Expense sharing.
For families & friends.

For complex or simple families, and friends. Everyone you split with sees only what they share with you — never each other.

Coming soon on theApp Store

Free, with no ads. Want in sooner? hello@kith4.app

Kith4 home screen: you are owed €696.40 across four people — Elena, Chris, Tom and Mum — with recent expenses below.

What it does

One app for all of it.

Your partner, your ex, your family, your friends — every shared expense in one place, each relationship kept apart.

Add Expense: Pizza night, €38.50, split 50/50 with Elena. — **Add an expense**Amount, who paid, how it splits. Save the split you always use.

People: your balance with Elena, Chris, Tom and Mum. — **Your balance with everyone**Who owes you, who you owe. They don’t even need the app.

Ledger: Elena edited Electricity from €128.00 to €131.60; Chris removed Parking. — **Every change recorded**Edits and deletions, by whom and when. Nothing changes quietly.

Groceries: €86.40 split with Elena, with a note and its history. — **Notes on every expense**Keep the details: which shop, what it included.

Search for Mia: football boots and school trip. — **Search**By what it was, how much, or who was in it.

Private by design

Everyone sees only their part.

Share an expense with one person or with everyone. Each person sees only the expenses they created or were added to — never anyone else’s.

No groups

Add a contact and start sharing. Made for relationships that last years — not for one trip.

Only what you’re part of

You see the expenses you created and the ones you were added to. Nothing else, from anyone.

No one knows who else

Your partner never sees your ex. Your ex never sees your partner. Neither can tell the other is there.

Free. No ads — for now.

Ad-free. And your data is never sold.

Kith4 is free and has no adverts — today, and hopefully for good. Your data is never sold, and never used to follow you around other apps.

Running it isn’t free — servers, email and the App Store all cost money. So at some point Kith4 will need to charge, or show adverts. When that happens, you’ll hear it here first, and plainly.

Made by a blended family

We built it because we needed it.

Kith4 started with one family whose expenses split several ways at once, and an app store full of tools that assumed everyone belongs to one group. If that sounds like your house, it was made for you.