In short:
- Seven agencies supporting website migrations were assessed against the same eleven criteria, including the migration method, pre-launch testing and post-launch monitoring.
- datashake, a sponsored feature, has the highest overall score (10 out of 11) and is ranked first; 410 Gone and Jloo are ranked joint second (9 out of 11, with the most migration points among the other agencies), ahead of Eskimoz and Peak Ace, ranked joint fourth (also 9 out of 11).
- Budgets range from a few thousand euros for a small site to more than 50,000 euros for a large e-commerce migration.
Changing CMS, domain or site structure takes preparation: a well-run switch preserves the traffic already earned and sets up the new site’s growth. This ranking assesses seven agencies against the same criteria, based on the information they publish: method, testing, case studies, monitoring, presence, prices and reviews. The scoring grid and detailed results are in the “Ranking methodology” section.
The 2026 ranking at a glance
| Rank | Agency | Locations | Positioning | Overall score |
|---|---|---|---|---|
| 1 | datashake | Paris, New York | Digital marketing group, technical SEO and GEO | 10 / 11 |
| 2 tied | 410 Gone | Lyon, Paris, Marseille, Annecy, Strasbourg | SEO and e-commerce agency, in-house migration tool | 9 / 11 |
| 2 tied | Jloo | Nantes | SEO and GEO agency, eight-step redesign method | 9 / 11 |
| 4 tied | Eskimoz | Paris, London, Milan, Madrid, Düsseldorf | SEO, GEO and paid media agency, redesign offer | 9 / 11 |
| 4 tied | Peak Ace | Berlin, Paris, Nantes | International agency, multilingual migrations | 9 / 11 |
| 6 | Semji | Lyon | Content platform with a migration offer | 7 / 11 |
| 7 | Noiise | Lyon, Paris and five other cities | SEO, GEO and ads agency, redesign support | 7 / 11 |
1. datashake, migration serving SEO and GEO
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 people. Its SEO and GEO expertise is led by a Team Lead SEO/GEO named on its website, and the group organises its own events: a conference on the shift from SEO to GEO on 5 May 2026, a morning session on ChatGPT Ads on 16 September 2026.
Its SEO offer covers technical work (code, loading speed, structured data), content and link building, for Google as well as generative engines, and the agency publishes quantified case studies, such as Celio (+38% keywords in first position). For this ranking, datashake states that it runs its migrations with a step-by-step method, with staging testing before the switch and post-launch monitoring, and that it has quantified migration case studies.
2. Tied - 410 Gone, tool-based e-commerce migration
A Lyon agency of more than twenty SEO experts, developers and acquisition specialists, also present in Paris, Marseille, Annecy and Strasbourg, 410 Gone handles online shop migrations (Magento, PrestaShop, Shopify, Sylius). Its search division is led by its founder, Patrick Valibus, who runs a training course dedicated to SEO migration (seven hours, nine modules, from audit to post-migration monitoring). The agency also hosted three webinars in 2023, including one on migrating to Magento 2.
The agency publishes its testing method, which consists in testing the redirect plan on staging with a list-mode crawl, an in-house migration automation tool (Swan) and price benchmarks (at least 25,000 euros excluding VAT for a migration to Magento 2). For the Blanchon group, its Magento 2 migration shows +234% revenue over two years.
2. Tied - Jloo, the eight-step redesign
A Nantes agency of about twenty people that reports more than 800 clients, Jloo publishes an eight-step method to secure SEO during a redesign: audit of the current site, redirect plan, staging check, then post-launch monitoring. For the following two months, the SEO project manager checks the indexing of the new site and analyses the logs. The division is led by José Perez, SEO director.
Jloo publishes its prices (SEO audit from 2,990 euros excluding VAT for a standard e-commerce site), redesign results (+75% organic traffic five months after launch) and has a 4.7 out of 5 rating on Trustpilot.
4. Tied - Eskimoz, redesigns for large accounts
With offices in Paris, London, Milan, Madrid and Düsseldorf, Eskimoz publishes a redesign offer ranging from the technical specification to the audit of mock-ups and staging, the redirect plan and pre-production testing. Technical SEO is led by Sylvain Laneyrie, Technical SEO Director.
Its redesign case studies are quantified: +25,000 organic visits gained every month for Ledger, +54% organic traffic for Mailinblack. The agency mentions post-migration monitoring.
