Discover page-side leaks.Fix conversion before blaming ads.
Check your landing page against 9 conversion signals before spending more on ads. See what's wrong. Ranked by priority. No signup.
147+ landing pages analyzed · 2.9 avg leaks found
This is the output. Not a pitch deck.
Nine pass/fail checks against the public HTML. Each finding carries the raw value from the page. Ranked by priority. The block on the right is an illustrative sample, not a live result.
Sample output format, illustrative findings
9 Conversion Signals
What Nebula checks
Observable page conditions. Specific pass standards. Evidence from your HTML.
Does your page match your ad?
Ad promise vs. page headline
Check: Ad headline matches page headline and names the buyer outcome
Is your CTA the only clear action?
One clear primary action with action + outcome copy
Check: Primary CTA uses action + outcome copy, visible in initial viewport
Is your value visible before scroll?
Primary CTA, headline, and proof visible before scroll
Check: Primary CTA, ICP-specific headline, and trust signal all visible above fold
Do you have proof next to your CTA?
Proof visible near the first CTA
Check: Named testimonial, review count, or customer logo visible near primary CTA
Does your page load before visitors bounce?
Page does not leak visitors while loading
Check: LCP under 2.5s, CLS under 0.1, INP under 200ms on mobile
Can mobile visitors easily convert?
Page renders correctly on mobile
Check: Primary CTA visible and usable on 375px viewport without zoom
Are your ad tracking pixels firing?
Recognized ad-tracking artifact present
Check: Facebook Pixel, GA4 ID, or UTM-bearing link present in static HTML
Do search engines understand your hierarchy?
Title tag, meta description, and descriptive H1
Check: Title tag, meta description, and single descriptive H1 all present
Can AI agents accurately cite your product?
Structured signals support machine-readable interpretation
Check: JSON-LD, OG tags, and clean DOM hierarchy present for AI citation
Open-Source Verification
Citable CLI: 123 detectors across 18 namespaces
Transparent, verifiable checks. No black-box AI guessing. Licensed under Apache 2.0. Run the exact same detection engine locally or in CI.
Named pages. Named failures.
Public audits from the same engine. Same format. Same evidence standard.
knallhart.dev
Nebula ran its evidence-backed audit on knallhart.dev - the "AI roasts your website" tool whose founder posted 935 impressions / 38 clicks / 0 sales from Google Ads. The page itself is better than most: clear CTA, real email examples, price stated. The leak is where his traffic actually comes from.
3 findings documented
View the full report →
postmint.de
Nebula ran its evidence-backed audit on postmint.de/en - the "one sentence into a social graphic" tool whose founder published a full launch autopsy: 118 visitors, 0 external signups, 5-second bounces. The two bugs he diagnosed himself are both fixed on the current page. Two observable defects remain - one of them a genuine technical find.
2 findings documented
View the full report →
basecamp.com
A $100M company with a landing page that fails five documented conversion checks. This is what happens when brand equity carries a page that the engine can still read.
5 findings documented
View the full report →
Beta Customer Feedback
What founders say about the diagnosis
Early feedback from operators and founders auditing live campaign landing pages.
“Nebula caught a headline mismatch between our Google Ads copy and our pricing hero in 30 seconds. We updated the H1 and the message match passed on re-audit.”
Alex R.
B2B SaaS Founder · Google Ads
“The One-Leak Repair Sprint delivered the exact replacement CTA and mobile layout fix within 24 hours. Having the 30-day re-audit gave us confidence it was implemented properly.”
Sarah K.
Ecommerce Growth Lead · Meta Ads
“Every other CRO tool gave us generic tips like 'add more social proof'. Nebula showed us the exact DOM selector and distance from the CTA. Refreshingly concrete.”
David M.
Agency Operator · Client Accounts
“We were blaming our LinkedIn ad targeting for high bounce rates. Nebula proved our mobile hero CTA was below the fold on mobile viewports. Fixed it the same afternoon.”
Elena V.
Marketing Director · LinkedIn Ads
“The radical transparency is what sold me. No bogus 'guaranteed 40% lift' promises - just inspectable HTML evidence, clear priority scores, and a verifiable re-audit.”
Marcus T.
Bootstrapped Founder · Paid Search
$97 · one-time
One leak. One repair. Then re-audit.
After the free audit, the Repair Sprint writes the exact copy, code, or configuration change for the highest-priority finding. You implement it. Nebula re-runs the same check within 30 days. No conversion lift is promised. The re-audit confirms whether that condition changed.
- ✓One page, one finding, one bounded change
- ✓Exact replacement text or snippet, not "improve your H1"
- ✓Delivered within 48 hours of payment
- ✓Same-scope re-audit inside 30 days
- ✓No CMS, hosting, or repo access required
What the audit can prove. What it cannot.
A click confirms interest. The page is what the visitor encounters next. Nebula reads public HTML. It does not estimate revenue, judge your offer, or end in a discovery call.
Observable
- ✓Headline vs ad promise, as written on the page
- ✓Whether a primary CTA is visible in the first viewport
- ✓Whether named proof sits near that CTA
- ✓Mobile usability, load thresholds, tracking artifacts, SEO and AI markup
Not claimed
- ✕Conversion lift, ROAS, or revenue from a page change
- ✕Traffic quality, audience fit, or offer economics
- ✕What happens after the form or checkout
- ✕A sales call, retainer, or generic 8-point PDF
We run this audit on ourselves first. When we have a real client outcome with dates, proof, and a way for you to verify it, it will appear here. Until then: see initial findings before sharing an email. If the page passes the relevant checks, look at traffic, offer, or downstream flow. If it fails, fix the highest-priority condition first, then re-audit.
Direct answers
How long does the free landing page audit take?
Under 2 minutes. Paste your URL and get a scored 9-signal diagnosis with findings ranked by priority.
What's included in the $97 One-Leak Repair Sprint?
One landing page and one high-confidence audit finding. Exact copy, a code snippet, or a configuration change. You implement it. Includes one same-scope re-audit within 30 days.
Why do landing pages fail to convert paid traffic?
Most landing page failures follow diagnosable patterns: the ad promise does not match the page headline, no social proof appears above the fold, the CTA is hidden on mobile, the page loads too slowly, or the primary action competes with secondary links.
Do you need access to my website to run the audit?
No. We audit the public page. Paste your URL. No login, dashboard access, or repository is needed for the free audit.
Check the page before you change the ad.
Free, no signup. Observable conditions, ranked by priority.
Run Free Audit →