# Idell Duck vs Cosmic Synthesis

The clearest difference is in-app purchases: Idell Duck at none against Cosmic Synthesis's 1. Idell Duck also leads on update cadence (every 3 days vs weekly) and iOS requirement (12.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Cosmic Synthesis sells 1 one-off in-app purchase. Idell Duck asks for nothing beyond the download.

Idell Duck ships an update every 3 days, Cosmic Synthesis weekly. The most recent releases landed on May 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Idell Duck | Cosmic Synthesis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.8 (12 ratings)](https://appshunter.io/ios/app/cosmic-synthesis-idle-builder/id6756239498/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 28.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 62 MB | 150 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kyrylo Salata](https://appshunter.io/developer/1761035881) | [NETBYTE UG (haftungsbeschränkt)](https://appshunter.io/developer/1854412817) |

## What reviewers say

### Idell Duck

[App page](https://appshunter.io/ios/app/idell-duck-egg-farm-clicker/id6605936309)

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Idell Duck free?

Idell Duck is free to download, with no in-app purchases.

### Is Cosmic Synthesis free?

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

### Do Idell Duck or Cosmic Synthesis have ads?

Both Idell Duck and Cosmic Synthesis show ads.

### Which is updated more often, Idell Duck or Cosmic Synthesis?

Idell Duck ships an update every 3 days, and Cosmic Synthesis weekly. Most recently, Idell Duck was updated on May 17, 2026 and Cosmic Synthesis on September 18, 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.*