# Pero:Calm, Relax, Focus Sounds — Into Nature

> White noise soundscapes for relaxation, focus, and sleep. (iPhone/iPad app by 凯 刘.)

- Source: https://appshunter.io/ios/app/perocalm-relax-focus-sounds/id1511387610 (this page in markdown: same URL + `.md`)
- Developer: [凯 刘](https://appshunter.io/developer/995766911)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Rating: 5.00/5 from 4 App Store ratings · 16 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 67 MB
- Languages: English
- Released: 2020-05-31
- Data updated: 2026-07-13
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/perocalm-relax-focus-sounds/id1511387610/reviews.md

## What is Pero?

"Pero" is an app that plays white noise

White noise is full of vibration frequencies that the entire human ear can hear, and can help a person relax or sleep。

When you need to concentrate on work and there are always complicated sounds around, you can use white noise to mask it.

In Pero, you can hear
Spring rains, thunderstorms, oceans, nights, summer cicadas, temples, forests, waterfalls, wheat waves and many other white noise that can make you calm and relax

Pero is suitable for the following people

-People who want to focus on studying and working
-People suffering from insomnia
-Deep noisy environment, often interrupted crowd
-Anxious, mentally exhausted high-pressure people
-Meditation practitioners who seek inner peace

## Key features

- White noise soundscapes
- Nature sounds
- Mask distracting noises
- Promote relaxation
- Aid focus
- Improve sleep

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Plus version | $4.99 | one-time |


## Recent user reviews (10 of 16)

All indexed reviews: https://appshunter.io/ios/app/perocalm-relax-focus-sounds/id1511387610/reviews.md

### 5/5 — i like it

*2026-06-24, version 1.8.0*

I like it

### 2/5 — Marketing suggestion

*2024-12-15*

The free version should have a sound that everybody would like and that are simple, such as night and simple rain. You should also have more rain, like rain on tin roof and rain in forest, etc.

### 5/5 — 很简单好用的白噪音软件！

*2023-02-05*

可选的白噪音种类很多，收藏功能也设计的很好！推荐！！！

### 5/5 — Loving Pero

*2021-08-30*

Great choices of different ambient sound, helps me relax when I journal in the morning and in the evening!

### 5/5 — I like the app

*2021-08-04*

Is good and great app.

### 5/5 — Enjoying the peace

*2021-07-15*

Great range of relaxing sounds.

### 4/5 — Nice Background Noise

*2021-05-19*

Nice free content, but much more available with payment.  The slection is decent, but I would have been much happier if there were more options available for free.

### 5/5 — Fascinating app

*2021-03-27, version 1.8.0*

I really love it.
It reduces every distraction from my noisy neighborhood.

### 4/5 — Relaxing...

*2021-03-13*

If you want relaxing sounds or white noise in the background, this app does the trick!  Would be great if they came out with visual to go with the audio.

### 3/5 — Great Sounds

*2021-02-26*

Sounds are great...could be improve with more selections.

## Frequently asked questions about Pero

### What types of sounds does Pero offer?

Pero offers a variety of white noise sounds inspired by nature, including spring rains, thunderstorms, oceans, nights, summer cicadas, temples, forests, waterfalls, and wheat waves.

### Who can benefit from using Pero?

Pero is suitable for people who want to focus on studying and working, those suffering from insomnia, individuals in noisy environments, anxious or mentally exhausted people, and meditation practitioners.

### Does Pero have ads?

No, Pero does not contain advertisements, providing an uninterrupted listening experience.

### What devices is Pero available on?

Pero is available on Mac, iPhone, and iPod devices.

### How often is Pero updated?

The latest version of Pero is 1.2.0, which was last updated on February 17, 2021. This indicates a moderate update frequency.

### What is the age rating for Pero?

Pero has an age rating of 4+, making it suitable for a wide range of users.

### Is Pero free to download?

Yes, Pero is free to download and use, with optional in-app purchases available.

### What is the user sentiment for Pero based on ratings?

Pero has a perfect rating of 5.0 stars from 4 ratings, suggesting very positive user sentiment.

## Version history (last 3 releases)

### 1.2.0 — 2021-02-17

- 修复已知问题

### 1.1.0 — 2021-02-01

- 修复已知问题

### 1.0 — 2021-01-13

No release notes.

## Apps similar to Pero

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Avrora Sleep Sounds & Stories](https://appshunter.io/ios/app/avrora-sleep-sounds-and-stories/id1441091033) | 4.5 (17,920) | Free | Health & Fitness |
| [Sleep Sounds White Noise, Rain](https://appshunter.io/ios/app/sleep-sounds-white-noise-rain/id1453508270) | 4.8 (34,025) | Free | Health & Fitness |
| [Sleepi: Sounds to Sleep Well](https://appshunter.io/ios/app/sleepi-sounds-to-sleep-well/id1507018513) | 4.7 (378) | Free | Health & Fitness |
| [Sleep Sounds & White Noise](https://appshunter.io/ios/app/sleep-sounds-and-white-noise/id1148312559) | 4.5 (283) | Free | Health & Fitness |
| [BetterSleep: Relax and Sleep](https://appshunter.io/ios/app/bettersleep-relax-and-sleep/id314498713) | 4.7 (390,474) | Free | Health & Fitness |
| [Sleepwave: Alarm & Tracker](https://appshunter.io/ios/app/sleepwave-alarm-and-tracker/id1565509007) | 4.7 (6,410) | Free | Health & Fitness |

## More apps by 凯 刘

- [最日记 - 私密日记本](https://appshunter.io/ios/app/id1466227602)
- [小森林 - 提升专注改善睡眠](https://appshunter.io/ios/app/id1493965843)

All apps by 凯 刘: https://appshunter.io/developer/995766911

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-13.*