# SoundEcho vs Blind 20

The clearest difference is in-app purchases: Blind 20 at none against SoundEcho's 1. Blind 20 also leads on rating (4.8 vs 4.3) and ratings volume (25 vs 3). SoundEcho's advantage is ads (none vs shown) and review sentiment (100% vs 90%). On price, device support and iOS requirement there is nothing between them.

Both are free to download. SoundEcho sells 1 one-off in-app purchase. Blind 20 asks for nothing beyond the download.

Blind 20 holds the better App Store score, 4.8 against 4.3. That said, the two scores are not equally well evidenced: Blind 20 has 25 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 100% of SoundEcho's written reviews are positive against 90% of Blind 20's, so the app with the better star average is not the one people write more warmly about.

SoundEcho ships an update every 5 weeks, Blind 20 every 2 weeks. Both last shipped on November 3, 2026.

## The numbers

| Metric | SoundEcho | Blind 20 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (3 ratings)](https://appshunter.io/ios/app/soundecho/id1639116371/reviews) | **[4.8 (25 ratings)](https://appshunter.io/ios/app/blind-20-number-challenge/id6451119689/reviews)** |
| Number of ratings | 3 | **25** |
| Positive reviews | **100.0% of reviews** | 90.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 7 MB | 17 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Kristof Nijs](https://appshunter.io/developer/1608072573) | [Scott Clark](https://appshunter.io/developer/1696654509) |

## What reviewers say

### SoundEcho

[App page](https://appshunter.io/ios/app/soundecho/id1639116371)

A fun and accessible memory game using sound cues. Players match pairs of buttons that produce the same sound to clear the board. Supports multiple sound themes and player counts, with Game Center integration.

**Highlights:** Sound-based memory matching, VoiceOver accessibility, Animal and computer sound themes, Multiple difficulty levels (10, 15, 20 sounds), 2-4 player real-time multiplayer, Game Center integration

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Purchasing the app | $4.49 | one-time |


### Blind 20

[App page](https://appshunter.io/ios/app/blind-20-number-challenge/id6451119689)

Test your strategy and luck by sorting randomly generated numbers from 1 to 999, one at a time, into an ascending list of 20. Compete daily in live challenges against players worldwide and track your progress. Discover hidden secrets and share your achievements.

**Highlights:** Number sorting from 1 to 999, Daily live gaming challenges, Real-time global competition, Leaderboard rankings, Stats and achievements tracking, Intuitive interface, Hidden secrets

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SoundEcho free?

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

### Is Blind 20 free?

Blind 20 is free to download, with no in-app purchases.

### Which has better reviews, SoundEcho or Blind 20?

Blind 20 is rated higher. SoundEcho averages 4.3 out of 5 from 3 ratings, while Blind 20 averages 4.8 from 25 ratings.

### Do SoundEcho or Blind 20 have ads?

Blind 20 shows ads; SoundEcho does not.

### Which is updated more often, SoundEcho or Blind 20?

SoundEcho ships an update every 5 weeks, and Blind 20 every 2 weeks. Most recently, SoundEcho was updated on November 3, 2026 and Blind 20 on November 3, 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.*