# TerrainHub vs Field Sentinel Mapper

The clearest difference is in-app purchases: Field Sentinel Mapper at none against TerrainHub's 10. TerrainHub's advantage is update cadence (every 9 days vs every 3 weeks) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. TerrainHub sells 10 in-app purchases, starting at $9.99 per month. Field Sentinel Mapper asks for nothing beyond the download.

TerrainHub ships an update every 9 days, Field Sentinel Mapper every 3 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | TerrainHub | Field Sentinel Mapper |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/terrainhub/id6754611958/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Freemium | — |
| Size | 93 MB | 168 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TerrainHub LLC](https://appshunter.io/developer/1849228108) | [Tech Maven GeoSpatial LLC](https://appshunter.io/developer/1459067502) |

## What reviewers say

### TerrainHub

[App page](https://appshunter.io/ios/app/terrainhub/id6754611958)

Discover over 222,000 outdoor geological sites across 14 categories, including minerals, fossils, and water features. Utilize an AI guide for location-based geological insights and explore with 17 map layers and field tools. Offline maps are available for areas with no service.

**Highlights:** 222,000+ US geological sites, 14 discovery categories, AI Guide for location-based insights, 17 detailed map layers, Offline map downloads, Field tools for exploration, Photo and video analysis

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| TerrainHub PRO | $9.99 | per month |
| TerrainHub PRO | $89.99 | per year |
| 10 AI Photo Credits | $1.99 | one-time |
| 50 AI Text Credits | $2.99 | one-time |
| 10 AI Video Credits | $2.99 | one-time |
| 25 AI Photo Credits | $3.99 | one-time |
| 100 AI Text Credits | $4.99 | one-time |
| 25 AI Video Credits | $5.99 | one-time |
| 50 AI Photo Credits | $6.99 | one-time |
| 50 AI Video Credits | $9.99 | one-time |


### Field Sentinel Mapper

[App page](https://appshunter.io/ios/app/field-sentinel-mapper/id6786338407)

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

**In-app purchases:** none


## Frequently asked questions

### Is TerrainHub free?

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

### Is Field Sentinel Mapper free?

Field Sentinel Mapper is free to download, with no in-app purchases.

### Do TerrainHub or Field Sentinel Mapper have ads?

Neither TerrainHub nor Field Sentinel Mapper shows ads.

### Which is updated more often, TerrainHub or Field Sentinel Mapper?

TerrainHub ships an update every 9 days, and Field Sentinel Mapper every 3 weeks. Most recently, TerrainHub was updated on October 30, 2026 and Field Sentinel Mapper on November 5, 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.*