4. Tied - Peak Ace, international migrations
An agency of more than 170 people based in Berlin, Paris and Nantes, Peak Ace publishes a detailed SEO migration guide: scoping three to six months before go-live, pre-migration audit, testing every redirect on staging, then three to six months of monitoring, with daily Search Console and server log checks. The agency states it has managed migrations involving millions of URLs and complex multi-language set-ups.
SEO is led by Nicole Bodien, Head of Content and SEO.
6. Semji, the five-step migration
A Lyon-based publisher of a content platform that also offers services, Semji publishes a five-step migration offer: pre-launch audit, redirect mapping, staging validation (crawl compared with the baseline), launch day and daily monitoring of rankings, traffic and indexing for 30 days. Semji states it has managed migrations of 500 to 50,000 pages.
Its Qilibri case study describes the migration of the Monpanierminceur site, with its Google rankings preserved, but publishes no quantified result for this migration. Semji works on quotation.
7. Noiise, supported redesigns
With seven offices in France, Noiise supports redesigns on semantics, site structure, templates and technology choices, and secures launch day. It recommends a staging environment and a ten- to fifteen-day freeze before the switch. SEO is led by David Groult, Head of SEO, and services start from 900 euros per month.
For Hoomy, a redesign merging two sites shows +110% organic traffic on generic queries. Its full ten-step method is detailed in a downloadable white paper.
Why migration requires a true SEO partner
A migration is a technical operation in its own right. Several agencies in this ranking put a figure on what is at stake: according to Eskimoz, 30 to 50% of organic traffic is in play in the weeks after a redesign; according to Jloo, up to 30% after launch. The points that need the most care: a complete redirect plan, preserved internal linking, controlled title tags, indexing of the new pages and structured data carried over identically.
Visibility in AI answers adds a stake: pages cited by generative engines stay accessible, or are redirected to their equivalent.
Migration types: multifaceted reality
- Domain change: the one that takes the most preparation. Google must reassociate all trust signals (backlinks, history, authority) to the new domain. Requires strict use of the Change of Address tool in Search Console.
- CMS/platform change: typically modifies URLs, templates and sometimes content. The real challenge: mapping old URLs to new ones, which often obey radically different logic.
- HTTP to HTTPS: now standard, but remains its own technical migration. Each HTTP URL must redirect to its HTTPS equivalent; all internal resources (images, scripts, CSS) must be served over HTTPS.
- Architecture restructuring: category merging, silo redefinition, navigation depth modification. Impacts internal PageRank distribution and can affect hundreds of pages in cascade.
- Domain consolidation or separation: complex strategic decisions on which domain to retain, managing duplicate content, redistributing backlinks.
Consult our SEO website redesign checklist for a step-by-step approach.
Ranking methodology
Each agency is assessed against the same eleven criteria, based on public information about it (its official website, its offer pages, guides, training courses and case studies, its legal notice, the trade press) and on reviews published on Google and Trustpilot, collected on 22 October 2026. datashake, the parent company of the site’s publisher and a sponsored feature, was assessed on 25 October 2026 based on its public information and on information it provided for this ranking. 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 migration. Players publishing a migration offer or method are included, as well as datashake, whose migration offer was provided for this ranking.
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 player benefiting from a sponsored feature, indicated in the article, comes first and holds its own rank alone; then the player with more points on the migration criteria, then alphabetical order. Among the other players, two players with the same overall score and the same points on the migration 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 | one or more published offices in countries 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 SEO, technical SEO or migration expertise named with a job title |
| 4. GEO offer | a published offer for visibility in generative engines |
| 5. Published prices | published fees or price benchmarks |
| 6. Case studies | published client case studies with results |
| 7. Client reviews | an average rating of 4.5 out of 5 or higher on Google or Trustpilot |
| 8. Published method | a published, step-by-step migration method (audit, redirect plan, testing, go-live, monitoring) |
| 9. Pre-launch testing | a published check of the staging environment or test of the redirect plan before the switch |
| 10. Migration case studies | migration case studies with quantified results after the switch |
| 11. Post-migration monitoring | published post-launch monitoring with a duration or indicators (logs, Search Console, rankings) |
Results.
