# Digit Invader Calculator vs Sky Ace 3D

The clearest difference is in-app purchases: Digit Invader Calculator at none against Sky Ace 3D's 1. Digit Invader Calculator also leads on ratings volume (10 vs 1). Sky Ace 3D's advantage is update cadence (every 3 days vs every 9 days) and rating (5.0 vs 4.8). On price, ads and device support there is nothing between them.

Both are free to download. Sky Ace 3D sells 1 one-off in-app purchase. Digit Invader Calculator asks for nothing beyond the download.

Sky Ace 3D holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Digit Invader Calculator has 10 ratings behind it against 1, so its average is the more settled of the two.

Digit Invader Calculator ships an update every 9 days, Sky Ace 3D every 3 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Digit Invader Calculator | Sky Ace 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (10 ratings)](https://appshunter.io/ios/app/digit-invader-calculator/id6743176325/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sky-ace-3d/id6757394576/reviews)** |
| Number of ratings | **10** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 5 MB | 9 MB |
| Requires iOS | 17.6 | **11** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Fu Keung Kwan](https://appshunter.io/developer/1801804499) | [Catalin Berta](https://appshunter.io/developer/1592833249) |

## 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


### Sky Ace 3D

[App page](https://appshunter.io/ios/app/sky-ace-3d/id6757394576)

Engage in thrilling 3D aerial combat directly on your Apple Watch. Maneuver through enemy fire, track targets, and battle bosses in fast-paced dogfights with intuitive one-handed controls.

**Highlights:** Real-time 3D aerial combat, Digital Crown controls, Fast dogfights, Progressive challenge, Optimized for Apple Watch

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Game Access | $0.99 | one-time |


## Frequently asked questions

### Is Digit Invader Calculator free?

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

### Is Sky Ace 3D free?

Sky Ace 3D is free to download, with in-app purchases available.

### Which has better reviews, Digit Invader Calculator or Sky Ace 3D?

Sky Ace 3D is rated higher. Digit Invader Calculator averages 4.8 out of 5 from 10 ratings, while Sky Ace 3D averages 5.0 from 1 ratings.

### Do Digit Invader Calculator or Sky Ace 3D have ads?

Neither Digit Invader Calculator nor Sky Ace 3D shows ads.

### Which is updated more often, Digit Invader Calculator or Sky Ace 3D?

Digit Invader Calculator ships an update every 9 days, and Sky Ace 3D every 3 days. Most recently, Digit Invader Calculator was updated on October 24, 2026 and Sky Ace 3D 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.*