# Heliosy vs ZoneCalc

The clearest difference is price: ZoneCalc at Free against Heliosy's $2.99. ZoneCalc also leads on update cadence (every 3 weeks vs every 4 months). Heliosy's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

ZoneCalc is free to download; Heliosy costs $2.99 up front. ZoneCalc sells 1 one-off in-app purchase. Heliosy asks for nothing beyond the download.

Heliosy ships an update every 4 months, ZoneCalc every 3 weeks. The most recent releases landed on September 19, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Heliosy | ZoneCalc |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 weeks** |
| Monetization | Paid | **Freemium** |
| Size | 2 MB | 3 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jean-Christoph KAISER](https://appshunter.io/developer/309381304) | [Juergen Suk](https://appshunter.io/developer/6772102748) |

## What reviewers say

### Heliosy

[App page](https://appshunter.io/ios/app/heliosy/id980955678)

This app helps you track the sun's position for any day and location. It's useful for photographers planning shoots, real estate agents assessing sunlight, or builders choosing optimal locations for outdoor pools. Visualize sun paths through various displays like live camera, 3D compass, or maps.

**Highlights:** Sun path tracking for current or custom locations, Visualize sun path on live camera, 3D compass sun path display, Sun path on map view, Golden hour and blue hour identification, Twilight times display, Sun path graph

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

**In-app purchases:** none


### ZoneCalc

[App page](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746)

This app assists photographers in precisely calculating exposure and tonal placement using Ansel Adams' Zone System. It offers features for metering, reciprocity correction, and development adjustments, with options for multi-point measurements and data export.

**Highlights:** Zone System exposure calculation, Multi-point metering, Reciprocity correction, Development adjustment recommendations, Film-specific development times, Calculation history and export

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZoneCalc Pro | $3.99 | one-time |


## Frequently asked questions

### Is Heliosy free?

Heliosy costs $2.99, with no in-app purchases.

### Is ZoneCalc free?

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

### Do Heliosy or ZoneCalc have ads?

Neither Heliosy nor ZoneCalc shows ads.

### Which is updated more often, Heliosy or ZoneCalc?

Heliosy ships an update every 4 months, and ZoneCalc every 3 weeks. Most recently, Heliosy was updated on September 19, 2026 and ZoneCalc on September 9, 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.*