# Phase Calc vs ODE Solver +

The clearest difference is price: ODE Solver + at Free against Phase Calc's $1.99. ODE Solver + also leads on update cadence (weekly vs every 6 weeks) and iOS requirement (14.0 vs 17.0). Phase Calc's advantage is rating (5.0 vs 3.7) and ads (none vs shown). On ratings volume, in-app purchases and device support there is nothing between them.

ODE Solver + 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 holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 4 and 3 respectively.

Phase Calc ships an update every 6 weeks, ODE Solver + weekly. The most recent releases landed on August 1, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Phase Calc | ODE Solver + |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/phase-calc/id837266300/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/ode-solver-plus/id1549447510/reviews) |
| Number of ratings | **4** | 3 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Paid | **Ad-supported** |
| Size | 13 MB | 11 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Donnie Herman](https://appshunter.io/developer/837266303) | [Takahiko Nakade](https://appshunter.io/developer/1513184888) |

## 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


### ODE Solver +

[App page](https://appshunter.io/ios/app/ode-solver-plus/id1549447510)

This utility app calculates ordinary differential equations using the Runge-Kutta method. It offers a step width of 0.01 for its calculations.

**Highlights:** Ordinary differential equation calculation, Runge-Kutta method, Step width 0.01

**In-app purchases:** none


## Frequently asked questions

### Is Phase Calc free?

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

### Is ODE Solver + free?

ODE Solver + is free to download, with no in-app purchases.

### Which has better reviews, Phase Calc or ODE Solver +?

Phase Calc is rated higher. Phase Calc averages 5.0 out of 5 from 4 ratings, while ODE Solver + averages 3.7 from 3 ratings.

### Do Phase Calc or ODE Solver + have ads?

ODE Solver + shows ads; Phase Calc does not.

### Which is updated more often, Phase Calc or ODE Solver +?

Phase Calc ships an update every 6 weeks, and ODE Solver + weekly. Most recently, Phase Calc was updated on August 1, 2026 and ODE Solver + on September 25, 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.*