# Sentinel

> Business

Canonical page: [https://chrome-stats.com/d/id662867082](https://chrome-stats.com/d/id662867082)

## Overview

- **ID:** `id662867082`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Reference Point Limited
- **Category:** Business
- **Version:** 3.4.3
- **Last updated:** 2024-09-16
- **First published:** 2013-08-04
- **Size:** 5.57 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/sentinel/id662867082)
- **Privacy policy:** [https://www.railsentinel.co.uk/Sentinel/Content/Documents/SentinelPrivacyNotice.pdf](https://www.railsentinel.co.uk/Sentinel/Content/Documents/SentinelPrivacyNotice.pdf)

## Description

Sentinel is a Chrome extension that reads Sentinel smartcards for Network Rail’s Sentinel system. It supports verifying cardholders by scanning QR codes or reading card data over NFC, delivering up-to-date information whether online or offline.

Authorized card checkers can authenticate their teams, conduct spot checks, and log TVPs. When online, checks are uploaded to the database; when offline, details are stored locally and synced when connected again.

## Rankings

- #1,180,295 — Overall

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- [Sentinel 3.0](https://chrome-stats.com/d/id6754856505)
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- [Sentinel I](https://chrome-stats.com/d/id6532624268)

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Source: [Chrome-Stats](https://chrome-stats.com/d/id662867082)