# VistaCCD vs RaceBuddy Overlay

The clearest difference is in-app purchases: VistaCCD at none against RaceBuddy Overlay's 3. VistaCCD also leads on update cadence (fortnightly vs every 5 months) and iOS requirement (8.0 vs 26.2). On price, ads and device support there is nothing between them.

Both are free to download. RaceBuddy Overlay sells 3 in-app purchases, starting at $1.99 per month. VistaCCD asks for nothing beyond the download.

VistaCCD ships an update fortnightly, RaceBuddy Overlay every 5 months. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | VistaCCD | RaceBuddy Overlay |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 months |
| Monetization | Free | — |
| Size | 7 MB | 37 MB |
| Requires iOS | **8.0** | 26.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kal Designs Ltd](https://appshunter.io/developer/521728838) | [Imperio](https://appshunter.io/developer/521569345) |

## What reviewers say

### VistaCCD

[App page](https://appshunter.io/ios/app/vistaccd/id521728835)

This utility app assists engineers in the preliminary design of turbo compressor impellers. It calculates key dimensions and efficiency based on user-defined performance targets and inlet conditions, offering visual feedback for optimization.

**Highlights:** Preliminary turbo compressor impeller design, Key dimensions and efficiency calculation, Meanline design calculation, Reynolds number and tip clearance correction, Visual feedback for optimization, 2D impeller sketch

**Features:** macOS Compatibility

**In-app purchases:** none


### RaceBuddy Overlay

[App page](https://appshunter.io/ios/app/racebuddy-overlay/id6760262505)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly PRO | $1.99 | per month |
| Yearly | $9.99 | per year |
| Lifetime | $19.99 | one-time |


## Frequently asked questions

### Is VistaCCD free?

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

### Is RaceBuddy Overlay free?

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

### Do VistaCCD or RaceBuddy Overlay have ads?

Neither VistaCCD nor RaceBuddy Overlay shows ads.

### Which is updated more often, VistaCCD or RaceBuddy Overlay?

VistaCCD ships an update fortnightly, and RaceBuddy Overlay every 5 months. Most recently, VistaCCD was updated on November 1, 2026 and RaceBuddy Overlay 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.*