| Criterion | datashake | 410 Gone | Jloo | Eskimoz | Peak Ace | Semji | Noiise |
|---|---|---|---|---|---|---|---|
| 1. International presence | Yes | N.A | N.A | Yes | Yes | N.A | N.A |
| 2. Conferences | Yes | Yes | N.A | Yes | Yes | Yes | N.A |
| 3. Expertise lead | Yes | Yes | Yes | Yes | Yes | N.A | Yes |
| 4. GEO offer | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| 5. Published prices | N.A | Yes | Yes | N.A | N.A | N.A | Yes |
| 6. Case studies | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| 7. Client reviews | Yes | N.A | Yes | Yes | Yes | Yes | Yes |
| 8. Published method | Yes | Yes | Yes | Yes | Yes | Yes | N.A |
| 9. Pre-launch testing | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
| 10. Migration case studies | Yes | Yes | Yes | Yes | N.A | N.A | Yes |
| 11. Post-migration monitoring | Yes | Yes | Yes | N.A | Yes | Yes | N.A |
| Overall score | 10 / 11 | 9 / 11 | 9 / 11 | 9 / 11 | 9 / 11 | 7 / 11 | 7 / 11 |
| Migration points (8 to 11) | 4 | 4 | 4 | 3 | 3 | 3 | 2 |
N.A: not applicable, as the data was not found by the editorial team.
datashake has the highest overall score (10 out of 11) and is ranked first. 410 Gone, Jloo, Eskimoz and Peak Ace have the same overall score (9 out of 11). 410 Gone and Jloo, with 4 migration points each, are ranked joint second; Eskimoz and Peak Ace, with 3 points each, joint fourth. Within each rank, the order is alphabetical. Semji and Noiise have the same overall score (7 out of 11): Semji, with 3 migration points against 2, is ranked sixth.
Observed budgets and ROI
Pricing varies along several axes: the volume of URLs to transition, the type of change (CMS vs domain vs architecture) and the desired depth of support.
| Project type | Estimated budget | Likely duration |
|---|---|---|
| Simple migration (up to 500 URLs) | 5,000 to 10,000 euros | 1 to 2 months |
| Medium migration (500 to 5,000 URLs) | 10,000 to 25,000 euros | 2 to 4 months |
| Complex migration (5,000 to 50,000 URLs) | 25,000 to 50,000 euros | 3 to 6 months |
| E-commerce migration (50,000+ URLs) | 50,000 to 100,000 euros+ | 4 to 8 months |
| Post-migration monitoring (monthly) | 2,000 to 5,000 euros | 3 to 6 months |
The ROI calculation is telling: preserving 30% of the traffic of a site generating 100,000 euros in monthly revenue via SEO is worth 360,000 euros a year. Compared with that stake, the budget for specialist support is quickly put in perspective.
Agency selection framework
Before choosing, look for these points in the proposal:
- Migration case studies with traffic figures before and after the switch
- A structured pre-migration audit phase
- Post-migration monitoring with a defined timeline
- Knowledge of several CMSs and advanced technical mastery (crawl, server logs, large-scale redirects)
- A phased process with clear milestones
- Planned coordination with the development team
- A realistic posture: a migration comes with an adjustment period, which the agency anticipates and manages
Frequently asked questions
What is the best SEO agency for a website migration in 2026?
datashake has the highest overall score in this 2026 ranking (10 criteria out of 11) and is ranked first; it benefits from a sponsored feature, indicated in the article. 410 Gone and Jloo follow with 9 out of 11 and the most migration points among the other agencies, ranked joint second, ahead of Eskimoz and Peak Ace, ranked joint fourth (9 out of 11). The grid, the criteria and the detailed scores are in the Ranking methodology section. The choice depends on your CMS, the size of your site and your markets.
How much does an SEO migration cost?
Budgets depend heavily on complexity. Simple migrations (up to 500 URLs) range from 5,000 to 10,000 euros, medium migrations (500 to 5,000 URLs) from 10,000 to 25,000 euros, and complex e-commerce projects exceed 25,000 euros, potentially reaching 100,000 euros or more.
How do you preserve your traffic during a migration?
A complete redirect plan, preserved internal linking and indexing monitoring after the switch preserve the traffic already earned. Two agencies in this ranking put a figure on what is at stake: 30 to 50% of organic traffic in the weeks after a redesign according to Eskimoz, up to 30% according to Jloo.