Your accountant, in your pocket
Run your books from WhatsApp, or your inbox
Snap a receipt, send a voice note, ask what's outstanding. Finn keeps the books in the background and messages you first when something needs you. Telegram, Slack and Claude Desktop are there too.
WhatsApp, email, Gmail, Telegram, Slack, Claude Desktop and phone calls are live now
Finn from AccountsOS
Business account
Logged 42 miles to the Reading client at 55p, £23.10. That's 312 miles this month.
Your Favourite Apps, Now With Accounting Superpowers
The app you already have open. Finn files what you send and messages you first.
- Snap and send receipts instantly
- Forward invoices from your phone
- Ask questions in plain English
- Get expense reminders
- Voice notes for hands-free logging
- Finn messages you first when something needs you
Examples:
- “Snap a coffee receipt at the cafe”
- “Forward an invoice while commuting”
- “Ask "Can I claim this dinner?" at the restaurant”
- “Log mileage while driving (voice)”
Phone
Call Finn from any phone. Key in your PIN and talk to your books, hands-free.
- Dial +44 7700 163900 from any phone
- A six-digit PIN proves it's you
- Ask what's in the bank, what's due, who owes you
- Say yes to a draft invoice or an expense and Finn does it
- Call notes land on your WhatsApp afterwards
Examples:
- “Check the bank balance from the van”
- “Ask about a VAT deadline between site visits”
- “Draft an invoice on the drive home”
- “No account yet? Call anyway and Finn shows you round”
Already live. Forward documents and they're processed automatically.
- Forward invoices and receipts
- AI extracts supplier, amount, date, VAT
- Auto-categorised to your books
- Works with any email client
Examples:
- “Forward a supplier invoice from your inbox”
Gmail
Connect your inbox once. Finn finds the receipts you forgot to forward.
- Auto-scans your inbox for receipts
- Captures invoice attachments
- Imports transactions from Google Sheets
- Nothing to forward manually
Examples:
- “Let a subscription receipt file itself”
- “Pull last month's invoices out of your inbox”
Telegram
Fast, private, and always in your pocket. Message Finn like anyone else.
- Send receipt photos straight from your camera
- Voice messages transcribed and logged
- Ask about balances and deadlines
- Bot commands for quick actions
Examples:
- “Send a receipt photo the moment you pay”
- “Ask "What's my cash position?" on the move”
- “Log an expense by voice note”
Slack
Your AI accountant joins your workspace. Ask anything, anytime.
- Direct message your AI accountant
- Upload documents from any device
- Get instant answers to tax questions
- Deadline notifications in Slack
- Quick expense categorisation
Examples:
- “Ask "What's my VAT bill this quarter?"”
- “Upload a supplier invoice from desktop”
- “Check "When's my CT deadline?"”
- “Get notified of upcoming filings”
Claude Desktop
Live now. Chat with your books directly from Claude Desktop via MCP.
- Query your accounts from Claude Desktop
- Ask tax questions naturally
- Create transactions via chat
- Get balance and deadline info instantly
Examples:
- “Ask Claude 'What's my VAT liability this quarter?'”
Apple Messages
Coming soon. Finn in the Messages app on iPhone, iPad and Mac, waiting on Apple's approval.
- Receipt photos and PDFs, filed and matched
- Voice notes in, voice notes back
- Finn messages you first when something needs you
- A person on the team, one message away
Examples:
- “Send a receipt from the Messages app you already have open”
- “Ask "what's outstanding?" from your Mac”
- “Hand the thread to a person when you want one”
Microsoft Teams
Coming soon. For businesses on Microsoft 365.
- Chat with your AI accountant in Teams
- Share documents from OneDrive
- Get deadline alerts in your channels
- Ask tax questions without leaving work
- Team-wide expense notifications
Examples:
- “Ask "How much have we spent on travel this quarter?"”
- “Upload invoices from SharePoint”
- “Get reminded about upcoming VAT deadlines”
- “Check company expense totals in a team channel”
How It Works
Connect Your Account
Link WhatsApp in Settings, or connect Gmail. Telegram, Slack and a number to call are there too.
Message Anytime
Send photos, documents, or questions in plain English
AI Does the Work
Data extracted, categorised, and added to your books
Why Message Your Books?
Always available
Your AI accountant never sleeps
Ask questions at 2am or 2pm
Your AI accountant never sleeps
LiveInstant Processing
Receipts and invoices processed
In seconds, not days
Receipts and invoices processed
LiveVoice support
Voice notes in, voice notes back, on WhatsApp and Telegram
Log expenses hands-free while driving
Voice notes in, voice notes back, on WhatsApp and Telegram
LiveFinn comes to you
Nudges land on WhatsApp
A return ready, an invoice overdue, a deadline near
Nudges land on WhatsApp
LiveSecure & private
End-to-end encryption
Your data stays your data
End-to-end encryption
LiveFrequently Asked Questions
How does WhatsApp integration work?
Will Finn message me first?
How does Slack integration work?
How does Telegram integration work?
Does AccountsOS connect to Gmail?
Is Microsoft Teams integration available?
Is Finn on Apple Messages?
Will my data be secure?
Can I use voice messages?
Can I call Finn?
How do I get access to messaging integrations?
Accounting That Fits Your Life
You're busy running a business. You shouldn't have to stop and log into another app.
Use apps you already know
Do accounting where you already work
Your AI accountant never sleeps
The best accounting software is the one you actually use. We're building AccountsOS to meet you where you are.
Start Messaging Your Books Today
Sign up for AccountsOS and connect WhatsApp, Telegram, Slack or Gmail from your settings in minutes, or switch on calls and ring Finn.
Free for 14 days · No credit card required