# Device specific data with no sign-in **URL:** \ **Category:** Ask for Help\ **Created:** [February 2, 2025, 7:31pm UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730 "2025-02-02T19:31:52Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![kkkuisma](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/kkkuisma/32/84708_2.png) [@kkkuisma](https://community.glideapps.com/u/kkkuisma)\ **Post date:** [February 2, 2025, 7:31pm UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/1 "2025-02-02T19:31:53Z")
Hi! I have a public app that can be opened only with the link so there is no sign-in. Is it possible to have any data specific to the device when there are no users with email adresses? For example is it possible to everyone to have personal notes in the app, that can only be seen on the specific device without sign-in? Does the devices produce some kind of unique device IDs or some other info that can be used to specify the data to only that device? I’m still a little new to this, so sorry if this is a dumb question 😬 and thank you in advance! ---
**Author:** ![MaximeBaker](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/maximebaker/32/80877_2.png) [@MaximeBaker](https://community.glideapps.com/u/MaximeBaker)\ **Post date:** [February 2, 2025, 8:39pm UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/2 "2025-02-02T20:39:17Z")
> [@kkkuisma](#): > > Is it possible to have any data specific to the device when there are no users with email adresses? Short answer: No. Larger answer: No. Not in a secure way. Long answer: No and yes. Not secure, meaning the data will still be downloadable for other devices, but you can use the device informations to use that as a fingerprint and use that for your filters. Similar to what is done in this app: > **[CSS Library by LowCode Agency](https://css-library.glide.page/)** ---
**Author:** ![MaximeBaker](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/maximebaker/32/80877_2.png) [@MaximeBaker](https://community.glideapps.com/u/MaximeBaker)\ **Post date:** [February 2, 2025, 8:40pm UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/3 "2025-02-02T20:40:07Z")
> [@kkkuisma](#): > > For example is it possible to everyone to have personal notes in the app, that can only be seen on the specific device without sign-in? Again, not in a secure and confidential way. > [@kkkuisma](#): > > Does the devices produce some kind of unique device IDs or some other info that can be used to specify the data to only that device? Yes, there is column and action for that! ---
**Author:** ![MaximeBaker](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/maximebaker/32/80877_2.png) [@MaximeBaker](https://community.glideapps.com/u/MaximeBaker)\ **Post date:** [February 2, 2025, 8:40pm UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/4 "2025-02-02T20:40:38Z")
> [@kkkuisma](#): > > I’m still a little new to this, so sorry if this is a dumb question 😬 and thank you in advance! Don’t be sorry! We all started somewhere! ---
**Author:** ![Jeff\_Hager](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/jeff_hager/32/43_2.png) [@Jeff\_Hager](https://community.glideapps.com/u/Jeff_Hager)\ **Post date:** [February 3, 2025, 3:26am UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/5 "2025-02-03T03:26:04Z")
Here’s a couple posts with my take on the whole thing. Fingerprinting a specific user or device without them signing in is complex, not 100% reliable, not 100% foolproof, and not secure as stated above. Even using the CSS Library app as an example, it seems that it often forgets who I am whenever I visit the page and have to register each time. I would love to be able to identify a specific device for one of my use cases, but the only reliable options I have are to have a separate sign in or a separate app for that device. > [@Unique User ID that will not change for an anonymous user](https://community.glideapps.com/t/unique-user-id-that-will-not-change-for-an-anonymous-user/20139/13): > > Reliably tracking users with 100% accuracy without requiring the user to sign in is next to impossible. It’s somewhat possible using browser agent info, or attempting to collect user info without consent, but not 100% reliable. All major browsers make it very difficult to do. It’s a battle that ad agencies attempt to overcome every day, which also forces browsers to lock things down more to protect user privacy. I should add that attempting to do something like this opens up a whole bunch of… > [@Save choice with "no sign-in" User access](https://community.glideapps.com/t/save-choice-with-no-sign-in-user-access/73696/2): > > If a user is not signed in, there is no reliable way to identify which user the data belongs to. You can go down a rabbit hole of scraping together various pieces of device info to identify a user’s device, but this is challenge for even the largest advertising companies that try to track ad views. The thing is, browsers make there best effort to protect your privacy, so it’s very hard from the developer side to reliably track a specific user or link data to that user if they have not identifie… ---
**Author:** ![Darren\_Murphy](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/darren_murphy/32/47326_2.png) [@Darren\_Murphy](https://community.glideapps.com/u/Darren_Murphy)\ **Post date:** [February 3, 2025, 3:28am UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/6 "2025-02-03T03:28:21Z")
> [@Jeff\_Hager](#): > > Even using the CSS Library app as an example, it seems that it often forgets who I am whenever I visit the page and have to register each time. hehe, same. I must have about a dozen profiles registered there by now 😂 ---
**Author:** ![ThinhDinh](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/thinhdinh/32/49_2.png) [@ThinhDinh](https://community.glideapps.com/u/ThinhDinh)\ **Post date:** [February 4, 2025, 1:37am UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/7 "2025-02-04T01:37:51Z")
> [@Jeff\_Hager](#): > > Even using the CSS Library app as an example, it seems that it often forgets who I am whenever I visit the page and have to register each time. I would love to be able to identify a specific device for one of my use cases, but the only reliable options I have are to have a separate sign in or a separate app for that device. That’s true, can confirm this as the creator. That’s not a way I would recommend anyone else to go through. It’s complex, and not reliable. ---
**Author:** ![MaximeBaker](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/maximebaker/32/80877_2.png) [@MaximeBaker](https://community.glideapps.com/u/MaximeBaker)\ **Post date:** [February 4, 2025, 2:43am UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/8 "2025-02-04T02:43:44Z")
That said, I am in the same minding than you. But, in the last resort, it still works. Not the best practice, but still works if needed 😝 ---
**Author:** ![MaximeBaker](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/maximebaker/32/80877_2.png) [@MaximeBaker](https://community.glideapps.com/u/MaximeBaker)\ **Post date:** [February 4, 2025, 2:44am UTC](https://community.glideapps.com/t/device-specific-data-with-no-sign-in/79730/9 "2025-02-04T02:44:51Z")
Wanna bet who have more? 😝😂