Growth Marketing Agency vs Performance Marketing Agency: What Startups Should Actually Hire

A performance marketing agency runs paid acquisition channels such as Google Ads and Meta Ads and is judged on cost per result. A growth marketing agency works across the whole funnel, including acquisition, activation, retention and referral, and runs experiments to improve whichever stage is the bottleneck. Startups with a working product and a leaky funnel usually benefit from growth work. Startups whose funnel converts well but lacks traffic usually need performance marketing.

Key takeaways

• Performance marketing = paid channels, optimised to a cost per lead or acquisition.
• Growth marketing = experiments across acquisition, activation, retention and referral.
• Find your bottleneck first: if visitors don't convert or users don't stick, more traffic won't fix it.
• Many agencies use both labels. Judge them by what they propose to do in the first 90 days.
• Either way, insist on owning your ad accounts and data.

The difference in one table

Find your bottleneck first

Map your funnel with real numbers for the last 30–90 days:

1. Visitors to your site or landing pages
2. Conversion to lead or signup
3. Activation: users who reach the first meaningful outcome
4. Conversion to paying customer
5. Retention after 1, 3 and 6 months

Then compare each step with what you'd expect. If 2% of visitors sign up but only 10% of signups ever activate, buying more traffic multiplies a broken onboarding. That's a growth problem. If visitors convert well and customers stay, but there just aren't enough visitors, that's a performance marketing problem.

Not sure where your funnel leaks? We'll walk through your numbers on a free strategy call and tell you which kind of help you need, even if it isn't ours. Book it.

Related: If your bottleneck is the page rather than the traffic, start with our guide to what makes a website high-converting; it's often cheaper than buying more clicks.

What good performance marketing looks like

• Tracking that counts real outcomes and feeds them back to the ad platforms
• Tight targeting on intent: phrase and exact match keywords, negative keyword lists, clear audience definitions
• Landing pages matched to each campaign, not everything sent to the homepage
• Decisions based on cost per qualified lead, with weekly lead-quality feedback from sales
• Clear stopping rules: when to cut a campaign, when to scale it

What good growth marketing looks like

• A prioritised experiment backlog, scored on expected impact and effort
• One bottleneck at a time. Fixing activation before scaling acquisition
• Proper experiment hygiene: a hypothesis, a success metric and enough sample size to read the result
• Cross-functional work with product and engineering, because many growth wins are product changes such as onboarding steps, pricing pages and in-app prompts

A growth agency that only runs ads is a performance agency with a different name.

If the bottleneck is conversion, start with our SaaS landing page blueprint. If it's budget allocation, see how much to spend on marketing after raising a round.

How they're paid

Both commonly charge monthly retainers. Performance agencies may also charge a percentage of ad spend. Growth agencies sometimes add a performance component tied to a funnel metric.

Whatever the model, make sure the incentive matches what you want. A percentage of ad spend rewards spending more. A bonus on signups rewards signups, including ones that never activate, unless you define the metric carefully.

Questions to ask either kind of agency

• What would you do in the first 30 days, specifically?
• Which metric will you be accountable for, and how will you measure it?
• What do you need from our team to succeed?
• Whose name will the ad and analytics accounts be in? (It should be yours.)
• Tell us about an experiment or campaign that failed and what you changed.

Frequently asked questions

What does a growth marketing agency do?

A growth marketing agency runs experiments across a company's whole funnel, including acquisition, activation, retention and referral, to find and fix the stage that most limits growth. It typically works closely with product and engineering teams.

What is the difference between growth marketing and performance marketing?

Performance marketing focuses on paid acquisition channels and is measured by cost per result. Growth marketing covers the full customer lifecycle and is measured by improvements in conversion and retention at each funnel stage.

Should a startup hire a growth marketing agency?

If the startup already has traffic or signups but struggles to convert or retain them, growth work is usually the better investment. If the funnel converts well but there isn't enough traffic, performance marketing is usually the better fit.

Is a growth marketing agency worth it for a seed-stage startup?

It can be, if there's enough traffic to run meaningful experiments. With very little traffic, experiments can't reach reliable results, and founders often learn more from talking to users directly.

Can one agency do both growth and performance marketing?

Some can. Check by asking what they'd do in the first 90 days. If every item is a paid campaign, it's a performance agency; if the plan includes onboarding, pricing or retention changes, it's genuinely doing growth.

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Funnel converts and you need more of the right traffic? That's what we do: Google Ads, Meta Ads, SEO and AI search, all measured in qualified leads.

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