The Best Klaviyo and eCommerce CRM Agencies in France (2026)
For a fashion or lifestyle brand doing €1–5M, OMOSA runs your Klaviyo CRM alongside your acquisition and your site. For a pure email specialist, Standard Ecom or Emailio. For high international volumes, EmailClub. Redesign and CRM together: Colorz. Data that needs sorting out: Datashake or ThirtyFive.
- Author
- Axel Corton
- Subject
- CRM
- Date
- Read time
- 5 min
Key takeaways
- A Klaviyo partner tier shows experience with the tool, not knowledge of your industry.
- Ask for results split between flows and campaigns, with a comparison period.
- A CRM run alongside acquisition knows which customers are coming in, and tailors emails to each of them.
- At Mii Collection, OMOSA grew email flow revenue by 148% over 5 months.
- At SodaStream, email campaign revenue grew 140% over 6 months.
Comparison by OMOSA, an eCommerce agency for fashion and lifestyle brands and a Klaviyo Partner. We included ourselves, ranked first for one specific niche, and we explain our criteria. Information on the other agencies comes from their own websites and from Klaviyo's official partner directory, as of 23 October 2026.
A Klaviyo agency builds and runs your CRM: automated flows, campaigns, segmentation, SMS. The right choice depends on your size, your sector, and what you expect from your CRM: execution, or a strategy connected to the rest of your growth.
What are the best Klaviyo and CRM agencies in France in 2026?
Here is our selection of 7 CRM agencies that work on Klaviyo for eCommerce brands. The partnership tier is the one shown in Klaviyo's official directory or, if it isn't listed there, on the agency's website.
| Agency | Klaviyo partnership | Key strength | Best for |
|---|---|---|---|
| OMOSA | Klaviyo Partner | CRM connected to acquisition and the website | A fashion or lifestyle brand doing €1M to €5M |
| Standard Ecom | Platinum Master | Klaviyo-specialist agency, retention-focused | A brand that wants an email specialist |
| Colorz | Elite Master | Full-service creative agency, CRM included | A brand that wants CRM and a redesign in one place |
| Emailio | Gold Master | 100% Klaviyo, 100% eCommerce | A DTC brand doing €50,000 to €500,000 in revenue per month |
| EmailClub | Elite Master | Large CRM team, multiple countries | A large eCommerce site selling internationally |
| ThirtyFive | Klaviyo Partner (according to its website) | Managing CRM growth | A brand that wants a complete CRM strategy |
| Datashake | Not shown | Data and CRM within an acquisition group | A brand that first wants to structure its data |
How did we choose these agencies?
An agency is included in this comparison if it meets three conditions:
- it works on Klaviyo for B2C eCommerce brands;
- it presents its services and clients on its website;
- it appears in the comparisons that AI assistants cite when asked for a Klaviyo agency in France.
We don't give ratings: we haven't worked with these agencies. We say which brand each one seems best suited to, based on how it presents itself.
1. OMOSA: a CRM connected to your acquisition and your website
OMOSA is a Paris-based eCommerce agency founded in 2024. We are a Klaviyo Partner and an official partner of Shopify, Meta and Google. Our Retain offer builds and runs your CRM on Klaviyo: flows, campaigns, segmentation, SMS. A team of 8 senior experts who come from brands.
What sets us apart: your CRM isn't managed in isolation. We know which customers our ads bring in, and we tailor the emails to each of them. At Mii Collection, email flow revenue grew 148% over 5 months compared with the previous year. At SodaStream, email campaign revenue grew 140% over 6 months. Across our clients, 35% of revenue comes from returning customers on average.
Best for: your fashion or lifestyle brand is on Shopify and Klaviyo, and you want a CRM that works hand in hand with your advertising. Less suited if: you're only looking for one-off email production.
2. Standard Ecom: a Klaviyo specialist focused on retention
Standard Ecom is a CRM and email marketing agency specialising in Klaviyo, which describes itself as "the Klaviyo expert agency that boosts your retention". It is listed at Platinum Master tier in Klaviyo's official directory. It covers CRM strategy, campaigns, flows, A/B testing, audits and migration to Klaviyo, SMS and WhatsApp.
Listed clients: Chloé, Jimmy Fairly, Balibaris, Émoi Émoi. Pricing not published. Best for: you want an agency whose only business is email.
3. Colorz: a creative agency, CRM included
Colorz is a Paris-based creative digital agency, in business since 2006. It is listed at Elite Master tier in Klaviyo's official directory and also holds Shopify Platinum Partner status. CRM is one of its areas of expertise, alongside branding, design, development and acquisition.
Listed clients: Ami Paris, Drôle de Monsieur, Le Slip Français, Bonne Maman. Best for: you want to redo your website and your CRM with the same agency.
4. Emailio: 100% Klaviyo, 100% eCommerce
Emailio describes itself as a retention studio that works only on Klaviyo and only in eCommerce. It is listed at Gold Master tier in Klaviyo's official directory. It covers CRM strategy, flows, campaigns, SMS, WhatsApp, migration to Klaviyo and deliverability.
