# Stack Testers Flow Friend vs ControlPlus2

The clearest difference is review sentiment: ControlPlus2 at 20% against Stack Testers Flow Friend's 0%. ControlPlus2 also leads on update cadence (every 3 months vs every 8 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.

Stack Testers Flow Friend ships an update every 8 months, ControlPlus2 every 3 months. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Stack Testers Flow Friend | ControlPlus2 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **20.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 32 MB | 17 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Lewis Holmes](https://appshunter.io/developer/1454834389) | [Colin Galbraith](https://appshunter.io/developer/1371186521) |

## What reviewers say

### Stack Testers Flow Friend

[App page](https://appshunter.io/ios/app/stack-testers-flow-friend/id1454834655)

This mobile toolkit assists environmental engineers with on-site calculations for stack testing. Quickly determine velocity and volume flow by inputting stack size and gas conditions, eliminating the need for manual calculations or laptops. It also aids in calculating differential pressure cell mA output for data logging.

**Highlights:** Velocity and volume flow calculations, Input stack size and gas conditions, Differential pressure cell mA output calculation, Preloaded Engineers Note Book content, On-site calculation tool

**Features:** macOS Compatibility

**In-app purchases:** none


### ControlPlus2

[App page](https://appshunter.io/ios/app/controlplus2/id6444723892)

Manage your Orisec intruder alarm system remotely from your smartphone or tablet. Gain complete visibility, receive real-time notifications, and control multiple sites with an intuitive interface. Secure login options ensure quick and safe access to your system's status and events.

**Highlights:** Remote system access, Biometric login, Multi-site control, Arm/disarm alarm, Real-time notifications, Zone status monitoring, Device control

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

**In-app purchases:** none


## Frequently asked questions

### Is Stack Testers Flow Friend free?

Stack Testers Flow Friend is free to download, with no in-app purchases.

### Is ControlPlus2 free?

ControlPlus2 is free to download, with no in-app purchases.

### Do Stack Testers Flow Friend or ControlPlus2 have ads?

Neither Stack Testers Flow Friend nor ControlPlus2 shows ads.

### Which is updated more often, Stack Testers Flow Friend or ControlPlus2?

Stack Testers Flow Friend ships an update every 8 months, and ControlPlus2 every 3 months. Most recently, Stack Testers Flow Friend was updated on October 5, 2026 and ControlPlus2 on October 8, 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.*