# Sonic | Water Eject vs STUDIO 21

The clearest difference is review sentiment: Sonic | Water Eject at 81% against STUDIO 21's 35%. Sonic | Water Eject also leads on ratings volume (21K vs 9) and update cadence (every 2 weeks vs every 6 weeks). STUDIO 21's advantage is in-app purchases (none vs 9) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Sonic | Water Eject sells 9 in-app purchases, starting at $1.99 per 7 days. STUDIO 21 asks for nothing beyond the download.

STUDIO 21 holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Sonic | Water Eject has 21K ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 81% of Sonic | Water Eject's written reviews are positive against 35% of STUDIO 21's, so the app with the better star average is not the one people write more warmly about.

Sonic | Water Eject ships an update every 2 weeks, STUDIO 21 every 6 weeks. The most recent releases landed on October 14, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Sonic | Water Eject | STUDIO 21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (21K ratings)](https://appshunter.io/ios/app/sonic-water-eject/id986999895/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/studio-21/id1352380483/reviews)** |
| Number of ratings | **21K** | 9 |
| Positive reviews | **81.3% of reviews** | 34.5% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Freemium | **Free** |
| Best chart rank | **#183** | — |
| Size | 50 MB | 31 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VonBruno LLC](https://appshunter.io/developer/346742389) | [Evropeiskaya Media Gruppa](https://appshunter.io/developer/1018383613) |

## What reviewers say

### Sonic | Water Eject

[App page](https://appshunter.io/ios/app/sonic-water-eject/id986999895)

**Currently charting:** #183 Top Free · Music (US App Store)

This app generates precise sine wave tones to help remove water and debris from your device's speakers. Easily adjust frequencies by swiping on the screen, and enjoy features like Apple Watch control and background operation. Premium subscribers gain access to advanced waveforms, unlimited sessions, and an ad-free experience.

**Highlights:** Clears moisture from device speakers, Generates tones from 0 Hz to 25 kHz, Control via Apple Watch, Background operation, Broadcast to Bluetooth/Airplay speakers, Unique waveforms (Premium)

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $1.99 | per 7 days |
| Monthly | $2.99 | per month |
| Weekly | $2.99 | per 7 days |
| Annual | $9.99 | per year |
| Annual | $29.99 | per year |
| Sonic Clean | $0.99 | one-time |
| Sonic Presets | $2.99 | one-time |
| Sonic Waveforms | $2.99 | one-time |
| Lifetime | $24.99 | one-time |

**What reviewers like**

- 🚀 Works great for water ejection
- 🔧 Effectively removes water from speakers
- 👍 Saved phones from water damage
- 💡 Useful for tuning instruments and sound healing

**What reviewers complain about**

- 🔒 Premium features now behind paywall
- 💰 Subscription model too expensive
- 🔇 Ads interfere with usability
- 🐛 Frequency controls not user-friendly

**Reported bugs**

- Frequency controls fixed at 530Hz in some versions
- Close button not responsive in some cases

**Requested features**

- Add volume control to play in background
- Provide manual frequency input option
- Implement binaural beat feature


### STUDIO 21

[App page](https://appshunter.io/ios/app/studio-21/id1352380483)

Enjoy a 24/7 stream of hip-hop music, featuring both international and Russian-speaking artists. Tune in for talk shows and exclusive segments with popular guests and resident hosts.

**Highlights:** 24/7 hip-hop music stream, International and Russian artists, Talk shows and discussion programs, Guest appearances, Resident host segments

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sonic | Water Eject free?

Sonic | Water Eject is free to download, with in-app purchases available.

### Is STUDIO 21 free?

STUDIO 21 is free to download, with no in-app purchases.

### Which has better reviews, Sonic | Water Eject or STUDIO 21?

STUDIO 21 is rated higher. Sonic | Water Eject averages 4.7 out of 5 from 21K ratings, while STUDIO 21 averages 5.0 from 9 ratings.

### Do Sonic | Water Eject or STUDIO 21 have ads?

Sonic | Water Eject shows ads; STUDIO 21 does not.

### Which is updated more often, Sonic | Water Eject or STUDIO 21?

Sonic | Water Eject ships an update every 2 weeks, and STUDIO 21 every 6 weeks. Most recently, Sonic | Water Eject was updated on October 14, 2026 and STUDIO 21 on October 8, 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.*