# Biological Buffer Calculator vs iCrucible

The clearest difference is in-app purchases: Biological Buffer Calculator at none against iCrucible's 8. Biological Buffer Calculator also leads on iOS requirement (8.0 vs 17.2). iCrucible's advantage is update cadence (every 5 months vs every 77 months). On price, ads and device support there is nothing between them.

Both are free to download. iCrucible sells 8 in-app purchases, starting at $2.99 per month. Biological Buffer Calculator asks for nothing beyond the download.

Biological Buffer Calculator ships an update every 77 months, iCrucible every 5 months. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Biological Buffer Calculator | iCrucible |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 77 months | **Every 5 months** |
| Monetization | Free | — |
| Size | 5 MB | 172 MB |
| Requires iOS | **8.0** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wiley](https://appshunter.io/developer/334132751) | [RIMCS LLC](https://appshunter.io/developer/1695388876) |

## 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


### iCrucible

[App page](https://appshunter.io/ios/app/icrucible/id6468351223)

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard | $2.99 | per month |
| Premium | $4.99 | per month |
| Standard | $29.99 | per year |
| Premium | $49.99 | per year |
| 500 Flame Gems | $4.99 | one-time |
| 2,500 Flame Gems | $23.99 | one-time |
| 5,000 Flame Gems | $46.99 | one-time |
| 10,000 Flame Gems | $91.90 | one-time |


## Frequently asked questions

### Is Biological Buffer Calculator free?

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

### Is iCrucible free?

iCrucible is free to download, with in-app purchases available.

### Do Biological Buffer Calculator or iCrucible have ads?

Neither Biological Buffer Calculator nor iCrucible shows ads.

### Which is updated more often, Biological Buffer Calculator or iCrucible?

Biological Buffer Calculator ships an update every 77 months, and iCrucible every 5 months. Most recently, Biological Buffer Calculator was updated on October 3, 2026 and iCrucible on October 5, 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.*