Midday is an open-source, all-in-one business assistant designed specifically for freelancers, contractors, and solo entrepreneurs who need to manage invoicing, time tracking, file storage, and financial reconciliation without juggling multiple tools. Built with TypeScript, Next.js, and Supabase, it unifies scattered workflows into a single interface, reducing administrative overhead and improving financial clarity. The platform leverages AI to automate tasks like matching receipts to transactions and providing spending insights, making it ideal for individuals who want to focus on their work rather than bookkeeping.
While Midday offers a hosted service at midday.ai, its open-source nature allows technically inclined users to self-host the full stack on their infrastructure using Supabase for backend services and Vercel for frontend deployment. The AGPL-3.0 license permits non-commercial use, while commercial deployments require a separate license.
What You Get
- Time Tracking - Live time tracking for projects with real-time project overviews to monitor productivity and bill clients accurately.
- Invoicing - Web-based invoice creation with real-time collaboration features and seamless project synchronization (currently in development).
- Magic Inbox - Automatically matches incoming invoices and receipts to corresponding transactions, reducing manual data entry and improving financial accuracy.
- Vault - Secure file storage for contracts, agreements, and important documents with centralized access and search capabilities.
- Seamless Export - Export financial data as CSV files for easy sharing with accountants or tax professionals.
- Assistant - AI-powered insights that analyze spending patterns, suggest cost-cutting opportunities, and help locate documents within the Vault.
Common Use Cases
- Building a freelance consultancy business - A solo consultant tracks billable hours across multiple clients, uploads signed contracts to Vault, and uses Magic Inbox to auto-categorize receipts for tax season.
- Managing a multi-client freelance workflow - A graphic designer uses Time Tracking to log hours per project, generates invoices directly from tracked time, and exports monthly financial summaries to their accountant via CSV.
- Problem: Disorganized finances → Solution with Midday - Freelancers struggle to reconcile bank statements, lost receipts, and unpaid invoices. Midday’s Magic Inbox and Vault eliminate this chaos by auto-matching documents and centralizing storage.
- Team/workflow scenario: Solopreneurs with complex tax needs - A US-based freelancer connects Plaid or Teller for bank feeds, uses the Assistant to identify tax-deductible expenses, and exports reports for their CPA—all without switching apps.
Under The Hood
Midday AI is a modular, AI-powered financial analysis platform built with TypeScript and modern web technologies. It integrates seamlessly across API, dashboard, engine, and desktop applications to automate complex financial insights through agent-based reasoning and artifact generation.
Architecture
The system adopts a monorepo structure with distinct domains and clear separation of concerns. It applies design patterns such as strategy and factory patterns to support extensibility and maintainability.
- Modular architecture with dedicated modules for API, dashboard, engine, and desktop
- Strategy and factory patterns used for provider implementations and canvas rendering
- Clear domain boundaries and separation between UI, API, and backend services
- Supports extensible data sources and provider integrations
Tech Stack
The project leverages TypeScript and contemporary JavaScript frameworks to build a scalable, cloud-native system with AI integration.
- Built with TypeScript, React, Next.js, and Hono for full-stack development
- Integrates AI SDKs from ai-sdk-tools and various Midday-specific packages like @midday/db and @midday/engine
- Uses Bun, Vite, and Turborepo for runtime, build, and monorepo management
- Employs Sentry for error tracking and Biome for linting and formatting
Code Quality
The codebase emphasizes testing and consistent error handling, though some over-engineering is evident in test utility usage.
- Comprehensive test factories and helper utilities support extensive unit and integration testing
- Error handling follows consistent try/catch patterns across modules
- Code maintains reasonable naming conventions and structural consistency
- Reliance on test helpers suggests potential for over-engineering in test setup
What Makes It Unique
Midday AI stands out by combining AI-driven financial analysis with a highly extensible architecture and agent-based automation.
- Seamlessly integrates AI-powered insights with diverse banking and accounting data sources
- Implements agent-based reasoning to automate complex financial artifact generation
- Offers modular extensibility that supports varied provider and data integration patterns
- Combines artifact generation with reasoning to deliver actionable financial intelligence