https://www.raidbots.com/simbot/droptimizer
Under Sources, select Azerite Vendor, or Eternal Palace, or Mythic+ etc depending on what you’re searching for.
Also keep in mind raidbots sims are DPS only. If you’re looking for healer stuff, try https://questionablyepic.com/mistweaver-monk/azerite/
Edit: I noticed what you were alluding to. Azerite items outside of the vendor can’t be simmed without Premium.
You can only really sim what you have in your bags. I use Wowhead guides to get my BiS info also so it cuts down on the sims per session so you do not go over the limit and have to pay to get more results or add more pieces to the sim.
That’s weird. I did sim benthic azerite before with gear compare.
Though, I did have a problem with item search before. Basically it’s because I’m mostly using ipad. And apple have this smart punctuation that change straight apostrophe into prettier curly apostrophe. I don’t know if other OS have this similar function. But raidbot won’t search the curly apostrophe.
Welp, i put Azerite pieces in my bag, and use best in bag, check all the azerite perks and it compares it for me for free. I think i just can not go over 64 iterations i think it is. Just tried it a few min ago and it was working that way, so yeah, working for me free.