# Centrifugal Pump Spec vs pH

The clearest difference is price: pH at Free against Centrifugal Pump Spec's $5.99. pH also leads on update cadence (monthly vs every 11 months) and iOS requirement (7.1 vs 14.3). On ads, in-app purchases and device support there is nothing between them.

pH is free to download; Centrifugal Pump Spec costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Centrifugal Pump Spec ships an update every 11 months, pH monthly. The most recent releases landed on October 6, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Centrifugal Pump Spec | pH |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Monthly** |
| Size | 1 MB | 2 MB |
| Requires iOS | 14.3 | **7.1** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [taskit](https://appshunter.io/developer/830597040) |

## What reviewers say

### Centrifugal Pump Spec

[App page](https://appshunter.io/ios/app/centrifugal-pump-spec/id482488028)

**Features:** macOS Compatibility

**In-app purchases:** none


### pH

[App page](https://appshunter.io/ios/app/ph-meter/id830597037)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Centrifugal Pump Spec free?

Centrifugal Pump Spec costs $5.99, with no in-app purchases.

### Is pH free?

pH is free to download, with no in-app purchases.

### Do Centrifugal Pump Spec or pH have ads?

Neither Centrifugal Pump Spec nor pH shows ads.

### Which is updated more often, Centrifugal Pump Spec or pH?

Centrifugal Pump Spec ships an update every 11 months, and pH monthly. Most recently, Centrifugal Pump Spec was updated on October 6, 2026 and pH on October 26, 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.*