Can I code Optimizely?

Basic A/B testing — split traffic, track conversions, compare — is genuinely simple. Statistically rigorous results at enterprise scale, with feature-flagging and team workflows layered on, is a different, deeper product.

VIBE SCORE 97/100

how this is worked out

Why CanICodeThis says Borderline

  • Randomly assigning a visitor to variant A or B, persisted in a cookie, is a well-documented pattern
  • Tracking a conversion event per variant and computing a basic significance test is bounded, achievable statistics
  • For a single test on your own site, this register's Unbounce build spec already covers this exact case

Read before building

  • Getting statistical significance genuinely right (avoiding false positives from peeking early, correctly handling multiple simultaneous tests) takes real statistical care beyond a raw percentage comparison
  • Feature flagging at organization scale, with gradual rollouts and instant kill-switches, is real infrastructure beyond a simple A/B split
  • Enterprise permission and approval workflows across large marketing teams are organizational tooling, not a testing feature

Bill of materials

The parts this build actually needs, each rated on its own — the average is the Vibe Score above.

Landing page99
CRUD database95

The build spec

Build me an A/B testing tool: randomly assign visitors to variant A or B, persist the assignment in a cookie, track a conversion event per variant, and show a results dashboard with a proper statistical significance calculation (not just raw percentages — use a standard sequential-testing method to avoid false positives from checking early). Skip feature-flagging and multi-team workflows for v1.

What it actually costs to build

Two real costs, not just "free": the AI agent's own usage, and hosting once it's running. Both are estimated from this app's own effort rating and component list — see the assumptions on the method page.

AI agent — with a subscription (Claude Pro/Max, Cursor, etc.)$0 marginal
AI agent — pay-per-use API, no subscription$43–$86 one-time
Hosting, once it's running$0/mo (free tier)
Domain name, if you want your own~$12/yr

Optimizely's pricing varies — check the source link on this page to compare against your own build cost.

categoryanalytics
time to codea weekend
Borderline
their pricevaries
last checked2026-08 · source ↗

Questions

Can I code Optimizely?

Borderline. Basic A/B testing — split traffic, track conversions, compare — is genuinely simple. Statistically rigorous results at enterprise scale, with feature-flagging and team workflows layered on, is a different, deeper product.

How much does Optimizely cost?

Optimizely's pricing varies by plan — check the source link on this page for current numbers.

What do I lose by building it myself?

Getting statistical significance genuinely right (avoiding false positives from peeking early, correctly handling multiple simultaneous tests) takes real statistical care beyond a raw percentage comparison Feature flagging at organization scale, with gradual rollouts and instant kill-switches, is real infrastructure beyond a simple A/B split Enterprise permission and approval workflows across large marketing teams are organizational tooling, not a testing feature