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3 partner slots open this quarter Experimentation · CRO · For agencies
XP-HERO-01
Previewing VAR A · we test everything, including this headline

The experimentation engine behind your agency.

A/B tests, multivariate, personalization, full CRO programs. You bring the client and the strategy; we engineer everything behind the scenes, flicker-free and under your brand.

AB / 01

A/B & split testing

From simple swaps to complex SPA builds, shipped in days.

MVT / 02

Multivariate testing

Many elements, many combinations, one clean readout.

PZN / 03

Personalization

Audience-targeted experiences that adapt to each visitor.

CRO / 04

CRO & analytics

Research, tracking, and analysis behind every decision.

What we do

Every kind of experiment. One partner.

Agencies bring us everything from a single split test to always-on experimentation roadmaps across multiple clients. These are the four disciplines we run all day, every day.

Core · A/B & split testing

Tests that ship in days, not sprints

Design or hypothesis in, launched experiment out. Coded natively in your client's testing tool, QA'd cross-browser and cross-device, with tracking wired before traffic flows.

  • Client-side
  • Server-side
  • SPA / React / Vue
  • Split URL
Core · Multivariate testing

When one change isn't the question

Headline, image, CTA, layout, tested together. We design the combination matrix, build every variant, and make sure your client's traffic can actually power the test before it starts.

  • Full factorial
  • Fractional designs
  • Traffic feasibility checks
Core · Personalization

One page, many visitors

Returning customers, first-timers, cart abandoners, VIP segments: each one sees the experience that fits. Built on audience targeting in tools like Adobe Target, Dynamic Yield, and Kameleoon.

  • Audience targeting
  • Geo & device
  • Behavioral triggers
  • AI-driven
Core · CRO & analytics

The evidence underneath it all

Funnel analysis, session research, tracking audits, and statistically honest readouts. We support your strategists with the data work, or run the full research-to-roadmap loop with you.

  • GA4 & warehouse
  • Event taxonomy
  • Bayesian / frequentist

QA & cross-device testing

Real devices, every major browser. We also QA tests your own team built.

Feature flags & rollouts

Safe releases and full-stack experiments for logged-in and pricing flows.

Platform migration

Moving clients between testing tools without losing history or momentum.

Rescue work

Untangling inherited setups and flaky tests that nobody trusts anymore.

Step 01 · You

Send the brief

A design, a scribble, or one sentence. Fixed quote and delivery date within 24-48 hours.

Step 02 · Us, invisibly

We engineer & QA

Senior developers build it in your client's tool. Flicker-free, tracked, tested on real devices.

Step 03 · You

Deliver & take the credit

Launch, present, win. Everything carries your name. Your client never hears of us.

Live demo · 01

What flicker looks like

Flicker is when visitors see the old page for a moment before it swaps to the test version. It looks broken and it quietly corrupts the results. Load both builds and compare.

client-website.com/landing
New design
Pick a build and press replay
Typical build · visible swap, ~1.6s of the wrong page Xperimently build · 0ms flicker, variant in the first frame

The fix is engineering, not luck: our code runs before the browser paints its first frame and survives back-button navigation and single-page-app route changes. That is the standard on every build, on every platform.

Live demo · 02

One page. Three visitors.

This is personalization in one tap: the same page, adapting to whoever is looking at it. Pick a visitor and watch the banner, the message, the button, and the recommendations all change.

Welcome! Enjoy 10% off your first order

Recommended for new visitors

Find the setup that fits you

Start with our most loved products, picked from thousands of five-star reviews.

Shop bestsellers
Starter Kit Pro
Bestseller · ₹4,990
Everyday Classic
Bestseller · ₹2,490
Travel Mini
Bestseller · ₹1,290
Audience: new_visitor Powered by audience targeting · zero flicker
Live demo · 03

Your name on everything

When you work with us white-label, every deliverable ships under your brand: reports, QA docs, even code comments. Type your agency's name and watch the report rebrand itself.

