# RequestLab vs Tersa

The clearest difference is update cadence: Tersa at every 2 weeks against RequestLab's every 3 weeks. Tersa also leads on iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

RequestLab ships an update every 3 weeks, Tersa every 2 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | RequestLab | Tersa |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | — | Free |
| Size | 18 MB | 122 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Vision Pro | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Martin Albrecht](https://appshunter.io/developer/1479205686) | [Denis Kosov](https://appshunter.io/developer/1563252853) |

## What reviewers say

### RequestLab

[App page](https://appshunter.io/ios/app/requestlab/id6477221079)

**Features:** macOS Compatibility

**In-app purchases:** none


### Tersa

[App page](https://appshunter.io/ios/app/tersa-circuit-simulator/id6805903884)

Design and analyze analog, digital, and RF circuits directly on your iPhone or iPad. Explore circuit behavior with various simulations and visualize results on clear plots. Supports SPICE model import and local project exploration.

**Highlights:** Schematic building, DC operating point analysis, AC and transient analyses, S-parameter analysis, Smith chart visualization, SPICE model import, Local simulation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RequestLab free?

RequestLab is free to download, with no in-app purchases.

### Is Tersa free?

Tersa is free to download, with no in-app purchases.

### Do RequestLab or Tersa have ads?

Neither RequestLab nor Tersa shows ads.

### Which is updated more often, RequestLab or Tersa?

RequestLab ships an update every 3 weeks, and Tersa every 2 weeks. Most recently, RequestLab was updated on October 25, 2026 and Tersa on October 31, 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.*