01
Create a wire
A purpose, an expiry rule — ten seconds. The purpose matters more than the code: it is what appears in large type when your phone rings.
For iPhone and Android
Be reachable.
Without handing out your number.
Supsy gives you a link instead of a phone number. You decide how long it lives — after the call, on a date, or until you burn it.
- Ten characters instead of eleven digits
- Expires when you say so — or never
- The other side needs no app
Wires
Bike listing
supsy.to/k7m4x2qp9v
4 days left2 calls
Bathroom builder
supsy.to/bad-2026
Permanent9 calls
Sofa pickup
supsy.to/t3wq8mzf5r
Ends after the call0 calls
How it works
One wire. One purpose. One ending.
You hand out a phone number once and never get it back. A wire is the opposite: when you create it, you already know when it stops.
02
Share the link
As a short link in the listing, as a QR code behind the windscreen wiper. Every wire has both, and neither is the poor cousin.
03
It runs out
After the call, on the date, after fourteen quiet days — or you burn it. From then on the link leads nowhere, and you never have to tell anyone.
Expiry rules
You decide when it ends.
Every wire gets a rule when you create it. It is checked on every call — not once a day, but in the moment someone opens the link.
Expired codes stay taken for as long as your account exists. That costs us storage and you nothing — but it makes sure an identifier never passes to another person and an old link never rings at a stranger's.
Features
Everything a call without a number needs.
No feed, no contact list, no status. Supsy does exactly one thing — and does it properly.
Screening question
Before your phone rings, the caller types a name and what it is about. You don't see an unknown number, you see the reason — and decide from there.
Voice message
Unavailable, or simply not in the mood? The other side records — right in the browser, no app. After thirty days the server deletes the recording.
QR and short link
Every wire has both. One for the windscreen, one for the listing. Ten characters, with no easily confused digits.
Burn, with a replacement
One tap and the link is dead. If you want, a new one with the same settings appears immediately — which is why you dare to tap at all.
Known callers
Whoever has called before shows up in a list. Remembered means: gets through without the question. Blocked means: reaches you through no wire at all — and never notices.
Availability window
Nine to six. Outside those hours it goes straight to the voice message, without anyone seeing whether you felt like it or not.
What people lay wires for
Whenever „call me“ shouldn't mean „here is my number“.
In the app the purpose sits above the code — because it is what you read when the phone rings.
Bike listing
supsy.to/k7m4x2qp9v
The listing runs for a week. So does the wire. After that nobody calls about a bike that sold long ago.
Blocked-in car
supsy.to/p9nc4vk21x
A note behind the wiper with a QR code. Whoever is blocked in calls — and your number isn't stuck to the street.
Flat viewing
supsy.to/t3wq8mzf5r
Thirty applicants, one link in the ad. Expired after the call — the other twenty-nine never reach you.
First date
supsy.to/w4qm7zt3ky
Talk before you meet. Without your number sitting in the chat history of an app you'll delete tomorrow.
Bathroom builder
supsy.to/bad-2026
Permanent, because he may call at any hour for weeks. And still without your number — for when the building site is history.
Marketplace pickup
supsy.to/z8hq2vnk4m
„First caller only“: whoever gets through first gets the wire. For everyone after them it is already dead.
Privacy
What Supsy doesn't know, Supsy can't lose.
This isn't a setting you can flip, it is how the thing is built. There simply is no field for a phone number.
No phone number
Neither yours nor the caller's. An email address is enough to sign in — and with „Sign in with Apple“ you can hide even that.
Device to device
The audio runs directly between the phones. Our server sees that a connection is made, never what is said.
No address book
Supsy doesn't ask for your contacts. There is nothing to upload and nothing to match.
No tracking
No analytics cookies, no advertising identifier, no third-party fonts. This site loads every file from its own server.
Plans
Free is not bait.
Calling, being called, burning, sharing — all of it is free and stays free. Supsy Plus lifts exactly three limits, nothing else.
SupsyFree
The full feature set, with three limits. No trial that runs out, and no feature that disappears after a week.
- 2 simultaneously active wires
- Voice messages up to 60 seconds
- 14 days of retention for history and messages
- Calling and being called without limit
- Burning, blocking, QR code, link by email
Supsy PlusMonthly or yearly
The same app, the same rules — just without the three limits. The app shows you the price before you buy, in your currency and with your tax.
- Any number of simultaneously active wires
- Voice messages up to 10 minutes
- Retention freely chosen: 7 days to never expiring
- Shorter than free, too — if you want to forget faster, you can
- Cancel any time in the store
When your subscription ends we delete not a single wire. Existing ones keep working; only creating new ones is blocked. Messages already there stay. And retention only falls back to 14 days after another 30 days — time enough to download your data without hurrying.
FAQ
Answered briefly.
Do I need a phone number?
No. Supsy has no field for one. An email address is enough to sign in, and with „Sign in with Apple“ you can hide even that — then we don't know it either.
Does the other person need the app?
No, and that is the whole point. They open the link in a browser, type a name and their concern, and call. A link works on any device, with no install and no account.
What happens when a wire expires?
The link leads nowhere — with exactly the same answer as a code that never existed. From the outside you cannot tell whether a wire expired, was burned, or was invented. Otherwise the number space could be searched.
Can a code be reused?
Never. Expired and burned codes stay taken for as long as your account exists, so an identifier never passes to another person and an old link never rings at a stranger's. If you delete your account, everything goes with it, codes included; with around 590 trillion possibilities, any one of them ever being drawn again is practically impossible.
Can I get rid of someone?
Twice over. Burning kills the single link immediately. Blocking goes further: that caller reaches you through none of your wires any more — and gets the same answer as for an expired code, so they never notice.
Can I reach emergency services?
No. Supsy is not a telephone service and has no connection to the phone network. For emergencies always use your regular phone and the relevant emergency number.
What does Supsy cost?
Nothing, as long as two wires are enough for you. Free are: two simultaneously active wires, voice messages up to 60 seconds, and 14 days of retention. Calling, being called, burning and sharing are included without limit. Supsy Plus lifts exactly those three limits — any number of wires, messages up to 10 minutes, and a retention period you choose yourself, from 7 days to never expiring. As a monthly or annual subscription; the app shows you the price before you buy. What is free stays free.
Where are the servers?
In a data centre in Germany. We run the entire stack behind it ourselves — there is no big cloud provider reading along.
Your first wire takes ten seconds.
Free to download. No phone number to start.
iPhone and Android · No ads · No phone number