally. Nothing is ever uploaded for training ON YOUR PHONE • Today's goal ring, streak flame, and day/week/month/year charts • 26-week GitHub-style heatmap of your training consistency • Trace viewer for every session: angle, X/Y/Z gravity components, and grip energy — see exactly what the sensor saw PRIVACY BY DESIGN All data stays on your devices. No account, no tracking, no ads, no servers. One-time purchase. No subscription.
Screenshots
Verdict
The clearest difference is price: Under FM at Free against HangSpine's $5.99. HangSpine's advantage is in-app purchases (none vs 2) and update cadence (daily vs every 3 days). On 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
Under FM is free to download; HangSpine costs $5.99 up front. Under FM sells 2 in-app purchases, starting at $9.99 per year. HangSpine asks for nothing beyond the download.
Under FM ships an update every 3 days, HangSpine daily. Both last shipped on October 31, 2026.
| Parameter | Under FM | HangSpine |
|---|---|---|
| Price | Free — better | $5.99 |
| Rating | 5.0 (7 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 3 days | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, Apple Watch — better |
| Requires iOS | 18.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 87 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | EnterMaurs | 永鹏 梁 |
In-app purchases
Under FM
- Under FM Pro Annual$9.991 Year
- Under FM Pro Lifetime$14.99
HangSpine
No in-app purchases









