# Keystone Pump TDH Calculator vs Cornell Pump Toolkit

The clearest difference is update cadence: Keystone Pump TDH Calculator at every 6 months against Cornell Pump Toolkit's every 29 months. Cornell Pump Toolkit's advantage is device support (3 vs 1) and ratings volume (3 vs 1). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Keystone Pump TDH Calculator against 5.0 for Cornell Pump Toolkit. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Keystone Pump TDH Calculator ships an update every 6 months, Cornell Pump Toolkit every 29 months. The most recent releases landed on May 31, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Keystone Pump TDH Calculator | Cornell Pump Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/keystone-pump-tdh-calculator/id880925443/reviews) | [5.0 (3 ratings)](https://appshunter.io/ios/app/cornell-pump-toolkit/id982062017/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 29 months |
| Monetization | Free | Free |
| Size | 3 MB | 22 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Keystone Pumps LTD](https://appshunter.io/developer/435839301) | [Cornell Pump Company](https://appshunter.io/developer/879210510) |

## What reviewers say

### 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


### Cornell Pump Toolkit

[App page](https://appshunter.io/ios/app/cornell-pump-toolkit/id982062017)

This utility app helps calculate key centrifugal pump performance metrics like head, suction, and friction loss. It also suggests suitable pumps from a catalog and allows saving and sharing results. It's designed for field use on Apple devices, functioning offline.

**Highlights:** Calculate Total Dynamic Head, Calculate Net Positive Suction Head, Calculate Friction Loss, Suggest pumps from catalog, Save and share calculations, Offline functionality

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Keystone Pump TDH Calculator free?

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

### Is Cornell Pump Toolkit free?

Cornell Pump Toolkit is free to download, with no in-app purchases.

### Which has better reviews, Keystone Pump TDH Calculator or Cornell Pump Toolkit?

Keystone Pump TDH Calculator and Cornell Pump Toolkit are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.

### Do Keystone Pump TDH Calculator or Cornell Pump Toolkit have ads?

Neither Keystone Pump TDH Calculator nor Cornell Pump Toolkit shows ads.

### Which is updated more often, Keystone Pump TDH Calculator or Cornell Pump Toolkit?

Keystone Pump TDH Calculator ships an update every 6 months, and Cornell Pump Toolkit every 29 months. Most recently, Keystone Pump TDH Calculator was updated on May 31, 2026 and Cornell Pump Toolkit on September 23, 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.*