Pupil.Size vs StimuliApp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pupil.Size
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.
- Real-time pupil diameter measurement
- Uses device camera
- Pupil size analysis
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Pupil.Size is an application which can measure the diameter of a pupil in real time using iPod touch camera.
StimuliApp
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.
- 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
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StimuliApp is an app designed to create psychophysical tests with precise timing on iOS devices (iPad and iPhone). Psychophysical tests are tests to assess perceptual capabilities. With a simple system of menus, different types of tests including the most common stimuli (gabors, random dots, images, sounds and videos among others) can be created. Programming skills are not necessary. Features: - Precise timing (frames are not dropped) thanks to the use of the native framework Metal, which provides a direct access to the GPU of the iOS device. - Option to run tests at 60 or 120 Hz depending on the model of the device. - Visual and auditory stimulation are synchronized. - Interactive creation of stimuli using real-time preview. - Possibility of using different spatial and time units. - Gamma-correction features. - Automatic report generation.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Pupil.Size | StimuliApp |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 1 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | SCALAR CORP. | Rafael Marin Campos |
Customer experience
Pupil.Size
StimuliApp
In-app purchases
Pupil.Size
No in-app purchases
StimuliApp
No in-app purchases
