# GT Graph vs Dozenal Calc

The clearest difference is in-app purchases: Dozenal Calc at none against GT Graph's 1. Dozenal Calc also leads on update cadence (every 3 days vs every 8 days) and device support (5 vs 3). On price and ads there is nothing between them.

Both are free to download. GT Graph sells 1 one-off in-app purchase. Dozenal Calc asks for nothing beyond the download.

GT Graph ships an update every 8 days, Dozenal Calc every 3 days. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | GT Graph | Dozenal Calc |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 3 days** |
| Size | 1 MB | 32 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad, Mac | **iPhone, iPad, iPod, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Gennaro Eduardo Tangari](https://appshunter.io/developer/1616502345) | [Eric Naville](https://appshunter.io/developer/6777149198) |

## What reviewers say

### GT Graph

[App page](https://appshunter.io/ios/app/gt-graph/id6757393417)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| GT Graph In-App Purchase | $0.99 | one-time |


### Dozenal Calc

[App page](https://appshunter.io/ios/app/dozenal-calc/id6777149196)

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is GT Graph free?

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

### Is Dozenal Calc free?

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

### Do GT Graph or Dozenal Calc have ads?

Neither GT Graph nor Dozenal Calc shows ads.

### Which is updated more often, GT Graph or Dozenal Calc?

GT Graph ships an update every 8 days, and Dozenal Calc every 3 days. Most recently, GT Graph was updated on October 8, 2026 and Dozenal Calc on October 24, 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.*