# AVR Tutorial vs Orthodox Bells

The clearest difference is in-app purchases: Orthodox Bells at none against AVR Tutorial's 10. Orthodox Bells also leads on update cadence (every 5 days vs every 3 months). AVR Tutorial's advantage is iOS requirement (9.0 vs 26.1). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. AVR Tutorial sells 10 one-off in-app purchases. Orthodox Bells asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for AVR Tutorial against 5.0 for Orthodox Bells. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

AVR Tutorial ships an update every 3 months, Orthodox Bells every 5 days. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | AVR Tutorial | Orthodox Bells |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/avr-tutorial/id1070496499/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/orthodox-bells/id6756116717/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 33 MB | 55 MB |
| Requires iOS | **9.0** | 26.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [TELEMACHOS STAMKOPOULOS](https://appshunter.io/developer/1858557258) |

## What reviewers say

### AVR Tutorial

[App page](https://appshunter.io/ios/app/avr-tutorial/id1070496499)

This app simplifies learning AVR microcontrollers with a code wizard that generates C source code for various peripherals. It offers demo projects and an architecture review, making complex MCU programming more accessible for hobbyists and students.

**Highlights:** AVR architecture review, AVR assembly and C language, 21 demo projects, Code wizard for peripherals, Portability to other ATMEGA MCUs, I2C and SPI EEPROM support (PRO)

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock PRO feature | $1.99 | one-time |
| SPI OLED | $1.99 | one-time |
| I2C OLED | $1.99 | one-time |
| Wifi home automation | $1.99 | one-time |
| 2.2" TFT | $1.99 | one-time |
| LoRa home automation | $1.99 | 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 |


### Orthodox Bells

[App page](https://appshunter.io/ios/app/orthodox-bells/id6756116717)

This app allows users to connect their iOS devices to external speakers to play Orthodox bell sounds. It provides a simple interface for ringing bells, enhancing religious services or personal devotion.

**Highlights:** Connect to speakers, Ring Orthodox bells, iOS device integration, Simple interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AVR Tutorial free?

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

### Is Orthodox Bells free?

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

### Which has better reviews, AVR Tutorial or Orthodox Bells?

AVR Tutorial and Orthodox Bells are both rated 5.0 out of 5 on the App Store, from 2 and 2 ratings respectively.

### Do AVR Tutorial or Orthodox Bells have ads?

Neither AVR Tutorial nor Orthodox Bells shows ads.

### Which is updated more often, AVR Tutorial or Orthodox Bells?

AVR Tutorial ships an update every 3 months, and Orthodox Bells every 5 days. Most recently, AVR Tutorial was updated on November 2, 2026 and Orthodox Bells on October 30, 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.*