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.
Also known as
klaviyo.com
Website
klaviyo.com
Category
Sales & Marketing
Location
Boston, Massachusetts
Listed on Five Star Index
2026
About these reviews
Replies
The company replied to 61% of reviews.
Latest
Most recent review: October 2026.
Edits
Reviews are shown as their authors wrote them. The company can reply, but cannot edit them.
Score
This company cannot pay to remove reviews or change its score.
We've used Klaviyo as our ESP for almost 3 years now and have had a great experience. It's so easy to put together campaigns and flows, to create finely-tuned segments and to see your statistics. Their support staff is also very helpful. I recently had an issue regarding deliverability and meeting Google/Yahoo's new sender guidelines. Shelly and Luan from support walked me through it, found the issue and helped me solve it!
Response from KlaviyoMay 31, 2024
Hi Emma, that's great to hear - thank you very much for taking the time to write a review about your experience with Klaviyo. I'll pass your feedback back to the team. Kind regards, Claire
MA
Mikas A.
KLAVIYO offers unique opportunities for Magento 2 stores.
After a month of interaction, I can report mixed experiences. While some of my emails went unanswered initially, the staff eventually addressed the issues and issued a refund. Overall, their proposition is great. When actions are taken and issues are explained, they are effectively resolved.
Response from KlaviyoMay 29, 2024
Hi Mikas, thank you for taking the time to write a review about your experience - I'm sorry to hear about the frustrations you've described. If you'd like to share your details with me at [email protected], I'd be happy to look into the issues you've raised. I have requested your details. Kind regards, Claire
JR
Johanna R.
Great onboarding and service!
Great onboarding and service!
Response from KlaviyoMay 22, 2024
Thanks very much, Johanna, we appreciate you sharing your feedback. Kind regards, Claire
JV
Jorn van V.
Great marketing tool with great support
Klaviyo has been a fantastic tool for our email marketing purposes. The tool is packed with valuable features that are easy to use and highly effective. Very user friendly. The support team is also very valuable, always quick to help and very knowledgeable. We highly recommend Klaviyo for anyone looking to enhance their email marketing efforts.
Response from KlaviyoMay 22, 2024
Hi Jorn, that's lovely to hear! Thank you very much for taking the time to write a review about your experience with Klaviyo. Kind regards, Claire
MM
Mike M.
Stay away and use someone else!
Stay away and use someone else!
We've been with them for four years and it's gotten ridiculous. We had to spend 1200 for an email that had generated $200 in revenue. A complete ripoff.
There's better options. Support is the worst. At some point, they were the only players in the ecommerce game. Things have changed. Stay away because they will steal from you when you have actual volume.
Response from KlaviyoMay 22, 2024
Hi Mike, thank you for taking the time to write a review. If you'd like me to look into the frustrations you've described, please drop me a line at [email protected]. Kind regards, Claire
HW
Hugo W.
Great onboarding and service!
The onboarding experience has been great. As an agency onboarding our biggest client so far, the support with migration to klaviyo and solving deliverability issues has been very valuable. Now our largest client has increased revenue from email by 200%, and we're just getting started!
Response from KlaviyoMay 22, 2024
Hi Hugo, that's great news! Thank you very much for sharing your feedback. Kind regards, Claire
BK
Brian K.
Steer clear from Klaviyo!
, I just thought I’d share my recent experience with Klaviyo. My wife’s boutique has been using Constant Contact for many many years. She now grown to 5 stores and a couple different people recommended using Klaviyo.
I thought I’d give it a try but unfortunately have to say I was very disappointed. Instead of writing a review I thought I’d reach out to them first since I believe a company should be given an opportunity to make it right if they have integrity.
It started with me emailing the company last week and received a friendly call back from a sales person. She scheduled a zoom appointment with an account manager to go over how to set up the account. He was kind enough and briefly showed me how it works. He sent a demo video with a link that didn’t work. Also, what I didn’t realize is that he didn’t tell me to clean up the contacts from constant contact before importing them since I originally had 2500 but it turned out to be 5000 after importing which brought my monthly rate up. I then had trouble finding the right template for a subscriber page when customer support got back to me a day later with an email that really wasn’t helpful. I sent an email after being frustrated by spending way too much of my time trying to work out different problems on Sunday night and still never heard back from anyone. I eventually called the account manager on his cell phone since it was on his email and he told me he’d call me Tuesday and help me cancel or help figure it out. I have to say for a first time customer using this platform hasn’t been a good experience with the lack of communication and service. I hope this isn’t their typical way of taking care of customers. Now, the after all the trouble with their system I’m having to jump through hoops to get my money back after subscribing for only three days. That’s when I decided to share my experience. Stay away from Klaviyo!
Response from KlaviyoMay 22, 2024
Hi Brian, thank you for taking the time to write a review. I'm sorry to hear about the frustrations you've described and I will share your feedback with the team. If there are any outstanding issues I can look into for you, please drop me a line at [email protected]. Kind regards, Claire
SC
S.C
Disappointed by the lack of proactive customer care and flexibility in billing issues
I've had a complex journey with Klaviyo that has left me with mixed feelings. Initially, I was optimistic about our partnership, especially with the platform's capabilities. However, my experience with their billing practices has significantly tainted my perception.
The main issue arose with unexpected overage charges at the end of our contract year. Despite our adherence to the contract terms, Klaviyo did not provide real-time billing or adequate notifications for profile overages, leading to a substantial, unforeseen bill. This was a stark contrast to the quarterly invoices we paid diligently, which never hinted at any problems.
When we raised our concerns, the responses were often focused on justifying the existing protocols rather than addressing our frustrations. Although the team was polite and the management did engage with us, the overall approach felt rigid and unaccommodating. The emphasis seemed to be on sticking to the contract rather than ensuring customer satisfaction and fostering long-term relationships.
It's also worth noting that while the platform allows for usage tracking, the lack of proactive engagement from Klaviyo about nearing profile limits was disappointing. We were informed mid-year that there wouldn’t be immediate billing for overages but weren’t clearly warned about the end-of-year accumulation either.
While Klaviyo offers robust features and has potential for great value, their handling of our situation felt more transactional than relational. Moving forward, I will be more cautious and vocal about my experiences, hoping that Klaviyo might someday prioritize customer support as much as they do their software development.
UPDATE: Despite being informed that my case would be escalated and that someone would reach out to me, I have not received any follow-up contact from Klaviyo. This lack of response has only reinforced my frustration and disappointment. It seems that promises of escalation and better communication were just empty words, further highlighting the shortcomings in their customer service approach.
Response from KlaviyoMay 22, 2024
Hi Şükrü, thank you for taking the time to write a review about your experience with Klaviyo. I will share your valuable feedback on the matters you've raised here with the team. Kind regards, Claire