# DO Calcs Buddy vs FirePumpSim

The clearest difference is in-app purchases: DO Calcs Buddy at none against FirePumpSim's 1. DO Calcs Buddy also leads on ratings volume (4 vs 1). FirePumpSim's advantage is update cadence (weekly vs monthly) and rating (5.0 vs 4.8). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. FirePumpSim sells 1 one-off in-app purchase. DO Calcs Buddy asks for nothing beyond the download.

FirePumpSim holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

DO Calcs Buddy ships an update monthly, FirePumpSim weekly. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | DO Calcs Buddy | FirePumpSim |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (4 ratings)](https://appshunter.io/ios/app/do-calcs-buddy/id6749918102/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/firepumpsim-driver-operator/id6768447355/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free | Free |
| Size | 71 MB | 158 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Max McCoy](https://appshunter.io/developer/1832824815) | [David Gallaher](https://appshunter.io/developer/1845724915) |

## What reviewers say

### DO Calcs Buddy

[App page](https://appshunter.io/ios/app/do-calcs-buddy/id6749918102)

This app helps firefighters and engineers perform hoseline calculations for training and certification. It offers customizable settings for specific departments and includes interactive study modes for various pump operator topics. The tool is designed for offline use and provides quick reference field topics.

**Highlights:** Hoseline Calculator with custom segments, Friction loss, PDP, GPM, Nozzle Reaction, Customizable hose and nozzle settings, Interactive study mode with randomized questions, Offline functionality, Quick reference field topics

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

**In-app purchases:** none


### FirePumpSim

[App page](https://appshunter.io/ios/app/firepumpsim-driver-operator/id6768447355)

This app offers realistic pump-pressure practice for firefighters and driver/operators. It helps users work through visual fireground scenarios, calculate pump pressure, and understand friction loss with real-world fire service hydraulics.

**Highlights:** Realistic pump-pressure practice, Visual fireground scenarios, Pump pressure calculations, Friction loss practice, Teaching feedback on hydraulics, Scenario library and daily challenges

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pump Operations Pack 1 | $1.99 | one-time |


## Frequently asked questions

### Is DO Calcs Buddy free?

DO Calcs Buddy is free to download, with no in-app purchases.

### Is FirePumpSim free?

FirePumpSim is free to download, with in-app purchases available.

### Which has better reviews, DO Calcs Buddy or FirePumpSim?

FirePumpSim is rated higher. DO Calcs Buddy averages 4.8 out of 5 from 4 ratings, while FirePumpSim averages 5.0 from 1 ratings.

### Do DO Calcs Buddy or FirePumpSim have ads?

Neither DO Calcs Buddy nor FirePumpSim shows ads.

### Which is updated more often, DO Calcs Buddy or FirePumpSim?

DO Calcs Buddy ships an update monthly, and FirePumpSim weekly. Most recently, DO Calcs Buddy was updated on October 9, 2026 and FirePumpSim 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.*