Is there any free or cheap tool to set up an automated referral system for your website or app?

Looking to set up a referral system (think something like "invite a friend and get your next order free!") where a customer enters a friend's e-mail or has a unique code. I've found a few options, but they have very expensive monthly fees.
Pavan SethiProduct @ Stealth 🤐 · Asked

4 recommended

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Maître Viral Waiting List

Create a viral waiting list in 60 seconds

Kunal Bhatia22Co-founder & Design Lead @SlidesUp · Written
If you prefer a one-time charge for the full campaign, Maître offers a $79/campaign package.
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Ayush Mittal12bro @boombro, Founder RefR ✌ · Written
I used Maitre. Super simple to install as it's a widget that can be embedded on any web page. The design/font is adapted from the block you put the code into, however, you can customise most of the stuff from your Maitre dashboard. It also integrates natively with MailChimp and supports webhooks & callbacks, so that you can really customise it they way you want.
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Viral Loops for Startups

Virality for startups made easy 💪

Kunal Bhatia22Co-founder & Design Lead @SlidesUp · Written
Viral Loops is at the higher end of the budget with $49/month for up to 500 participants.
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Waitlisted

Increase email signups with gamification

Kunal Bhatia22Co-founder & Design Lead @SlidesUp · Written
Perhaps you can try Waitlisted. Not sure what your budget is, but monthly is $15/month. Annual is $60/year.
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GrowSumo

Get paid to recommend products you love

R A I Z APositivity Generator x Atlas Informatics · Written
Try this and see what you think - super fast setup (5-10 minutes) and relatively cheap: http://influencers.grsm.io/Raiza...
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