# Phase Calc vs Metric Converters

The clearest difference is price: Metric Converters at Free against Phase Calc's $1.99. Metric Converters also leads on iOS requirement (14.1 vs 17.0). Phase Calc's advantage is update cadence (every 6 weeks vs every 38 months). On ads, in-app purchases and device support there is nothing between them.

Metric Converters is free to download; Phase Calc costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Phase Calc ships an update every 6 weeks, Metric Converters every 38 months. The most recent releases landed on October 23, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Phase Calc | Metric Converters |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/phase-calc/id837266300/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 38 months |
| Monetization | Paid | — |
| Size | 13 MB | 20 MB |
| Requires iOS | 17.0 | **14.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | +4 |
| Developer | [Donnie Herman](https://appshunter.io/developer/837266303) | [H Valeur](https://appshunter.io/developer/621824042) |

## What reviewers say

### Phase Calc

[App page](https://appshunter.io/ios/app/phase-calc/id837266300)

This advanced engineering app performs complex electrical calculations for three-phase power systems. It offers tools for students, technicians, and engineers to analyze unbalanced systems, perform sequence transformations, and access reference libraries. Results can be easily exported for documentation and sharing.

**Highlights:** Symmetrical component analysis, Three-phase power system calculations, Phase-to-sequence and sequence-to-phase transformations, Polar and rectangular input support, Specialized calculators and reference libraries, Exportable results for documentation

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

**In-app purchases:** none


### Metric Converters

[App page](https://appshunter.io/ios/app/metric-converters/id1570182170)

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

**In-app purchases:** none


## Frequently asked questions

### Is Phase Calc free?

Phase Calc costs $1.99, with no in-app purchases.

### Is Metric Converters free?

Metric Converters is free to download, with no in-app purchases.

### Do Phase Calc or Metric Converters have ads?

Neither Phase Calc nor Metric Converters shows ads.

### Which is updated more often, Phase Calc or Metric Converters?

Phase Calc ships an update every 6 weeks, and Metric Converters every 38 months. Most recently, Phase Calc was updated on October 23, 2026 and Metric Converters on October 30, 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.*