# Implicit Differentiation Cal vs Least Squares Curve Fit

The clearest difference is update cadence: Least Squares Curve Fit at every 8 days against Implicit Differentiation Cal's every 9 months. Implicit Differentiation Cal's advantage is iOS requirement (13.0 vs 15.0). 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.

Implicit Differentiation Cal ships an update every 9 months, Least Squares Curve Fit every 8 days. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Implicit Differentiation Cal | Least Squares Curve Fit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/least-squares-curve-fit/id6443509668/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 8 days** |
| Monetization | — | Free |
| Size | 24 MB | 7 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Ahmad Sattar](https://appshunter.io/developer/1458483953) | [Yuri Morozov](https://appshunter.io/developer/1582368813) |

## What reviewers say

### Implicit Differentiation Cal

[App page](https://appshunter.io/ios/app/implicit-differentiation-cal/id1607963477)

**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 Implicit Differentiation Cal free?

Implicit Differentiation Cal 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.

### Do Implicit Differentiation Cal or Least Squares Curve Fit have ads?

Neither Implicit Differentiation Cal nor Least Squares Curve Fit shows ads.

### Which is updated more often, Implicit Differentiation Cal or Least Squares Curve Fit?

Implicit Differentiation Cal ships an update every 9 months, and Least Squares Curve Fit every 8 days. Most recently, Implicit Differentiation Cal was updated on November 7, 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.*