What does Firefly III replace?

Firefly III is a free alternative to YNAB ($109/yr) and Monarch Money.

Is Firefly III open source?

Yes. Firefly III is licensed under AGPL-3.0, an OSI-approved open-source license.

Yes (self-hosted server; web UI).

Yes. Firefly III is a server app you run on your own server.

A free, open-source alternative to YNAB and Monarch Money. Switching saves $109/yr at list price.

Checked Oct 17, 2026 · How we check

Self-hosted server

Open source · AGPL-3.0 Linux Self-hostable

firefly-iii/firefly-iii24.9k★last push Oct 15, 2026checked Oct 17, 2026

Self-host

Runs on your own Linux server. Setup docs are on firefly-iii.org.

What does Firefly III replace?: Firefly III is a free alternative to YNAB ($109/yr) and Monarch Money.
Is Firefly III open source?: Yes. Firefly III is licensed under AGPL-3.0, an OSI-approved open-source license.
Does Firefly III run on Linux?: Yes (self-hosted server; web UI).
Can you self-host Firefly III?: Yes. Firefly III is a server app you run on your own server.