# MASmobile FLEX vs SHLTR

MASmobile FLEX and SHLTR are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on September 16, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | MASmobile FLEX | SHLTR |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | Free | — |
| Size | 79 MB | 28 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Honeywell International, Inc.](https://appshunter.io/developer/311222963) | [Richard Jansen](https://appshunter.io/developer/1535790892) |

## What reviewers say

### MASmobile FLEX

[App page](https://appshunter.io/ios/app/masmobile-flex/id1517999227)

Manage customer data, place systems on or off test, and view event and zone history from a mobile device. This app requires MASterMind EX services and is designed for authorized central station personnel and dealers.

**Highlights:** Manage customer data, Place systems on/off test, View system event history, View test history, View system zones, Light and dark interface styles, Biometric login support

**Features:** Vision Pro support

**In-app purchases:** none


### SHLTR

[App page](https://appshunter.io/ios/app/shltr-group/id6477293039)

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

**In-app purchases:** none


## Frequently asked questions

### Is MASmobile FLEX free?

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

### Is SHLTR free?

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

### Do MASmobile FLEX or SHLTR have ads?

Neither MASmobile FLEX nor SHLTR shows ads.

### Which is updated more often, MASmobile FLEX or SHLTR?

MASmobile FLEX ships an update every 3 weeks, and SHLTR every 3 weeks. Most recently, MASmobile FLEX was updated on September 16, 2026 and SHLTR on September 9, 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.*