# SDT VR (Google Cardboard) vs E Sentry Systems

The clearest difference is iOS requirement: SDT VR (Google Cardboard) at 8.0 against E Sentry Systems's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 12, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | SDT VR (Google Cardboard) | E Sentry Systems |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 248 MB | 54 MB |
| Requires iOS | **8.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SDT International SA](https://appshunter.io/developer/1275552047) | [IRISS Inc](https://appshunter.io/developer/1245323320) |

## What reviewers say

### SDT VR (Google Cardboard)

[App page](https://appshunter.io/ios/app/sdt-vr-google-cardboard/id1414322113)

Explore the capabilities of the SDT340 Ultrasound Solution. This application demonstrates how to predict failures, manage energy expenses, and enhance product quality for improved asset uptime.

**Highlights:** Predict equipment failures, Control energy costs, Improve product quality, Enhance asset uptime, Demonstrates SDT340 Ultrasound Solution

**Features:** macOS Compatibility

**In-app purchases:** none


### E Sentry Systems

[App page](https://appshunter.io/ios/app/e-sentry-systems/id6444192723)

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

**In-app purchases:** none


## Frequently asked questions

### Is SDT VR (Google Cardboard) free?

SDT VR (Google Cardboard) is free to download, with no in-app purchases.

### Is E Sentry Systems free?

E Sentry Systems is free to download, with no in-app purchases.

### Do SDT VR (Google Cardboard) or E Sentry Systems have ads?

Neither SDT VR (Google Cardboard) nor E Sentry Systems shows ads.

### Which is updated more often, SDT VR (Google Cardboard) or E Sentry Systems?

SDT VR (Google Cardboard) ships an update every 3 weeks, and E Sentry Systems every 3 weeks. Most recently, SDT VR (Google Cardboard) was updated on October 12, 2026 and E Sentry Systems on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*