# Under FM vs HangSpine

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 chart position (#154 vs unranked). On ads and device support there is nothing between them.

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.

## The numbers

| Metric | Under FM | HangSpine |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/under-fm-background-beats/id6793174840/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 days | **Daily** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | — | **#154** |
| Size | 87 MB | 4 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [EnterMaurs](https://appshunter.io/developer/1546558152) | [永鹏 梁](https://appshunter.io/developer/6817050220) |

## What reviewers say

### Under FM

[App page](https://appshunter.io/ios/app/under-fm-background-beats/id6793174840)

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.

**Highlights:** Background beats under podcasts/audiobooks, Standalone music playback, Adjustable tempo and volume, Lock Screen controls, Favorites and recent tracks, No account required

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Under FM Pro Annual | $9.99 | per year |
| Under FM Pro Lifetime | $14.99 | one-time |


### HangSpine

[App page](https://appshunter.io/ios/app/hangspine/id6817156558)

**Currently charting:** #154 Top Paid · Health & Fitness (US App Store)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Under FM free?

Under FM is free to download, with in-app purchases available.

### Is HangSpine free?

HangSpine costs $5.99, with no in-app purchases.

### Do Under FM or HangSpine have ads?

Neither Under FM nor HangSpine shows ads.

### Which is updated more often, Under FM or HangSpine?

Under FM ships an update every 3 days, and HangSpine daily. Most recently, Under FM was updated on October 31, 2026 and HangSpine on October 31, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*