# Curve vs Nullify

The clearest difference is price: Nullify at Free against Curve's $0.99. Nullify also leads on update cadence (every 3 months vs every 42 months). Curve's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.0). On ads and in-app purchases there is nothing between them.

Nullify is free to download; Curve costs $0.99 up front. Curve sells 1 one-off in-app purchase and Nullify sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Curve ships an update every 42 months, Nullify every 3 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Curve | Nullify |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/curve-fit/id1450077815/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 42 months | **Every 3 months** |
| Monetization | Free with in-app purchases | — |
| Size | 1 MB | 11 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Bjarne Berge](https://appshunter.io/developer/1209858941) | [SAVAS KOC](https://appshunter.io/developer/1792030670) |

## What reviewers say

### Curve

[App page](https://appshunter.io/ios/app/curve-fit/id1450077815)

This app performs regression analysis using the method of least squares to fit various equations to your data. The free version offers straight-line fitting, with additional equation types available via an in-app purchase. It's designed for users needing to analyze and model data sets.

**Highlights:** Least squares regression analysis, Multiple equation fitting options, Data set analysis, Free straight-line fitting, In-app purchase for advanced equations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Curve-Fit | $2.99 | one-time |


### Nullify

[App page](https://appshunter.io/ios/app/nullify-redact-and-blur-docs/id6761437328)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $3.99 | per 7 days |
| Monthly | $9.99 | per month |
| Annual | $39.99 | per year |


## Frequently asked questions

### Is Curve free?

Curve costs $0.99, and also offers in-app purchases.

### Is Nullify free?

Nullify is free to download, with in-app purchases available.

### Do Curve or Nullify have ads?

Neither Curve nor Nullify shows ads.

### Which is updated more often, Curve or Nullify?

Curve ships an update every 42 months, and Nullify every 3 months. Most recently, Curve was updated on October 24, 2026 and Nullify on October 28, 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.*