Mysk Inc.Loupe: What Apps Can See Customer Service
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.
Loupe: What Apps Can See App Comments & Reviews
Loupe: What Apps Can See Positive Reviews
Wild Access By Apps!Deleted the last few non privacy focused apps after seeing what this app exposes and is available to every app installed on iOS. Using Psylo (very inexpensive for what it is) with PWAs to try and get closer to the “privacy” apple markets. Awesome apps by team mysk!.Version: 1.0.0
Thanks - very informativeWell, I discovered this through an article in Apple News. Some of what this app reveals is more than a little scary, but also reassuring to see that you have most stuff locked down as far as possible. I find it very informative, thank you very much. I’ll be telling several folk about this app..Version: 1.0.0
Informative, simple, and a little scary.This app does what it says, and does it perfectly. Shining a light on all the info Apple gives away, without permission, to applications..Version: 1.0.0
Very insightfulProvides additional details not previously consider even for someone that has created, developed, and deconstructs many apps….Version: 1.0.0
CrazyShows literally everything an app can track. Truly eye opening..Version: 1.0.0
Fascinating!I always wondered why apps were promoting me to access things that seemed unrelated (or peripheral) to their purpose. Now I know!.Version: 1.0.0
EssentialEssential for fully understanding what apps can access with no permission. Great work from the devs!.Version: 1.0.0
Great privacy toolThank you for making this.Version: 1.0.0
Exposes so muchThis app is very needed for raising awareness on how much apple isn't doing to protect our privacy.Version: 1.0.0
A mustI was shocked to know that ios shares way much data then we thought, even feels invasive.Version: 1.0.0
SheeeetApple iPhone not secured enough..Version: 1.0.0
Very coolAwesome they are bringing attention to these fjngerprintable attributes.Version: 1.0.0
FunIts cool to see these details.Version: 1.0.0
OmgOmg,.Version: 1.0.0
👻好吓人啊.Version: 1.0.0
Уникальное приложениеМаксимально доходчего, вот бы еще добавить варианты противодействия по каждому пункту..Version: 1.0.1
Got everything..Version: 1.0.1
Too good for the App StoreInb4 Apple bans it for exposing their lies.Version: 1.0.1
Apple is complicit 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!.Version: 1.0.1
HelpfulReally glad I found this app. Such a useful resource.Version: 1.0.1
Eye opening!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..Version: 1.0.1
Informative. Brilliantly SimplisticYeah “fingerprinting” is a form of identifying and tracking you digitally, exploiting your information and you online. But how exactly? By what means? And how do you measure that? No better way to explain than demonstrate than by picking up your very own, go to, most used “computer” — your iPhone. Let Loupe do the walking. You can’t help but watch and learn. It’s personal. It’s your device. Excellent demonstration for a reliable lesson in digital tracking but WITHOUT the online exploitation..Version: 1.0.1
好有趣的 app感谢科普知识.Version: 1.0.1
Best app everIt informed me of the fact that apps can learn so much about me from a little but of data that i allow them to have. Its so magical really..Version: 1.0.1
Love itSaw this app mentioned on the Hacker News feed and am loving it. awesome.Version: 1.0.1
Awesome App to help visualise privacyGreat app helps ppl to visualise privacy.Version: 1.0.1
Insightful appWas interesting to see what all is available to the apps via the platform even in the no-permissions mode. thank you..Version: 1.0.1
Great explanation of how iPhone tracking worksBy using data from your iPhone the types of data that can be publicly collected is made much easier to understand..Version: 1.0.1
Techlore Was RightThis app is unbelievable. It does exactly what it says giving me an extremely delayed existential crisis about my “privacy”..Version: 1.0.1
Will help me persuade my friends who don’t care about privacy:)Title.Version: 1.0.1
Perfectly executed!The general public NEEDS to know about this app, it's even open source and presents the information in an easily understandable way for not tech-savvy people.Version: 1.0.1
Delicious with maple syrup.Everyone should try this app. Then go through all the scary information it provides and stay up all night being fearful about the 10,000 apps you have accumulated on your iPad and iPhones. Its fun! Be careful with the maple syrup though. I took my phone out of my pocket and found pocket lint stuck to the syrup. I had to give the phone to a Labrador Retriever for a thorough tongue washing. Its clean now, and works great, but I can only use it on speaker because when I hold it close to my face the intense smell of doggie breath gives me an irresistible urge to chase tennis balls. The first time it happened I ran out in the street and was almost run over by a postal delivery truck. I was okay, but I ended up chasing the truck for three blocks, barking loudly..Version: 1.0.1
Eye openingThis app is very nice and very eye opening. I hope Apple removes the level of detail some of the APIs provide to permissionless apps. Clipboard counter and device setup timestamp are mind boggling to me. This also explains why so many companies want you to use an app instead of a mobile browser..Version: 1.0.0
Great insightsOverall really great app with simple interface.Version: 1.0.0
IlluminatingThis needs to be widespread knowledge.Version: 1.0.1
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