The best alternatives to OnboardFlow are UserGuiding, Onboard, and Seedform. If these 3 options don't work for you, we've listed a few more alternatives below.
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Postman Recorder by DevTools— Export Postman APIs from browser
Seedform is a multi-step flexible form for onboarding your customers. It's fully customizable and themeable –– all with just a couple of clicks. Try Seedform to improve the way you gather data from your customers.