# Sentinel vs PPAC Compliant101

The clearest difference is update cadence: PPAC Compliant101 at every 3 days against Sentinel's every 4 months. PPAC Compliant101 also leads on review sentiment (19% vs 10%). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Sentinel ships an update every 4 months, PPAC Compliant101 every 3 days. The most recent releases landed on October 20, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Sentinel | PPAC Compliant101 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 9.8% of reviews | **19.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 8 MB | 344 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Reference Point Limited](https://appshunter.io/developer/662867085) | [PPAC](https://appshunter.io/developer/1689182055) |

## What reviewers say

### Sentinel

[App page](https://appshunter.io/ios/app/sentinel/id662867082)

Access and verify Network Rail Sentinel smartcards. Check your own card details or authenticate team members and conduct spot checks. Works online for real-time data or offline for card access and stored check history.

**Highlights:** Read Sentinel smartcards via NFC, Scan QR codes for card data, Verify cardholder information, Authenticate team members, Perform spot checks, Check TVPs (Track Vacancy Permits), Offline access to card data

**In-app purchases:** none


### PPAC Compliant101

[App page](https://appshunter.io/ios/app/ppac-compliant101/id6449454073)

This app streamlines workforce compliance for construction and regulated industries. It simplifies identity and document verification, remote onboarding, and site access management. The platform ensures accuracy, transparency, and control for high-volume workforces.

**Highlights:** Identity and document verification, Remote onboarding and on-site approval, Multi-site access with single approval, Real-time status and expiry tracking, Fast and frictionless for high-volume use, Secure data handling

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

**In-app purchases:** none


## Frequently asked questions

### Is Sentinel free?

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

### Is PPAC Compliant101 free?

PPAC Compliant101 is free to download, with no in-app purchases.

### Do Sentinel or PPAC Compliant101 have ads?

Neither Sentinel nor PPAC Compliant101 shows ads.

### Which is updated more often, Sentinel or PPAC Compliant101?

Sentinel ships an update every 4 months, and PPAC Compliant101 every 3 days. Most recently, Sentinel was updated on October 20, 2026 and PPAC Compliant101 on October 21, 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.*