Yeah... I've been on most founder match sites, including 2 of 3 OP mentioned (FounderDating and CoFoundersLab) and found them to be useless. I'm a generalist (business/techy/industrial design). They are inevitably full of people already working on something (thus not available to team up) and some consultants looking for clients. The possibility of encountering the triple coincidence of a free agent with the complementary skills you need, and an interest in your startup's particular space and stage is almost zero.
I'd suggest:
* Attend action focused events like hackathons or startup wknd where you can get at least a little sense of how potential partners work.
* Minimize attendance at tech socials: they're mostly loud, biz-card waving, wastes of time, that get you no closer to getting a partner.
* Buy time at a big coworking space for a few months, where you can have meaningful 1-to-1 interactions with a large cross-section of people over time. A big space will include many people open to teaming up. Some founders I know met this way.
* You can start as a solo founder and if you're active about promotion (eg pitching/demoing at events), then you might stumble into someone who is free and interested in your particular space. When you do, attend a hackathon or work on long project together to test for fit.
* Maintain motivation - hard and the only thing that enables you to keep cycling through the possibilities.
I'd suggest:
* Attend action focused events like hackathons or startup wknd where you can get at least a little sense of how potential partners work.
* Minimize attendance at tech socials: they're mostly loud, biz-card waving, wastes of time, that get you no closer to getting a partner.
* Buy time at a big coworking space for a few months, where you can have meaningful 1-to-1 interactions with a large cross-section of people over time. A big space will include many people open to teaming up. Some founders I know met this way.
* You can start as a solo founder and if you're active about promotion (eg pitching/demoing at events), then you might stumble into someone who is free and interested in your particular space. When you do, attend a hackathon or work on long project together to test for fit.
* Maintain motivation - hard and the only thing that enables you to keep cycling through the possibilities.