# Nano Wars! vs Once Upon A Solitaire

The clearest difference is ads: Once Upon A Solitaire at none against Nano Wars!'s shown. Nano Wars!'s advantage is update cadence (daily vs every 11 days) and iOS requirement (13.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Nano Wars! ships an update daily, Once Upon A Solitaire every 11 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Nano Wars! | Once Upon A Solitaire |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/nano-wars/id6754985312/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Daily** | Every 11 days |
| Monetization | Ad-supported | — |
| Size | 179 MB | 287 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Ristretto Studios](https://appshunter.io/developer/1586604222) | [Fizzle Pop](https://appshunter.io/developer/1839141856) |

## What reviewers say

### Nano Wars!

[App page](https://appshunter.io/ios/app/nano-wars/id6754985312)

Defend your system from invading microbes in this fast-paced tower defense game. Deploy units, use powerful medicine, and expand your defenses to push back infections. Collect molecules and upgrade your units to win the war.

**Highlights:** Rapid-fire tower defense gameplay, Unique immune system and medical abilities, Zone expansion for enemy path control, Molecule collection for evolution, Meta upgrades for new units

**Features:** macOS Compatibility

**In-app purchases:** none


### Once Upon A Solitaire

[App page](https://appshunter.io/ios/app/once-upon-a-solitaire/id6760764125)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Nano Wars! free?

Nano Wars! is free to download, with no in-app purchases.

### Is Once Upon A Solitaire free?

Once Upon A Solitaire is free to download, with no in-app purchases.

### Do Nano Wars! or Once Upon A Solitaire have ads?

Nano Wars! shows ads; Once Upon A Solitaire does not.

### Which is updated more often, Nano Wars! or Once Upon A Solitaire?

Nano Wars! ships an update daily, and Once Upon A Solitaire every 11 days. Most recently, Nano Wars! was updated on November 5, 2026 and Once Upon A Solitaire on October 31, 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.*