Comparison

B Side vs 睡眠FM

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Vintage cassette player aesthetic
  • 8 high-quality audio tracks
  • Dark mode for nighttime
  • Exclusive membership content
  • Ambient sound player
Features
Read full description

- Vintage White Noise Cassette Player - 8 high-quality audio tracks - Dark mode for better use at night - Unique exclusive membership cassette case

About

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.

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
Read full description

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

B Side4 screens
睡眠FM4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
B Side versus 睡眠FM: the parameters behind the verdict, then further details
ParameterB Side睡眠FM
PriceFreeFree
Rating4.4 (8 ratings)5.0 (1 ratings) — better
Positive reviews62.5% of reviews—
Number of ratings8 — better1
Update frequencyFortnightly — betterEvery 6 weeks
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesAd-supported — better
DevicesiPhone, iPodiPhone, iPod
Requires iOS14.014.0
Further details — not scored
Size153 MB397 MB
Age rating9+4+
DeveloperOne Hundred Bad Ideas LimitedHefei Zhang Yu Intelligent Technology Co., Ltd.

Customer experience

B Side

All ratings8 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews8 reviews
Positive62.5%
Neutral12.5%
Negative25.0%

睡眠FM

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

B Side

One-time1
  • Lifetime$4.99
None

睡眠FM

No in-app purchases

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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