# iPhasematch vs Polynomial Regression

The clearest difference is update cadence: Polynomial Regression at every 3 weeks against iPhasematch's every 7 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

iPhasematch ships an update every 7 months, Polynomial Regression every 3 weeks. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | iPhasematch | Polynomial Regression |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/iphasematch/id492370060/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 6 MB | 4 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yushi Kaneda](https://appshunter.io/developer/492370063) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### iPhasematch

[App page](https://appshunter.io/ios/app/iphasematch/id492370060)

Calculate nonlinear optical effects like second-harmonic generation and spontaneous parametric down-conversion. This app provides phasematching orientations, nonlinear coefficients, and tolerance values for various crystals based on Sellmeier equations.

**Highlights:** Phasematching condition calculation, Sellmeier equation integration, Effective nonlinear optical coefficients, Walk-off and angular tolerance, Temperature tolerance, Supported crystal list

**Features:** macOS Compatibility

**In-app purchases:** none


### Polynomial Regression

[App page](https://appshunter.io/ios/app/polynomial-regression/id6741364702)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iPhasematch free?

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

### Is Polynomial Regression free?

Polynomial Regression is free to download, with no in-app purchases.

### Do iPhasematch or Polynomial Regression have ads?

Neither iPhasematch nor Polynomial Regression shows ads.

### Which is updated more often, iPhasematch or Polynomial Regression?

iPhasematch ships an update every 7 months, and Polynomial Regression every 3 weeks. Most recently, iPhasematch was updated on October 7, 2026 and Polynomial Regression 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.*