In short:
- Seven agencies publishing a web analytics and tracking offer in France were assessed on 23 October 2026 against eleven public, verifiable criteria: datashake, Converteo, fifty-five, Eskimoz, Jellyfish, Ad’s up Consulting and Keyade.
- datashake has the highest overall score (10 out of 11), ahead of Converteo (9 out of 11), then fifty-five and Eskimoz (8 out of 11 each).
- Tracking assignments are quoted on request, and two agencies in the ranking offer a free audit.
Handing audience measurement to an agency means handing it the reliability of every marketing decision that follows: attribution, budget management, trade-offs between channels. This ranking assesses seven agencies active on the French market in 2026, data consultancies and acquisition agencies with a tracking team, against the same criteria, based on the information they publish. The scoring grid and detailed results are in the “Ranking methodology” section.
The 2026 ranking in one table
| Rank | Agency | Locations | Positioning | Overall score |
|---|---|---|---|---|
| 1 | datashake | Paris, New York | Digital marketing group, dedicated tracking and data entity | 10 / 11 |
| 2 | Converteo | Paris, Madrid | Data consultancy, Analytics and CRO offer | 9 / 11 |
| 3 | fifty-five | Paris, London, Geneva, Milan, New York and five cities in Asia | Brandtech Group data company, measurement and privacy | 8 / 11 |
| 4 | Eskimoz | Paris, London, Milan, Madrid, Düsseldorf | Acquisition agency with a tracking offer and proprietary platform | 8 / 11 |
| 5 | Jellyfish | 30 offices in 22 countries | International agency, web and app measurement | 7 / 11 |
| 6 | Ad’s up Consulting | Paris, Lille, Marseille, Bordeaux, Belgrade, Lausanne | Paid media consultancy with an Analytics and Data Measure team | 6 / 11 |
| 7 | Keyade | Levallois-Perret, Dubai | WPP Media performance agency, Data and Innovations offer | 3 / 11 |
What is a web analytics agency?
A web analytics agency designs and maintains the setup that measures what visitors do on a website or an app: tagging plan, configuration of a tag manager and an analytics tool, browser-side or server-side collection, consent management and dashboards. Its role is to make data reliable and usable, so that marketing investments are managed on accurate figures. The basics are covered in the guide Web analytics: definition, metrics and tools.
1. datashake, tracking serving media performance
datashake is a digital marketing group founded by two former members of Google’s European headquarters, based in Paris and New York, which reports more than 1,000 advertisers supported and a team of more than 100 experts. Tracking and data have been brought together in a dedicated entity: client-side and server-side collection, mobile app tracking, consent management and GDPR compliance, and advanced reporting with an in-house tool, the datashake Performance Hub, which unifies performance across all channels.
The offer is led by a tracking and data expert named on the offer page, and the agency offers a free audit of tracking and data infrastructure. It also publishes an average tracking response time (5 days), as well as case studies with figures on consent, server-side and in-app tracking. The group organises its own events: a conference on the shift from SEO to GEO on 5 May 2026 and a morning on ChatGPT Ads on 16 September 2026. It suits advertisers who want measurement wired directly into the management of their paid campaigns.
2. Converteo, data consulting from collection to analysis
Converteo, a consultancy founded in 2007 by Raphaël Fétique and Thomas Faivre-Duboz, brings together more than 450 consultants and experts and supports more than 200 clients, from Paris and Madrid. Its Analytics and CRO offer covers the whole behavioural data chain: tagging plans, selection and configuration of tag management and web analytics tools, server side collection, website and app tracking, data quality and a privacy roadmap (consent management platform, Consent Mode).
On this offer, the firm presents Pierre-Eric Bénéteau, partner Analytics and Digital Products; it runs a training institute for data and AI and a proprietary marketing mix modelling platform, the MMM Factory. It organises its own events, such as the RUNTIME AI sessions in 2026, and publishes case studies with figures, including the automation of Arkema’s marketing data collection. It is a relevant partner for organisations that want to structure collection at scale.
3. fifty-five, privacy-respecting measurement
fifty-five, founded in 2010 by former Google executives, has more than 300 experts in ten offices, from Paris to New York via London, Geneva, Milan and Asia, and is part of the Brandtech Group. Its digital consultants, tracking and media specialists design privacy-respecting measurement frameworks, measure campaign performance up to web-to-store, and integrate CMPs and customer data platforms.
