# Heliograph vs Hygrometer

The clearest difference is device support: Heliograph at 3 against Hygrometer's 1. Hygrometer's advantage is iOS requirement (17.0 vs 26.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Heliograph | Hygrometer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/hygrometer-humidity-meter/id6795464345/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | — |
| Monetization | — | Free |
| Size | 16 MB | 4 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, Apple TV, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Aphelion Engineering Pty Ltd](https://appshunter.io/developer/1896778280) | [Pixelated Development](https://appshunter.io/developer/389737341) |

## What reviewers say

### Heliograph

[App page](https://appshunter.io/ios/app/heliograph/id6783219208)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Hygrometer

[App page](https://appshunter.io/ios/app/hygrometer-humidity-meter/id6795464345)

This app helps you monitor and prevent mold and condensation by calculating surface humidity, not just room humidity. It provides real-time alerts based on surface temperature and outdoor weather forecasts, and advises on optimal times to ventilate your home.

**Highlights:** Surface humidity calculation, Mold and condensation risk alerts, Dynamic humidity limits based on forecast, Ventilation advice (driest hour), HomeKit sensor integration, Manual data input, Outdoor weather data display

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

**In-app purchases:** none


## Frequently asked questions

### Is Heliograph free?

Heliograph is free to download, with no in-app purchases.

### Is Hygrometer free?

Hygrometer is free to download, with no in-app purchases.

### Do Heliograph or Hygrometer have ads?

Neither Heliograph nor Hygrometer shows ads.

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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.*