The best alternatives to Promo are Viral Loops, CrewFire, and Accrufy. If these 3 options don't work for you, we've listed a few more alternatives below.
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CrewFire is a brand ambassador platform that helps e-commerce brands drive more referrals, word-of-mouth, user-generated content, and engagement, by turning their customers into their army of brand ambassadors on social media (and beyond).
Accrufy is a free, full accounting solution for small businesses. You can create customer invoices in minutes and track bills and expenses. Send invoices/estimates directly on the go and track payments.
Fuze is a simple yet powerful post-purchase funnel & one-click upsell app. It allows you to customize your thank-you page and generate traffic on autopilot! Easy setup and no coding required.