# Biological Buffer Calculator vs Centrifugal Pump Spec

The clearest difference is price: Biological Buffer Calculator at Free against Centrifugal Pump Spec's $5.99. Biological Buffer Calculator also leads on iOS requirement (8.0 vs 14.3). Centrifugal Pump Spec's advantage is update cadence (every 11 months vs every 77 months). On ads, in-app purchases and device support there is nothing between them.

Biological Buffer Calculator 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.

Biological Buffer Calculator ships an update every 77 months, Centrifugal Pump Spec every 11 months. The most recent releases landed on October 23, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Biological Buffer Calculator | Centrifugal Pump Spec |
| --- | --- | --- |
| Price | **Free** | $5.99 |
| Rating | **[2.6 (8 ratings)](https://appshunter.io/ios/app/biological-buffer-calculator/id408368126/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 77 months | **Every 11 months** |
| Monetization | Free | — |
| Size | 5 MB | 1 MB |
| Requires iOS | **8.0** | 14.3 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wiley](https://appshunter.io/developer/334132751) | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) |

## What reviewers say

### Biological Buffer Calculator

[App page](https://appshunter.io/ios/app/biological-buffer-calculator/id408368126)

This utility app assists chemists and biochemists in preparing precise buffer solutions. Users input desired volume, pH, and concentration, along with stock solution details, to receive exact mixing instructions.

**Highlights:** Buffer system selection, Volume, pH, and concentration input, Stock solution concentration input, Precise mixing volume calculation, Pocket companion for labs

**Features:** Vision Pro support

**In-app purchases:** none


### Centrifugal Pump Spec

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Biological Buffer Calculator free?

Biological Buffer Calculator is free to download, with no in-app purchases.

### Is Centrifugal Pump Spec free?

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

### Do Biological Buffer Calculator or Centrifugal Pump Spec have ads?

Neither Biological Buffer Calculator nor Centrifugal Pump Spec shows ads.

### Which is updated more often, Biological Buffer Calculator or Centrifugal Pump Spec?

Biological Buffer Calculator ships an update every 77 months, and Centrifugal Pump Spec every 11 months. Most recently, Biological Buffer Calculator was updated on October 23, 2026 and Centrifugal Pump Spec on October 6, 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.*