# Lighting Calculations vs SamtechKey

The clearest difference is in-app purchases: SamtechKey at none against Lighting Calculations's 3. SamtechKey also leads on ads (none vs shown) and update cadence (fortnightly vs every 5 weeks). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Lighting Calculations sells 3 in-app purchases, starting at $1.99 per 3 months. SamtechKey asks for nothing beyond the download.

Lighting Calculations ships an update every 5 weeks, SamtechKey fortnightly. The most recent releases landed on October 3, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Lighting Calculations | SamtechKey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/lighting-calculations/id1021580336/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 32 MB | 22 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Egal Net di Ettore Gallina](https://appshunter.io/developer/993232047) | [Samtech S.A.](https://appshunter.io/developer/721819248) |

## What reviewers say

### Lighting Calculations

[App page](https://appshunter.io/ios/app/lighting-calculations/id1021580336)

This app transforms your smartphone into a comprehensive lighting design tool. It offers advanced calculations for room lighting, LED analysis, and efficiency, alongside quick conversions and essential technical resources. Ensure your lighting projects meet all standards and optimize energy usage.

**Highlights:** Room lighting design calculations, LED analysis (lifespan, photobiological risk), Energy efficiency calculations, Photometric code decoding, Lumen, Lux, Candela, Watt conversions, Normative requirements and technical guides, Light quality metrics (CRI, UGR)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Version (3 months) | $1.99 | per 3 months |
| PRO Version (1 year) | $2.99 | per year |
| PRO Version (Lifetime) | $89.99 | one-time |


### SamtechKey

[App page](https://appshunter.io/ios/app/samtechkey/id6753020281)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lighting Calculations free?

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

### Is SamtechKey free?

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

### Do Lighting Calculations or SamtechKey have ads?

Lighting Calculations shows ads; SamtechKey does not.

### Which is updated more often, Lighting Calculations or SamtechKey?

Lighting Calculations ships an update every 5 weeks, and SamtechKey fortnightly. Most recently, Lighting Calculations was updated on October 3, 2026 and SamtechKey on September 18, 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.*