Treat UGC like an experiment, not a vibe.
Run UGC placements against a holdout, read significance before you ship, and attribute the lift, all without a Core Web Vitals regression.
Experiment · UGC grid vs holdout
Welch z-testSignificance
0%
Variants promote only after they clear the bar.
- +22%Avg incremental PDP CR liftIllustrative cohort midpoint; rerun on your own holdout
- 95%Significance barWelch z-test + sequential MAB before auto-promote
- 37 KBWidget runtimegzipped, lazy-loaded media, no CWV regression
- 4 minutesTime to first test
Why CRO teams pick Idukki
Conversion teams don’t want another widget. You want a clean test: a control, a variant, a significance bar you trust, and a revenue number you can defend. The reason UGC is worth a test slot at all is in the data, video reviews convert 4.1× better than text-only on the same SKU (PowerReviews, 2023) and 79% of shoppers say UGC influences what they buy (Nosto). Idukki runs those placements in shadow mode against a holdout, measures incremental lift per layout, and pipes the events into GA4 and Meta CAPI, all on a 37 KB widget that lazy-loads so the PDP speed score holds.
Test placements against a control
Run a UGC layout against a true holdout in shadow mode. Read incremental lift with a Welch z-test and sequential MAB, and only promote the winner once it clears significance. No eyeballing a dashboard and calling it a win.
Lift the PDP without a CWV hit
The widget is a 37 KB ESM bundle that lazy-loads media, so LCP, CLS and INP hold while you add the social-proof block. You get the conversion lever without paying for it in Core Web Vitals.
Attribute revenue per variant
Per-layout, per-variant revenue as first-class GA4 and Meta CAPI events, plus Klaviyo blocks. The lift number that lands in your experiment readout is the same one Finance can reconcile.
Migrate without downtime
Run Idukki alongside your incumbent first, then cut over in a single day with reviews, UGC and rights state preserved. No flicker, no gap in the funnel, no customer-facing downtime.
Significance before promotion
Welch z-test plus sequential MAB. A variant only promotes once it clears the bar, so the lift you report is incremental, not a good week.
Proof, same role, real customers
The modules you’ll use most
A/B significance calculator
Drop in your numbers, read significance and confidence before you promote a variant.
OpenPDP audit
Score the product page for conversion gaps and the social-proof blocks worth testing first.
OpenUGC ROI calculator
Model the incremental revenue from a UGC placement against your current PDP CR and AOV.
OpenWidget-speed checklist
Check a widget’s weight and CWV impact so the lift never comes at the cost of LCP, CLS or INP.
OpenHigh-converting PDP playbook
The layout patterns that move PDP conversion, with what to put into a test first.
Open
Frequently asked
How do you measure incremental lift rather than correlation?
You run the UGC placement against a holdout in shadow mode and read the delta with a Welch z-test (and a sequential MAB when you want to allocate traffic as evidence accrues). Promotion only happens once the result clears your significance bar, so the number you report is incremental, not a coincidence on a good week.
Will adding the widget regress Core Web Vitals?
No. In a live PageSpeed Insights run (12 Jun 2026, Desktop) the widget scored 99 Performance / 100 Accessibility / 100 Best Practices / 100 SEO with FCP 0.4 s, LCP 0.9 s, 0 ms Total Blocking Time and CLS 0. The runtime is 37 KB gzipped and lazy-loads media. Run pagespeed.web.dev against widget.idukki.io to reproduce it.
Can we run it alongside our current tool during the test?
Yes. Idukki runs in shadow mode next to any incumbent, so you can validate lift before committing. Migration is a single-day cut-over with reviews, UGC and rights state preserved, and no customer-facing downtime.
Tell us your context, we’ll show you the right setup.
We reply within one business day with a sample workspace tailored to your role and stack.
Want results like these?
Bring your own data, see the same numbers in 30 minutes.
We’ll spin up a sample workspace pre-loaded with your live IG / TikTok / Reviews so you can compare apples to apples before signing anything.
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- SOC 2 + GDPR
