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Firefly III, made moddable

Firefly III keeps your money on your own server, and every bank and household does money slightly differently. The adapter exposes hooks over imports, rules and reports, so the long tail of local formats and family arrangements becomes installable mods.

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Ready to modifyupstream
  • 6.3latest · Jul 2026
  • 6.1maintained · Mar 2026
  • 5.8frozen · Sep 2025
LicenseAGPL-3.0
Mods3
Variants486

Security patches reach your version quickly. Bigger upstream releases wait until your changes are checked against them.

Need something else from Firefly III?

Describe the change in your own words. An agent implements it and you judge it on a live preview before it becomes a mod.

Things people ask for in Firefly III:

2 changes have been asked for here. Popular requests get built once and maintained for everyone.

Mods for Firefly III

Each one started as somebody's request and is now a capability you can switch on, with tests and compatibility history.

Firefly III

Santander N43 import

Import Banco Santander statements in Norma 43 format, matched to your transactions.

6.3passing96by Tomás Herrera
Firefly III

Roommate splits

Split any transaction across roommates and always know who owes what.

6.3passing118by Elske de Vries
Firefly III

Envelope rollover

Unspent budget rolls into next month, the way paper envelopes always worked.

6.3passing74by Andrés Quilapán

Asked for, not built yet

Aggregated demand. When enough people back a request, it gets built once and maintained for everyone who runs it.

Bizum detection on transfers

Tag incoming Bizum payments and match them to shared expenses.

13 backers

Multi-currency net worth

One net-worth chart across EUR and USD accounts, converted at daily rates.

5 backers

Do you maintain Firefly III?

This page is claimable. Set brand rules, endorse or discourage mods and receive your share of what they earn here.

For maintainers