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Strategy5 min read

How to switch CRO agencies without losing test history

Most switches keep the logins and lose the lessons. Here's what to take with you, and what the first 30 days should look like.

Fabian GmeindlCo-Founder, DRIP Agency
3 Jun 2026Published
This article is part of The Complete Guide to Conversion Rate Optimization

Before the new agency launches a single test, move your test history over: the ideas, the reasons behind them, the results, the tracking setup and who owns the building. A handover should protect what you learned, not just hand over account access.

Contents
  1. 01Why do agency switches lose so much?
  2. 02What should you get from your old agency?
  3. 03What should the first 30 days look like?
  4. 04Can you keep using old test results?
  5. 05Where does DRIP fit?
  6. 06Where can you read more?
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01Why do agency switches lose so much?

Because the old agency hands over dashboards, not the reasons behind the tests.

You get the logins and a folder of screenshots. What you don't get is why a test was run, how solid the result was, and what went wrong in the build. Without that, your new agency either retests old ideas or throws out good ones.

A good handover keeps two things: the data, and the memory of what it meant.

02What should you get from your old agency?

The test log, the tracking map, the backlog, and the code and QA notes. Ask for all four in writing before the contract ends.
AssetWhy it mattersMinimum handover
Test logStops you retesting the same idea blindHypothesis, audience, dates, traffic, result, decision
Tracking mapKeeps your numbers comparableEvents, revenue logic, consent mode, known issues
BacklogKeeps the momentumRanked ideas with the reason and evidence for each
Code and QA notesPrevents broken rolloutsVariant code, screenshots, QA findings, rollback notes
Pro Tip
Ask for the losing and inconclusive tests too. They tell you what your visitors don't care about, and that saves the next agency months.

03What should the first 30 days look like?

Fix the measurement first, then rebuild the pace. Don't launch a big new program until access, tracking and past results are clear.
  • Week 1: check access, tracking, the testing tool and the test log.
  • Week 2: sum up what past tests taught you and clean up the backlog.
  • Week 3: agree on QA standards and launch the first low-risk tests.
  • Week 4: set the new prioritization rhythm and review the measurement.

04Can you keep using old test results?

Yes, if you know how each metric was defined and how the test was built. Treat old results as evidence with a confidence level, not as the truth.

A result is only as good as the setup behind it. If the old agency stopped tests early or changed the goal halfway through, mark the result as weak and test it again when it matters. If the setup was clean, keep it and build on it.

If you're not sure how to judge an old result, the peeking problem is a good place to start.

05Where does DRIP fit?

We take over from programs that tested too slowly or tested whatever someone liked, for online shops from €100k a month.

Our first job after a switch is simple: keep what's useful, drop what isn't reliable, and get tests running again without losing measurement discipline. Your old test log is part of our research. What lost tells us as much about your visitors as what won.

From there we run Prediction-Based Experimentation. Every new idea gets a Likelihood to Win from Apex by DRIP, the testing tool inside DRIP, before it's built. More than 50% of our A/B tests win.

Full-service guarantee
At least 10% more revenue in under six months, or month seven onward is free.

06Where can you read more?

How a switch to DRIP works, how to choose the next partner, and independent reviews of DRIP.
  • DRIP: switch CRO agency, how a switch to DRIP works.
  • CRO agency selection criteria, a checklist for choosing the next partner.
  • Clutch: DRIP profile, client reviews of DRIP.
Article brief
5min read
6sections
Strategy
What this covers
  1. 01Why do agency switches lose so much?
  2. 02What should you get from your old agency?
  3. 03What should the first 30 days look like?
  4. 04Can you keep using old test results?
Next step

Explore the CRO License

See how DRIP runs parallel experimentation programs for sustainable revenue growth.

Book a free call
Proof point

Read the KoRo case study

€2.5M additional revenue in 6 months after implementing structured CRO.

Read the KoRo case study

Recommended Next Step

Explore the CRO License

See how DRIP runs parallel experimentation programs for sustainable revenue growth.

Read the KoRo case study

€2.5M additional revenue in 6 months after implementing structured CRO.

11 · Common questions

Frequently Asked Questions.

3 questions · 1 honest answer each

The test log with hypotheses, screenshots and variant code, your tracking definitions, QA notes, results, rollout decisions and the current backlog. Ask for losing and inconclusive tests too.

Yes, if you know how each metric was defined and how the test was built. Treat old results as evidence with a confidence level, not as the truth.

Often within weeks. The first step should still be a check of your tracking, your past results, the quality of the backlog and access to build tests.

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