CRM
08 Jul 2026

Klaviyo Agencies: Top 5 Best Agencies | datashake

Salomé Boukobza
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Head of CRM
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6 min
Agences Klaviyo : top 5 des meilleures agences | datashake
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Are you using Klaviyo, or thinking about using it, to manage your SMS and email campaigns? We strongly recommend maximizing the potential of this tool by entrusting your campaign management to a digital marketing agency with real expertise in the field.

Klaviyo is currently the most advanced marketing automation platform on the market, and if you haven't adopted it yet, we highly encourage you to do so. This guide is designed to walk you through the top 5 best Klaviyo agencies, while also giving you the key criteria to find the agency that aligns perfectly with your needs and goals.

What Is Klaviyo?

Klaviyo is an automated marketing platform that helps businesses manage and optimize their email and SMS campaigns. It offers powerful tools for segmenting audiences, personalizing messages, and analyzing campaign results to improve customer engagement. Klaviyo is particularly popular in e-commerce for its ability to create tailored customer experiences and integrate data from multiple sources.

Selection Criteria for Finding the Best Klaviyo Agency in Paris

Finding the best Klaviyo agency in Paris takes more than comparing promises or price points. Several key criteria must be evaluated to assess an agency's quality and professionalism.

Here are the main factors to consider.

Klaviyo Expertise and Certifications

Klaviyo expertise is the top criterion. This means the agency has a thorough command of the platform and all its features. A competent agency should be able to effectively set up, optimize, and analyze your email and SMS marketing campaigns.

It should also hold a Klaviyo certification, proving it has received official platform training and follows the best practices recommended by Klaviyo. Certifications can be verified directly on the official Klaviyo website.

Track Record and Case Studies

The agency's track record and case studies are the second essential criterion. It's important to look into testimonials and results the agency has achieved for its past clients.

A quality agency should be able to share specific examples of successful campaigns that delivered a meaningful return on investment. Don't hesitate to request detailed case studies or ask to speak with former clients for their firsthand perspective.

Market Knowledge

The third criterion to evaluate is the agency's knowledge of the local, national, or international market and its specific dynamics. The agency needs to understand your target audience's needs and expectations, as well as the unique characteristics of your industry. A strong agency will know how to adapt to your market and develop campaigns that are tailored and relevant for your prospects and customers.

Services Offered and Specialization

Finally, the agency's range of services and specialization represent the fourth key criterion. Make sure the agency offers the services you need and has expertise in the areas that matter to you. A top-tier agency should guide you end-to-end through your email and SMS marketing strategy, from defining objectives to ongoing optimization, including template creation and performance tracking.

It should also have a specialization in your niche or industry, giving it a better understanding of your specific challenges and opportunities.

The Top 5 Best Klaviyo Agencies

If you're looking to supercharge your email and SMS marketing, choosing a Klaviyo agency is an excellent decision. With so many agencies in Paris, the real question is: how do you make the right choice?

We've put together the top 5 best Klaviyo agencies in Paris, based on key criteria. Below you'll find a detailed breakdown of each agency, including their strengths and areas of specialization.

Detailed Analysis of Each Agency

For this analysis, we explored agency websites, client testimonials, Klaviyo certifications, case studies, and pricing.

Here's what we found.

1. datashake

Ranked number 1 on Klaviyo, datashake has been helping businesses of all sizes optimize their email, SMS, and WhatsApp marketing campaigns since day one. Specializing in a personalized approach, the agency stands out for delivering tangible results and recognized expertise.

With recognized certifications and unmatched expertise, datashake offers:

  • Full Klaviyo management: segmentation, automated flow creation, and detailed reporting.
  • A proven track record of improved performance: +85% in email traffic and +20% in repeat purchases on average for its clients.
  • A tailored approach that adapts to your needs, regardless of your industry.

What sets datashake apart?

  • Expert support: a free audit to identify your opportunities and an optimized strategy to maximize your results.
  • Multi-channel expertise: seamless integration with SMS, WhatsApp API, and email marketing.
  • An ROI-focused vision: datashake contributes an average of 30% of its clients' revenue through powerful CRM campaigns.

datashake offers a free audit, giving you a complete assessment of your CRM strategy and a clear path to improving it. This no-commitment audit is your chance to have your current digital strategy analyzed by experts. For more information, contact us through our website or by email at hello@datashake.fr.

2. Stellar Projects 

Stellar Projects is made up of a team specializing in marketing campaign management. The agency primarily helps businesses implement digital solutions to support their marketing efforts.