Deliverable branded as
  • NDA and non-solicitation signed before we see a single brief.
  • We never contact your client. Ever. You stay the face.
  • Code, docs, and learnings are yours to keep, forever.
Northwind Digital
Experiment report · TEST-204

Mobile checkout: sticky payment summary

E-commerce client · Optimizely Web · 21 days · 184,303 visitors

+18.2%
Checkout completion
98.4%
Confidence
0ms
Flicker measured
Prepared by Northwind Digital Confidential · Client copy

Engagement models

Work with us your way

Four ways to plug us into your agency, from a single project to a fully embedded technical team. Start small, change models any time, no penalty for quiet months.

Model 01

Project-based

Complete execution of a specific client project with a defined scope, a fixed price, and a delivery date that holds.

Best forOne-time or occasional projects: a test, a personalization campaign, a tracking cleanup.
  • Fixed scope, price, and timeline up front
  • No commitment beyond the project
  • Easiest way to try us out
Model 02

Retainer partnership

A monthly block of senior capacity with priority access, flexible scope, and a better rate than project pricing.

Best forAgencies with steady experimentation volume across one or more clients.
  • Priority queue, guaranteed turnaround
  • Scope flexes month to month
  • Most cost-effective for ongoing work
Most popular Model 03

White-label technical team

A dedicated team that works inside your processes, your tools, and your project management, fully under your brand.

Best forAgencies that need real team augmentation without recruiting, onboarding, or bench costs.
  • Dedicated developers who learn your clients
  • Full integration with your workflow and PM tools
  • Scales up or down as your pipeline moves
  • 100% invisible to your clients
Model 04

Consultation & implementation

Strategic guidance plus full execution for complex initiatives: program design, platform selection, migrations, server-side architecture.

Best forAgencies taking on initiatives bigger than their current technical depth.
  • Senior consultation with execution attached
  • Knowledge transfer baked in, not gatekept
  • Your team levels up as the work ships

Not sure which fits? Most partners start project-based with a single paid pilot test, judge the quality, then settle into the model that matches their pipeline.

Tools & platforms

Whatever your client runs, we speak it

Your clients arrive with their stack already chosen. So we stay fluent across all of them, no "sorry, we only do tool X".

A/B, MVT & personalization platforms

10
Optimizely Web Adobe Target AB Tasty Kameleoon VWO Convert.com Webtrends Optimize Dynamic Yield SiteSpect Monetate

Server-side, flags & product experimentation

7
Optimizely Feature Experimentation LaunchDarkly Statsig GrowthBook Split.io PostHog Amplitude Experiment

Analytics & evidence

7
Google Analytics 4 Adobe Analytics BigQuery Segment Contentsquare Hotjar FullStory

Client on something rarer? Send it over anyway. A senior developer who understands experimentation picks up a new tool in days, and we have done it many times.

0+
Experiments delivered
0h
Typical estimate turnaround
0
Flicker, ever
0%
Under your brand

Questions agencies ask

The fine print, in plain words

Not from us. We sign an NDA and a non-solicitation agreement before any work starts. We never contact your client, never reference them anywhere, and every deliverable carries your brand. If you ever want to introduce us directly, that is your call to make, not ours.

It follows the engagement model. Project-based work gets a fixed quote per brief within 24 to 48 hours, so you always know the number before saying yes. Retainers and white-label teams are priced as monthly capacity at a better rate. Either way: no hourly meters, no surprise invoices, and an easy number to mark up in your own proposal.

Both. Many agencies use us purely as an engineering bench: their strategists write the hypotheses, we make them real. Others lean on our consultation model for program design, platform selection, MVT feasibility, and analysis. Your client-facing strategy always stays yours; we make it stronger from behind.

Most standard A/B builds are delivered and QA'd in 3 to 5 working days from an approved brief. MVT and personalization campaigns get a date in the quote, and the date holds. If anything threatens a deadline, you hear about it immediately, not at the deadline.

Those are our favorite briefs. Single-page apps that destroy variants on route change, booking engines, headless storefronts, brutal performance budgets: this is exactly the work we built the studio around. If something genuinely cannot be done safely, we tell you before you commit, with the reason in writing.

You do, fully. All code, documentation, QA notes, and test learnings transfer on delivery. No lock-in, no licensing, nothing held back to keep you dependent. If you stop working with us tomorrow, everything keeps working.

Book a partner call, or just send a real brief. Most agencies start with a paid pilot test: one build, full process, your judgment at the end. If the quality is not obviously there, you have lost one test's budget and gained a benchmark.