Evaluate the achievements of a Klaviyo agency
Summary
Before choosing a Klaviyo agency, it is essential to evaluate its achievements and references. This is the best way to check its credibility and determine if it can deliver concrete results for your business.

Why this step is crucial
Every Klaviyo agency highlights its skills. But only by analyzing its completed projects and client testimonials will you be able to measure its true level of expertise and its ability to generate a tangible ROI.
Identify projects led by the agency
Ask to see a project portfolio. Good agencies show:
- concrete use cases (abandoned cart, welcome series, re-engaging dormant customers),
- a variety of sectors (fashion, tech, cosmetics) proving their adaptability,
- examples of successful Klaviyo technical integrations.
➡️ The more documented the projects, the more guarantees you have.
Analyze results obtained
Don't stop at pretty presentations. A good agency must prove its performance with numbers:
- +25% open rate after scenario optimization,
- 2x conversion rate thanks to automation,
- -50% acquisition cost via better-targeted emails.
"Thanks to this Klaviyo agency, our email campaigns generate 40% of our e-commerce revenue." – E-commerce client, fashion sector
Check references and client reviews
Testimonials and client references are essential social proofs. Points to check:
- The reputation of the brands supported,
- The diversity of sectors, a guarantee of flexibility,
- Online client reviews (Google, Trustpilot, etc.).
➡️ The best agencies share detailed case studies and agree to connect you with former clients.
Conclusion and next steps
Evaluating the achievements and references of a Klaviyo agency is an essential step before any collaboration. It is the key to choosing a partner capable of sustainably boosting your email campaigns.
👉 Need a certified Klaviyo agency for proven results? Discover Stellar's support.
L'AUTEUR
Florian POHL
Co-fondateur de Stellar Projects, Florian incarne une double expertise rare : la maîtrise du design technique et une compréhension fine des leviers marketing. Avant de co-fonder l’agence, il a lancé plusieurs marques en ligne à succès, ce qui nourrit aujourd’hui sa capacité à concevoir des sites Shopify à la fois beaux, performants et pensés pour vendre. Chez Stellar, il pilote la création et la technique avec un seul objectif : transformer chaque projet en accélérateur de croissance. Florian est également co-auteur du livre "Créer sa marque à l'ère de l'IA", publié en 2026.
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