# Loupe: What Apps Can See — Privacy & Security Guide

> App reveals device fingerprinting details used by advertisers. (iPhone/iPad app by Mysk Inc..)

- Source: https://appshunter.io/ios/app/loupe-what-apps-can-see/id6766152470 (this page in markdown: same URL + `.md`)
- Developer: [Mysk Inc.](https://appshunter.io/developer/394912964)
- Category: Developer Tools, Utilities
- Price: Free
- Rating: 5.00/5 from 404 App Store ratings · 74 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 8 MB
- Languages: American English, Arabic, French (France), German (Germany), Italian, Japanese, Korean, Polish, Brazilian Portuguese, Russian and 6 more
- Released: 2026-06-05
- Data updated: 2026-09-02
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/loupe-what-apps-can-see/id6766152470/reviews.md

## What is Loupe?

Ever wondered how advertisers recognize you across apps and websites? It usually comes down to fingerprinting: small, ordinary details about your device, combined until the mix is rare enough to point back to you.

Loupe lets you see those details yourself. It reads the same public iOS APIs that third-party apps use, showing you the raw data and explaining why it matters.

WHAT YOU CAN EXPLORE
Trackers don't need your name, email, or location to recognize you. Your region, languages, settings, storage, and sensors create a pattern distinctive enough to follow you online. Loupe puts these readings in one place so you can see exactly what you're sharing.

THREE LEVELS OF ACCESS
Loupe sorts every reading by how much access it takes:

- Passive: readable by any app with no prompt at all, from your time zone and keyboard languages to your battery and storage.
- Needs permission: readings that trigger an iOS prompt, like location, contacts, photos, and motion.
- Advanced: side channels that public APIs allow, like checking which apps you have installed, graphics checks in a hidden browser, and a record that survives reinstalling the app.

NOTHING LEAVES YOUR IPHONE
Loupe reads everything on your device and keeps it there. Nothing is uploaded, synced, or shared unless you export it yourself. There are no accounts and no analytics.

A FEW THINGS YOU CAN LOOK AT
- The region, languages, and settings that hint at where you live and travel
- Your screen, graphics, storage, and battery details
- The name on a paired accessory, which often gives away your own name
- Which popular apps you have installed, worked out without any permission
- The exact second your device was set up or last erased

Loupe is built by Mysk, a security research team. It exposes the tracking surface of your iPhone, so you can decide what to do about it.

## Key features

- See device fingerprinting data
- Understand data access levels
- View passive data
- Check permission-based data
- Explore advanced data
- Data stays on device

## Chart rankings

- #117 in Top Free · Developer Tools (US App Store)

## Recent user reviews (10 of 74)

All indexed reviews: https://appshunter.io/ios/app/loupe-what-apps-can-see/id6766152470/reviews.md

### 5/5 — perfect

*2026-08-07, version 1.0.1*

perfect app and does what it says. i wish there was an android version

### 5/5 — Thank you

*2026-07-14, version 1.0.1*

You’re important

### 5/5 — What “Privacy & Security” should be

*2026-07-14, version 1.0.1*

Incredibly eye opening. I highly suggest this app to those whom are seeking the nitty-gritty that Settings’ “Privacy & Security” simply doesn’t provide.

Of all three API categories, “Passive” bewildered me the most, surprisingly. I’m no programmer, although I’ve known about iOS API’s since forever. I had no idea they returned so much information. Battery status; audio volume; display; and device motion, just to name a few, were the most telling for what would seem insignificant by themselves.

### 5/5 — Уникальное приложение

*2026-07-02, version 1.0.1*

Максимально доходчего, вот бы еще добавить варианты противодействия по каждому пункту.

### 5/5 — Got everything

*2026-07-02, version 1.0.1*

.

### 5/5 — Too good for the App Store

*2026-07-01, version 1.0.1*

Inb4 Apple bans it for exposing their lies

### 5/5 — Apple is complicit 🫪

*2026-07-01, version 1.0.1*

Apple iOS is as bad as (if not, worse) than Google browsers. I’m writing this review before I throw my phone in the trash. I’m kidding, at least for now, but this is the first app I’ve seen demonstrate to a great extent the variables apps can use to build a fingerprint. It’d be cool to see some recommendations as to how we can potentially reduce the surface that apps are able to access, if possible, and maybe a demonstration of (opt-in) fingerprinting via Firebase (crashlytics?) and the despicable persistent keychain data that can’t be deleted that apps use to fingerprint. Looking forward to future updates!

### 5/5 — illuminating

*2026-06-30, version 1.0.1*

this needs to be widespread knowledge

### 5/5 — Helpful

*2026-06-29, version 1.0.1*

Really glad I found this app. Such a useful resource

### 5/5 — Eye opening!

*2026-06-27, version 1.0.1*

When they told me that any app could see exactly when my phone was activated, write down to the second, it helped me comprehend how easy it is for them to identify me and track me. I mean, how many of my exact model of phone were activated at the exact second I activated my phone? This app is really starting to make me aware that I need to take steps to protect my privacy.

## Frequently asked questions about Loupe

### What is Loupe?

Loupe is a privacy and security guide that shows you the device details advertisers use for fingerprinting. It helps you understand what information your iPhone is sharing online without your explicit consent.

### How does Loupe work?

Loupe reads public iOS APIs to display raw data about your device's region, languages, settings, storage, and sensors. It explains why these details matter for online tracking.

### Does Loupe collect my data?

No, Loupe is designed with privacy as a core feature. All data is read on your device and kept there; nothing is uploaded, synced, or shared unless you choose to export it yourself.

### What kind of data can I see with Loupe?

You can explore passive data like time zone and keyboard languages, data requiring permission such as location and photos, and advanced data like installed apps and graphics checks.

### Is Loupe free to use?

Yes, Loupe is completely free to download and use. There are no in-app purchases or subscription fees required to access its features.

### What devices does Loupe support?

Loupe is available for iPhone and iPad. It is designed to run on iOS devices.

### How often is Loupe updated?

The latest version of Loupe is 1.0.1, and it was last updated on June 12, 2026. Updates typically address bug fixes and may introduce new features or data insights.

### Does Loupe have ads?

No, Loupe does not contain any advertisements. It is a completely ad-free application, ensuring an uninterrupted user experience.

## Version history (last 2 releases)

### 1.0.1 — 2026-06-12

- Photos now asks for your permission before it looks up place names for your photo locations.
- New language support: Korean, Polish, Italian, and Vietnamese.
- Fixed the Steam URL scheme, thanks to @Solarphlare.
- Small interface refinements.
- Small localization refinements.

### 1.0.0 — 2026-06-05

No release notes.

## More apps by Mysk Inc.

- [TextCrafter 2 ~ Craft & Share](https://appshunter.io/ios/app/textcrafter-2-craft-and-share/id394912961)
- [Ctrl ~ A Remote for your Watch](https://appshunter.io/ios/app/ctrl-a-remote-for-your-watch/id986081293)
- [Canvas ~ Draw Together](https://appshunter.io/ios/app/canvas-draw-together/id1055474385)
- [Psylo: Privacy Browser & Proxy](https://appshunter.io/ios/app/psylo-privacy-browser-and-proxy/id6741358035)

All apps by Mysk Inc.: https://appshunter.io/developer/394912964

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-02.*