Books that keep themselves right. VAT on every bill, every deadline on one page.
Tell Karr what happened in plain words. It writes the entry, puts VAT on every bill, and your accountant works in the same books.
Make it yours
Kept in this browser. Sent nowhere.
Where is your business?
Your next 90 days
- Monthly payroll RTI to HMRC (PAYE/RTI Submission), Sep 2026
- Quarterly VAT return to HMRC (VAT Return), Q2
- Monthly payroll RTI to HMRC (PAYE/RTI Submission), Oct 2026
- Monthly payroll RTI to HMRC (PAYE/RTI Submission), Nov 2026
These are the standard dates for a business like yours in United Kingdom. Karr works out your exact dates once it knows your registrations.
Chapter 1
Tell Karr what happened
Say it in plain words. Karr writes the entry, checks it and files it in the right place.
- 1
Open Karr on your phone and the money is the first thing you see: in the bank, owed to you, owed by you.
- 2
A bill goes to the customer from your own WhatsApp, from the same screen.
- 3
And Karr tells you, on the phone, the moment something needs you.
Chapter 2
Selling and getting paid
Quotes, orders, invoices and the money that comes back.
Chapter 3
Buying and paying
Bills in, payments out, and nothing paid twice.
Chapter 4
Bank and cash
Every payment in and out, matched to the bank.
Chapter 5
Tax, on time
Returns built from your books, deadlines watched for you.
- 1
Every bill carries your country's VAT, at the right rate, worked out line by line.
- 2
Karr adds it up as you go, so you always know what you will owe.
- 3
And every date you must file by sits on one calendar, worked out for your business.
Chapter 6
Stock and making
What you hold, what you make, and what it cost.
Chapter 7
Your people
Salaries, leave and claims, and the papers that go with them.
Chapter 8
Your numbers
Reports you can trust, because every figure leads back to an entry.
Chapter 9
Year end and audit
Close the year, sign the statements, hand the auditor everything.
Chapter 10
Built for your trade
Restaurants, labs, trusts and online sellers get screens of their own.
Chapter 11
The agents
Named helpers who do the routine work, on your own AI key.
Chapter 12
Moving in and setting up
Bring your books in, tell Karr about your business once, and invite your team.
Everything, at a glance
Counted from the same list the app is checked against, so a new screen shows up here the day it ships.
- things Karr does for a business here
- 88things Karr does for a business here
- changes shipped in the last 90 days
- 144changes shipped in the last 90 days
- kinds of link a client opens with no login
- 7kinds of link a client opens with no login
- countries Karr keeps books for
- 30countries Karr keeps books for
New in Karr
New this month
Verified books
A robot accountant checks your books every night.
Karr runs a battery of double-entry invariants across your ledger nightly — the same checks a senior accountant would, automated. You wake up to a score and a plain-language report, and can hand a lender a signed certificate of self-verified books.
An automated consistency check — not a statutory audit.
Books verified last night
Score 100 / 100 — all checks passed
- ✓Every entry balances
- ✓Trial balance foots to zero
- ✓Balance sheet foots
- ✓Receivables tie to customers
- ✓Payables tie to vendors
- ✓Inventory ties to the GL
- ✓No orphan payment allocations
Common questions
Every new business gets 30 days of Karr free. Signing up asks for no card and no payment. Your price shows in the app before you pay.
No. You tell Karr what happened in plain words, one question at a time, and it writes the entry.
Only if you want it to. AI in Karr runs on your own key from Gemini, Claude or OpenAI, added once in Settings. Karr never runs AI on a key of its own.
Each business is kept apart in the database by row-level security, so no other business can read its books. Your data is encrypted at rest by our database host. Every change to invoices, journals and payroll is written to an audit trail that members can read and nobody can edit. We do not sell your data.
VAT goes on every bill at United Kingdom's rates, with your VAT Number. Your filing dates are listed on one page. Karr does not file returns in United Kingdom yet.
Yes. Customers, items and opening balances come in from a spreadsheet, and a whole ledger can come in from Tally.
Yes. Invite your accountant with the role you choose, and they work in your books from their own login.
Sending email from your own address
Karr sends the paperwork your business already sends: invoices to customers, payment reminders when a bill goes overdue, and compliance notices to your accountant. Those should come from you, not from a software company's address — so Karr lets you connect your own mailbox and sends through it.
If you use Gmail or Google Workspace, you can connect it in one click. Karr asks Google for permission to send mail on your behalf, and for your email address and name so it can show you which mailbox is connected.
Karr cannot read your email. It cannot open, search, download, forward, change or delete a single message — the permission it holds only allows sending, and no other access is requested or possible. Your messages are never stored on Karr's servers.
You can disconnect at any time from Settings → Email, which deletes the stored credential immediately. Mail providers outside Google are supported through standard SMTP, so connecting Google is always optional. Full detail is in our Privacy Policy.