# Opamp tools — Operational amplifier tools

> Operational amplifier tools (iPhone/iPad app by Siu Yuen Ho.)

- Source: https://appshunter.io/ios/app/opamp-tools/id1616271826 (this page in markdown: same URL + `.md`)
- Developer: [Siu Yuen Ho](https://appshunter.io/developer/814088527)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 12.0 · 4 MB
- Languages: English, French, German, Hindi, Italian, Japanese, Portuguese, Russian, Chinese, Spanish and 1 more
- Released: 2022-03-28
- Data updated: 2026-05-16
- User reviews in markdown: https://appshunter.io/ios/app/opamp-tools/id1616271826/reviews.md

## What is Opamp tools?

This app is the collection of operational amplifier calculators. It is suitable for hobbyist or electronic engineer.

Features
* Inverting amplifier 
* Non-Inverting amplifier 
* Differential amplifier 
* Summing amplifier
* Inverting comparator
* First-order filter  
* Second-order filter (HPF)
* Phase shift oscillator 
* Colpitts oscillator 
* Limit 5 combinations of component values 
* Share CSV via AirDrop
* Upload CSV to iCloud Drive (For iOS8 or later)

Pro Features  
* Instrumentation amplifier 
* Non-inverting comparator
* Second-order filter (LPF)
* Wien bridege oscillator
* Hartley oscillator
* No limitation of the number of suggestions  
* Selectable 1%,5%,10%,20% of values

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock pro feature | $1.99 | one-time |



## Version history (last 3 releases)

### 1.0.10 — 2024-03-25

Fix minor bugs

### 1.0.05 — 2022-03-31

Fix minor bugs

### 1.0.00 — 2022-03-28

No release notes.

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## More apps by Siu Yuen Ho

- [Easy Ohm's Law](https://appshunter.io/ios/app/easy-ohms-law/id814088524)
- [RC Circuit Pro](https://appshunter.io/ios/app/rc-circuit-pro/id824145786)
- [RC Circuit](https://appshunter.io/ios/app/rc-circuit/id824460716)
- [Resistor Tools Pro](https://appshunter.io/ios/app/resistor-tools-pro/id825620924)
- [Resistor Tools](https://appshunter.io/ios/app/resistor-tools/id826045228)
- [Timer 555 Calculator Pro](https://appshunter.io/ios/app/timer-555-calculator-pro/id833443125)

All apps by Siu Yuen Ho: https://appshunter.io/developer/814088527

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-16.*