Midday is an open-source business operations platform designed specifically for freelancers, consultants, and solo entrepreneurs who need to manage invoices, track billable hours, reconcile receipts, and export clean financial data—all in one place. It eliminates the fragmentation of tools like QuickBooks, Toggl, and Dropbox by unifying financial workflows with AI-powered automation.
Built as a monorepo with Next.js, Supabase, and TypeScript, Midday integrates with Plaid, GoCardless, and Teller for bank syncing, uses Gemini and OpenAI for transaction categorization and insights, and deploys via Vercel, Railway, and Cloudflare. Its architecture supports real-time collaboration, secure file storage, and automated background jobs via Trigger.dev.
What You Get
- Time Tracking - Live tracking of project hours with automatic categorization and project overviews to measure productivity and billable time.
- Invoicing - Create web-based invoices that customers can pay online, with automatic payment tracking and status updates.
- Magic Inbox - Automatically matches incoming PDF receipts and invoices to corresponding transactions using AI-powered document parsing and pattern recognition.
- Vault - Secure, centralized file storage for contracts, receipts, and agreements with access control and search functionality.
- Seamless Export - Export all financial data as clean, accountant-ready CSV files with categorized transactions and invoice records.
- Assistant - AI-powered insights that analyze spending patterns, suggest cost cuts, and help locate documents using natural language queries.
Common Use Cases
- Running a freelance design business - A graphic designer uses Midday to track hours spent on client projects, send invoices with online payment links, and auto-match receipt PDFs from Adobe and Figma to expenses.
- Managing a solo consulting practice - A business consultant connects their bank accounts via Plaid to auto-sync income and expenses, then uses the Assistant to identify overspending on software subscriptions.
- Preparing for tax season - A freelance developer exports all transactions and receipts as CSV files to hand off to their accountant without manual data entry or spreadsheet chaos.
- Tracking SaaS expenses across tools - A solopreneur automatically reconciles monthly charges from Vercel, GitHub, Notion, and OpenAI using the Magic Inbox to avoid missed deductions.
Under The Hood
Architecture
- Monorepo structure with Turbo orchestrating coordinated builds across API, dashboard, and website workspaces, enforcing clear separation of concerns
- Hono-based API layer decoupled from business logic via service classes and dependency injection, enabling pluggable bank integrations
- Domain-driven design with dedicated modules for Customer, Invoice, and Transaction entities, using DTOs to enforce type-safe data boundaries
- Clean separation of UI and backend via type-safe client hooks and API contracts, with React components isolated from data layer concerns
Tech Stack
- TypeScript monorepo leveraging Next.js for web apps and Hono for APIs, with React 19.2.4 as the core UI framework
- Multi-package management via Bun with hoisted dependencies and version pinning for reproducibility
- PostgreSQL with pgvector extension for vectorized financial data, orchestrated in Docker Compose for test environments
- AI integrations via SDKs for OpenAI and Google models, paired with BullMQ for job queuing and Pino for structured logging
- Environment management through .env files, Sentry for error monitoring, and Biome for consistent linting and formatting
Code Quality
- Extensive test coverage spanning unit, integration, and domain-specific logic with snapshot testing for complex transformations
- Clear modular layers using tRPC, MCP routers, and DB queries, with robust mocking and test contexts to isolate dependencies
- Consistent error handling with descriptive messages and structured validation instead of generic exceptions
- Strong type safety enforced through Zod schemas, TypeScript interfaces, and explicit type assertions in tests
- Uniform naming conventions and mirrored test structures that enhance readability and maintainability across teams
What Makes It Unique
- Multi-region Redis architecture with Upstash and Railway-hosted queues enables global scalability without sacrificing job reliability
- Dynamic Open Graph image generation via Next.js Edge Runtime with embedded fonts creates branded social previews without external services
- Real-time inbox with virtualized rendering and timeout-based empty states delivers native-like responsiveness despite asynchronous data
- Unified bank connection UI abstracts multiple providers into a single composable component with shared state and usage tracking
- AI-powered comparison OG images render static, shareable content that embeds product differentiation directly into social media
- Granular cache invalidation with replication-aware TTLs ensures consistency across regions while gracefully degrading during outages