# RC Circuit vs Operational Amplifiers Guide

The clearest difference is in-app purchases: Operational Amplifiers Guide at none against RC Circuit's 1. Operational Amplifiers Guide also leads on update cadence (every 2 months vs every 6 months). RC Circuit's advantage is ads (none vs shown) and iOS requirement (12.0 vs 16.0). On price and device support there is nothing between them.

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

RC Circuit ships an update every 6 months, Operational Amplifiers Guide every 2 months. The most recent releases landed on September 24, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | RC Circuit | Operational Amplifiers Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/rc-circuit/id824460716/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 16 MB | 17 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Siu Yuen Ho](https://appshunter.io/developer/814088527) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### RC Circuit

[App page](https://appshunter.io/ios/app/rc-circuit/id824460716)

Calculate RC charging and filter circuits, including time constants and cutoff frequencies. Find component values from these parameters or get voltage at specific times. Save and share data easily.

**Highlights:** Calculate time constant, Find component values, Get voltage at time t, Calculate cutoff frequency, Save data to CSV, Upload CSV via AirDrop/iCloud Drive, Multi-language support

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro features | $0.99 | 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 RC Circuit free?

RC Circuit 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 RC Circuit or Operational Amplifiers Guide have ads?

Operational Amplifiers Guide shows ads; RC Circuit does not.

### Which is updated more often, RC Circuit or Operational Amplifiers Guide?

RC Circuit ships an update every 6 months, and Operational Amplifiers Guide every 2 months. Most recently, RC Circuit was updated on September 24, 2026 and Operational Amplifiers Guide on September 19, 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.*