# Biological Buffer Calculator vs CO2 Filter Calc

The clearest difference is update cadence: CO2 Filter Calc at weekly against Biological Buffer Calculator's every 77 months. Biological Buffer Calculator's advantage is iOS requirement (8.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Biological Buffer Calculator ships an update every 77 months, CO2 Filter Calc weekly. The most recent releases landed on June 5, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Biological Buffer Calculator | CO2 Filter Calc |
| --- | --- | --- |
| Price | Free | Free |
| 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 | **Weekly** |
| Monetization | Free | — |
| Size | 5 MB | 1 MB |
| Requires iOS | **8.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wiley](https://appshunter.io/developer/334132751) | [TOMCO2 Systems Company](https://appshunter.io/developer/1683554220) |

## 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

**In-app purchases:** none


### CO2 Filter Calc

[App page](https://appshunter.io/ios/app/co2-filter-calc/id6448122642)

**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 CO2 Filter Calc free?

CO2 Filter Calc is free to download, with no in-app purchases.

### Do Biological Buffer Calculator or CO2 Filter Calc have ads?

Neither Biological Buffer Calculator nor CO2 Filter Calc shows ads.

### Which is updated more often, Biological Buffer Calculator or CO2 Filter Calc?

Biological Buffer Calculator ships an update every 77 months, and CO2 Filter Calc weekly. Most recently, Biological Buffer Calculator was updated on June 5, 2026 and CO2 Filter Calc on September 14, 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.*