# Sentinel vs LiquidFriday

The clearest difference is review sentiment: LiquidFriday at 50% against Sentinel's 10%. LiquidFriday also leads on update cadence (every 11 days vs every 4 months). Sentinel's advantage is iOS requirement (13.0 vs 15.1). 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, LiquidFriday every 11 days. The most recent releases landed on June 8, 2026 and August 18, 2026 respectively.

## The numbers

| Metric | Sentinel | LiquidFriday |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 9.8% of reviews | **50.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 11 days** |
| Monetization | Free | Free |
| Size | 6 MB | 40 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Reference Point Limited](https://appshunter.io/developer/662867085) | [Liquid Friday](https://appshunter.io/developer/1632331773) |

## 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


### LiquidFriday

[App page](https://appshunter.io/ios/app/liquidfriday/id1632331771)

Manage your contractor finances and assignments with this app. Request advances, view payslips, book time off, and access healthcare. Stay connected with your agency about availability for new roles.

**Highlights:** Manage assignment finances, Request advances, View payslips, Book time off, Access private GP healthcare, Indicate availability for new assignments

**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 LiquidFriday free?

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

### Do Sentinel or LiquidFriday have ads?

Neither Sentinel nor LiquidFriday shows ads.

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

Sentinel ships an update every 4 months, and LiquidFriday every 11 days. Most recently, Sentinel was updated on June 8, 2026 and LiquidFriday on August 18, 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.*