# Least Squares Curve Fit — Best approximate curve fitter

> Calculates best-fit curves for data points using the Least Squares method. (iPhone/iPad app by Yuri Morozov.)

- Source: https://appshunter.io/ios/app/least-squares-curve-fit/id6443509668 (this page in markdown: same URL + `.md`)
- Developer: [Yuri Morozov](https://appshunter.io/developer/1582368813)
- Category: Education, Productivity
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 7 MB
- Languages: English
- Released: 2022-09-26
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/least-squares-curve-fit/id6443509668/reviews.md

## What is Least Squares Curve Fit?

“Least Squares Curve Fit” is a user friendly, free of charge and free of ads app.
User inputs point sets and chooses function types.
Utilizing the Least Squares Linear Regression Method, the app calculates best fit curves, reports equations and draws graphs.
Point sets can be stored in a table and are available after app is closed.

Currently available function types are:

2D:
1. Line.
2. Parabola.
3. Polynomial up to 8th degree.
4. Circle.
5. Conic section (Ellipse or Hyperbola).
6. Trigonometric function as  
    C + A1*cos(ω*x) + B1*sin(ω*x) + … + An*cos(n*ω*x) + Bn*sin(n*ω*x), 
    where user can select n between 1 and 8 and enter any ω. 
7. Exponential Function.
8. Bell Curve.

3D:
1. Plane. 
2. Sphere.

Also, there is an option to choose the Best Fit:
the app goes through all the possible shapes and lists them in order from best to worst fit based on residuals.

In some cases, when the standard Least Squares method with orthogonal projection does not work, best fit for Line, Parabola, Polynomial and Trigonometric functions can be calculated with SVD.
 
Links to four other free apps by same developers are included in the app:
1. “Matrix Solver Step by Step” Linear Algebra Visual Guide.
2. “Polynomials and Linear Systems”  Equation Solver.
3. “GraphMath” Graphing Calculator.
4. “Vectors and Planes” (and Spheres and Ellipsoids) 3D Geometry Guide.

Developers hope to get feedback from users at graphmath@aol.com.

## Key features

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


## Frequently asked questions about Least Squares Curve Fit

### What is Least Squares Curve Fit?

Least Squares Curve Fit is a free application that utilizes the Least Squares Linear Regression Method to calculate the best-fit curves for user-inputted point sets. It reports the resulting equations and draws graphs, with data being savable for future use.

### What function types does Least Squares Curve Fit support?

The app supports a variety of 2D functions including Line, Parabola, Polynomials up to 8th degree, Circle, Conic sections, Trigonometric functions, Exponential, and Bell Curves. It also supports 3D functions like Plane and Sphere.

### Can Least Squares Curve Fit find the absolute best fit for my data?

Yes, the app has an option to choose the 'Best Fit' by evaluating all possible shapes and listing them from best to worst based on residuals. This helps users identify the most accurate representation of their data.

### Does Least Squares Curve Fit have ads?

No, Least Squares Curve Fit is completely free of charge and free of ads. Users can enjoy the full functionality without any interruptions from advertisements.

### On what devices can I use Least Squares Curve Fit?

Least Squares Curve Fit is available on iPhone, iPad, and iPod. It is designed to be compatible with Apple's mobile operating systems.

### How often is Least Squares Curve Fit updated?

The latest version, 5.6, was last updated on May 29, 2025. This indicates a commitment to ongoing development and improvements for the application.

### What is the user sentiment for Least Squares Curve Fit?

Based on the available data, the app has a perfect 5.0-star rating from 2 reviews. This suggests a very positive reception from its current user base.

### Are there other educational apps from the same developer?

Yes, the app includes links to four other free applications by the same developer: 'Matrix Solver Step by Step', 'Polynomials and Linear Systems', 'GraphMath', and 'Vectors and Planes'.

## Version history (last 5 releases)

### 5.6 — 2025-05-29

Bug fixes and crash prevention

### 5.5 — 2025-02-13

1. Link to our new app: 'Construct Polynomial: Interpolate & Approximate'.
2. Bug fixes and UI improvements.

### 5.4 — 2024-11-16

Link to our new app: 'Polynomial Solver Step by Step', which will replace 'Polynomials and Linear Systems'.

### 5.3 — 2024-09-25

1. Link to our new app: "Calcu-Logarithm", all about logarithms, from arithmetic to calculus.
2. Bug fixes and crash prevention.

### 5.2 — 2024-09-16

1. Links to our new apps:
  * 'Drawing with Math' (Vector & Pixel Art),
  * '3D Rotations & Quaternions',
  * 'Base to Base' (Number Converter).
2. UI and performance improvements.

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## More apps by Yuri Morozov

- [GraphMath](https://appshunter.io/ios/app/graphmath/id1582680101)
- [Vectors and Planes](https://appshunter.io/ios/app/vectors-and-planes/id1605294727)
- [Matrix Solver Step by Step](https://appshunter.io/ios/app/matrix-solver-step-by-step/id1623894950)
- [Polynomials and Linear Systems](https://appshunter.io/ios/app/polynomials-and-linear-systems/id1642007937)
- [Drawing with Math](https://appshunter.io/ios/app/drawing-with-math/id6479322887)

All apps by Yuri Morozov: https://appshunter.io/developer/1582368813

## Related topics

[capri curves](https://appshunter.io/ios/topics/capri-curves) · [linearity curve](https://appshunter.io/ios/topics/linearity-curve)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*