# Pupil.Size vs ETPhone

The clearest difference is rating: ETPhone at 3.0 against Pupil.Size's 1.0. Pupil.Size's advantage is update cadence (every 2 months vs every 16 months) and iOS requirement (11.0 vs 16). On price, review sentiment, ratings volume and ads there is nothing between them.

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

ETPhone holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 6 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

Pupil.Size ships an update every 2 months, ETPhone every 16 months. The most recent releases landed on October 7, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Pupil.Size | ETPhone |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (4 ratings)](https://appshunter.io/ios/app/pupilsize/id1356860766/reviews) | **[3.0 (6 ratings)](https://appshunter.io/ios/app/etphone/id1529643726/reviews)** |
| Number of ratings | 4 | **6** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 16 months |
| Monetization | Free | Free |
| Size | 1 MB | 1 MB |
| Requires iOS | **11.0** | 16 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [SCALAR CORP.](https://appshunter.io/developer/374875261) | [Argus Science, LLC](https://appshunter.io/developer/1529643728) |

## 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


### ETPhone

[App page](https://appshunter.io/ios/app/etphone/id1529643726)

This application enables real-time gaze computation and recording for eye tracking data collection using a compatible wearable device. It offers control over camera settings, participant calibration, and data recording to an SD card. Collected data can be easily transferred for detailed analysis on a PC.

**Highlights:** Real-time gaze computation, Gaze data recording, Camera gain and quality control, Participant calibration, SD card recording control, Data download for PC analysis

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

**In-app purchases:** none


## Frequently asked questions

### Is Pupil.Size free?

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

### Is ETPhone free?

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

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

ETPhone is rated higher. Pupil.Size averages 1.0 out of 5 from 4 ratings, while ETPhone averages 3.0 from 6 ratings.

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

Neither Pupil.Size nor ETPhone shows ads.

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

Pupil.Size ships an update every 2 months, and ETPhone every 16 months. Most recently, Pupil.Size was updated on October 7, 2026 and ETPhone on October 10, 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.*