# Calcular vs Underfoot

The clearest difference is in-app purchases: Underfoot at none against Calcular's 1. Underfoot also leads on iOS requirement (18.0 vs 26.0). Calcular's advantage is price ($0.99 vs $2.99). On ads and device support there is nothing between them.

Calcular costs $0.99 and Underfoot $2.99 up front. Calcular sells 1 one-off in-app purchase. Underfoot asks for nothing beyond the download.

## The numbers

| Metric | Calcular | Underfoot |
| --- | --- | --- |
| Price | **$0.99** | $2.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 19 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 19 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pierre Stanislas](https://appshunter.io/developer/1261009329) | [Robert Ortner](https://appshunter.io/developer/1215177992) |

## What reviewers say

### Calcular

[App page](https://appshunter.io/ios/app/calcular-mental-math-trainer/id1506363398)

Practice arithmetic entirely hands-free with voice commands. Problems are spoken aloud, and answers are given by speaking, allowing you to train your brain while commuting, exercising, or cooking. Features adaptive difficulty and detailed progress tracking.

**Highlights:** Fully voice-driven gameplay, Adaptive difficulty levels, Elo rating system, Times table mastery map, Streak-based challenges, Smart progress tracking, Apple Intelligence insights

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calcular premium | $2.99 | one-time |


### Underfoot

[App page](https://appshunter.io/ios/app/underfoot/id6739977204)

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

**In-app purchases:** none


## Frequently asked questions

### Is Calcular free?

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

### Is Underfoot free?

Underfoot costs $2.99, with no in-app purchases.

### Do Calcular or Underfoot have ads?

Neither Calcular nor Underfoot shows ads.

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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.*