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// v2.4 — Bayesian sequential testing is live

Stop guessing which version wins.
Prove it.

Crawltic is the developer-first experimentation platform: a full REST/GraphQL API, an MCP server, and a CLI — built to compare any custom metric with real statistical rigor. No dashboard required.

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A Control — current checkout
Add to Cart
Revenue / visitor$41.20
+18.4% lift
B Variant — one-click checkout
Buy Now — Free Ship
Revenue / visitor$48.80
VS
zsh — crawltic
NIMBUSCLOUDPIXELFORGEHOLOSTACKQUANTALOOPVELLUMORBITALLATTICEWORKSNORTHWIND LABS NIMBUSCLOUDPIXELFORGEHOLOSTACKQUANTALOOPVELLUMORBITALLATTICEWORKSNORTHWIND LABS
// 01 · assignment

Every visitor, routed and counted.

Crawltic hashes each visitor to a variant at the edge in under 4ms, keeps them there, and tallies every conversion against the lane they landed in. What you're watching is the exact model the engine runs.

  • Sticky bucketing on user, device, or any custom key
  • Weighted splits, holdouts, and mutual-exclusion groups
  • Bots and internal traffic filtered before they count
traffic-router.live
Visitors · A
0
Visitors · B
0
Assign latency
3.8ms
Built for engineers

Everything you need, none of the dashboard fluff

Crawltic is API-first. Every feature in the UI is also a one-line call.

Full REST + GraphQL API

Create experiments, assign variants, and log any custom event or metric — revenue, latency, retention, whatever matters to you.

MCP Server

Plug Crawltic into Claude, Cursor, or any MCP client. Ask your agent to spin up, monitor, or ship an experiment.

Crawltic CLI

crawltic experiments create — script your entire testing workflow from CI, cron, or your terminal.

Deep Analytics Engine

Bayesian + frequentist stats, sequential testing, guardrail metrics, and automatic sample-size calculators.

Custom Metrics, Any Shape

Not just clicks. Pipe in revenue, EPC, churn, latency, LTV — compare variants on whatever you define as a win.

Autonomous Decisions

Set confidence thresholds and sample quotas. Crawltic ships, pauses, or rolls back the moment the numbers say so.

0%
API uptime
0ms
variant assignment latency
0+
integrations
0B
events processed / mo
// 02 · inference

Watch certainty form in real time.

Each variant is a probability distribution, not a single number. As evidence arrives, the curves tighten and pull apart — and Crawltic tells you exactly how likely B is to beat A.

  • Bayesian posteriors with credible intervals
  • Frequentist p-values side by side, if your team prefers them
  • Sequential testing — peek anytime without inflating false positives
posterior.live — epc
P(B beats A)
50.0%
Sample size
400
Method
Beta-Binomial
Analytics + decision engine

It doesn't just report. It decides.

Probability-to-beat-control tracked live, then an automatic ship once your thresholds clear.

analytics-engine.live — checkout-button
99%90%70%50% 95% significant
Variant B — prob. to beat control Control baseline
Projected lift
+18.4%
Confidence
96.2%
EPC · B
$0.488
Is Variant B worth shipping? metric: EPC
-50%0+50% AB
+18.4%
Variant B earns more per click (EPC) · auto-ship at +10%
Visitors in A (min 1,000)1,000/1,000
Visitors in B (min 1,000)1,000/1,000
Conversions, both groups (min 100)84/100

Recalculated every minute · auto-ships the moment the last quota clears

// 03 · variables

Test variables, not just pages.

Headline, CTA, price anchor, layout — run them together and Crawltic isolates the contribution of each one. The grid shows measured lift per variable, per variant, updating as traffic lands.

  • Multivariate and multi-armed bandit modes
  • Interaction effects surfaced automatically
  • Any combination exportable as its own experiment
/product/fuel-pumpcontrol A
multivariate.live — lift % by variable
A
B
C
D
headline
cta_copy
price_anchor
hero_image
layout
Real time

Every experiment, moving live.

Lift re-ranks as data arrives. Every assignment and conversion streams through the same event log your API reads.

experiments — ranked by lift
checkout-button
pricing-layout
onboarding-v3
search-ranking
email-subject-q3
events.stream
In practice

Real testing scenarios

What a Crawltic experiment actually looks like mid-flight.

checkout-buttonRunning · Day 6/14
Control
Add to Cart
Revenue / visitor$41.20
Visitors5,231
Leading
Variant B
Buy Now — Free Ship
Revenue / visitor$46.80
Visitors5,198
pricing-page-layoutRunning · Day 11/14
Control
3-tier grid
Signup rate4.1%
Visitors12,404
Auto-ship queued
Variant B
Single-plan + toggle
Signup rate5.6%
Visitors12,190
Integrations

Drop into your existing stack

Native SDKs and integrations for the tools you already use.

segment
shopify
nextjs
stripe
amplitude
snowflake
zapier
slack

View all 40+ integrations →

"We replaced two dashboard-only tools with Crawltic's API. Our data team ships experiment logic straight from our pipeline now."

— VP Engineering, NimbusCloud

Start testing in minutes, not sprints.

Grab an API key and make your first call today.

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