# DeepTime for Geology vs Mass.Shift

The clearest difference is in-app purchases: DeepTime for Geology at none against Mass.Shift's 2. Mass.Shift's advantage is iOS requirement (13.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Mass.Shift sells 2 in-app purchases, starting at $0.99 per month. DeepTime for Geology asks for nothing beyond the download.

## The numbers

| Metric | DeepTime for Geology | Mass.Shift |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/deeptime-for-geology/id1500200416/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | — |
| Size | 1 MB | 70 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hunt Mountain Software](https://appshunter.io/developer/328710008) | [ADAVII (PVT) LTD](https://appshunter.io/developer/1711708818) |

## What reviewers say

### DeepTime for Geology

[App page](https://appshunter.io/ios/app/deeptime-for-geology/id1500200416)

Explore an interactive geological time scale with detailed information on each unit, including GSSP definitions and color codes. Search for terms and view GSSPs on a global map. Ideal for geologists, students, and Earth history enthusiasts.

**Highlights:** Interactive geological time scale, Detailed GSSP definitions, CMYK and RGB color codes, Searchable by name or age, Global GSSP map integration, Tips for using time terms

**Features:** Vision Pro support

**In-app purchases:** none


### Mass.Shift

[App page](https://appshunter.io/ios/app/massshift/id6757779133)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MassShift Monthly | $0.99 | per month |
| MassShift Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is DeepTime for Geology free?

DeepTime for Geology is free to download, with no in-app purchases.

### Is Mass.Shift free?

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

### Do DeepTime for Geology or Mass.Shift have ads?

Neither DeepTime for Geology nor Mass.Shift shows ads.

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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.*