Is MiroFish free?
Short answer: MiroFish is open source and free to run yourself, and the hosted version lets you start without paying or configuring anything. Larger runs on the hosted app may use paid credits.
Free ways to use MiroFish
The full source code is public on GitHub, so you can run it on your own machine at no cost. The hosted app at mirofish.us also lets you begin a simulation for free — useful if you just want to see a prediction report without any setup.
When it costs
Heavier or larger simulations on the hosted product can consume credits. Check mirofish.us for current pricing; there is no charge to read the open-source code or to try a first run.
Do I need a credit card to start?
No — you can start a run in the browser at mirofish.us without any setup.
Can I run MiroFish for free forever?
Yes, if you self-host the open-source version from GitHub; the hosted app may charge for heavier usage.