# Comma vs Under FM

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.

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.

## The numbers

| Metric | Comma | Under FM |
| --- | --- | --- |
| Price | Free | Free |
| 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 | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 53 MB | 87 MB |
| Requires iOS | **18.2** | 18.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Whio Studios Pty Ltd](https://appshunter.io/developer/1814283803) | [EnterMaurs](https://appshunter.io/developer/1546558152) |

## What reviewers say

### Comma

[App page](https://appshunter.io/ios/app/comma-private-period-tracker/id6745863946)

**Features:** macOS Compatibility, iMessage stickers, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $1.99 | per month |
| Plus Annual | $12.99 | per year |
| Plus Lifetime | $19.99 | one-time |


### 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 |


## Frequently asked questions

### Is Comma free?

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

### Is Under FM free?

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

### Do Comma or Under FM have ads?

Neither Comma nor Under FM shows ads.

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

Comma ships an update fortnightly, and Under FM every 3 days. Most recently, Comma was updated on October 16, 2026 and Under FM on October 24, 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.*