# Spectro by Variable vs Human RHD

The clearest difference is in-app purchases: Human RHD at none against Spectro by Variable's 5. Human RHD also leads on update cadence (weekly vs every 3 weeks). Spectro by Variable's advantage is iOS requirement (13.4 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Spectro by Variable sells 5 in-app purchases, starting at $9.99 per month. Human RHD asks for nothing beyond the download.

Spectro by Variable ships an update every 3 weeks, Human RHD weekly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Spectro by Variable | Human RHD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (121 ratings)](https://appshunter.io/ios/app/spectro-by-variable/id1399186748/reviews)** | — |
| Number of ratings | **121** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 84 MB | 131 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Variable Technologies LLC](https://appshunter.io/developer/569541572) | [VenturesSoft México](https://appshunter.io/developer/1223614951) |

## What reviewers say

### Spectro by Variable

[App page](https://appshunter.io/ios/app/spectro-by-variable/id1399186748)

This app enables color professionals to precisely measure, match, and communicate color data using connected devices. Access extensive color libraries and analyze spectral curves for accurate results anytime, anywhere.

**Highlights:** Scan, match, and compare colors, View spectral curves and LAB values, Access extensive brand color libraries, Analyze colors under multiple light sources, Store and export scan data, Create and store color standards

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $9.99 | per month |
| Monthly | $15.99 | per month |
| Quality Control Module | $75.00 | per month |
| Annual | $99.99 | per year |
| Annual | $149.99 | per year |


### Human RHD

[App page](https://appshunter.io/ios/app/human-rhd/id1579513213)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Spectro by Variable free?

Spectro by Variable is free to download, with in-app purchases available.

### Is Human RHD free?

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

### Do Spectro by Variable or Human RHD have ads?

Neither Spectro by Variable nor Human RHD shows ads.

### Which is updated more often, Spectro by Variable or Human RHD?

Spectro by Variable ships an update every 3 weeks, and Human RHD weekly. Most recently, Spectro by Variable was updated on November 6, 2026 and Human RHD on November 3, 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.*