Company lists · Data refreshed September 2026

Top 25 Conversion rate optimization agencies based in France

Name: Conversion rate optimization agencies based in France
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 147 companies tracked

RevenueBase identified 147 conversion rate optimization agencies headquartered in France as of September 2026 and tracks 647 professional contacts across them, including 223 with verified work emails and 36 with mobile numbers. Paris is the largest hub.

This list covers conversion rate optimization agencies headquartered in France, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, how directly it supports the match, and when it was last checked. Data refreshed September 3, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list Match evidence on every row Refreshed Sep 3, 2026 86% judged on-target in blind review

147Companies

647Contacts tracked

223Verified emails

36Mobile numbers

Unlock all 147 companies Free signup · no credit card · 500 free credits

The 25 largest conversion rate optimization agencies based in France

Ranked by team size

Top 25 of 147 conversion rate optimization agencies based in France, ranked by team size, largest first. Data refreshed Sep 3, 2026. Evidence rates how directly each company's own description names conversion rate optimization agencies: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	DigitalisimIndirect evidence	Lyon, France	11-50	42
	“Digitalisim est un groupe d’experts qui œuvrent sans relâche pour vous apporter les derniers technologies du web marketing en lien avec votre secteur d’activité.” Source: company website · checked Sep 3, 2026
2	WEBYNStrong evidence	Paris, France	11-50	40
	“Webyn is the AI co-pilot dedicated to online conversions optimization, offering a complete solution to propel your website to success.” Source: company website · checked Sep 3, 2026
3	BeyableStrong evidence	Paris, France	11-50	36
	“BEYABLE's AI-powered solution suite enables E-Commerce and Retailers to maximize the value of their website traffic- Boost conversion rates - Increased margins - Stock clearance -…” Source: company website · checked Sep 3, 2026
4	Oscar BlackPartial evidence	Paris, France	11-50	31
	“L'agence Oscar Black conçoit et pilote des stratégies d'acquisition et de conversion pour entreprises exigeantes.#agencedigitale #webmarketing #googleads #facebookads…” Source: company website · checked Sep 3, 2026
5	Blue BagelsPartial evidence	Lyon, France	1-10	23
	“E-commerce sales increase only 2 ways: 1) Massive ads spend with lesser conversion.” Source: company website · checked Sep 3, 2026
6	WelyftIndirect evidence	Paris, France	11-50	17
	“Welyft is a data-marketing agency that helps brands deliver an exceptional customer experience through data & experimentation (A/B testing, personalization, user testing, UX…” Source: company website · checked Sep 3, 2026
7	Velcome SEO - Agence SEOIndirect evidence	Toulouse, France	11-50	17
	“Agence conseil en référencement Web et en e-commerce, Velcome SEO accompagne les entreprises dans l’élaboration et la mise en œuvre de stratégies d’acquisition client à travers le…” Source: company website · checked Sep 3, 2026
8	Henkan & PartnersIndirect evidence	Paris, France	11-50	16
	“Henkan & Partners est un cabinet spécialisé en Product Analytics et Expérimentation.” Source: company website · checked Sep 3, 2026
9	Adsrank Expert Google ADSIndirect evidence	Paris, France	11-50	15
	“C’est en associant l’expertise de ses analystes avec la puissance de son algorithme qu’AdsRank vous permet d’optimiser vos campagnes Google Ads, afin d’obtenir le maximum de clics…” Source: company website · checked Sep 3, 2026
10	CÉOSIndirect evidence	Nantes, France	11-50	14
	“Céos is the growth agency for e-commerce.” Source: company website · checked Sep 3, 2026
11	DigitalisedIndirect evidence	Paris, France	11-50	14
	“Chez Digitalised, nous avons l’art de trouver la croissance où elle se trouve.” Source: company website · checked Sep 3, 2026
12	AdenlabIndirect evidence	Paris, France	11-50	13
	“Adenlab est spécialisée dans l’optimisation Analytics, la gestion du trafic & campagnes sponsorisées des marques et e-commerces.#ecommerce #strategiedigitale #google #googleads…” Source: company website · checked Sep 3, 2026
13	ExploseoIndirect evidence	Villers-Semeuse, France	11-50	13
	“Exploseo a été fondée pour les entreprises en quête d’efficience publicitaire, nous sommes passionnés par la performance marketing.” Source: company website · checked Sep 3, 2026
14	PerfmakerPartial evidence	Paris, France	11-50	12
	“Nous aidons les marques à multiplier les opportunités de conversion, vente et lead sur leur site internet, sans aucun développement additionnel.” Source: company website · checked Sep 3, 2026
15	AlticsIndirect evidence	Paris, France	11-50	8
	“Depuis 10 ans Altics teste et optimise les sites marchands.” Source: company website · checked Sep 3, 2026
16	SymetricsIndirect evidence	Bordeaux, France	1-10	7
	“We are Growth Marketing experts.” Source: company website · checked Sep 3, 2026
17	KHOSIIndirect evidence	Nantes, France	1-10	6
	“Notre mission est de faire grandir les organisations et les équipes.” Source: company website · checked Sep 3, 2026
18	FwoptimisationIndirect evidence	Lille, France	1-10	6
	“Fort de nos 13 années d'expérience, nous avons acquis la certitude que le CRO est un gigantesque générateur de valeur accessible à toutes les organisations.” Source: company website · checked Sep 3, 2026
19	InéolabIndirect evidence	Strasbourg, France	1-10	5
	“Vous avez des besoins en SEO (référencement naturel) et CRO (marketing comportemental).” Source: company website · checked Sep 3, 2026
20	API GrowthIndirect evidence	Paris, France	1-10	4
	“Api Growth est une agence spécialisée dans les problématiques d’acquisition de trafic et de mesure de la performance (SEO, SEA, Analytics et CRO).” Source: company website · checked Sep 3, 2026
21	Slice MediaIndirect evidence	Paris, France	1-10	3
	“Après plusieurs millions d'euros dépensés sur différentes plateformes publicitaires, nous avons compris qu'une bonne stratégie d'achat média ne vaut rien sans une bonne stratégie…” Source: company website · checked Sep 3, 2026
22	ClickwayIndirect evidence	Paris, France	1-10	3
	“Clickway est l'agence 360 incoutournable en matière de tendance en web marketing en 2025.” Source: company website · checked Sep 3, 2026
23	Happy TrafficIndirect evidence	Bordeaux, France	1-10	2
	“Happy Traffic vous accompagne dans votre acquisition de trafic à la performance et dans la transformation de vos prospects en clients!” Source: company website · checked Sep 3, 2026
24	Rise UP DigitalIndirect evidence	Lyon, France	1-10	2
	“Notre agence de marketing digital se consacre à aider les entreprises à atteindre leurs objectifs de croissance.” Source: company website · checked Sep 3, 2026
25	GroowwPartial evidence	Paris, France	1-10	1
	“Growing your Conversion and Customer Life Time Value is vital as the cost of media is booming.” Source: company website · checked Sep 3, 2026

