# Pupil.Size vs StimuliApp

The clearest difference is rating: StimuliApp at 5.0 against Pupil.Size's 1.0. Pupil.Size's advantage is ratings volume (4 vs 1) and iOS requirement (11.0 vs 13.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

StimuliApp holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

Pupil.Size ships an update every 2 months, StimuliApp every 6 weeks. The most recent releases landed on October 7, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Pupil.Size | StimuliApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (4 ratings)](https://appshunter.io/ios/app/pupilsize/id1356860766/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stimuliapp/id1497026540/reviews)** |
| Number of ratings | **4** | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 1 MB | 10 MB |
| Requires iOS | **11.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SCALAR CORP.](https://appshunter.io/developer/374875261) | [Rafael Marin Campos](https://appshunter.io/developer/1497026539) |

## What reviewers say

### Pupil.Size

[App page](https://appshunter.io/ios/app/pupilsize/id1356860766)

This utility app uses your device's camera to measure pupil diameter in real time. It's designed for quick and easy pupil size analysis.

**Highlights:** Real-time pupil diameter measurement, Uses device camera, Pupil size analysis

**Features:** macOS Compatibility

**In-app purchases:** none


### StimuliApp

[App page](https://appshunter.io/ios/app/stimuliapp/id1497026540)

Create precise psychophysical tests on iOS devices without programming. Assess perceptual capabilities using various stimuli like images, sounds, and videos with synchronized visual and auditory output. Features include real-time preview and automatic report generation.

**Highlights:** Precise timing with Metal framework, 60 or 120 Hz test options, Synchronized visual and auditory stimulation, Interactive stimulus creation with preview, Automatic report generation, Gamma-correction features

**In-app purchases:** none


## Frequently asked questions

### Is Pupil.Size free?

Pupil.Size is free to download, with no in-app purchases.

### Is StimuliApp free?

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

### Which has better reviews, Pupil.Size or StimuliApp?

StimuliApp is rated higher. Pupil.Size averages 1.0 out of 5 from 4 ratings, while StimuliApp averages 5.0 from 1 ratings.

### Do Pupil.Size or StimuliApp have ads?

Neither Pupil.Size nor StimuliApp shows ads.

### Which is updated more often, Pupil.Size or StimuliApp?

Pupil.Size ships an update every 2 months, and StimuliApp every 6 weeks. Most recently, Pupil.Size was updated on October 7, 2026 and StimuliApp on September 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*