Midday — Open-Source Financial Tools for Freelancers

Introduction

Midday is an open-source platform that consolidates invoicing, time tracking, file reconciliation, and financial overview into a single application. It targets freelancers and small businesses who want full ownership of their financial data without relying on proprietary SaaS tools.

What Midday Does

• Generates and sends professional invoices with customizable templates
• Tracks billable time per project with a built-in timer
• Reconciles bank transactions by matching them with invoices and expenses
• Provides a financial dashboard with income, expenses, and profit overview
• Stores receipts and financial documents with automatic categorization

Architecture Overview

Midday is built as a monorepo using Turborepo, with a Next.js frontend deployed on Vercel and Supabase as the backend (PostgreSQL database, auth, and storage). It uses Plaid or similar integrations for bank connections and Resend for transactional email delivery.

Self-Hosting & Configuration

• Clone the monorepo and install dependencies with pnpm
• Set up a Supabase project for database, auth, and file storage
• Configure environment variables for bank integration API keys
• Deploy the Next.js app to any Node.js hosting or Vercel
• Set up webhook endpoints for real-time bank transaction syncing

Key Features

• AI-powered transaction categorization and expense matching
• Multi-currency support for international freelancers
• Team collaboration with shared project and client views
• Export to common accounting formats (CSV, PDF reports)
• End-to-end type safety with TypeScript across the entire stack

Comparison with Similar Tools

• Wave — Free invoicing but proprietary and limited customization
• FreshBooks — Full-featured but expensive and closed-source
• Invoice Ninja — Open-source invoicing but less integrated time tracking
• Harpoon — Freelancer financial planning but proprietary
• Akaunting — Open-source accounting but heavier and PHP-based

FAQ

Q: Can Midday connect to my bank account? A: Yes, it integrates with banking APIs to automatically import and reconcile transactions.

Q: Is Midday suitable for teams or only solo freelancers? A: It supports team collaboration with shared projects, though it is primarily designed for freelancers and small teams.

Q: What database does Midday use? A: PostgreSQL via Supabase, which also handles authentication and file storage.

Q: Can I self-host Midday completely? A: Yes. You can run Supabase locally and deploy the Next.js app on your own infrastructure for full data ownership.

Sources

• https://github.com/midday-ai/midday
• https://midday.ai