# Fraction Help Calculator vs Keystone Pump TDH Calculator

Fraction Help Calculator and Keystone Pump TDH Calculator both sit at 4.8 stars, but that hides the real split: 100% of Keystone Pump TDH Calculator's written reviews are positive against 50% of Fraction Help Calculator's. Keystone Pump TDH Calculator also leads on price (Free vs $2.99) and update cadence (every 6 months vs every 13 months). Fraction Help Calculator's advantage is ratings volume (12 vs 1) and device support (3 vs 1). On rating, ads and in-app purchases there is nothing between them.

Keystone Pump TDH Calculator is free to download; Fraction Help Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Keystone Pump TDH Calculator holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Fraction Help Calculator has 12 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Fraction Help Calculator's written reviews are positive against 100% of Keystone Pump TDH Calculator's.

Fraction Help Calculator ships an update every 13 months, Keystone Pump TDH Calculator every 6 months. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Fraction Help Calculator | Keystone Pump TDH Calculator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | [4.8 (12 ratings)](https://appshunter.io/ios/app/fraction-help-calculator/id413490922/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/keystone-pump-tdh-calculator/id880925443/reviews)** |
| Number of ratings | **12** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 6 months** |
| Monetization | Paid | **Free** |
| Size | 4 MB | 3 MB |
| Requires iOS | **12.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [Keystone Pumps LTD](https://appshunter.io/developer/435839301) |

## What reviewers say

### Fraction Help Calculator

[App page](https://appshunter.io/ios/app/fraction-help-calculator/id413490922)

This utility app simplifies fraction calculations and provides step-by-step solutions for addition, subtraction, multiplication, and division. It also facilitates conversions between decimals and fractions, and helps find factors of numbers.

**Highlights:** Solve fraction equations, View detailed working, Work with mixed fractions, Convert between decimal and fraction, Find factors of numbers

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

**In-app purchases:** none


### Keystone Pump TDH Calculator

[App page](https://appshunter.io/ios/app/keystone-pump-tdh-calculator/id880925443)

This utility app assists engineers and technical personnel in calculating system parameters for slurry pipe and pump sizing. It computes required head pressure and limiting settling velocity based on user-inputted system data. The tool aims to simplify the selection process for slurry pumps.

**Highlights:** Slurry Density Calculation, Limiting Settling Velocity Calculation, Slurry Head & Equivalent Water Head Calculation, Pipe Type and Size Database, NPSHA Calculation, US and Metric Units, Save Calculation Results

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fraction Help Calculator free?

Fraction Help Calculator costs $2.99, with no in-app purchases.

### Is Keystone Pump TDH Calculator free?

Keystone Pump TDH Calculator is free to download, with no in-app purchases.

### Which has better reviews, Fraction Help Calculator or Keystone Pump TDH Calculator?

Keystone Pump TDH Calculator is rated higher. Fraction Help Calculator averages 4.8 out of 5 from 12 ratings, while Keystone Pump TDH Calculator averages 5.0 from 1 ratings.

### Do Fraction Help Calculator or Keystone Pump TDH Calculator have ads?

Neither Fraction Help Calculator nor Keystone Pump TDH Calculator shows ads.

### Which is updated more often, Fraction Help Calculator or Keystone Pump TDH Calculator?

Fraction Help Calculator ships an update every 13 months, and Keystone Pump TDH Calculator every 6 months. Most recently, Fraction Help Calculator was updated on October 23, 2026 and Keystone Pump TDH Calculator on October 16, 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.*