# Sentinel vs OWL Lite

The clearest difference is iOS requirement: Sentinel at 13.0 against OWL Lite's 15.0. 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.

Sentinel ships an update every 4 months, OWL Lite every 3 months. The most recent releases landed on June 8, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Sentinel | OWL Lite |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 9.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 6 MB | 51 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reference Point Limited](https://appshunter.io/developer/662867085) | [Onwave UK Ltd](https://appshunter.io/developer/1482756798) |

## 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


### OWL Lite

[App page](https://appshunter.io/ios/app/owl-lite/id1555014767)

**In-app purchases:** none


## Frequently asked questions

### Is Sentinel free?

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

### Is OWL Lite free?

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

### Do Sentinel or OWL Lite have ads?

Neither Sentinel nor OWL Lite shows ads.

### Which is updated more often, Sentinel or OWL Lite?

Sentinel ships an update every 4 months, and OWL Lite every 3 months. Most recently, Sentinel was updated on June 8, 2026 and OWL Lite on September 15, 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.*