# Scan vs SHO

The clearest difference is rating: Scan at 5.0 against SHO's 4.2. Scan also leads on update cadence (every 3 weeks vs every 2 months) and iOS requirement (8.0 vs 14.2). On price, ratings volume, 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.

Scan holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 12 respectively.

Scan ships an update every 3 weeks, SHO every 2 months. The most recent releases landed on September 23, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Scan | SHO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/scan-lock-plus/id1273746211/reviews)** | [4.2 (12 ratings)](https://appshunter.io/ios/app/sho-flow/id1447418345/reviews) |
| Number of ratings | 5 | **12** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 41 MB | 145 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) | [Task Force Tips](https://appshunter.io/developer/1447418344) |

## 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


### SHO

[App page](https://appshunter.io/ios/app/sho-flow/id1447418345)

This app assists firefighters in calculating water flow rates, pump discharge pressures, and nozzle reactions. It can be used with a Bluetooth flow meter or as a standalone calculator with established fire flow formulas. Educational videos on water flow are also included.

**Highlights:** Calculate fire hose flow rates, Determine pump discharge pressures, Calculate nozzle reaction, Perform NFPA 1962 nozzle flow tests, Standalone water flow calculator, Water flow education videos

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Scan free?

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

### Is SHO free?

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

### Which has better reviews, Scan or SHO?

Scan is rated higher. Scan averages 5.0 out of 5 from 5 ratings, while SHO averages 4.2 from 12 ratings.

### Do Scan or SHO have ads?

Neither Scan nor SHO shows ads.

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

Scan ships an update every 3 weeks, and SHO every 2 months. Most recently, Scan was updated on September 23, 2026 and SHO on September 27, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*