For referral programs, looks like ReferralCandy was the most recommended in this earlier discussion about referral programs for email marketing.
Then, for more traditional affiliate programs, I'd done a bit of research a while back for this other discussion, which has a handful of other apps you might want to check out:
From checking a number of tools, Post Affiliate Pro seems to support the most languages with 36 supported languages today including Chinese, Arabic, Japanese, Turkish, Polish, Russian, Portuguese, Spanish, French, and more. You can add your own translations as well—with a discount on your subscription if you help add a translation. And at the same time, it supports multiple currencies for international sales.
For referrals, InviteReferrals is focused solely on rewarding customers for referring new customers—so you could give your customers (or both the customer and the person they refer) a coupon or gift voucher if they share your page and then someone signs up. It also supports 30 languages including Chinese, Korean, Thai, Hebrew, Arabic, German, French, Russian, and more.
There are a number of larger affiliate platforms that include little detail on their site about internationalization. Performance Horizon's Partnerize (who runs Apple's affiliate program, among others) says it supports 30 languages, and Rakuten Marketing's dashboard is in 5 languages while it says it supports affiliates in 202 countries. Commission Junction lists 6 country sites but doesn't mention supported languages. These each require contacting a sales team to start using their platforms.
Otherwise, many popular affiliate tools only support English or a handful of languages. Tune (formerly HasOffers) supports 14 languages and lets you edit their language files—though only with Enterprise plans. Tapfiliate supports only 6 European languages. LeadDyno lets you fully customize your affiliate site's CSS—and it suggest using that feature to edit the copy on the entire affiliate site. That makes it possible, but far from easy, to internationalize.
A fun newer option I've used for small campaigns is Viral Loops—though they only support English (you could change the form language yourself, but not the dashboard).
Crowded market, I've been researching options also and hadn't even come across the ones @maguay mentioned! The two I'm currently considering are TapAffiliate and Rewardful. Key benefits I'm looking for are API access for custom ecommerce integration, Stripe integration, and white-label or agency-style management options.
I am thinking of trying Referral Hero and Vyper. Both looks promising based on initial research. Neil Patel has reviewed and shortlisted GetAmbassador, ReferralRock, FriendBuy and Extol.
I personally haven't used this yet but I do remember Nathan Barry talking about LinkMink(https://linkmink.com/).
ConvertKit does seem to run one of the most successful affiliate marketing programs out there with them doing nearly half a million a month through affiliate marketing.
We use Rewardful at Podia, and love it. Super simple interface, and they push updates/improvements often.
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