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Tally.so offers unlimited forms & responses for free, F5Bot or Syften for tracking mentions across the web, Notion + Super for landing pages

Second the suggestion for Syften, I have found it very powerful for finding people asking questions in forums that represent a relevant need.

I'd caution you away from Paypal — they're going through tons of API changes right now and their API broke down the week before our conference, and I had to swap it out for Stripe's API at the last minute.

You are using very new platforms. Have you had issues with more established ones?