# iPhasematch vs Least Squares Curve Fit

The clearest difference is update cadence: Least Squares Curve Fit at every 8 days against iPhasematch's every 7 months. On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. 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 iPhasematch against 5.0 for Least Squares Curve Fit. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

iPhasematch ships an update every 7 months, Least Squares Curve Fit every 8 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | iPhasematch | Least Squares Curve Fit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/iphasematch/id492370060/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/least-squares-curve-fit/id6443509668/reviews) |
| Number of ratings | **3** | 2 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 8 days** |
| Monetization | Free | Free |
| Size | 6 MB | 7 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


### Least Squares Curve Fit

[App page](https://appshunter.io/ios/app/least-squares-curve-fit/id6443509668)

This app helps users find the best-fit curves for their data points using the Least Squares method. It supports various 2D and 3D function types, reports equations, and draws graphs. Data can be saved for later use.

**Highlights:** Least Squares Linear Regression Method, Multiple 2D and 3D function types, Equation reporting, Graph visualization, Data point storage, Best fit analysis, SVD calculation option

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iPhasematch free?

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

### Is Least Squares Curve Fit free?

Least Squares Curve Fit is free to download, with no in-app purchases.

### Which has better reviews, iPhasematch or Least Squares Curve Fit?

iPhasematch and Least Squares Curve Fit are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do iPhasematch or Least Squares Curve Fit have ads?

Neither iPhasematch nor Least Squares Curve Fit shows ads.

### Which is updated more often, iPhasematch or Least Squares Curve Fit?

iPhasematch ships an update every 7 months, and Least Squares Curve Fit every 8 days. Most recently, iPhasematch was updated on November 1, 2026 and Least Squares Curve Fit on November 3, 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.*