A fresh take on allowance
You are your children's bank. Teach them that money isn't free, but a reward for work and patience.
Mary
12% annual rate
€89.52
+€0.03
John
21% annual rate
€247.83
+€0.14
How it works
Four steps. That simple.
Create an account
Create a savings account for your child and set the interest rate. The interest is the allowance.
Record transactions
Track deposits and expenses — birthday money, chores, spending, etc.
Interest is calculated
Every day, interest is automatically calculated on their balance. That's how allowance is earned.
Insight into their money
Kids track their balance and learn why patience pays off.
Features
Everything you need. No fluff.
Custom interest rates
Set any rate you want — from realistic to generous. You control how fast their savings grow.
Daily compounding
Interest compounds every single day. Kids see real growth and learn why patience pays off.
Kid-friendly view
A simple, shareable page designed for young savers. Kids check their balance anytime.
Transaction history
Every deposit, withdrawal, and interest payment — tracked and fully transparent.
Multiple accounts
One account per child, or multiple — whatever works for your family.
Privacy-first
Your data stays yours. No tracking, no ads, no selling.
Try it yourself
Discover Knap with a demo account. No strings attached. Data resets every 2 hours.
Start the demoPricing
Pay once. No subscription.
- Multiple savings accounts
- Interest calculated automatically daily
- Kid-friendly sharing view
- Full transaction history
No subscriptions. No hidden fees. Pay once.
FAQ
Got questions?
Knap is a savings app for parents who want to teach their kids about money. You create virtual savings accounts, set interest rates, and manage their transactions.
You set a custom interest rate for each account. Interest is calculated daily on the balance. Instead of weekly allowance, they earn it through interest.
Yes and no. The balances represent real allowance money you've committed to your child. Think of it like a digital piggy bank where you're the bank — you set the rates and manage the transactions.
Any age! Younger kids love watching the numbers grow. Older kids start to understand compound interest and saving strategies. We've seen it work with kids as young as 4.
Yes! Each account has a kid-friendly shareable view. Kids view their balance and transactions on their own page — on phone, tablet, or computer. Read-only, no login needed.
Yes! Try the demo.
Your data is stored securely and privately. We don't track you, show ads, or sell data.
Yes! Each child gets their own account with its own interest rate and balance. You pay per family, not per account.
If you're not happy, email us within 30 days for a full refund. No questions asked.
Many kids get allowance and spend it right away. They don't see that their parents worked for it. Free money — no effort or patience required. That's not how the real world works. I wondered: how do I teach my own kids that money is a reward for work and patience?
On social media I came across someone with a simple solution. Interest as allowance. Using Apple Numbers I created a spreadsheet in 2022 for my two boys — then 4 and 6. I made an overview of their savings with a little interest each day, and put a read-only version on their iPads.
Friends saw it and wanted the same. But sharing a spreadsheet turned out to be too complicated. In early 2024 I rebuilt it as a web app — simpler, clearer, and accessible to everyone.
Two years later, Knap is still actively used within my family. And now available for everyone.
Mark van Duijker
Founder of Knap
Become your children's bank today.
Discover together with your kids how money works. Teach them to save for the things they really want.