You should be able to log in now. We had a small issue with the invite system that affected 9 people that were sent invites.
We are still figuring out the cost for Tuned. But there will always be a free tier so people can get value even if they don't pay.
Other than that, if you're running millions of backtests, we will have to charge something because system resources aren't free.
If you're running 100 BTC every month, then we would charge something for creating that value for you.
In the end, we just want to democratize access to top tier trading tools while building a healthy company.