Optimizely is the industry veteran, built for Fortune 500 teams with matching budgets. Segmently delivers the same core A/B testing power without the six-figure price tag or month-long onboarding.
$0
Segmently starting price
$50K+
Optimizely starting price / year
< 5 min
Time to first experiment
| Feature | Segmently | Optimizely |
|---|---|---|
| Free tier Optimizely has no free tier; pricing starts at $50K/year | ||
| Starting price | $0/mo | $50,000+/yr |
| Time to first experimentGetting started with Optimizely involves sales calls, contract negotiation, legal review, and technical onboarding, often taking 4–8 weeks before you can run a single test. Segmently takes minutes: paste one script tag, create an experiment, and launch. | < 5 minutes | Weeks of setup |
| InstallationSegmently installs with a single <script> tag, with no build step, no npm package, and no developer required. Optimizely requires SDK integration into your codebase, which means engineering time and a deployment cycle before marketers can do anything. | One line of HTML | SDK integration + developer required |
| Visual editor (no-code)Both tools let you click elements on your live website and make changes (text, colors, layout, HTML) without writing code. Segmently's editor uses your already-installed snippet, so setup is zero extra work. | ||
| Anti-flicker protectionWhen a page loads, there's a brief moment where the original content is visible before experiment changes are applied, causing a "flash" of the wrong version. Anti-flicker hides the page until changes are ready, then reveals it instantly. Without this, experiment data is poisoned and visitors see inconsistent experiences. | ||
| Lightweight snippet (< 10 KB)Segmently's snippet is under 10 KB minified and gzipped. Optimizely's snippet regularly exceeds 100–400 KB because it bundles the entire experiment runtime, audience evaluation engine, and decision tree into one synchronous blocking load. That weight directly impacts your Time to Interactive and Core Web Vitals scores on every page where it is present. Optimizely's snippet is 100 KB+ and synchronous by default | ||
| CSS & XPath element selectorsXPath lets you precisely identify any element by its position in the DOM. Right-click any element in browser DevTools → Copy → Copy XPath, then paste it directly into Segmently. This is especially useful for complex third-party components (like MUI or shadcn) where class names are auto-generated and unstable. Optimizely uses its own selector UI; paste-in XPath is not standard | ||
| URL targeting rulesRun experiments only on specific pages, e.g., only on /pricing, or all URLs matching /blog/*. Segmently supports exact match, contains, starts with, ends with, and regex patterns. | ||
| Device targetingTarget only desktop, mobile, or tablet visitors. Useful for testing mobile-specific layouts or running separate experiments per device type without traffic pollution. | ||
| Traffic percentage controlLimit the experiment to a percentage of visitors; set to 10% to test cautiously before scaling, or 100% to run at full capacity. Visitors outside the traffic window see the original site untouched. | ||
| Per-variant CSS/JS injectionEach variant can carry its own CSS (colors, fonts, layout) and JavaScript (behavior changes, dynamic content) that applies only to visitors in that variant, all without touching your codebase or doing a deployment. | ||
| Multiple variants per experiment (A/B/C/n)You are not limited to a two-way split. Both tools let you run experiments with three, four, or more variants simultaneously, each with its own traffic weight. Useful for comparing multiple price points, hero designs, or CTAs in a single test without running sequential experiments. | ||
| Conversion goal trackingDefine what counts as a conversion: a button click, a form submission, a page view, or a custom JavaScript event. Segmently tracks these automatically and attributes them to the correct variant. | ||
| Multi-page funnel goalsTrack multi-step conversions: landing page → product page → add to cart → purchase. Segmently attributes each step to the variant the visitor was bucketed into, so you can see exactly where different variants win or lose. | ||
| Scroll depth conversion goalA scroll depth goal fires a conversion when a visitor scrolls past a defined depth threshold. Optimizely supports scroll depth as a native goal type. Segmently tracks scroll milestones automatically but does not yet have a one-click scroll goal trigger in the conversion goals UI; it can be configured via a custom JavaScript event goal. Segmently: achievable via custom JS event; native scroll trigger not yet in UI | ||
| Statistical significanceSegmently uses a chi-squared test to calculate whether your results are real or just random chance. Results show confidence levels (e.g. 95% confidence) so you know exactly when to call a winner, and stop wasting budget on a losing variant. | ||
| Persistent variant assignmentOnce a visitor is bucketed into a variant they always see that variant on every return visit. This is non-negotiable for trustworthy results: if the same visitor saw different variants on different visits, your conversion data would be noise. Both tools store assignments persistently, Segmently in a first-party cookie and database; Optimizely in its own visitor profile storage. | ||
| Only first-party cookiesSegmently stores all visitor assignment data in a first-party cookie on your own domain with no third-party tracking. Optimizely uses first-party cookies as its default, but higher-tier plans with audience management and cross-domain features involve additional tracking infrastructure that goes beyond a simple first-party cookie. Segmently uses only first-party cookies; Optimizely may use cross-domain tracking depending on plan | ||
| Non-PII visitor trackingSegmently visitor identifiers are randomly generated UUIDs with no connection to personal data, making them non-PII by default. Optimizely is designed to optionally accept user attributes (including emails and user IDs) at bucketing time for personalization features, which means the level of PII in visitor data depends on how the customer implements it. Segmently visitor IDs are random UUIDs; Optimizely can attach user attributes including emails | ||
| Analytics dashboardSegmently's built-in dashboard shows per-variant visitor counts, conversion rates, statistical significance scores, and trend charts, with no third-party analytics tool required. Everything is in one place. | ||
| Team managementInvite teammates, assign roles (owner, admin, member), and control who can create or pause experiments. Segmently's team features are available from the free tier; Optimizely charges for additional seats. | ||
