Hey David, I run a similar service called Lean Domain Search [1] and was excited to check out your service.<p>A few ideas:<p>- If you're willing to consider limiting the TLDs to just .coms, you can then use the .com zone file to check the availability of domains much much faster than methods. Using this technique Lean Domain Search is able to check the availability of 5,000 domains in about a second. I wrote about how to get access to the VeriSign zone file here [2]. Parsing it so your app can access it in real time is tricky, but I can go into more detail over email if you want to explore that route.<p>- One thing to think about is whether figuring out the search volume is that important for your users. If it's a challenge getting that data from SEMrush or if it's slow or if it just clutters up the interface, consider dropping it and focusing on the quality of the suggestions. More information is not necessarily better for users (it depends what problem you are solving and for whom).<p>- If you want to a quick list of prefixes and suffixes to pair the user's search term with, I previously analyzed all registered .com's to figure out what the most common ones are. That list is available here if you're interested [3].<p>- I wound recommend identifying a specific pain point that a specific group of users have that isn't addressed well by existing tools and focus all of your efforts on solving that. The more focused you make your app, this better.<p>Props on getting users to tweet about the app to show more suggestions. I used to do that with Lean Domain Search and it works really, really well.<p>I'm happy to chat over email if you'd like. See my profile for contact details.<p>Best of luck with this -- congrats for launching!<p>[1] <a href="http://www.leandomainsearch.com" rel="nofollow">http://www.leandomainsearch.com</a><p>[2] <a href="http://www.leandomainsearch.com/blog/16-how-to-get-access-to-the-official-verisign--com-zone-file" rel="nofollow">http://www.leandomainsearch.com/blog/16-how-to-get-access-to...</a><p>[3] <a href="http://www.leandomainsearch.com/top-domain-name-prefixes-and-suffixes" rel="nofollow">http://www.leandomainsearch.com/top-domain-name-prefixes-and...</a>