# StraboTools vs Slope Calculator Plus

The clearest difference is price: StraboTools at Free against Slope Calculator Plus's $2.99. StraboTools also leads on update cadence (every 2 months vs every 23 months) and iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

StraboTools is free to download; Slope Calculator Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

StraboTools ships an update every 2 months, Slope Calculator Plus every 23 months. The most recent releases landed on June 4, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | StraboTools | Slope Calculator Plus |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (10 ratings)](https://appshunter.io/ios/app/strabotools/id1496239162/reviews)** | — |
| Number of ratings | **10** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 23 months |
| Monetization | Free | — |
| Size | 14 MB | 1 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [The University of Kansas](https://appshunter.io/developer/726307325) | [Heng Jia Liang](https://appshunter.io/developer/1532000635) |

## What reviewers say

### StraboTools

[App page](https://appshunter.io/ios/app/strabotools/id1496239162)

This app assists geologists in the field by analyzing photographs to provide quantitative data on rock fabric and mineral composition. It offers tools for measuring fabric orientation, determining color index, and detecting edges in rock images.

**Highlights:** Edge Fabric tool for orientation analysis, Color Index tool for mineral composition, Edge detection filter, Analyzes photos in-app or imported, Useful for plutonic and other rock types, Supports thin section study

**Features:** macOS Compatibility

**In-app purchases:** none


### Slope Calculator Plus

[App page](https://appshunter.io/ios/app/slope-calculator-plus/id1627653061)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is StraboTools free?

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

### Is Slope Calculator Plus free?

Slope Calculator Plus costs $2.99, with no in-app purchases.

### Do StraboTools or Slope Calculator Plus have ads?

Neither StraboTools nor Slope Calculator Plus shows ads.

### Which is updated more often, StraboTools or Slope Calculator Plus?

StraboTools ships an update every 2 months, and Slope Calculator Plus every 23 months. Most recently, StraboTools was updated on June 4, 2026 and Slope Calculator Plus on September 23, 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.*