# Scan vs LiquidSpring

The clearest difference is update cadence: Scan at every 3 weeks against LiquidSpring's every 4 months. Scan also leads on iOS requirement (8.0 vs 14.2). On price, ads, in-app purchases and device support there is nothing between them.

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

Scan ships an update every 3 weeks, LiquidSpring every 4 months. The most recent releases landed on September 23, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Scan | LiquidSpring |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/scan-lock-plus/id1273746211/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 41 MB | 78 MB |
| Requires iOS | **8.0** | 14.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Whelen Engineering Co.](https://appshunter.io/developer/1273746210) | [LiquidSpring](https://appshunter.io/developer/1690587817) |

## What reviewers say

### Scan

[App page](https://appshunter.io/ios/app/scan-lock-plus/id1273746211)

Easily manage Whelen flash patterns for compatible lightheads using your phone. Browse, test, and assign patterns wirelessly via Bluetooth with a required programmer.

**Highlights:** Browse and assign flash patterns, Test patterns up to 20 seconds, Access steady pattern option, Bluetooth connectivity, Supports compatible Whelen lightheads

**Features:** macOS Compatibility

**In-app purchases:** none


### LiquidSpring

[App page](https://appshunter.io/ios/app/liquidspring/id6449782295)

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

**In-app purchases:** none


## Frequently asked questions

### Is Scan free?

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

### Is LiquidSpring free?

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

### Do Scan or LiquidSpring have ads?

Neither Scan nor LiquidSpring shows ads.

### Which is updated more often, Scan or LiquidSpring?

Scan ships an update every 3 weeks, and LiquidSpring every 4 months. Most recently, Scan was updated on September 23, 2026 and LiquidSpring on October 1, 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.*