Optimizely Web Experimentation

Optimizely Web Experimentation is the enterprise experimentation platform for running A/B, multivariate, and split-URL tests on websites — with a drag-and-drop visual editor that lets non-technical marketers launch tests in hours. TrustRadius scores it 8.7/10 across 599 reviews, praising the ease of use and Stats Engine while flagging the price, learning curve, and the need for developers on anything complex.

What is Optimizely Web Experimentation?

Optimizely is the company that practically invented modern A/B testing — founded in 2010, it grew from a visual editor that let marketers edit pages and split traffic, into the enterprise experimentation standard used by companies like Zoom, eBay, and Airbnb. Web Experimentation is the core web-testing module: marketers create a variation with the drag-and-drop visual editor, set an audience and traffic split, and the built-in Stats Engine tells them — with statistical rigor — whether the variant actually won. Reviewers love that non-technical teams can run the whole loop themselves, and that the platform scales from a first test to a company-wide program: a September 2025 reviewer reported rolling a 4% conversion lift out to all customers after testing. TrustRadius scores it 8.7/10 across 599 reviews with top marks for A/B testing (9.0/10), traffic allocation (9.1/10), and support (10/10). But the same reviewers are consistent about the downsides: a very steep price ("much more expensive than its competitors," with realistic contracts north of $36k/year), a learning curve that overwhelms new users, and a gap between the no-code promise and reality — anything beyond simple tests needs developers, and the visual editor struggles on modern single-page apps. For a mature, well-funded experimentation program it remains best-in-class. For everyone else, VWO, AB Tasty, or Kameleoon deliver most of the value at a fraction of the cost.

Key Features

• *Visual editor** — Drag-and-drop WYSIWYG editing to build variations without code
• *A/B testing** — Split traffic and test any element, rated 9.0/10 by reviewers
• *Multivariate testing** — Test multiple variables and combinations in one experiment
• *Split-URL testing** — Compare entirely different page versions or URLs
• *Stats Engine** — Built-in statistical analysis — no spreadsheet math required
• *Traffic allocation** — Fine-grained control, rated 9.1/10 by reviewers
• *Audience targeting** — Segment and personalize by visitor attributes and behavior
• *Real-time results** — Live dashboards showing performance of every variation
• *Personalization** — Tailor content and experiences to visitor segments
• *Feature experimentation** — Pair with Optimizely Feature Experimentation for flags and rollouts
• *Integrations** — 240+ connectors across the marketing and data stack

Who is it for?

• Established companies with a dedicated experimentation or CRO program and budget
• Marketing teams that want to run tests without waiting on engineering
• Organizations already invested in Optimizely One or the wider Optimizely suite
• Companies that need enterprise-grade stats, governance, and support

Who is it NOT for?

• SMBs and startups — the $36k+/year reality is hard to justify against cheaper tools
• Teams just starting experimentation — VWO or AB Tasty give you the loop for far less
• Companies testing heavily on modern single-page apps — the visual editor struggles
• Anyone expecting fully no-code — complex tests need real JavaScript