# AVR Tutorial Pro vs Uncertainty Calculator

The clearest difference is in-app purchases: Uncertainty Calculator at none against AVR Tutorial Pro's 10. AVR Tutorial Pro's advantage is price ($1.99 vs $3.99) and iOS requirement (9.0 vs 17.0). On update cadence, ads and device support there is nothing between them.

AVR Tutorial Pro costs $1.99 and Uncertainty Calculator $3.99 up front. AVR Tutorial Pro sells 10 one-off in-app purchases. Uncertainty Calculator asks for nothing beyond the download.

AVR Tutorial Pro ships an update every 4 months, Uncertainty Calculator every 3 months. The most recent releases landed on August 22, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | AVR Tutorial Pro | Uncertainty Calculator |
| --- | --- | --- |
| Price | **$1.99** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uncertainty-calculator/id1170905440/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | — | Paid |
| Size | 33 MB | 1 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [Roman Volinsky](https://appshunter.io/developer/977951850) |

## What reviewers say

### AVR Tutorial Pro

[App page](https://appshunter.io/ios/app/avr-tutorial-pro/id1066643368)

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SPI OLED | $1.99 | one-time |
| Wifi home automation | $1.99 | one-time |
| I2C OLED | $1.99 | one-time |
| 2.2" TFT | $1.99 | one-time |
| Lora home automation | $1.99 | one-time |
| gps project | $2.99 | one-time |
| Home automation using Siri | $2.99 | one-time |
| Home automation using Google | $2.99 | one-time |
| BT home automation | $4.99 | one-time |
| BLE home automation | $4.99 | 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 AVR Tutorial Pro free?

AVR Tutorial Pro costs $1.99, and also offers in-app purchases.

### Is Uncertainty Calculator free?

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

### Do AVR Tutorial Pro or Uncertainty Calculator have ads?

Neither AVR Tutorial Pro nor Uncertainty Calculator shows ads.

### Which is updated more often, AVR Tutorial Pro or Uncertainty Calculator?

AVR Tutorial Pro ships an update every 4 months, and Uncertainty Calculator every 3 months. Most recently, AVR Tutorial Pro was updated on August 22, 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.*