# Digit Invader Calculator vs Stellar Crusade

The clearest difference is iOS requirement: Stellar Crusade at 13.0 against Digit Invader Calculator's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Digit Invader Calculator ships an update every 9 days, Stellar Crusade weekly. The most recent releases landed on October 22, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Digit Invader Calculator | Stellar Crusade |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (9 ratings)](https://appshunter.io/ios/app/digit-invader-calculator/id6743176325/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Weekly** |
| Monetization | Free | — |
| Size | 5 MB | 26 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Fu Keung Kwan](https://appshunter.io/developer/1801804499) | [Mikhail Sevbo](https://appshunter.io/developer/1802268312) |

## What reviewers say

### Digit Invader Calculator

[App page](https://appshunter.io/ios/app/digit-invader-calculator/id6743176325)

This app combines a functional calculator with a retro arcade game inspired by classic calculator interfaces. It offers automatic game saving, a high score list, and multitasking support on iPads. A scaled-down version is also available for Apple Watch.

**Highlights:** Retro calculator game, Basic calculator functions, Automatic game save, High score list, iPad Stage Manager support, Apple Watch version

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Stellar Crusade

[App page](https://appshunter.io/ios/app/stellar-crusade/id6743364561)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Digit Invader Calculator free?

Digit Invader Calculator is free to download, with no in-app purchases.

### Is Stellar Crusade free?

Stellar Crusade is free to download, with no in-app purchases.

### Do Digit Invader Calculator or Stellar Crusade have ads?

Neither Digit Invader Calculator nor Stellar Crusade shows ads.

### Which is updated more often, Digit Invader Calculator or Stellar Crusade?

Digit Invader Calculator ships an update every 9 days, and Stellar Crusade weekly. Most recently, Digit Invader Calculator was updated on October 22, 2026 and Stellar Crusade on October 4, 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.*