# Fire Pump Operator vs TriTab Calc Flex

The clearest difference is price: Fire Pump Operator at Free against TriTab Calc Flex's $1.99. Fire Pump Operator also leads on ads (none vs shown) and device support (3 vs 1). TriTab Calc Flex's advantage is update cadence (every 5 days vs every 6 weeks). On in-app purchases there is nothing between them.

Fire Pump Operator is free to download; TriTab Calc Flex costs $1.99 up front. Fire Pump Operator sells 2 in-app purchases, starting at $1.99 per month and TriTab Calc Flex sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Fire Pump Operator ships an update every 6 weeks, TriTab Calc Flex every 5 days. Both last shipped on October 24, 2026.

## The numbers

| Metric | Fire Pump Operator | TriTab Calc Flex |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Monetization | Paid | — |
| Size | 48 MB | 6 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Digital Training Systems Incorporated](https://appshunter.io/developer/320642446) | [HIROKI MURAI](https://appshunter.io/developer/6785739401) |

## What reviewers say

### Fire Pump Operator

[App page](https://appshunter.io/ios/app/fire-pump-operator/id1044180312)

This app assists fire pump operators in calculating engine pressure using a standard formula. It allows for the addition of multiple friction losses, appliances, and elevations, and offers the ability to save and modify entries. Users can also adjust default coefficients and access other relevant calculators.

**Highlights:** Engine Pressure calculation, Add friction losses, appliances, elevations, Save and modify entries, Adjust IFSTA coefficients, Head Pressure calculator, NFA Formula calculator

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fire Pump Operator Pro | $1.99 | per month |
| Fire Pump Operator Pro | $19.99 | per year |


### TriTab Calc Flex

[App page](https://appshunter.io/ios/app/tritab-calc-flex-calculator/id6793307201)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Scientific Calculator Pack | $1.99 | one-time |
| Display & Ad-Free Pack | $2.99 | one-time |


## Frequently asked questions

### Is Fire Pump Operator free?

Fire Pump Operator is free to download, with in-app purchases available.

### Is TriTab Calc Flex free?

TriTab Calc Flex costs $1.99, and also offers in-app purchases.

### Do Fire Pump Operator or TriTab Calc Flex have ads?

TriTab Calc Flex shows ads; Fire Pump Operator does not.

### Which is updated more often, Fire Pump Operator or TriTab Calc Flex?

Fire Pump Operator ships an update every 6 weeks, and TriTab Calc Flex every 5 days. Most recently, Fire Pump Operator was updated on October 24, 2026 and TriTab Calc Flex on October 24, 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.*