The Firefly III Data Importer can import data into Firefly III
Why do you think that https://github.com/firefly-iii/firefly-iii is a good alternative to data-importer
The Firefly III Data Importer can import data into Firefly III
Why do you think that https://github.com/firefly-iii/firefly-iii is a good alternative to data-importer