The best open source alternative to Monetr is Actual. If that doesn't suit you, we've compiled a ranked list of other open source Monetr alternatives to help you find a suitable replacement. Other interesting open source alternatives to Monetr are: Sure.am and YAFFA.
Monetr alternatives are mainly Budgeting Apps but may also be Investment Tracking Tools. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Monetr.
Privacy-focused personal finance app using envelope budgeting, multi-device sync, optional end-to-end encryption, and bank sync for US, EU, and UK users.

Actual Budget is a personal finance management tool built around envelope budgeting, the method where you assign every dollar you actually have to a specific category before spending it. No projected income, no made-up numbers. You budget what's in your accounts right now, which keeps your plan grounded in reality.
It's local-first by design. Your data lives on your device, and the app works fully offline. Sync happens in the background across as many devices as you want, but a dropped connection doesn't stop you from using it. For people who've grown uncomfortable with cloud-first finance tools, that's a meaningful distinction.
Key capabilities:
The interface is intentionally minimal and fast. Categorizing transactions, reviewing spending, and moving money between envelopes are all optimized to take as few taps or clicks as possible. Dark mode and system-level theming are built in.
Actual is self-hosted. You run the sync server yourself, which means your financial data never touches a third-party service unless you choose bank sync. Among budgeting apps that offer this level of privacy, few match its combination of polished UI and full local control.
Looking for open source alternatives to other popular services? Check out other posts in the alternatives series and openalternative.co, a directory of open source software with filters for tags and alternatives for easy browsing and discovery.
An all-in-one personal finance platform. Track, optimize, grow, and manage your money through every stage of life.

Take control of your finances with a single, unified view of your money. Connect bank accounts, cards, investments, and even custom assets, or add everything manually when you prefer full control. Powerful transaction tools let you create, edit, tag, and link income, expenses, and transfers so your records always stay accurate and organized.
Key features:
Open-source and self-hostable, it offers transparent, privacy-first personal finance management built in public.
YAFFA is a powerful, open-source budget app for managing expenses, budgets, and investments with secure self-hosting.

YAFFA (Yet Another Free Finance Application) is a robust, open-source personal finance solution designed for individuals who value privacy and long-term financial planning.
Key features:
YAFFA empowers users to take control of their financial future without compromising on data privacy. Whether you're a budgeting novice or a seasoned investor, YAFFA provides the tools you need to make informed financial decisions and work towards your long-term goals.
Get started with YAFFA today and experience the freedom of managing your finances on your own terms, with no subscription fees or data sharing concerns.