What CRO Agencies Actually Deliver (and What They Charge)
A CRO agency engagement typically starts with a kick-off call and a discovery phase. You fill out a brief. They review your analytics, your ad data, and your current page. Two to four weeks later, you receive a recommendations document.
Implementation is usually separate. You either implement the changes yourself or pay the agency extra to do it. A/B tests require statistical significance, which means 4 to 8 weeks of traffic before you can measure the impact of any single change.
The cost for all of this: $2,000 to $10,000 per month at mid-tier agencies. Enterprise CRO retainers run $15,000 to $30,000 per month. Before you see a single result, you have invested $4,000 to $20,000 minimum.
Most agency contracts include a disclaimer that results are not guaranteed. Conversion rate depends on product-market fit, ad targeting, audience intent, and dozens of other variables outside the agency's control. You are paying for their time and process, not for outcomes.
What Nebula Delivers vs a CRO Agency
Nebula does not replace an agency for complex, multi-page optimization programs. But for a founder spending $2,000 to $10,000 per month on ads with a single landing page that isn't converting, the comparison looks like this:
| CRO Agency | Nebula | |
|---|---|---|
| First finding | 2--4 weeks | Under 2 minutes |
| First fix available | 4--8 weeks | 48 hours |
| Monthly cost | $2,000--$10,000 | $0 (or $97 per sprint) |
| Sales process | Discovery call + proposal + contract | Self-serve. No call. |
| Signals checked | Custom (varies by agency) | 9 structural signals, automated |
| Minimum commitment | 3--6 months typical | None |
When You Need an Agency (and When You Don't)
This is honest positioning, not marketing copy.
An agency makes sense when:
- You have 50,000 or more monthly visitors and need ongoing multivariate testing.
- You have an internal marketing team that needs senior strategic direction.
- You are managing 10 or more landing pages simultaneously with distinct audiences.
- Your business justifies paying $3,000 per month because a 0.5% conversion lift is worth $50k in revenue.
An agency does not make sense when:
- You are running early-stage paid traffic on one or two landing pages.
- You don't yet know which specific signals are failing on your page.
- You cannot absorb $2,000 to $4,000 in retainer fees before seeing any improvement.
- You need a diagnosis in days, not weeks.
The right order: Run a free diagnostic first. Understand exactly what is failing on your page. Fix the highest-priority signal. Then decide if you need ongoing strategic support, or if the per-fix model is serving you.
The 9 Signals Nebula Checks
Every Nebula audit checks these 9 structural conversion signals automatically, without requiring access to your analytics, your ad account, or your CMS.
Does your headline match the ad that sent the visitor? Misaligned messaging is the top reason paid traffic bounces within 3 seconds.
Is there one clear next step above the fold? Competing CTAs or vague button text reduce click-through.
Are there credible, specific testimonials or trust signals visible without scrolling? Generic reviews do not convert.
Does the page load in under 3 seconds on mobile? Every additional second of load time reduces conversions.
Can a visitor understand what you offer and why it matters within the first viewport? Ambiguity kills intent.
Is the primary CTA tappable and prominent on a phone screen? Most paid traffic now arrives on mobile.
Do the visual and copy signals from your ad carry through to the landing page? Discontinuity triggers distrust.
Are title tags, meta descriptions, and structured data in place? These also affect Quality Score on paid channels.
Is the page structured for AI-assisted discovery? Schema markup and clear answer surfaces affect how AI tools cite and surface your page.
Run a free diagnostic. No agency required.
Nebula checks 9 structural conversion signals on your landing page. Free. Under 2 minutes. No sales call, no retainer, no discovery phase.
$0 diagnostic. $97 Repair Sprint. No monthly commitment.