Hiring a conversion rate optimization agency usually means paying a monthly retainer for a team to research, test, and improve your store’s funnel. Before signing anything, it helps to know what separates a genuinely useful agency from one that ships a slide deck once a quarter.
What a good conversion rate optimization agency actually delivers
- A structured testing roadmap, not a one-time audit
- Statistically sound A/B tests, not changes shipped on a hunch
- Clear reporting tied to revenue impact, not vanity metrics
- Fast iteration, weeks, not quarters, between test cycles
Questions worth asking before you hire one
Ask how many tests they typically run per month, what percentage of their tests actually win, and how findings get implemented, do they hand you a report, or do they ship the change themselves? That last question matters more than most people realize. A lot of agency engagements stall at the “here’s what we recommend” stage, and the fixes never actually go live.
The agency retainer problem
Traditional CRO agencies typically require $3,000–$10,000+ per month, with meaningful results taking 2–3 months to show up because human teams can only run a handful of tests at a time. That model works for large stores with big budgets and dedicated testing bandwidth, but it prices out a lot of growing Shopify and WooCommerce merchants.
The alternative: an agent that runs continuously
Revvy is built to do the part of CRO agency work that’s genuinely repeatable, finding friction, running tests, shipping the winner, without the retainer or the multi-week reporting cycle. It doesn’t replace strategic thinking about your brand, but for the mechanical work of finding and fixing conversion leaks, it runs around the clock instead of once a sprint.
Ultimately, the right agency relationship should feel like a genuine extension of your team’s thinking about the store, not a vendor you check in with quarterly. If it consistently feels transactional rather than collaborative, that’s worth addressing directly rather than assuming it’s simply how these engagements work.
How to tell if an agency relationship is working
Beyond raw conversion numbers, watch whether the agency is proactively surfacing new hypotheses as your store evolves, or simply running through an initial list of ideas and then going quiet. A relationship that stops generating new test ideas after the first few months has likely plateaued, worth raising directly rather than assuming it will self-correct.
Transitioning off an agency engagement
When an engagement ends, make sure you retain access to test history, learnings documentation, and any custom tooling configuration built during the engagement. Not just the final report. This protects the value of the work even after the relationship ends, and prevents starting from zero with the next provider or tool you choose.
How agencies typically source their testing ideas
The better agencies build hypotheses from your own store’s behavioral data, heatmaps, session recordings, funnel drop-off points, rather than applying a generic playbook of “best practices” pulled from unrelated stores. Ask an agency directly how they generate test ideas; “industry best practices” as the only answer is a warning sign that they’re not actually analyzing your specific funnel.
What to include in the contract itself
Beyond price and timeline, a solid CRO agency contract should specify who owns the testing data and insights after the engagement ends, what tools are used (so you’re not locked into proprietary software you lose access to), and a clear definition of what counts as a “completed” test versus one still running. Vague contracts create disputes later, usually right when you’re deciding whether to renew.
Evaluating agency case studies critically
When an agency shows you a past client’s results, ask what that client’s starting conversion rate and traffic volume were. A store starting from a genuinely broken funnel (a 0.5% conversion rate) has far more room for dramatic percentage gains than an already well-optimized store at 3.5%. A 400% improvement claim means something very different depending on the baseline.
What a reasonable onboarding process looks like
Expect an initial audit period (typically 2–4 weeks) before any testing begins, during which the agency should be reviewing your analytics setup, current funnel performance, and competitive positioning. An agency proposing to start testing in the first week, before understanding your baseline, is skipping a step that materially affects whether their tests are well-targeted.
In-house team vs. agency: how to decide
An in-house hire makes sense once you have enough traffic and testing volume to keep one or two people fully occupied, usually a threshold most mid-size and larger stores reach before smaller ones do. Below that volume, an agency or an autonomous tool is more cost-effective than a full-time salary, because there simply isn’t enough testing surface area to justify dedicated headcount.
How agency pricing structures typically work
Most agencies price either as a flat monthly retainer, a percentage of the revenue lift they generate, or a hybrid of both. Percentage-of-lift models sound appealing because they align incentives, but they usually come with a higher base fee to offset the agency’s risk, and defining what counts as “lift” (versus organic growth or seasonality) is often contentious.
Common questions about CRO agencies
How long is a typical CRO agency contract?
Most require a minimum engagement of 3–6 months, since meaningful testing cycles take time to produce statistically valid results.
See what Revvy finds in your own store, no card required.
What happens to my store’s test history if I switch agencies or cancel?
This varies significantly by contract, ask specifically before signing, since some agencies retain testing data and insights rather than handing them over.
Can a CRO agency guarantee results?
Be skeptical of any guarantee stated as a fixed percentage increase before they’ve reviewed your specific store, legitimate agencies typically avoid blanket guarantees because results depend heavily on your starting point.
For a broader look at CRO fundamentals beyond agency work specifically, Shopify’s CRO primer is a solid starting reference.
Whichever conversion rate optimization agency you consider, judge them on shipped fixes, not slide decks.
Related reading
- How to Hire a CRO Consultant for Ecommerce
- How Much Does CRO Cost? A Pricing Breakdown
- CRO Case Studies: What Real Shopify Wins Actually Look Like
Get agency-style testing without the monthly fee.
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