# Grain Moisture vs Rock Finder

The clearest difference is price: Rock Finder at Free against Grain Moisture's $2.99. Rock Finder also leads on update cadence (every 3 weeks vs every 7 months). Grain Moisture's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Rock Finder is free to download; Grain Moisture costs $2.99 up front. Rock Finder sells 1 in-app purchase, starting at $24.99 per year. Grain Moisture asks for nothing beyond the download.

Grain Moisture ships an update every 7 months, Rock Finder every 3 weeks. The most recent releases landed on November 11, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Grain Moisture | Rock Finder |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rock-finder/id6744333994/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 10 MB | 45 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sheila Elder](https://appshunter.io/developer/1105155338) | [CARTER RONALD PETERSON](https://appshunter.io/developer/1807128604) |

## What reviewers say

### Grain Moisture

[App page](https://appshunter.io/ios/app/grain-moisture/id1105155339)

Calculate grain moisture accurately using dial readings and grain temperature. Features over 50 grain types with formulas based on up-to-date Canadian Grain Commission tables. Avoid outdated paper charts with this farmer-developed tool.

**Highlights:** Moisture calculation using dial reading and temperature, Over 50 grain choices, Formulas based on Canadian Grain Commission tables, Replaces outdated paper tables, Developed by farmers

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

**In-app purchases:** none


### Rock Finder

[App page](https://appshunter.io/ios/app/rock-finder/id6744333994)

This app helps farmers and landowners mark, manage, and track rocks on their property using an interactive map. Easily drop pins, edit locations, mark rocks as removed, and organize tasks by field. Collaborate with others by sharing your progress.

**Highlights:** Mark rock locations on a map, Edit and delete pin locations, Mark rocks as removed, Organize rocks by field, Share fields with collaborators, Interactive map interface

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $24.99 | per year |


## Frequently asked questions

### Is Grain Moisture free?

Grain Moisture costs $2.99, with no in-app purchases.

### Is Rock Finder free?

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

### Do Grain Moisture or Rock Finder have ads?

Neither Grain Moisture nor Rock Finder shows ads.

### Which is updated more often, Grain Moisture or Rock Finder?

Grain Moisture ships an update every 7 months, and Rock Finder every 3 weeks. Most recently, Grain Moisture was updated on November 11, 2026 and Rock Finder on October 30, 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.*