# Polymer AI vs Grainfall

The clearest difference is in-app purchases: Polymer AI at none against Grainfall's 6. Polymer AI also leads on update cadence (weekly vs fortnightly) and iOS requirement (15.1 vs 17.0). Grainfall's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Grainfall sells 6 one-off in-app purchases. Polymer AI asks for nothing beyond the download.

Polymer AI ships an update weekly, Grainfall fortnightly. The most recent releases landed on October 11, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Polymer AI | Grainfall |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/polymer-ai/id6759531446/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Fortnightly |
| Monetization | Ad-supported | — |
| Size | 67 MB | 17 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 9+ | 4+ |
| Developer | [Dunn-Carabali LLC](https://appshunter.io/developer/312739826) | [Hrdlicka Apps LLC](https://appshunter.io/developer/1896342974) |

## What reviewers say

### Polymer AI

[App page](https://appshunter.io/ios/app/polymer-ai/id6759531446)

Build a cyberpunk AI startup from a basement to a global mega-corp. Manage exponential growth, infrastructure, and research while navigating real-time tactical challenges and a deep narrative. Compete with rivals and climb leaderboards in this idle strategy game.

**Highlights:** Empire building from basement to mega-corp, Exponential economy and infrastructure management, Unlock 20+ strategic technologies, Real-time tactical mini-games, Deep cyberpunk narrative with 40+ chapters, Offline progression, PvP hacking and global leaderboards

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

**In-app purchases:** none


### Grainfall

[App page](https://appshunter.io/ios/app/grainfall/id6773977789)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 25 Coins | $0.99 | one-time |
| Starter Pack — 120 Coins | $1.99 | one-time |
| 90 Coins | $2.99 | one-time |
| Premium Unlock | $3.99 | one-time |
| 175 Coins | $4.99 | one-time |
| 400 Coins | $9.99 | one-time |


## Frequently asked questions

### Is Polymer AI free?

Polymer AI is free to download, with no in-app purchases.

### Is Grainfall free?

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

### Do Polymer AI or Grainfall have ads?

Polymer AI shows ads; Grainfall does not.

### Which is updated more often, Polymer AI or Grainfall?

Polymer AI ships an update weekly, and Grainfall fortnightly. Most recently, Polymer AI was updated on October 11, 2026 and Grainfall on October 16, 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.*