# Function Fitter

> Function Fitter (iPhone/iPad app by 29Apps LLC.)

- Source: https://appshunter.io/ios/app/function-fitter/id6748284369 (this page in markdown: same URL + `.md`)
- Developer: [29Apps LLC](https://appshunter.io/developer/1817021563)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: English
- Released: 2025-07-08
- Data updated: 2026-08-01
- User reviews in markdown: https://appshunter.io/ios/app/function-fitter/id6748284369/reviews.md

## What is Function Fitter?

Function curve fitting using custom function that you enter. Reads data values either from file or manual entry, and tries to fit your function to the data by adjusting 1 to 4 parameters for a least-squares best fit. For enjoyment only, NOT for serious data needs.

This is minimalist by design with no ads, no in-app purchases, no bells and whistles, and no fancy moving graphics to distract you, just fun.

Note: Entertainment value only, fun using different parameter starting values.


## Version history (last 5 releases)

### 2.2.1 — 2026-07-28

- The Feedback screen subject and message fields must be non-blank after trimming whitespace.
- Minor UI improvements.

### 2.2.0 — 2026-05-04

- The computed parameter values and chart are now dynamically updated during the fitting process.
- Final parameter values can be used as new initial values at the click of a left arrow icon.
- Manually edited input data can now be saved to a file for ease of re-use.
- Improved Help text and introduction/instructions.
- UI improvements.

### 2.1.0 — 2026-03-21

- Added Help screen and Help icon on the home page.
- Bug fixes and UI improvements.

### 2.0.3 — 2025-08-18

2.n:
- New parallel fitter algorithm which determines parameter gradients and adjusts all parameter values one increment before repeating.

2.0.3:
- Improved the function parsing robustness to reduce app crash when bad function entered.

### 2.0.2 — 2025-07-18

2.0.n - New parallel fitter algorithm which determines parameter gradients and adjusts all parameter values one increment before repeating.

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All apps by 29Apps LLC: https://appshunter.io/developer/1817021563

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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 2026-08-01.*