I didn't know about Ledger [1], which this is said to be based on. It seems like a proper UNIX tool like Remind [2] but for finance. I would really like to use these types of applications all the time, but either usability suffers a lot or useful principles get lost when trying to integrate them with smartphones and tablets.

[1]: https://www.ledger-cli.org/

[2]: https://jlk.fjfi.cvut.cz/arch/manpages/man/remind.1