# Currency Professional vs Operational Amplifiers Guide

The clearest difference is in-app purchases: Operational Amplifiers Guide at none against Currency Professional's 1. Operational Amplifiers Guide also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (16.0 vs 26.0). Currency Professional's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Currency Professional sells 1 one-off in-app purchase. Operational Amplifiers Guide asks for nothing beyond the download.

Currency Professional ships an update every 5 months, Operational Amplifiers Guide every 2 months. The most recent releases landed on October 3, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Currency Professional | Operational Amplifiers Guide |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 months** |
| Size | 21 MB | 17 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Currency Professional

[App page](https://appshunter.io/ios/app/currency-professional/id1493772243)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertising | $1.99 | one-time |


### 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 Currency Professional free?

Currency Professional is free to download, with in-app purchases available.

### Is Operational Amplifiers Guide free?

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

### Do Currency Professional or Operational Amplifiers Guide have ads?

Operational Amplifiers Guide shows ads; Currency Professional does not.

### Which is updated more often, Currency Professional or Operational Amplifiers Guide?

Currency Professional ships an update every 5 months, and Operational Amplifiers Guide every 2 months. Most recently, Currency Professional was updated on October 3, 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.*