Kithe — the quiet way to stay in touch.
The address book that keeps itself up to date — without becoming another social network.
Free forever. Nothing of yours is ever stored on our servers.
read on02 · The problem
Your contacts are already out of date.
Phone numbers, social handles, email addresses, where someone works or lives — the tangible details change constantly.
People switch numbers, leave a platform, move on. What you saved years ago quietly goes wrong, and you only find out when a message bounces.
So to actually stay reachable, everyone drifts to social media — and pays for it: your life becomes a feed, staying in touch turns into posting and scrolling, and you're watched by people and companies you never chose.
Today you get two options — an address book that's private but dead, or social media that's current but public. Both cost you something.
03 · What it is
A living address book.
You make a card. You share it in person, and you decide — for each person — exactly what they see.
When your details change, everyone you've shared with updates on their own.
No posting. No feed. No followers.
Kithe is an address book, not a secret vault.
Its job is to keep your details current and in your control — not to hide them from the people you chose to share with.
It stays current like social media, and private like a notebook in your drawer.
- Why not just save their number?
- It's wrong the moment they change it.
- Why not just follow them?
- Staying in touch shouldn't mean broadcasting your life — or being tracked for it.
- Why Kithe?
- It updates itself, privately, and shows each person only what you chose.
Not a social network. Not a networking tool. Not something to check.
04 · The principle
What you share is still yours.
Give someone your phone number, your handle, your email — they have it, but it's still yours.
That never stops being true, and Kithe is built entirely on that one idea.
Think of the card someone holds of you as an embassy: it sits on their phone, but it's your ground. They can visit the relationship; they can't walk in and take what's inside — and you can update it, or quietly close it, any time.
It stays yours after you share it.
You can change it after the fact.
No company ever needs to hold it.
05 · How it works
How it works.
No account. Nothing of yours on our servers.
There's no profile and no password — just a one-time phone check, so the people you connect with can actually reach you.
Nothing about you is stored on our side. Your card lives on your phone and in the cloud you already use — your iCloud or Google Drive, not ours.
When you change something, the update travels to your people in a sealed envelope only their phone can open.
It passes through a small relay that reads the address and nothing else — a courier who delivers the letter without ever opening it.
There's no Kithe account holding your life, because there was never a copy to hold.
06 · Honest limits
What it honestly can't do.
Kithe keeps your details from being stored, sold, or read by anyone you didn't choose.
What it can't do is stop someone screenshotting something you shared with them — no app can, and we won't pretend otherwise.
It's a notebook you control, not a vault that beats a camera.
Saying so plainly is part of earning your trust.
07 · The maker
Made by one person.
Free, always.
Kithe is built by one person, design-first, and it isn't a business — no ads, no investors, nothing to sell, because you are not the product.
Free forever, non-profit, and open source, so anyone can check it does exactly what it says.
08 · Kithe