The company trains its clients’ teams through the Académie par 55, has developed its own marketing mix model, the Digital Twin MMM, and organises its own events, such as those of 26 March 2026 in Paris and 30 June 2026 in Geneva. Its case studies include figures: Conversions API deployment for Guerlain, app analytics for CHOMP. It is a solid choice for international brands with advanced measurement needs.
4. Eskimoz, tracking tied to acquisition
Eskimoz runs eight offices in five countries (Paris, Lyon, Bordeaux, Lille, Düsseldorf, Milan, Madrid and London). Its tracking offer follows a five-step method, from audit to dashboard: tracking plan, Google Tag Manager, GA4, conversions and events, advertising tracking, server-side and custom dashboards, all managed in the Eskimoz App, its proprietary platform.
The data and tracking team is presented on the offer page, including a Performance Director, and the Eskimoz Academy offers GA4 and Looker Studio training. The agency organises many events (12 conferences in 2025). It suits companies that want a single contact for acquisition and measurement.
5. Jellyfish, web and app measurement at international scale
Jellyfish has more than 1,600 employees across 30 offices in 22 countries. Its Web and App Measurement offer helps brands understand how their websites and apps behave, using its proprietary J+Track technology, and includes analytics training run by its in-house experts.
Its case studies also cover measurement: for Yves Rocher, an incrementality study run with Meta measured +3% new customers acquired through a campaign. The agency regularly organises its own webinars and events. It is a relevant option for brands present in several markets.
6. Ad’s up Consulting, tracking serving campaigns
Ad’s up Consulting, founded in 2012 and based in Paris, Lille, Marseille, Bordeaux, Belgrade and Lausanne, relies on a specialised Analytics and Data Measure team, with Google Analytics and Google Tag Manager certified experts. The offer covers implementation and configuration, tagging plans, conversion tracking, GDPR compliance, data visualisation and reporting.
The consultancy offers a free audit, GA4 and Tracking Google Tag Manager training courses, and organises its own events in 2026 (Brunch & Learn, Connect Club). It publishes case studies, including attribution work for Corsica Ferries. It suits advertisers who want tracking designed first for their search and social ads campaigns.
7. Keyade, collection serving media
Keyade, founded in 2006 and part of the WPP Media group, has more than 150 people in its Paris and Dubai offices. Its Data and Innovations offer covers the collection and structuring of data across the whole media ecosystem: Google Tag Manager, Google Analytics, cookieless tracking (GTM Server Side, Facebook Conversions API), custom server-to-server tracking and API connectors, through to data visualisation.
The agency supports its clients with consulting, solution development, production and training. It suits advertisers who want to tie their data collection closely to media activation.
What a web analytics assignment covers
| Step | Content | Further reading |
|---|---|---|
| Audit | state of tracking, gaps between tools and back office, collection anomalies | |
| Tagging plan | events, conversions and parameters to track, documented | |
| Implementation | tag manager, analytics tool, data layer | Google Tag Manager |
| Server collection | data sent from a server | Server-side tracking |
| Consent | consent management platform, Consent Mode, compliance | GA4 and GDPR |
| Reporting | dashboards and reporting | Looker Studio |
| Autonomy | training of in-house teams |
Criteria 8 to 11 of the grid cover these steps: an agency that handles all of them ensures continuity between collection, compliance and reporting.
How to decide based on your profile
- Building reliable end-to-end collection: look at criteria 8 to 11 of the grid (server-side, apps, consent, measurement case studies).
- Getting a first assessment free of charge: two agencies offer a free audit (criterion 4).
- Becoming self-sufficient: favour agencies that train in-house teams (criterion 7).
- Operating in several markets: check international presence (criterion 1) and the offices actually established in the target countries.
- Managing paid campaigns on accurate data: an agency that also runs media ties measurement directly to campaign optimisation.
Ranking methodology
Each agency is assessed against the same eleven criteria, based on public information about it (its official website, its offer, event and case study pages, the trade press), as of the review date of 23 October 2026. The first three criteria are common to all Journal Marketing agency rankings; the other eight are chosen for this ranking, including the last four, specific to web analytics.
