Invite-only notifications
Everything below rests on one rule: a channel asks, and the phone decides. What arrives is guaranteed; how loudly it arrives is not, and any page that told you otherwise was selling.
Private means sealed, not merely unlisted
A private channel is not one that is simply missing from a directory. It requires an invite code both to subscribe AND to read anything about it, and a request without one gets exactly the same “not found” as a handle that never existed — because a different answer would let anybody confirm that a school’s or an ops team’s channel exists by guessing its name. Invite codes can carry a use limit and can be revoked; revoking is a timestamp and by default removes nobody who already joined.
One handle, printed once, permanent
A channel lives at drop.top followed by its handle, and that address never changes. It cannot be edited after creation, because it ends up on a poster in a school entrance, on a festival gate and inside a QR code somebody has already laminated. The page behind it explains what the channel is, what it asks a phone for, and how to subscribe — so a stranger reading a poster can decide before installing anything. We generate the QR code for you, server-side, and it is never sent to a third-party image service.
Questions, answered plainly
Can somebody find my private channel by guessing the name?
No. A sealed channel answers a request without an invite code with exactly the same “not found” that a nonexistent handle gets. There is no response that distinguishes “this exists but you may not see it” from “this does not exist”, because that difference is itself a leak.
Can I change my handle later?
No, and that is on purpose. It gets printed on posters and encoded into QR codes, and a handle that could change is a handle that turns somebody’s laminated sign into a dead link. Choose it the way you would choose a street name.
Do subscribers need an account?
No. They install the app, subscribe to a handle, and that is the whole of it. Only the person running the channel signs up for anything.
How do people find my channel?
From the handle you give them: on a poster, in an enrolment email, on a QR code, in a footer. Public channels also appear in the app’s discover list. Sealed ones appear nowhere at all, by design.
Say it once. Every subscribed phone gets it.
Free up to 100 subscribers, no card to start, and the handle is yours permanently.
Start a channel