# DO Calcs Buddy vs First In Navigation

The clearest difference is review sentiment: DO Calcs Buddy at 100% against First In Navigation's 36%. DO Calcs Buddy also leads on rating (4.8 vs 2.8) and in-app purchases (none vs 1). First In Navigation's advantage is update cadence (weekly vs monthly) and ratings volume (18 vs 4). On price, ads and iOS requirement there is nothing between them.

Both are free to download. First In Navigation sells 1 in-app purchase, starting at $1.99 per month. DO Calcs Buddy asks for nothing beyond the download.

DO Calcs Buddy holds the better App Store score, 4.8 against 2.8. Both are backed by a comparable volume of ratings — 4 and 18 respectively. Written reviews point the same way: 100% of DO Calcs Buddy's written reviews are positive against 36% of First In Navigation's.

DO Calcs Buddy ships an update monthly, First In Navigation weekly. Both last shipped on October 9, 2026.

## The numbers

| Metric | DO Calcs Buddy | First In Navigation |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/do-calcs-buddy/id6749918102/reviews)** | [2.8 (18 ratings)](https://appshunter.io/ios/app/first-in-navigation/id6751251373/reviews) |
| Number of ratings | 4 | **18** |
| Positive reviews | **100.0% of reviews** | 36.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 71 MB | 61 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Max McCoy](https://appshunter.io/developer/1832824815) | [Joseph Graff](https://appshunter.io/developer/1834264237) |

## 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


### First In Navigation

[App page](https://appshunter.io/ios/app/first-in-navigation/id6751251373)

This app helps first responders learn their response areas with interactive quizzes. It generates random calls within custom-drawn zones and provides optimal routes from stations or hospitals. Users can save and share maps, and access a database of community-created routes.

**Highlights:** Custom response area mapping, Randomized call generation, Route quizzing from stations/hospitals, Save and share custom maps, Community map database, Cross-platform account access

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Membership | $1.99 | per month |


## Frequently asked questions

### Is DO Calcs Buddy free?

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

### Is First In Navigation free?

First In Navigation is free to download, with in-app purchases available.

### Which has better reviews, DO Calcs Buddy or First In Navigation?

DO Calcs Buddy is rated higher. DO Calcs Buddy averages 4.8 out of 5 from 4 ratings, while First In Navigation averages 2.8 from 18 ratings.

### Do DO Calcs Buddy or First In Navigation have ads?

Neither DO Calcs Buddy nor First In Navigation shows ads.

### Which is updated more often, DO Calcs Buddy or First In Navigation?

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