# GroundRollCalc vs Q400

The clearest difference is update cadence: GroundRollCalc at every 5 days against Q400's every 5 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. GroundRollCalc sells 3 in-app purchases, starting at $0.99 per month and Q400 sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

GroundRollCalc ships an update every 5 days, Q400 every 5 months. The most recent releases landed on November 8, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | GroundRollCalc | Q400 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 5 months |
| Size | 185 MB | 10 MB |
| Requires iOS | **18.5** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rob Honeycutt](https://appshunter.io/developer/1820512480) | [MacLaren's Studio](https://appshunter.io/developer/549588446) |

## What reviewers say

### GroundRollCalc

[App page](https://appshunter.io/ios/app/groundrollcalc/id6747908402)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GroundRollCalc Pro Monthly | $0.99 | per month |
| GroundRollCalc Pro Yearly | $9.99 | per year |
| Unlock Live GPS | $5.99 | one-time |


### Q400

[App page](https://appshunter.io/ios/app/q400-performance/id6758963990)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is GroundRollCalc free?

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

### Is Q400 free?

Q400 is free to download, with in-app purchases available.

### Do GroundRollCalc or Q400 have ads?

Neither GroundRollCalc nor Q400 shows ads.

### Which is updated more often, GroundRollCalc or Q400?

GroundRollCalc ships an update every 5 days, and Q400 every 5 months. Most recently, GroundRollCalc was updated on November 8, 2026 and Q400 on November 9, 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.*