# Occupancy Keeper vs Fire Pump Calc

The clearest difference is update cadence: Occupancy Keeper at every 5 days against Fire Pump Calc's every 8 months. Occupancy Keeper also leads on iOS requirement (13.4 vs 15.6). 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.

Occupancy Keeper ships an update every 5 days, Fire Pump Calc every 8 months. The most recent releases landed on September 21, 2026 and August 19, 2026 respectively.

## The numbers

| Metric | Occupancy Keeper | Fire Pump Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (4 ratings)](https://appshunter.io/ios/app/fire-pump-calc/id6739542307/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 75.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 8 months |
| Monetization | — | Free |
| Size | 1 MB | 6 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HerdingElectrons](https://appshunter.io/developer/503597442) | [Justin Medeiros](https://appshunter.io/developer/1782040504) |

## What reviewers say

### Occupancy Keeper

[App page](https://appshunter.io/ios/app/occupancy-keeper/id1514499174)

**In-app purchases:** none


### Fire Pump Calc

[App page](https://appshunter.io/ios/app/fire-pump-calc/id6739542307)

This professional hydraulic calculator assists fire service professionals and students with complex calculations for pump operations. It accurately determines pump discharge pressure, friction loss, elevation changes, and appliance pressure loss, all designed for real-world fireground scenarios. The app works offline and requires no account for immediate use.

**Highlights:** Pump Discharge Pressure (PDP) calculation, Friction loss for any hose lay, Elevation gain and loss calculation, Appliance pressure loss, Nozzle pressure calculation, Offline functionality, No account required

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Occupancy Keeper free?

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

### Is Fire Pump Calc free?

Fire Pump Calc is free to download, with no in-app purchases.

### Do Occupancy Keeper or Fire Pump Calc have ads?

Neither Occupancy Keeper nor Fire Pump Calc shows ads.

### Which is updated more often, Occupancy Keeper or Fire Pump Calc?

Occupancy Keeper ships an update every 5 days, and Fire Pump Calc every 8 months. Most recently, Occupancy Keeper was updated on September 21, 2026 and Fire Pump Calc on August 19, 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.*