# RMS Calculator vs Operational Amplifiers Pro

The clearest difference is update cadence: Operational Amplifiers Pro at every 2 months against RMS Calculator's every 15 months. RMS Calculator's advantage is price ($1.99 vs $4.99) and iOS requirement (12.0 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

RMS Calculator costs $1.99 and Operational Amplifiers Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RMS Calculator ships an update every 15 months, Operational Amplifiers Pro every 2 months. The most recent releases landed on October 27, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | RMS Calculator | Operational Amplifiers Pro |
| --- | --- | --- |
| Price | **$1.99** | $4.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 months** |
| Monetization | — | Paid |
| Size | 8 MB | 14 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | +4 | 4+ |
| Developer | [Kei Suefuji](https://appshunter.io/developer/1388335881) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### RMS Calculator

[App page](https://appshunter.io/ios/app/rms-calculator/id1511092361)

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

**In-app purchases:** none


### Operational Amplifiers Pro

[App page](https://appshunter.io/ios/app/operational-amplifiers-pro/id6467253953)

This app provides interactive calculators and reference information for designing and analyzing op-amp circuits. It offers step-by-step explanations and technical data on popular op-amp series, aiding students and engineers in circuit development and prototyping.

**Highlights:** Interactive op-amp circuit calculators, Step-by-step explanations and formulas, Reference data on op-amps and comparators, Support for 14 languages, Light and dark mode, Advanced calculators and circuit guides (Pro), Full-text search (Pro)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RMS Calculator free?

RMS Calculator costs $1.99, with no in-app purchases.

### Is Operational Amplifiers Pro free?

Operational Amplifiers Pro costs $4.99, with no in-app purchases.

### Do RMS Calculator or Operational Amplifiers Pro have ads?

Neither RMS Calculator nor Operational Amplifiers Pro shows ads.

### Which is updated more often, RMS Calculator or Operational Amplifiers Pro?

RMS Calculator ships an update every 15 months, and Operational Amplifiers Pro every 2 months. Most recently, RMS Calculator was updated on October 27, 2026 and Operational Amplifiers Pro on October 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.*