# B Side vs 睡眠FM

The clearest difference is rating: 睡眠FM at 5.0 against B Side's 4.4. 睡眠FM also leads on in-app purchases (none vs 1). B Side's advantage is ads (none vs shown) and update cadence (fortnightly vs every 6 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. B Side sells 1 one-off in-app purchase. 睡眠FM asks for nothing beyond the download.

睡眠FM holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: B Side has 8 ratings behind it against 1, so its average is the more settled of the two.

B Side ships an update fortnightly, 睡眠FM every 6 weeks. The most recent releases landed on September 5, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | B Side | 睡眠FM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (8 ratings)](https://appshunter.io/ios/app/b-side-white-noise/id1667406977/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fm/id6449446299/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 6 weeks |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 153 MB | 397 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [One Hundred Bad Ideas Limited](https://appshunter.io/developer/1636421604) | [Hefei Zhang Yu Intelligent Technology Co., Ltd.](https://appshunter.io/developer/1189870243) |

## What reviewers say

### B Side

[App page](https://appshunter.io/ios/app/b-side-white-noise/id1667406977)

Experience calming ambient sounds with a vintage cassette player interface. Offers 8 high-quality audio tracks and a dark mode for nighttime use. Unlock exclusive content with a membership.

**Highlights:** Vintage cassette player aesthetic, 8 high-quality audio tracks, Dark mode for nighttime, Exclusive membership content, Ambient sound player

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $4.99 | one-time |


### 睡眠FM

[App page](https://appshunter.io/ios/app/fm/id6449446299)

This app offers a variety of high-quality natural sounds like rain, wind, and ocean waves to aid sleep, relaxation, and focus. Its minimalist design and user-friendly interface make it easy to create a calming atmosphere for any situation, from bedtime to study sessions.

**Highlights:** Diverse natural sound library, High-quality, professional sound effects, Simple and intuitive interface, No login or registration required, Ideal for sleep, relaxation, and concentration

**In-app purchases:** none


## Frequently asked questions

### Is B Side free?

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

### Is 睡眠FM free?

睡眠FM is free to download, with no in-app purchases.

### Which has better reviews, B Side or 睡眠FM?

睡眠FM is rated higher. B Side averages 4.4 out of 5 from 8 ratings, while 睡眠FM averages 5.0 from 1 ratings.

### Do B Side or 睡眠FM have ads?

睡眠FM shows ads; B Side does not.

### Which is updated more often, B Side or 睡眠FM?

B Side ships an update fortnightly, and 睡眠FM every 6 weeks. Most recently, B Side was updated on September 5, 2026 and 睡眠FM on June 11, 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.*