# Phase Calc vs NMPP Operations

The clearest difference is price: NMPP Operations at Free against Phase Calc's $1.99. NMPP Operations also leads on iOS requirement (14.1 vs 17.0). Phase Calc's advantage is update cadence (every 6 weeks vs every 10 months) and ratings volume (4 vs 1). On rating, ads, in-app purchases and device support there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Phase Calc against 5.0 for NMPP Operations. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Phase Calc ships an update every 6 weeks, NMPP Operations every 10 months. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Phase Calc | NMPP Operations |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/phase-calc/id837266300/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/nmpp-operations/id1571982454/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 10 months |
| Monetization | Paid | **Free** |
| Size | 13 MB | 110 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) | [Nebraska Municipal Power Pool](https://appshunter.io/developer/1571982696) |

## 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


### NMPP Operations

[App page](https://appshunter.io/ios/app/nmpp-operations/id1571982454)

This app facilitates mutual aid requests by connecting users with a coordinator for equipment and personnel needs. It also allows for quick reporting of system outages and notification of municipal generation operations to stakeholders.

**Highlights:** Mutual aid request submission, Direct contact with coordinator, System outage reporting, Generation notification, Resource tracking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Phase Calc free?

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

### Is NMPP Operations free?

NMPP Operations is free to download, with no in-app purchases.

### Which has better reviews, Phase Calc or NMPP Operations?

Phase Calc and NMPP Operations are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do Phase Calc or NMPP Operations have ads?

Neither Phase Calc nor NMPP Operations shows ads.

### Which is updated more often, Phase Calc or NMPP Operations?

Phase Calc ships an update every 6 weeks, and NMPP Operations every 10 months. Most recently, Phase Calc was updated on October 15, 2026 and NMPP Operations on October 2, 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.*