# Uncertainty Calculator vs SOBRAF

The clearest difference is price: SOBRAF at Free against Uncertainty Calculator's $3.99. SOBRAF also leads on update cadence (monthly vs every 3 months) and iOS requirement (14.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

SOBRAF is free to download; Uncertainty Calculator costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Uncertainty Calculator ships an update every 3 months, SOBRAF monthly. The most recent releases landed on September 14, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Uncertainty Calculator | SOBRAF |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Paid | — |
| Size | 1 MB | 27 MB |
| Requires iOS | 17.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Longevidade Saud�vel Educa�o e Servi�os para Sa�de Ltda](https://appshunter.io/developer/916786802) |

## What reviewers say

### 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


### SOBRAF

[App page](https://appshunter.io/ios/app/sobraf/id1639393183)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Uncertainty Calculator free?

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

### Is SOBRAF free?

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

### Do Uncertainty Calculator or SOBRAF have ads?

Neither Uncertainty Calculator nor SOBRAF shows ads.

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

Uncertainty Calculator ships an update every 3 months, and SOBRAF monthly. Most recently, Uncertainty Calculator was updated on September 14, 2026 and SOBRAF on May 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*