Ledgerline

Ledgerline is a local-first personal finance pipeline designed for seamless and secure management of financial data. By utilizing SQLite, it provides users with an intuitive ledger interface for tracking expenditures, analyzing bank exports, detecting recurring payments, and supporting read-only tools for AI agents.

Key Features:

• Local-First Architecture: Everything operates on your machine without the need for cloud storage. Users retain complete control over their financial data, ensuring privacy and security.

• Read-Only Financial Access: Connect to your bank securely through the SimpleFIN Bridge, which offers a read-only interface. Ledgerline does not access users' banking credentials, preventing unauthorized transactions. The entire financial database is held in a single .db file, providing an additional layer of data security — delete this file, and all traces are gone.

Demo of ledgerline functionality showing fabricated transactions and summaries.

Demo in Just 90 Seconds

Try Ledgerline without any financial commitments. The demo seeds six months of clearly fabricated transactions, allowing users to assess the features before connecting real data. Only a single prerequisite, uv, is required for the demo.

uvx --from ledgerline ledgerline demo
uvx --from ledgerline ledgerline summary  # View income/outflow by category
uvx --from ledgerline ledgerline upcoming # Check expected charges for the next 30 days

Getting Started with Real Data

Integrate real transactions effortlessly using one of two methods:

1. Bank Sync: Sign up at SimpleFIN Bridge to convert bank logins into read-only transaction feeds. After linking bank accounts, use the following commands to connect and sync:

   uv run ledgerline connect   # Input your setup token
   uv run ledgerline sync      # Import transactions
   

2. File Import: Download your financial export (CSV/OFX/QFX format) from your bank's website and ingest it into Ledgerline:

   uv run ledgerline ingest export.csv --account "Checking"
   

Enhanced AI Agent Interaction

Ledgerline provides a set of read-only tools through a local MCP (Model Control Protocol) server. Users can perform tasks such as:

• Monitoring data freshness,
• Conducting transaction searches,
• Reviewing spending summaries,
• Comparing periods and balances, and more.

Users can interact with AI agents to ask nuanced questions about spending patterns (e.g., "How much did I spend on dining in January?") without compromising banking credentials.

# Example Command to Add Ledgerline to Codex or Claude
codex mcp add ledgerline --env LEDGERLINE_DB=/absolute/path/to/ledgerline.db -- uvx --from ledgerline ledgerline-mcp

Usage Examples

Perform various financial operations with straightforward commands:

# Monthly summary of income/outflow
uv run ledgerline summary --month 2026-06

# Detect recurring payments
uv run ledgerline recurring detect
uv run ledgerline recurring add --label "Course tuition installment" --amount 850.00 --cadence monthly --day 21

Security Measures

Ledgerline incorporates multiple layers of security, ensuring:

• No sensitive data is parsed or stored (e.g., account numbers are never recorded).
• Tools for transactions and database access are designed for read-only operations, with stringent limits and checks on data alteration.

Contribution Opportunities

Users can also contribute by adding support for new bank profiles via a simple pull request to enhance the ingest capabilities of the tool. Each contribution strengthens the Ledgerline community and utility.

Testing and Quality Assurance

Maintaining high standards is crucial for Ledgerline. Comprehensive testing ensures that all features function correctly and securely, covering scenarios such as mixed-mode deduplication and transaction integrity across varied sources.

Ledgerline stands as a robust solution for anyone responsible for Budgeting and managing personal finance without compromising security or ease of use. By operating locally, it encourages a user-first philosophy that prioritizes both convenience and privacy.