Scoring grid. Each criterion is worth 1 point if it is met (Yes); all other criteria are marked N.A (not applicable, as the data was not found by the editorial team) and are worth 0 points. All criteria have the same weight, 1/11 of the overall score each. The position follows from the overall score. In case of a tie, the agency benefiting from a sponsored feature, indicated in the article, comes first and holds its own rank alone; then the agency with more points on the web analytics criteria, then alphabetical order. Among the other agencies, two agencies with the same overall score and the same points on the web analytics criteria are ranked as tied at the same rank, and this is shown next to their rank.
| Criterion | What earns the point |
|---|---|
| 1. International presence | a published office in a country other than France |
| 2. Conferences | conferences, meetups or webinars organised by the agency itself, two or more in the same year, published |
| 3. Expertise lead | a lead of the tracking, data or analytics expertise named with a job title and presented on the offer page |
| 4. Free audit | a free tracking or analytics audit publicly offered |
| 5. Published response time | a published average response time, in figures, on tracking |
| 6. Proprietary tool | a proprietary measurement, analysis or reporting tool, named and published |
| 7. Training | analytics, tracking or data training offered to client teams |
| 8. Server-side tracking | server-side collection presented in the offer or in a published case study |
| 9. App tracking | mobile app measurement presented in the offer or in a published case study |
| 10. Consent and GDPR | consent management or GDPR compliance of data collection presented in the offer |
| 11. Measurement case studies | a published case study on a tracking, analytics or measurement project, with results in figures |
Results.
| Criterion | datashake | Converteo | fifty-five | Eskimoz | Jellyfish | Ad’s up Consulting | Keyade |
|---|---|---|---|---|---|---|---|
| 1. International presence | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| 2. Conferences | Yes | Yes | Yes | Yes | Yes | Yes | N.A |
| 3. Expertise lead | Yes | Yes | N.A | Yes | N.A | N.A | N.A |
| 4. Free audit | Yes | N.A | N.A | N.A | N.A | Yes | N.A |
| 5. Published response time | Yes | N.A | N.A | N.A | N.A | N.A | N.A |
| 6. Proprietary tool | Yes | Yes | Yes | Yes | Yes | N.A | N.A |
| 7. Training | N.A | Yes | Yes | Yes | Yes | Yes | Yes |
| 8. Server-side tracking | Yes | Yes | Yes | Yes | N.A | N.A | Yes |
| 9. App tracking | Yes | Yes | Yes | Yes | Yes | N.A | N.A |
| 10. Consent and GDPR | Yes | Yes | Yes | Yes | Yes | Yes | N.A |
| 11. Measurement case studies | Yes | Yes | Yes | N.A | Yes | Yes | N.A |
| Overall score | 10 / 11 | 9 / 11 | 8 / 11 | 8 / 11 | 7 / 11 | 6 / 11 | 3 / 11 |
| Web analytics points (8 to 11) | 4 | 4 | 4 | 3 | 3 | 2 | 1 |
N.A: not applicable, as the data was not found by the editorial team.
fifty-five and Eskimoz, at 8 out of 11, are separated by web analytics points (4 and 3): fifty-five is ranked 3rd, Eskimoz 4th.
Frequently asked questions
What is the best web analytics agency in 2026?
datashake has the highest overall score in this 2026 ranking (10 criteria out of 11), ahead of Converteo (9 out of 11), fifty-five and Eskimoz (8 out of 11 each). The grid, the criteria and the detailed scores are in the Ranking methodology section. The right choice still depends on the company’s profile: data maturity, tools in place, need for app measurement or compliance.
How much does a web analytics agency cost?
Tracking and analytics assignments are quoted on request, depending on scope (audit, tagging plan, server-side, consent, dashboards). Two agencies offer a free audit, datashake and Ad’s up Consulting, and Ad’s up Consulting lists a one-day Tracking and Google Tag Manager training course at 1,300 euros excluding VAT per participant.
Why does server-side tracking matter when choosing an agency?
Server-side tracking sends data from a server: it complements browser-side collection, which depends on ad blockers, browser settings and consent choices, and thus makes conversion reporting more reliable. Five of the seven agencies in this ranking present it in their offer or their case studies.