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 and Claude Desktop 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)”
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?'”
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 and Slack 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?
Link your number in Settings, Integrations. Send receipt photos, voice notes or questions in plain English. Finn files and answers in seconds, and messages you first when something needs you. Filings are approved in the app, never from a chat.
Will Finn message me first?
Yes. On WhatsApp, Telegram and Slack, Finn sends a short note when something needs a decision. On WhatsApp, outside the 24 hour window, it arrives as an approved notice asking you to reply.
How does Slack integration work?
Install the AccountsOS app in your Slack workspace from Settings → Integrations. DM the bot to chat with your books, upload documents, or ask questions about deadlines and balances.
How does Telegram integration work?
Connect Telegram in Settings → Integrations and message the AccountsOS bot. Send receipt photos, record a voice note to log an expense, or ask about balances and deadlines. Bot commands cover the quick actions.
Does AccountsOS connect to Gmail?
Yes. Connect your Google account in Settings → Integrations and AccountsOS scans your inbox for receipts and invoices, capturing the attachments automatically. You can also import transactions from Google Sheets. Nothing needs forwarding by hand.
Is Microsoft Teams integration available?
Microsoft Teams integration is coming soon. Email the team if you'd like to be notified when it launches. Email, Gmail, WhatsApp, Slack, Telegram and Claude Desktop are available today.
Will my data be secure?
Absolutely. All messages are encrypted in transit and at rest. We never store your conversations longer than needed for processing, and your financial data is protected with bank-grade security.
Can I use voice messages?
Yes! Send voice notes via WhatsApp or Telegram and our AI will transcribe and process them. Perfect for logging expenses while driving or when you can't type.
How do I get access to messaging integrations?
Messaging integrations are included with AccountsOS. Sign up for an account and connect WhatsApp, Telegram, Slack, Gmail or Claude Desktop from Settings → Integrations. Email forwarding works from day one with no setup.
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.
Free for 14 days · No credit card required