Support

Umbr is highly resistant to screenshots, screen recordings, and someone pointing a second phone at your screen. Each frame your eyes blend into a clean image is, on its own, deliberately damaged — so any single capture, screenshot or photograph, comes out garbled.

Umbr does not protect against analog reproductions like HDMI capture cards or determined adversaries with specialized equipment. We're upfront about that on our home page.

The two protection frames alternate at up to 120 times per second. Your visual system blends them into a clean image only at high refresh rates. On 60Hz screens, you'd see visible flickering and the protection would be much weaker.

Umbr requires an iPhone with a ProMotion display (iPhone 13 Pro and later, plus iPhone Air and 17-class devices). On the web viewer, we measure your display's refresh rate and warn you if it's below 120Hz.

Yes. Recipients can open shares in any modern browser with a 120Hz display via our web viewer. Protection is reduced compared to the iOS app, but the share still works.

If they're on iPhone, tapping the link opens the Umbr app automatically (after they install it once). If they're on Android or desktop without 120Hz, the viewer warns them and they can still see the content with reduced protection.

No. Umbr never asks for your name, email, phone number, or any login. We identify your device by a hashed local identifier — never the raw value, and never linked to who you are.

No. Your iPhone encrypts every share with a one-time AES-256 key before uploading. Half the key is stored on our servers; the other half lives only in the share URL itself, in the part after the # symbol that browsers and HTTP clients never send to servers. Without both halves, decryption is mathematically impossible.

This is the same split-key approach used by reputable end-to-end encrypted services. We've designed Umbr so we couldn't read your content even if we wanted to.

You choose: 1 hour, 24 hours, 7 days (default), 30 days, 90 days, or 6 months maximum. You can also limit views (1, 5, or unlimited) and revoke any share at any time from the Recent list.

Open the share and tap the flag icon at the top. Confirm the report. The link is disabled immediately for everyone and flagged for our review. We commit to responding within 24 hours.

For more on how we handle reports, see our Trust & Safety page.

Open Umbr → Settings → Delete Account. This wipes every share you've created, every encrypted blob in our storage, your push token, and your device record. The action is immediate and cannot be undone.

Umbr's protection works by rapidly alternating frames. If you have photosensitive epilepsy or sensitivity to flicker, this could be unsafe. We require an acknowledgment during onboarding so you understand before using the app.

If you have iOS Reduce Motion enabled, Umbr will show a single static frame instead of alternating — protection is reduced, but the app remains usable.

Not yet. Android is on our roadmap. In the meantime, Android users can open Umbr links in any 120Hz browser via our web viewer, with somewhat reduced protection.

The app is free. We may offer optional paid tiers in the future for advanced features (longer expiry, larger files, custom branding for businesses), but the core protected sharing experience will always have a free tier.