# Grid Diagnoze vs Transformer Calculation Tool

The clearest difference is in-app purchases: Grid Diagnoze at none against Transformer Calculation Tool's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Transformer Calculation Tool sells 1 one-off in-app purchase. Grid Diagnoze asks for nothing beyond the download.

Grid Diagnoze ships an update every 3 weeks, Transformer Calculation Tool every 4 weeks. The most recent releases landed on September 15, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Grid Diagnoze | Transformer Calculation Tool |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 weeks |
| Size | 15 MB | 57 MB |
| Requires iOS | 13.4 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Griddiagnoze AB](https://appshunter.io/developer/1485764181) | [Shraddhaben Parmar](https://appshunter.io/developer/1889769325) |

## What reviewers say

### Grid Diagnoze

[App page](https://appshunter.io/ios/app/grid-diagnoze/id1485764182)

**Features:** macOS Compatibility

**In-app purchases:** none


### Transformer Calculation Tool

[App page](https://appshunter.io/ios/app/transformer-calculation-tool/id6772152007)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime premium | $9.99 | one-time |


## Frequently asked questions

### Is Grid Diagnoze free?

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

### Is Transformer Calculation Tool free?

Transformer Calculation Tool is free to download, with in-app purchases available.

### Do Grid Diagnoze or Transformer Calculation Tool have ads?

Neither Grid Diagnoze nor Transformer Calculation Tool shows ads.

### Which is updated more often, Grid Diagnoze or Transformer Calculation Tool?

Grid Diagnoze ships an update every 3 weeks, and Transformer Calculation Tool every 4 weeks. Most recently, Grid Diagnoze was updated on September 15, 2026 and Transformer Calculation Tool on September 16, 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.*