Showing 25 of 147 conversion rate optimization agencies based in France

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 223 reachable decision-makers.

Free signup · no credit card

See all 147 companies

Conversion rate optimization agencies based in France at a glance

As of Sep 3, 2026

1-10Median size (employees)

ParisLargest hub · 57 HQs

36Contacts with mobile numbers

Sep 3, 2026Data refreshed

Companies by employee count

1-10

125

11-50

51-200

1,001-5,000

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among conversion rate optimization agencies, so some rows will be adjacent to the category rather than pure plays. The description and evidence rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in France whose own description of what they do matches “conversion rate optimization agencies”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among conversion rate optimization agencies, and records with no verified work email. Companies headquartered outside France are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and an evidence rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 223 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 3, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Conversion rate optimization agencies by metro

Conversion rate optimization agencies in Paris57

Frequently asked

How many conversion rate optimization agencies are there based in France?

RevenueBase identified 147 conversion rate optimization agencies headquartered in France as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Digitalisim, headquartered in Lyon, tops this list with the largest team on record.

Which city has the most conversion rate optimization agencies?

Paris leads with 57 headquartered companies, followed by Lyon (10) and Nantes (7).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 223 verified decision-maker contacts tracked across these 147 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 3, 2026.

Ready to reach these companies? Verified emails and direct dials for all 147 conversion rate optimization agencies based in France. Start with a free account, no credit card.

Get the full list

Related lists

Conversion rate optimization agencies by geography

Browse the directory

Browse: Companies home · All France lists · All Conversion rate optimization agencies lists · New lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.