6.8% conv. rate
- Traffic
- 50%
- Visits
- 1,184
- Leads
- 81
Split the traffic. Let the leads pick the winner.
Add variants to any published page, set the split, and read visits, clicks, leads and conversions for each. When one wins, set it as Main and switch back to Standard Mode, and it gets all the traffic. The URL in your ads never changes.
Free forever plan. No card required.
4.9
4.6
An A/B test on yourdomain.com/solar: traffic from your ads is split between two variants of the page, with each one's share of the traffic, visits, leads and conversion rate. You can move the split and set a variant as main.
yourdomain.com/solar
Same URL in every ad
9.4% conv. rate
- Traffic
- 50%
- Visits
- 1,222
- Leads
- 115
01Set up
Variants from any page
Duplicate the page and change one thing, or pick another landing page as the challenger. Both variants run on one URL, so your ads stay untouched.
- Test headlines, layouts, images, CTAs or whole designs
- Duplicate a variant, or another landing page
- No code, no second domain
02Split
Traffic weights
Give each variant a weight and the traffic follows it. 100 and 100 is a 50/50 split. Spread Equally evens it out in one click.
03Results
Results per variant
See visits, clicks, leads and conversions for every variant. The variant ID rides in the URL, so ClickFlare or any tracker that reads URL parameters can report sales by variant too.
- Count form submits, link clicks, button clicks or visits as conversions
- Quiz drop-off per step, for each variant
- Set the winner as Main, and Standard Mode sends it 100% of traffic
Test log
Test one change at a time. Keep the winner.
Change one thing, wait for the numbers to settle, and make the winner the next control. Every point you win stays on the page.
Round 1
Headline
The savings figure up front beat the generic promise. B goes on as the control.
Round 2
Form
Two short questions before the contact fields beat one long form.
Round 3
Button
Too close to call, so the control stays and the next round tests the photo.
The math
What a few points of conversion rate are worth.
Same budget, same clicks. Put in your numbers and see what a lift from a better variant adds each month.
Good to know
Tips for A/B tests on paid traffic.
Set these up before you split the traffic, so the winner you scale is a real one.
Pick the conversion first
Form submit, link click, button click or page visit. Switch on the one that matters before the test starts.
Test quizzes too
Put a quiz against a single-step form and compare submits and drop-off per step for each.
One change per round
Change one big thing at a time and run it long enough to trust the numbers.
Set the winner as Main
Set as Main, switch back to Standard Mode, and the winner takes 100% of traffic.
Compare across pages
Reporting ranks every published page by visits, leads or conversion rate.
API and MCP server
Clone variants and pick the winner over the REST API, or set the weights from Claude, ChatGPT or Cursor.
Compared
More traffic for your tests than Unbounce or Instapage.
Where A/B testing starts on each builder, what it costs and how much traffic that plan includes.
| Feature | LanderLab | Unbounce | Instapage |
|---|---|---|---|
| First plan with A/B testing | Grow | Experiment | Optimize |
| Price, billed yearly | $119/mo | $112/mo | $159/mo |
| Price, billed monthly | $149/mo | $149/mo | $199/mo |
| Monthly traffic on that plan | 500,000 visits | Up to 30,000 visitors | 30,000 unique visitors |
| Free plan to build on first | Yes, free forever | No, 14-day trial | No, 14-day trial, card required |
Checked on each vendor's site, September 2026. Prices in USD before tax. Each vendor counts traffic its own way.
“LanderLab has become an essential part of my daily workflow. It allows me to launch campaigns faster, test more variations, and focus on optimization rather than technical work.”
Tracking
See test results in the tracker you already use.
LanderLab puts the variant ID in the URL, so ClickFlare or any tracker that reads URL parameters reports every variant. Clarity and Hotjar record each one too.
Before you start
Which plans include A/B testing?
Grow, Scale and Enterprise. Grow is $149 a month, or $119 billed yearly, with 500,000 visits a month and 3 users. You can build and publish the pages on Free or Launch first and switch the test on when you upgrade.
Does the URL in my ads change?
No. Every variant runs on the same URL and LanderLab splits the traffic behind it. When the test is over, switch back to Standard Mode and the main variant gets 100% of visits.
How do I see the results in my tracker?
Through the variant ID, which LanderLab adds to the URL while a test runs. Add a variantId parameter to the traffic source in ClickFlare or any tracker that reads URL parameters, and report conversions by variant there.
How long should a test run?
Until the numbers settle, which depends on your traffic. Make sure conversion tracking is on before you start, test one major change at a time, and compare conversion rate, clicks and leads per variant before you pick the winner.
Can I test a quiz or a completely different design?
Yes. A variant can be a small edit of the original or a different landing page from your workspace, quizzes included. Each variant keeps its own numbers.
Who can help me set up a test?
Chat and email support come with Grow, Telegram and chat with Scale, and Slack and video calls with Enterprise. The Help Center walks through variants, weights and Set as Main.
Test the next angle without touching the ad.
Start free, build both versions, and switch on the split when you move to Grow.