# Curvature vs Simple Solar

The clearest difference is price: Simple Solar at Free against Curvature's $1.99. Simple Solar also leads on update cadence (every 3 weeks vs every 5 months). Curvature's advantage is in-app purchases (none vs 4). On ads, device support and iOS requirement there is nothing between them.

Simple Solar is free to download; Curvature costs $1.99 up front. Simple Solar sells 4 in-app purchases, starting at $6.99 per month. Curvature asks for nothing beyond the download.

Curvature ships an update every 5 months, Simple Solar every 3 weeks. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Curvature | Simple Solar |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/curvature/id1441050109/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 116 MB | 73 MB |
| Requires iOS | 17.6 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Steven Wilkinson](https://appshunter.io/developer/1441050108) | [Minutia Mobile](https://appshunter.io/developer/1446213585) |

## What reviewers say

### Curvature

[App page](https://appshunter.io/ios/app/curvature/id1441050109)

This app provides advanced tools for calculating and visualizing earth measurements, including curvature, horizon distance, and drop distance. It features a redesigned interface with precision mapping, data persistence, and a knowledge hub with research resources.

**Highlights:** Advanced Earth Calculators, Graphic Result Visualization, Precision Mapping Tools, Data Persistence with SwiftData, Expanded PDF Library, Universal Unit Converter, Save & Export Calculations

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

**In-app purchases:** none


### Simple Solar

[App page](https://appshunter.io/ios/app/simple-solar/id6743857767)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Automation | $6.99 | per month |
| Yearly Subscription | $59.00 | per year |
| Remove Ads | $2.99 | one-time |
| Remove Ad's | $2.99 | one-time |


## Frequently asked questions

### Is Curvature free?

Curvature costs $1.99, with no in-app purchases.

### Is Simple Solar free?

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

### Do Curvature or Simple Solar have ads?

Neither Curvature nor Simple Solar shows ads.

### Which is updated more often, Curvature or Simple Solar?

Curvature ships an update every 5 months, and Simple Solar every 3 weeks. Most recently, Curvature was updated on October 24, 2026 and Simple Solar on October 20, 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.*