Firefly III
A free and open source personal finance manager
About Firefly III
Firefly III is a self-hosted, open-source personal finance management application that helps users track expenses, income, and budgets using a double-entry bookkeeping system. It supports multiple currencies, automated transaction rules, and comprehensive financial reporting, all running entirely on your own server for maximum privacy.
Pros & Cons
Pros
- Completely free with no subscription fees or premium tiers
- Full data privacy — self-hosted and your data never leaves your server
- Flexible budgeting with surplus funds flowing into piggy banks
- Unlimited users with no per-seat charges
- Powerful rule engine for automated transaction categorization
- Extensive REST API for custom integrations
Cons
- Complex setup requiring Docker or manual server configuration
- Steep learning curve compared to consumer tools like YNAB
- CSV import has strict format requirements
- No native mobile app (web-based only)
- Self-maintenance burden for updates, backups, and server upkeep
Key Features
Double-Entry Bookkeeping
Full double-entry accounting system for accurate financial tracking across multiple account types
Multi-Currency Support
Track transactions and set budgets in multiple currencies simultaneously
Budgeting & Piggy Banks
Create budgets with spending limits and use piggy banks for savings goals
Automated Rules Engine
Define rules to automatically categorize, tag, and clean up imported transactions
Data Import
Dedicated Data Importer tool for importing bank CSV files and financial data
Advanced Reporting
Detailed expense reports by week, month, or year with account auditing
REST JSON API
Expansive API covering transactions, categories, budgets, and chart data
Recurring Transactions
Set up scheduled recurring transactions for regular bills and income
Pricing
- All features included
- Double-entry bookkeeping
- Multi-currency
- Budgets & piggy banks
- Rule engine
- API access
- Unlimited users
Best For
Privacy-Conscious Finance
Full control over financial data without sharing with third-party SaaS providers
Multi-Currency Tracking
Digital nomads and freelancers who earn and spend in multiple currencies
Household Budget Management
Families managing shared finances with multiple users and savings goals
YNAB/Mint Alternative
Free, open-source replacement for paid budgeting tools
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