# Euclid Lab vs HDLSim

The clearest difference is in-app purchases: Euclid Lab at none against HDLSim's 2. HDLSim's advantage is iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. HDLSim sells 2 in-app purchases, starting at $2.00 per month. Euclid Lab asks for nothing beyond the download.

Euclid Lab ships an update every 3 days, HDLSim every 4 days. The most recent releases landed on November 6, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | Euclid Lab | HDLSim |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Size | 14 MB | 15 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | **iPhone, iPad, Mac** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Yung-Hsin Shieh](https://appshunter.io/developer/6794223212) | [Julio Francisco Reyes Gonzalez](https://appshunter.io/developer/6824013496) |

## What reviewers say

### Euclid Lab

[App page](https://appshunter.io/ios/app/euclid-lab/id6801162141)

**Features:** Family Sharing, Vision Pro support

**In-app purchases:** none


### HDLSim

[App page](https://appshunter.io/ios/app/hdlsim/id6824013494)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HDLSim Pro Monthly | $2.00 | per month |
| HDLSim Pro Annual | $20.00 | per year |


## Frequently asked questions

### Is Euclid Lab free?

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

### Is HDLSim free?

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

### Do Euclid Lab or HDLSim have ads?

Neither Euclid Lab nor HDLSim shows ads.

### Which is updated more often, Euclid Lab or HDLSim?

Euclid Lab ships an update every 3 days, and HDLSim every 4 days. Most recently, Euclid Lab was updated on November 6, 2026 and HDLSim on November 13, 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.*