# Cosmic Synthesis vs Echo Planet

The clearest difference is review sentiment: Echo Planet at 100% against Cosmic Synthesis's 29%. Echo Planet also leads on rating (4.9 vs 4.0) and update cadence (every 3 days vs weekly). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Cosmic Synthesis sells 1 one-off in-app purchase and Echo Planet sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Echo Planet holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 15 and 23 respectively. Written reviews point the same way: 29% of Cosmic Synthesis's written reviews are positive against 100% of Echo Planet's.

Cosmic Synthesis ships an update weekly, Echo Planet every 3 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Cosmic Synthesis | Echo Planet |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (15 ratings)](https://appshunter.io/ios/app/cosmic-synthesis-idle-builder/id6756239498/reviews) | **[4.9 (23 ratings)](https://appshunter.io/ios/app/echo-planet-incremental-game/id6756530491/reviews)** |
| Number of ratings | 15 | **23** |
| Positive reviews | 28.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Weekly | **Every 3 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 161 MB | 96 MB |
| Requires iOS | **15.6** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NETBYTE UG (haftungsbeschränkt)](https://appshunter.io/developer/1854412817) | [Mustafa Mohammed](https://appshunter.io/developer/967586964) |

## What reviewers say

### Cosmic Synthesis

[App page](https://appshunter.io/ios/app/cosmic-synthesis-idle-builder/id6756239498)

Build your own universe from atoms to galaxies in this idle-clicker adventure. Automate production, refine resources, and unlock cosmic milestones. The game adapts to both active strategists and idle players, offering a unique sci-fi experience.

**Highlights:** Tap to generate matter, Automate production chains, Refine resources into planets, Unlock over 50 cosmic milestones, Strategic talent tree, Prestige system for permanent upgrades, Offline progression

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | one-time |


### Echo Planet

[App page](https://appshunter.io/ios/app/echo-planet-incremental-game/id6756530491)

Transform a planet into a star by forging moons that channel power to its core. Upgrade your celestial bodies, stack multipliers, and witness your energy output grow exponentially, even when you're not actively playing. This idle game offers a satisfying progression from small sparks to galaxy-scale power.

**Highlights:** Forge moons to power a planetary core, Upgrade moons and stack multipliers, Idle progression, play offline, Watch signal surge from sparks to galaxy-scale, Transform planet into a star

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gold Supporter Pack | $2.99 | one-time |
| Diamond Supporter Pack | $5.99 | one-time |


## Frequently asked questions

### Is Cosmic Synthesis free?

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

### Is Echo Planet free?

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

### Which has better reviews, Cosmic Synthesis or Echo Planet?

Echo Planet is rated higher. Cosmic Synthesis averages 4.0 out of 5 from 15 ratings, while Echo Planet averages 4.9 from 23 ratings.

### Do Cosmic Synthesis or Echo Planet have ads?

Both Cosmic Synthesis and Echo Planet show ads.

### Which is updated more often, Cosmic Synthesis or Echo Planet?

Cosmic Synthesis ships an update weekly, and Echo Planet every 3 days. Most recently, Cosmic Synthesis was updated on October 25, 2026 and Echo Planet on October 24, 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.*