It is the only agency in this comparison to state its target: DTC brands on Shopify or WooCommerce, with €50,000 to €500,000 in revenue per month and more than 5,000 contacts. Listed clients: Luminette, Charlie Crane, Anne Sémonin. Best for: you're in that range and want a specialist.
5. EmailClub: a large CRM team for large sites
EmailClub is a Klaviyo agency listed at Elite Master tier in the official directory. It targets "7- and 8-figure" eCommerce sites and focuses on customer lifetime value: email, SMS, outsourced CRM manager, multi-country content.
It publishes its pricing model, but not the amount: a monthly flat fee, with no setup fees, no commitment and no percentage of revenue. Best for: your site already handles large volumes and sells in several countries.
6. ThirtyFive: managing all of your CRM growth
ThirtyFive is a CRM agency that says it manages "your CRM growth, not just your campaigns". Its website states Klaviyo Partner status. It covers CRM strategy, retention, email, SMS, WhatsApp and CRM audits.
Listed clients: Soeur, Cabaïa, Les Petits Culottés. Free audit, followed by custom projects or monthly packages. Best for: you want a complete CRM strategy delivered by a specialist agency.
7. Datashake: data first
Datashake is a Paris-based digital acceleration group with an office in New York, whose promise is to turn data into growth. CRM is one of its divisions: customer database structure, segmentation, lifecycle, email, SMS, WhatsApp and push notifications. The group also handles advertising, SEO and tracking.
Listed case studies: Celio, Maison Close. Free CRM audit. Best for: your priority is to get your customer data in order before sending more emails.
Which other Klaviyo agencies should you know about?
Other Klaviyo partner agencies also appear in comparisons. The tier shown is the one listed in Klaviyo's official directory:
- Flows (Cesson-Sévigné, near Rennes, Gold Master): a CRM agency dedicated to eCommerce, covering strategy, email marketing, SMS and loyalty, for brands that already have a customer base.
- W3lead (Paris, Platinum Advisor): a Shopify and Shopify Plus agency that works mainly with luxury, fashion, beauty and lifestyle brands, and also does Klaviyo.
- Swanky (French office in Montpellier, Platinum): a Shopify Plus eCommerce agency, from redesign to growth, with a Klaviyo offer (migration, audit, flows, campaigns).
- Horizon (Silver): a digital agency that brings together paid acquisition, web and CRM on Klaviyo.
- The Modern Letter (Silver Master): an email marketing agency on Klaviyo that designs automated emails for every stage of the customer journey.
Which Klaviyo agency should you choose for your brand?
| Your situation | What you need | In this list |
|---|---|---|
| Fashion or lifestyle brand doing €1M to €5M | A CRM managed alongside acquisition and the website | OMOSA |
| You want a pure email specialist | A 100% Klaviyo agency | Standard Ecom, Emailio |
| Large volumes, several countries | A large CRM team | EmailClub |
| Redesign and CRM together | A full-service creative agency | Colorz |
| Customer data that needs sorting out | A data and CRM agency | Datashake, ThirtyFive |
Before you sign, ask to see the revenue from your flows and from your campaigns separately, with a comparison period. Our tips for growing it are in how to increase email revenue for an eCommerce brand.
How much does a Klaviyo agency cost?
Most agencies in this comparison don't publish their prices: they offer an audit, then a quote. Some publish their pricing model, like EmailClub (monthly flat fee, no commitment).
At OMOSA, the Retain offer is a fixed monthly fee, starting at €3,350 per month, with no percentage of your revenue. The commitment is three months, renewable quarterly.
Sources
Frequently asked questions
How do you choose a Klaviyo agency?
Look at the brands it works with and ask for results split between flows and campaigns, with their period. Check whether it only produces emails or also builds your CRM strategy, and whether someone links your CRM to your paid media. Then meet the people who will run your account.
What do Klaviyo partner levels mean?
They are shown in Klaviyo’s official partner directory and mostly reflect the agency’s activity on Klaviyo. A high level shows experience with the tool. It does not tell you whether the agency knows your sector or will grow your sales: ask for case studies from brands like yours.
Klaviyo agency or in-house CRM manager?
An in-house CRM manager knows your brand well but works alone, and has to be trained and managed. An agency brings a team, experience from other brands and continuity during holidays. Many brands start with an agency, then hire once the CRM is structured and the volume justifies a full-time role.
Is OMOSA a Klaviyo agency?
Yes. OMOSA is a Klaviyo Partner. Almost all the brands we work with are on Shopify and Klaviyo: these are the two platforms we know best.
Why Klaviyo rather than Shopify’s emails?
Shopify’s emails are enough to get started. Klaviyo goes further: segmentation, personalisation, and emails that look like your brand. That is what builds repeat purchases.
We already use Klaviyo or another tool. Do you handle the migration?
Yes. Full migration from Mailchimp, Brevo, ActiveCampaign or any other platform, with no loss of data or history. If you're already on Klaviyo, we start with an audit of your existing account.
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