They offer technical integration with Shopify, enabling full use of Klaviyo's features. They also provide services such as customer segmentation, form setup, and development of email templates tailored to each business's needs.

3. e-mailio

E-mailio brings together marketing automation experts. The agency provides services related to the configuration and use of digital tools for email and SMS campaigns.

They offer segmentation services to target specific audiences with tailored messages. Their approach also includes A/B testing to refine campaigns based on performance data.

4. mutzii

mutzii is an American agency that supports businesses with their Klaviyo campaigns. The agency provides full campaign management, with expertise spanning auditing, advanced audience segmentation, optimized content creation, and effective automation strategies. By carefully analyzing your data, they help you maximize customer engagement and conversions.

5. Flowium

Flowium's versatile team of designers, developers, and copywriters will help you create engaging emails tailored to your customers' purchase journey. 

Flowium sets up personalized automation flows, for example to re-engage customers who added items to their cart but didn't convert. The Flowium team uses predictive analytics to anticipate customer behavior and send messages at exactly the right moment. With ongoing monitoring and detailed dashboards, Flowium ensures continuous improvement of your marketing performance.

How to Work Effectively with a Klaviyo Agency

If you've chosen a Klaviyo agency from our top 5, congratulations! You've taken a major step toward supercharging your email and SMS marketing.

But how do you make the most of this partnership? How do you make sure the agency truly understands your needs and hits your goals?

Here are a few tips for a successful collaboration with a Klaviyo agency.

Define Your Objectives and Needs

Before launching a project with a Klaviyo agency, clearly define your objectives and needs. Which performance metrics do you want to improve? What is your budget? What is your timeline?

Identify the specific challenges or opportunities in your industry and outline the characteristics of your target audience. These answers will help you write a clear, realistic brief, which is essential for the agency to develop a strategy tailored to your situation.

Communication and Collaboration

Ongoing communication and collaboration are critical throughout the project. It's important to stay informed about progress, sign off on key milestones, share your feedback, and address any issues that come up. Project management tools like Notion, Trello, or Asana can streamline these exchanges and help keep the project on track.

Scheduling regular check-in meetings with the agency is also a great way to review results and align on next steps.

Track and Measure Success

It's essential to track and measure the effectiveness of your collaboration through the success of your email and SMS marketing campaigns. Define key performance indicators (KPIs) such as open rate, click-through rate, conversion rate, revenue, and return on investment. Use analytics tools like Google Analytics or Klaviyo to monitor these KPIs and evaluate performance against your initial goals.

Evolving and Adjusting Strategies

For an effective collaboration with a Klaviyo agency, be prepared to evolve and adjust your strategies based on results and market trends. It's essential to continuously optimize your campaigns by testing different approaches, analyzing data, and taking customer feedback into account. Stay open to the agency's recommendations and be ready to adapt your campaigns as needed.

Conclusion

You now have everything you need to choose the best Klaviyo agency. You know the essential criteria to consider, how to collaborate effectively with a Klaviyo agency, and you have our list of the top 5 best Klaviyo agencies at your fingertips.

It's time to take action and reach out to the agency that best fits your needs. Don't wait to take advantage of everything Klaviyo has to offer, the most advanced email and SMS marketing platform on the market.

You'll see revenue growth driven by personalized, automated campaigns that build lasting customer loyalty. So why wait? Contact datashake today, the expert Klaviyo CRM agency that will transform your email marketing strategy and maximize the impact of your campaigns!


If you're also looking to improve your online visibility, consider working with an SEO agency to optimize your website or a paid search agency to manage your online advertising campaigns.


Want support with your email marketing strategy? Feel free to get in touch!

FAQ

Why use Klaviyo?

Using Klaviyo means choosing a cutting-edge marketing automation platform that leverages customer data to craft personalized, targeted messages across email, SMS, push notifications, reviews, and web forms. Klaviyo also gives you the ability to precisely measure the performance and return on investment of your marketing campaigns across multiple channels.

What are the benefits of using Klaviyo?

Key benefits include campaign automation, advanced audience segmentation, in-depth performance analytics, and greater message personalization to improve engagement and conversions.

How do automations work in Klaviyo?

Klaviyo lets you build automated workflows triggered by specific events, such as sign-ups, cart abandonment, or purchases, to send timely, relevant emails without any manual effort.

Can you try Klaviyo before committing?

Klaviyo offers a free trial that lets you explore the core features and understand how the platform can benefit your marketing strategy before making a financial commitment.