# Uncertainty Calculator vs OC Safe

The clearest difference is price: OC Safe at Free against Uncertainty Calculator's $3.99. OC Safe also leads on iOS requirement (15.6 vs 17.0). Uncertainty Calculator's advantage is update cadence (every 3 months vs every 22 months). On ads, in-app purchases and device support there is nothing between them.

OC Safe 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, OC Safe every 22 months. The most recent releases landed on October 18, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Uncertainty Calculator | OC Safe |
| --- | --- | --- |
| 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** | Every 22 months |
| Monetization | Paid | — |
| Size | 1 MB | 29 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roman Volinsky](https://appshunter.io/developer/977951850) | [Okanagan College](https://appshunter.io/developer/436819272) |

## 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


### OC Safe

[App page](https://appshunter.io/ios/app/oc-safe/id1358475295)

**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 OC Safe free?

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

### Do Uncertainty Calculator or OC Safe have ads?

Neither Uncertainty Calculator nor OC Safe shows ads.

### Which is updated more often, Uncertainty Calculator or OC Safe?

Uncertainty Calculator ships an update every 3 months, and OC Safe every 22 months. Most recently, Uncertainty Calculator was updated on October 18, 2026 and OC Safe on October 21, 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.*