Costflow vs Firefly III
A side-by-side comparison of two self-hosted budgeting & finance options — licensing, setup difficulty, resource needs, and what each one replaces.
Firefly III
Self-hosted personal finance manager
| Feature | Costflow | Firefly III |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 0 · At risk | 97 · Excellent |
| Category | Budgeting & Finance | Budgeting & Finance |
| License | MIT | AGPL-3.0 |
| Language | JavaScript | PHP |
| Setup difficulty | Medium | Medium |
| Min. RAM | 128 MB | 512 MB |
| Deployment | source, binary | docker, bare-metal, source |
| GitHub stars | ★ 33 | ★ 24,712 |
| First released | 2019 | 2016 |
| Replaces | Expensify, Mint | Mint, YNAB |
What are Costflow and Firefly III?
Costflow
Costflow is an open-source parser that turns plain-language messages into Beancount, Ledger, or hledger entries. It lets users record transactions from chat apps and append them to a journal file.
- Natural-language entries
- Beancount and Ledger output
- Chat app integration
- Plain-text journals
Firefly III
Firefly III is a free, open-source personal finance manager. It helps you track income, expenses, budgets, and bills, with rules for automatic transaction categorization and detailed reporting.
- Budgeting and bill tracking
- Rule-based auto-categorization
- Detailed financial reports
- REST API and data importer
Costflow vs Firefly III: key differences
Costflow is written in JavaScript, while Firefly III is built with PHP. Licensing differs — MIT for Costflow versus AGPL-3.0 for Firefly III. Costflow is the lighter option, starting around 128 MB of RAM against 512 MB for Firefly III. Firefly III is the more established project (first released 2016), while Costflow arrived in 2019. Firefly III has the considerably larger community, at 24,712 GitHub stars versus 33. Firefly III lists first-class Docker deployment; Costflow does not.
Why pick each one
Choose Costflow if…
- Released under the MIT license
- Written in JavaScript
- Tiny footprint — runs in 128 MB RAM
Choose Firefly III if…
- Powerful budgeting features
- Strong API for automation
Watch out for
- Manual entry unless importing
- Steeper learning curve
Frequently asked questions
Is Costflow or Firefly III better?
Neither is universally better. Firefly III has the larger community; both share a medium setup difficulty, so the decision comes down to features and licensing.
Are Costflow and Firefly III free and open-source?
Yes. Costflow is licensed under MIT and Firefly III under AGPL-3.0. Both can be self-hosted at no software cost.
Can I run Costflow and Firefly III with Docker?
Costflow: check the project docs for container support. Firefly III: yes.
Which is lighter on resources, Costflow or Firefly III?
Costflow has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for Firefly III. Real-world usage depends on library size, user count, and enabled features.