Summit E.
Great email service provider
Great email service provider, my recent agency onboarded me with them after moving me from mailchimp

Klaviyo powers smarter digital relationships. We make it easy for B2C businesses to transform all their data into more valuable customer experiences across every touchpoint — from email and SMS to web and reviews. More than 157,000 businesses rely on Klaviyo to grow their revenue faster and more efficiently.
Klaviyo (klaviyo.com) has 355 customer reviews on Five Star Index, with an average rating of 2.6 out of 5.
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Sales & Marketing · Boston, Massachusetts
Excellent

Sales & Marketing · Boston, Massachusetts
Excellent

Sales & Marketing · Winchester, Massachusetts
Excellent

Sales & Marketing · Boston, Massachusetts
Excellent
355 approved reviews, newest moderated first
Summit E.
Great email service provider, my recent agency onboarded me with them after moving me from mailchimp
Ibrahim A.
Best Support
Jens
⸻ Going from $39/month to over $200/month overnight due to a change in business model is unacceptable. We send maybe two campaigns a month, yet under the new model you get charged simply for storing a profile — even if you never email them. On top of that, there are persistent bugs with abandoned emails that we’ve tried to resolve multiple times with their so-called “support,” but without success.
Gregory
Shocking support - long delays as the chat person seems to toggle through multiple support chats. doesn't give fully articulated instructions, comment are piecemeal which makes the whole process ineffective, annoying and overly time consuming. Do not subscribe to Klaviyo - worst tool ever.
james R.
while klaviyo has a good app it is really difficult to manage costs. They work hard to increase subscriber numbers which is good but then it is really difficult to pare them down in time for the auto subscription charge Charges automatically go up with subscriptoins but do not go down I have yet to figuer out how they go down Also Klaviyo is the one calculating the number of customer so that is perhaps asking your customer how many pancakes did you use. as the subscriptoin fees ratchet up quickly with subscriber counts it gets expensive
Klaviyo S.
Klaviyo is trash. They force paying customers to keep spam profiles active because they only allow you to suppress a profile (the allowance to choose to not email a profile) once every 90 days. So bots keep signing up, we keep suppressing those sign ups, only for these bots to re-sign up. When they do that, we can’t re-suppress them for THREE MONTHS. Now mind you, Klaviyo charges a subscription PER ACTIVE PROFILE. I escalated my request to surpass the 90-day restriction, and you know what they said? “wE cAnT dO tHaT!!1 pEOpLe WiLL dEaCtiVaTe pRoFiLeS bEfOrE BiLLinG dATe aNd rEaCTiVaTe tHeM aNd wE’ll LoSe MoNeY!!!111”. Awww someone think of this poor 8 BILLION DOLLAR company! They want YOU, business owner, to lose money by paying them to keep spam profiles active instead! Not them! They will actually MAKE UNDESERVING MONEY because you anre forced to keep paying for SPAM ACCOUNTS! That’s why they won’t solve your problem. They profit off of it! ABSOLUTE GARBAGE COMPANY, stay away!!! P.S: if they respond saying you can add double opt-in, that is a botched solution that DOES NOT SOLVE THE ISSUE, and only adds obstacles for legitimate sign ups, meaning their solution WILL make your business suffer. You’ll get fewer sign ups, add one extra unnecessary hurdle to you getting new customers, AND DOESN’T STOP BOTS. Klaviyo, I hope your competitors read this and crush you out of existence.
tom
i am 83 and ripped off by klaviyo install error shut down my site 3 days while i figured out how to fix, klaviyo re fused to help and when i asked for help with complicated installation i was referred to videos. program show 15 steps to install an when i asked support about the steps she asked where i found that. after total failure and losing several thousasnds klaviyo refulsed to make a refund
Aaron P.
Persistence in Dealing with a Sticky Issue, Luan stayed with the case following up with engineering to ensure they resolved the issue. It was a very tricky case which required dev teams to get invovled, and he followed up with them to make sure they finally got it solved.