# RayLab vs Uncertainty Calculator

The clearest difference is price: RayLab at Free against Uncertainty Calculator's $3.99. RayLab also leads on ratings volume (63 vs 1) and update cadence (every 6 weeks vs every 3 months). Uncertainty Calculator's advantage is in-app purchases (none vs 10) and ads (none vs shown). On device support there is nothing between them.

RayLab is free to download; Uncertainty Calculator costs $3.99 up front. RayLab sells 10 in-app purchases, starting at $3.99 per month. Uncertainty Calculator asks for nothing beyond the download.

Uncertainty Calculator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: RayLab has 63 ratings behind it against 1, so its average is the more settled of the two.

RayLab ships an update every 6 weeks, Uncertainty Calculator every 3 months. The most recent releases landed on July 29, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | RayLab | Uncertainty Calculator |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.6 (63 ratings)](https://appshunter.io/ios/app/raylab/id710190065/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** |
| Number of ratings | **63** | 1 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 39 MB | 1 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kamyar Ghandi](https://appshunter.io/developer/710190068) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### RayLab

[App page](https://appshunter.io/ios/app/raylab/id710190065)

Design and simulate optical systems with this powerful tool. Explore 2D and 3D models, perform advanced ray tracing, and analyze optical performance. Ideal for learning or professional design.

**Highlights:** 2D/3D optical modeling, Geometric ray tracing, Sequential and non-sequential analysis, Advanced optical elements, Polarization ray tracing, Design optimization, Glass catalogs

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RayLab Pro Subscription | $3.99 | per month |
| RayLab Pro Upgrade | Free | one-time |
| Schott Glass Catalog | $0.99 | one-time |
| Custom Glass Editor | $0.99 | one-time |
| Advanced Optical Elements | $1.99 | one-time |
| Source and Lens Arrays | $1.99 | one-time |
| Solver/Optimizer Module | $3.99 | one-time |
| 3D Modeling | $4.99 | one-time |
| RayLab Pro 2 | $19.99 | one-time |
| RayLab Pro Bundle | $19.99 | one-time |


### Uncertainty Calculator

[App page](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440)

This app allows users to perform error propagation calculations for mathematical expressions involving uncertain variables. It supports absolute and relative error inputs, various functions, and trigonometric calculations in degrees or radians. The tool helps ensure accurate reporting of results based on estimated errors.

**Highlights:** Error propagation calculations, Absolute and relative error input, Support for mathematical functions, Trigonometric calculations (degrees/radians), Variable combination in expressions, Significant figure guidance

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

**In-app purchases:** none


## Frequently asked questions

### Is RayLab free?

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

### Is Uncertainty Calculator free?

Uncertainty Calculator costs $3.99, with no in-app purchases.

### Which has better reviews, RayLab or Uncertainty Calculator?

Uncertainty Calculator is rated higher. RayLab averages 4.6 out of 5 from 63 ratings, while Uncertainty Calculator averages 5.0 from 1 ratings.

### Do RayLab or Uncertainty Calculator have ads?

RayLab shows ads; Uncertainty Calculator does not.

### Which is updated more often, RayLab or Uncertainty Calculator?

RayLab ships an update every 6 weeks, and Uncertainty Calculator every 3 months. Most recently, RayLab was updated on July 29, 2026 and Uncertainty Calculator on September 14, 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.*