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Responsive Flask/SQLAlchemy personal finance app, specifically for biweekly budgeting.

For full documentation, see

For screenshots, see

For development activity, see


biweeklybudget is a responsive (mobile-friendly) Flask/SQLAlchemy personal finance application, specifically targeted at budgeting on a biweekly basis. This is a personal project of mine, and really only intended for my personal use. If you find it helpful, great! But this is provided as-is; I'll happily accept pull requests if they don't mess things up for me, but I don't intend on working any feature requests or bug reports at this time. Sorry.

The main motivation for writing this is that I get paid every other Friday, and have for almost all of my professional life. I also essentially live paycheck-to-paycheck; what savings I have is earmarked for specific purposes, so I budget in periods identical to my pay periods. No existing financial software that I know of handles this, and many of them have thousands of Google results of people asking for it; almost everything existing budgets on calendar months. I spent many years using Google Sheets and a handful of scripts to template out budgets and reconcile transactions, but I decided it's time to just bite the bullet and write something that isn't a pain.

Intended Audience: This is decidedly not an end-user application. You should be familiar with Python/Flask/MySQL. If you're going to use the automatic transaction download functionality, you should be familiar with Hashicorp Vault and how to run a reasonably secure installation of it. I personally don't recommend running this on anything other than your own computer that you physically control, given the sensitivity of the information. I also don't recommend making the application available to anything other than localhost, but if you do, you need to be aware of the security implications. This application is not designed to be accessible in any way to anyone other than authorized users (i.e. if you just serve it over the web, someone will get your account numbers, or worse).

Note: Any potential users outside of the US should see the documentation section on Currency Formatting and Localization; the short version is that I've done my best to make this configurable, but as far as I know I'm the only person using this software. If anyone else wants to use it and it doesn't work for your currency or locale, let me know and I'll fix it.

Important Warning

This software should be considered beta quality at best. I've been using it for about a year and it seems to be working correctly, but I'm very much a creature of habit; it's entirely possible that there are major bugs I haven't found because I always do the same action in the same way, the same order, the same steps, etc. In short, this application works for me and the exact particular way I use it, but it hasn't seen enough use from other people to say that it's stable and correct in the general case. As such, please DO NOT RELY ON the mathematical/financial calculations without double-checking them.

Main Features

  • Budgeting on a biweekly (fortnightly; every other week) basis, for those of us who are paid that way.
  • Periodic (per-pay-period) or standing budgets.
  • Optional automatic downloading of transactions/statements from your financial institutions and reconciling transactions (bank, credit, and investment accounts).
  • Scheduled transactions - specific date or recurring (date-of-month, or number of times per pay period).
  • Tracking of vehicle fuel fills (fuel log) and graphing of fuel economy.
  • Cost tracking for multiple projects, including bills-of-materials for them. Optional synchronization from Amazon Wishlists to projects.
  • Calculation of estimated credit card payoff amount and time, with configurable payment methods, payment increases on specific dates, and additional payments on specific dates.
  • Ability to split a Transaction across multiple Budgets.


Note: Alternatively, biweeklybudget is also distributed as a Docker container. Using the dockerized version will eliminate all of these dependencies aside from MySQL (which you can run in another container) and Vault (if you choose to take advantage of the OFX downloading), which you can also run in another container.

  • Python 2.7 or 3.4+ (currently tested with 2.7, 3.4, 3.5, 3.6 and developed with 3.6)
  • Python VirtualEnv and pip (recommended installation method; your OS/distribution should have packages for these)
  • MySQL, or a compatible database (e.g. MariaDB). biweeklybudget uses SQLAlchemy for database abstraction, but currently specifies some MySQL-specific options, and is only tested with MySQL.
  • To use the automated OFX transaction downloading functionality:
    • A running, reachable instance of Hashicorp Vault with your financial institution web credentials stored in it.
    • If your bank does not support OFX remote access ("Direct Connect"), you will need to write a custom screen-scraper class using Selenium and a browser.


It's recommended that you install into a virtual environment (virtualenv / venv). See the virtualenv usage documentation for information on how to create a venv.

This app is developed against Python 3.6, but should work back to 2.7. It does not support Python3 < 3.4.

mkdir biweeklybudget
virtualenv --python=python3.6 .
source bin/activate
pip install biweeklybudget


biweeklybudget itself is licensed under the GNU Affero General Public License, version 3. This is specifically intended to extend to anyone who uses the software remotely over a network, the same rights as those who download and install it locally. biweeklybudget makes use of various third party software, especially in the UI and frontend, that is distributed under other licenses. Please see biweeklybudget/flaskapp/static in the source tree for further information.

biweeklybudget includes a number of dependencies distributed alongside it, which are licensed and distributed under their respective licenses. See the biweeklybudget/vendored directory in the source distribution for further information.