# Calculator T vs Combinations & Probabilities

The clearest difference is in-app purchases: Calculator T at none against Combinations & Probabilities's 1. Calculator T also leads on ads (none vs shown) and update cadence (every 2 days vs weekly). On price there is nothing between them.

Both are free to download. Combinations & Probabilities sells 1 one-off in-app purchase. Calculator T asks for nothing beyond the download.

Calculator T ships an update every 2 days, Combinations & Probabilities weekly. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Calculator T | Combinations & Probabilities |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 2 days** | Weekly |
| Monetization | Free | — |
| Size | 16 MB | 33 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | +4 |
| Developer | [Xiao Hou Yi Sheng Traditional Chinese Medicine Technology (Shenzhen) Co., Ltd](https://appshunter.io/developer/1524258136) | [Joao Carrion](https://appshunter.io/developer/1044104256) |

## What reviewers say

### Calculator T

[App page](https://appshunter.io/ios/app/calculator-t/id6473983653)

This app offers advanced scientific calculation and unit conversion capabilities. It features a history tape, memory functions, and supports complex mathematical operations. It also includes currency exchange rates and a wide range of measurement conversions.

**Highlights:** Standard and scientific function modes, Extensive unit conversion (over 300 units), History tape for last 100 records, Memory buttons (MS, M+, M-, MR, MC), Copy/paste functionality for equations and results, Support for large number calculations and scientific notation, Currency exchange rate conversion

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Combinations & Probabilities

[App page](https://appshunter.io/ios/app/combinations-and-probabilities/id6758729922)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C&P Pro | $2.99 | one-time |


## Frequently asked questions

### Is Calculator T free?

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

### Is Combinations & Probabilities free?

Combinations & Probabilities is free to download, with in-app purchases available.

### Do Calculator T or Combinations & Probabilities have ads?

Combinations & Probabilities shows ads; Calculator T does not.

### Which is updated more often, Calculator T or Combinations & Probabilities?

Calculator T ships an update every 2 days, and Combinations & Probabilities weekly. Most recently, Calculator T was updated on November 4, 2026 and Combinations & Probabilities on October 28, 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.*