# Biological Buffer Calculator vs Fishful

The clearest difference is price: Biological Buffer Calculator at Free against Fishful's $0.99. Biological Buffer Calculator also leads on in-app purchases (none vs 1) and ratings volume (8 vs 1). Fishful's advantage is rating (5.0 vs 2.6) and update cadence (weekly vs every 77 months). On ads and device support there is nothing between them.

Biological Buffer Calculator is free to download; Fishful costs $0.99 up front. Fishful sells 1 one-off in-app purchase. Biological Buffer Calculator asks for nothing beyond the download.

Fishful holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: Biological Buffer Calculator has 8 ratings behind it against 1, so its average is the more settled of the two.

Biological Buffer Calculator ships an update every 77 months, Fishful weekly. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Biological Buffer Calculator | Fishful |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | [2.6 (8 ratings)](https://appshunter.io/ios/app/biological-buffer-calculator/id408368126/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fishful-time-widgets/id6479956760/reviews)** |
| Number of ratings | **8** | 1 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 77 months | **Weekly** |
| Monetization | **Free** | Paid |
| Size | 5 MB | 35 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Wiley](https://appshunter.io/developer/334132751) | [金美 陈](https://appshunter.io/developer/1593964034) |

## 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


### Fishful

[App page](https://appshunter.io/ios/app/fishful-time-widgets/id6479956760)

Visualize the passage of time with a minimalist countdown widget. Track important dates with multiple calendar support and customizable designs. Integrates seamlessly with Dark Mode.

**Highlights:** Minimalist countdown widget, Multi-calendar support, Customizable widget designs, Color themes, Dark Mode support, Flexible interval settings

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy me a coffee | $2.99 | one-time |


## Frequently asked questions

### Is Biological Buffer Calculator free?

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

### Is Fishful free?

Fishful costs $0.99, and also offers in-app purchases.

### Which has better reviews, Biological Buffer Calculator or Fishful?

Fishful is rated higher. Biological Buffer Calculator averages 2.6 out of 5 from 8 ratings, while Fishful averages 5.0 from 1 ratings.

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

Neither Biological Buffer Calculator nor Fishful shows ads.

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

Biological Buffer Calculator ships an update every 77 months, and Fishful weekly. Most recently, Biological Buffer Calculator was updated on October 3, 2026 and Fishful on October 10, 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.*