| REST API accessProgrammatically create, update, and read experiment data via REST API. Useful for CI/CD integrations, custom dashboards, or syncing experiment data with your data warehouse. | ||
| SPA / React / Next.js supportSingle-page apps (React, Next.js, Vue) navigate without full page reloads; the browser never re-runs the snippet. Segmently automatically patches history.pushState and listens for route changes, re-applying your experiment changes after each navigation with zero flicker. Optimizely requires manually calling activateExperiment() inside your router's onRouteChange handler. Optimizely often requires additional SPA configuration | ||
| Dedicated account managerEnterprise customers get a named Segmently contact for onboarding, strategy, and ongoing support, the same level of service Optimizely charges $50K+ per year for. Included on Enterprise plans for both; Segmently at a fraction of the cost | ||
| Contract requiredOptimizely locks customers into annual contracts that require legal sign-off, procurement approval, and payment upfront. Segmently is month-to-month; upgrade, downgrade, or cancel any time with no penalty. Optimizely typically requires annual contracts | ||
| Self-serve signupWith Segmently you can sign up, install the snippet, and run your first experiment without speaking to anyone. Optimizely's process starts with a sales call; you can't try the product until a deal is agreed. Optimizely requires contacting sales | ||
| Transparent public pricingSegmently publishes exact pricing on its website with no contact required. Optimizely deliberately withholds pricing until you're in a sales cycle, a strategy designed to get you invested before the number lands. Price transparency is a trust signal: if a platform won't tell you what it costs upfront, that's a red flag. Optimizely pricing is only disclosed after a sales discovery call | ||
| Experiment schedulingSegmently lets you set a specific start date, end date, or both for every experiment directly in the experiment editor, so campaigns align with launches, promotions, or seasonal events without manual intervention. Available on Professional and above. Optimizely offers scheduling, but only on higher enterprise tiers and through a more complex campaign workflow. Optimizely scheduling requires higher enterprise tiers | ||
| Split URL testingSplit URL testing redirects a segment of visitors to a completely different page URL, letting you test full page redesigns or alternative checkout flows end-to-end. Optimizely Web has supported redirect experiments for years. Segmently now ships this via a secure handoff parameter appended to the redirect URL, so page views, conversion goals, and funnel steps are correctly attributed to the variant on the destination page. Optimizely Web supports redirect experiments natively | ||
| Slack experiment notificationsSegmently fires Slack notifications for experiment starts, pauses, archives, statistical significance reached, project creation, member activity, billing events, and more. Each notification type is individually toggleable per organization. Optimizely has some integration hooks but lacks purpose-built, per-event Slack alerting at this level of granularity. Segmently sends real-time Slack alerts for 15 experiment and org events | ||
| GA4 / Mixpanel / webhook integrationsSegmently's Business tier includes native GA4, Mixpanel, and outgoing webhook integrations so experiment assignment and conversion data flows into your existing analytics stack automatically. Optimizely's integrations exist but are gated behind enterprise pricing that starts at $50K+/year. Segmently includes these at Business tier; Optimizely requires enterprise contracts | ||
| Per-experiment activation delayEach Segmently experiment has its own activation delay setting: 0ms for instant reveal, or a custom delay (e.g. 300ms) so on-page scripts and dependencies finish loading before content is shown. Optimizely's anti-flicker is a global configuration that applies uniformly across all experiments and must be manually tuned in code. Segmently tunes the reveal timing per experiment; Optimizely uses a global anti-flicker config | ||
| Analytics data export (CSV / JSON)Every Segmently analytics view has one-click CSV and JSON export so you can pull experiment results into spreadsheets, BI tools, or data warehouses instantly. Optimizely's data export capabilities are restricted to higher contract tiers and require API access or integrations. Segmently exports per-experiment data on demand; Optimizely export is limited to higher tiers | ||
| Live logs & real-time event streamOptimizely offers diagnostic tools and an event debugger for enterprise customers that let developers verify experiment assignments and goal fires. Segmently does not yet have a real-time live event stream; it is on the roadmap as a Medium Priority item. Segmently roadmap item; Optimizely has event debugger and activity feeds on enterprise | ||
| Change history per experimentOptimizely tracks configuration changes made to experiments, accessible in the experiment history view. Segmently does not yet have per-experiment change history, though an org-level audit log is planned as a Medium Priority roadmap item for Enterprise tier. Segmently roadmap item; Optimizely logs experiment edits on enterprise plans |
Information based on publicly available documentation as of February 2026.
Optimizely's pricing is not publicly listed; you have to contact sales. But industry reports and user reviews consistently place entry-level plans at $50,000–$120,000 per year, with enterprise contracts reaching $500K+. This puts it out of reach for startups, SMBs, and even many mid-market companies.
Segmently is free to start. Paid plans begin at $499/month, roughly 1% of Optimizely's starting price, and include visual editing, anti-flicker protection, funnel goals, and full analytics.
Deploying Optimizely typically involves SDK integration by a developer, QA testing, and a formal onboarding process with their team. For most companies, this means 2–6 weeks before a single experiment runs.
Segmently requires exactly one line of HTML added to your site's <head>. Your first experiment can be running in under 5 minutes.
Optimizely makes sense for very large enterprises running hundreds of experiments simultaneously, needing deep integrations with data warehouses, or requiring long-term dedicated support contracts. If that's you, great. If you want powerful A/B testing without the procurement process, Segmently is the faster path.
One line of code. No contract. No sales call. Full anti-flicker A/B testing running in minutes.