# Phase Calc vs Plant Activity Tracking App

The clearest difference is price: Plant Activity Tracking App at Free against Phase Calc's $1.99. Plant Activity Tracking App also leads on iOS requirement (15.0 vs 17.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Plant Activity Tracking App 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, Plant Activity Tracking App every 3 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Phase Calc | Plant Activity Tracking App |
| --- | --- | --- |
| 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 3 months |
| Monetization | Paid | — |
| Size | 13 MB | 42 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Donnie Herman](https://appshunter.io/developer/837266303) | [Siemens Energy](https://appshunter.io/developer/1539380213) |

## 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


### Plant Activity Tracking App

[App page](https://appshunter.io/ios/app/plant-activity-tracking-app/id1585340320)

**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 Plant Activity Tracking App free?

Plant Activity Tracking App is free to download, with no in-app purchases.

### Do Phase Calc or Plant Activity Tracking App have ads?

Neither Phase Calc nor Plant Activity Tracking App shows ads.

### Which is updated more often, Phase Calc or Plant Activity Tracking App?

Phase Calc ships an update every 6 weeks, and Plant Activity Tracking App every 3 months. Most recently, Phase Calc was updated on October 15, 2026 and Plant Activity Tracking App on October 13, 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.*