# Questioner! vs Concentrate! IQ Trainer

Questioner! and Concentrate! IQ Trainer are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | Questioner! | Concentrate! IQ Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Monthly |
| Size | 25 MB | 31 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hernan Rodriguez](https://appshunter.io/developer/1663898627) | [christoph joshua BOLL](https://appshunter.io/developer/1631352653) |

## What reviewers say

### Questioner!

[App page](https://appshunter.io/ios/app/questioner/id6448804184)

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

**In-app purchases:** none


### Concentrate! IQ Trainer

[App page](https://appshunter.io/ios/app/concentrate-iq-trainer/id6738403503)

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

**In-app purchases:** none


## Frequently asked questions

### Is Questioner! free?

Questioner! is free to download, with no in-app purchases.

### Is Concentrate! IQ Trainer free?

Concentrate! IQ Trainer is free to download, with no in-app purchases.

### Do Questioner! or Concentrate! IQ Trainer have ads?

Neither Questioner! nor Concentrate! IQ Trainer 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.*