# Gridphase vs Transformer Calculation Tool

The clearest difference is in-app purchases: Gridphase at none against Transformer Calculation Tool's 1. Transformer Calculation Tool's advantage is update cadence (every 4 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Gridphase ships an update every 3 months, Transformer Calculation Tool every 4 weeks. The most recent releases landed on September 30, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Gridphase | Transformer Calculation Tool |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Size | 57 MB | 57 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [GRID INSTRUMENTS d.o.o.](https://appshunter.io/developer/1711794018) | [Shraddhaben Parmar](https://appshunter.io/developer/1889769325) |

## What reviewers say

### Gridphase

[App page](https://appshunter.io/ios/app/gridphase/id6469338974)

**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 Gridphase free?

Gridphase 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 Gridphase or Transformer Calculation Tool have ads?

Neither Gridphase nor Transformer Calculation Tool shows ads.

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

Gridphase ships an update every 3 months, and Transformer Calculation Tool every 4 weeks. Most recently, Gridphase was updated on September 30, 2026 and Transformer Calculation Tool on October 3, 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.*