# Planet Formula vs SoundEcho

The clearest difference is rating: Planet Formula at 5.0 against SoundEcho's 4.3. Planet Formula also leads on device support (4 vs 2) and iOS requirement (13.0 vs 17.0). SoundEcho's advantage is ads (none vs shown) and monetization model (free vs free with in-app purchases). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Planet Formula sells 3 one-off in-app purchases and SoundEcho sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Planet Formula holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Planet Formula ships an update every 2 months, SoundEcho every 5 weeks. The most recent releases landed on October 9, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Planet Formula | SoundEcho |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/planet-formula/id1563592534/reviews)** | [4.3 (3 ratings)](https://appshunter.io/ios/app/soundecho/id1639116371/reviews) |
| Number of ratings | 3 | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 20 MB | 7 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [x2line.com LLC](https://appshunter.io/developer/425135293) | [Kristof Nijs](https://appshunter.io/developer/1608072573) |

## What reviewers say

### Planet Formula

[App page](https://appshunter.io/ios/app/planet-formula/id1563592534)

Embark on a celestial match-3 adventure across the Solar System. Solve 125 unique puzzles by earning points, breaking ice, or collecting coins within a limited number of moves. Utilize powerful planet combinations and strategic moves to overcome challenges.

**Highlights:** 125 unique match-3 levels, Special power-up planets, Strategic move mechanics, Ice tile and wall breaking, VoiceOver accessibility, T-chain and L-chain combinations

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Extra 4 Moves | $1.99 | one-time |
| Extra 8 Moves | $2.99 | one-time |
| Extra 15 Moves | $3.99 | one-time |


### 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 |


## Frequently asked questions

### Is Planet Formula free?

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

### Is SoundEcho free?

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

### Which has better reviews, Planet Formula or SoundEcho?

Planet Formula is rated higher. Planet Formula averages 5.0 out of 5 from 3 ratings, while SoundEcho averages 4.3 from 3 ratings.

### Do Planet Formula or SoundEcho have ads?

Planet Formula shows ads; SoundEcho does not.

### Which is updated more often, Planet Formula or SoundEcho?

Planet Formula ships an update every 2 months, and SoundEcho every 5 weeks. Most recently, Planet Formula was updated on October 9, 2026 and SoundEcho on September 25, 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.*