AI Expense Tracker
Turning everyday chat messages into organized financial records. Slack-based expense tracking with natural language input in Greek and English.
The Challenge
Small business owners and busy professionals often struggle with expense tracking. The traditional approach — saving receipts, opening spreadsheet apps, manually categorizing each purchase — creates friction that leads to incomplete records and missed deductions.
Our client needed a solution that would:
- Eliminate manual data entry for daily expenses
- Support Greek and English input seamlessly
- Work within existing workflows (no new apps to learn)
- Automatically categorize expenses across 14+ categories
- Generate monthly reports without any additional effort
- Handle receipt photos alongside text entries
The goal was simple: make expense logging as easy as sending a chat message.
The Solution
We built an intelligent expense tracking system that integrates directly with Slack. Users simply type their expenses in natural language — the AI handles everything else.
How It Works
πρωινό και καφέδες 11 (breakfast and coffee 11) - Amount: €11.00
- Category: Food
- Title: πρωινό και καφέδες
- Date: Auto-captured
Built with:
Key Features
Natural Language Input
No forms, no dropdowns. Just type like you're texting a friend: "καφές 3.50" or "βενζίνη 45€"
Multi-line Support
Log multiple expenses in one message. Each line becomes a separate record with unique tracking IDs.
Edit Support
Changed your mind? Edit the Slack message. The system detects modifications and updates records automatically.
Receipt Photos
Upload receipt images. GPT Vision extracts merchant name, amount, date, and payment method.
14+ Categories
Automatic categorization across house expenses, food, transportation, health, business, gifts, and more.
Monthly Reports
Automated HTML email reports with summaries, category breakdowns, and detailed expense lists.
Results
I just type 'καφές 3' and forget about it. At the end of the month, everything is there, organized, and ready for my accountant.
Technical Highlights
- Concurrency protection: Lock file mechanism prevents duplicate processing
- Bot filtering: System ignores its own messages to prevent loops
- Error handling: Dedicated error workflow with Slack notifications
- Full audit trail: Soft-delete functionality maintains complete history
- Bilingual support: Processes Greek and English with equal accuracy
Want Similar Automation?
Let's discuss how we can build a custom solution that fits your workflow.