# Sentinel vs innDex

The clearest difference is review sentiment: innDex at 60% against Sentinel's 10%. innDex also leads on update cadence (every 10 days vs every 4 months). 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, innDex every 10 days. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Sentinel | innDex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/inndex/id1457696057/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 9.8% of reviews | **60.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | Free | Free |
| Size | 8 MB | 71 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reference Point Limited](https://appshunter.io/developer/662867085) | [INNDEX LIMITED](https://appshunter.io/developer/1457696056) |

## 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


### innDex

[App page](https://appshunter.io/ios/app/inndex/id1457696057)

Streamline construction project management with a cloud-based platform for site inductions, health & safety, quality, and progress reporting. Manage inductions, timesheets, inspections, and more from any device.

**Highlights:** Cloud-based project management, Streamlined site inductions, Health & Safety reporting, Quality and Progress tracking, Timesheet management, Inspection management, Asset and vehicle tracking

**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 innDex free?

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

### Do Sentinel or innDex have ads?

Neither Sentinel nor innDex shows ads.

### Which is updated more often, Sentinel or innDex?

Sentinel ships an update every 4 months, and innDex every 10 days. Most recently, Sentinel was updated on November 1, 2026 and innDex on November 3, 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.*