# Pedal Builder vs Operational Amplifiers Guide

The clearest difference is price: Operational Amplifiers Guide at Free against Pedal Builder's $1.99. Operational Amplifiers Guide also leads on update cadence (every 2 months vs every 19 months). Pedal Builder's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Operational Amplifiers Guide is free to download; Pedal Builder costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pedal Builder ships an update every 19 months, Operational Amplifiers Guide every 2 months. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Pedal Builder | Operational Amplifiers Guide |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 19 months | **Every 2 months** |
| Size | 27 MB | 17 MB |
| Requires iOS | 16.0 | 16.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [John Toms](https://appshunter.io/developer/591598841) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Pedal Builder

[App page](https://appshunter.io/ios/app/pedal-builder/id6448482080)

**Features:** Vision Pro support

**In-app purchases:** none


### Operational Amplifiers Guide

[App page](https://appshunter.io/ios/app/operational-amplifiers-guide/id6467499897)

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

**In-app purchases:** none


## Frequently asked questions

### Is Pedal Builder free?

Pedal Builder costs $1.99, with no in-app purchases.

### Is Operational Amplifiers Guide free?

Operational Amplifiers Guide is free to download, with no in-app purchases.

### Do Pedal Builder or Operational Amplifiers Guide have ads?

Operational Amplifiers Guide shows ads; Pedal Builder does not.

### Which is updated more often, Pedal Builder or Operational Amplifiers Guide?

Pedal Builder ships an update every 19 months, and Operational Amplifiers Guide every 2 months. Most recently, Pedal Builder was updated on October 7, 2026 and Operational Amplifiers Guide on October 1, 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.*