A pre-launch raise is really hard but not impossible. I raised a seed round for a mobile app that hasn't launched but it was quite honestly incredibly difficult and I wouldn't recommend others trying it!

I answered a question about when is best to raise under what circumstances here: https://clarity.fm/a/3484

I have helped many Clarity members with early-stage fundraising advice and would be happy to talk to you about what makes most sense for you and your company.