# Grain Calculator vs Simple GPS Speed

The clearest difference is in-app purchases: Simple GPS Speed at none against Grain Calculator's 2. Simple GPS Speed also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Grain Calculator sells 2 in-app purchases, starting at $2.99 per month. Simple GPS Speed asks for nothing beyond the download.

Grain Calculator ships an update monthly, Simple GPS Speed every 2 weeks. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Grain Calculator | Simple GPS Speed |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 2 weeks** |
| Size | 55 MB | 5 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Andrii Karavan](https://appshunter.io/developer/1751942401) | [ALF STEINBACH](https://appshunter.io/developer/1749287704) |

## What reviewers say

### Grain Calculator

[App page](https://appshunter.io/ios/app/grain-calculator/id6504358520)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly | $2.99 | per month |
| Premium annual | $14.99 | per year |


### Simple GPS Speed

[App page](https://appshunter.io/ios/app/simple-gps-speed/id6560113245)

**In-app purchases:** none


## Frequently asked questions

### Is Grain Calculator free?

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

### Is Simple GPS Speed free?

Simple GPS Speed is free to download, with no in-app purchases.

### Do Grain Calculator or Simple GPS Speed have ads?

Grain Calculator shows ads; Simple GPS Speed does not.

### Which is updated more often, Grain Calculator or Simple GPS Speed?

Grain Calculator ships an update monthly, and Simple GPS Speed every 2 weeks. Most recently, Grain Calculator was updated on October 1, 2026 and Simple GPS Speed on October 14, 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.*