B Side vs 睡眠FM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
B Side
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.
- Vintage cassette player aesthetic
- 8 high-quality audio tracks
- Dark mode for nighttime
- Exclusive membership content
- Ambient sound player
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- Vintage White Noise Cassette Player - 8 high-quality audio tracks - Dark mode for better use at night - Unique exclusive membership cassette case
睡眠FM
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.
- Diverse natural sound library
- High-quality, professional sound effects
- Simple and intuitive interface
- No login or registration required
- Ideal for sleep, relaxation, and concentration
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睡眠FM旨在为用户提供合适的睡眠、放松和集中体验。 它包含了多种自然的声音,例如风、雨、雷、海浪、河流、森林、鸟鸣声等等, 可以满足用户的不同需求。无论是在床上入睡,还是在办公室需要集中注意力,这款应用都能提供合适的白噪音。 睡眠FM复古收音机的造型,将极简风格发挥到了极致。 睡眠FM同时非常适合学生使用。白噪声对于学习时需要营造的专注自律的环境也是有很大的帮助。 功能特点 - 多种自然声音:该应用程序包含了许多不同种类的自然声音,如海浪、风、雨、河流、森林和白噪音等等。用户可以根据自己的需求选择适合自己的声音。 - 高品质音效:该应用程序的音效都是经过专业录制和精心制作的,以确保较高的音质和真实感。无论何时何地,都可以享受到较好的音效体验。 - 界面简洁直观:该应用程序的界面非常简单易用,用户可以轻松浏览和选择不同的声音,让用户能够更加方便地使用。 - 轻便易用:该应用程序非常轻便易用,可以在任何时间和地点使用。无需登录或注册,只需下载安装后即可享受合适的白噪音体验。
Screenshots
Verdict
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.
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. 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.
| Parameter | B Side | 睡眠FM |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (8 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 62.5% of reviews | — |
| Number of ratings | 8 — better | 1 |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 153 MB | 397 MB |
| Age rating | 9+ | 4+ |
| Developer | One Hundred Bad Ideas Limited | Hefei Zhang Yu Intelligent Technology Co., Ltd. |
Customer experience
B Side
睡眠FM
In-app purchases
B Side
- Lifetime$4.99
睡眠FM
No in-app purchases








