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Spar vs VWO

VWO is the experimentation toolbox. Spar is the experimentation team.

VWO is the unified experimentation suite (A/B, multivariate, server-side, heatmaps, surveys), recently merged with AB Tasty, built for teams with a dedicated CRO function. Spar runs the audit, the ideation, and the variation code, and declares the winner, for ecommerce teams that don't want to staff one.

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Side by side

Spar vs VWO at a glance

VWO is the toolbox a CRO team operates. Spar is the team: it audits the store, ranks the bets, ships the variations, and declares the winners.

  • Workflow coverage
    VWO
    Audit
    Idea
    Test
    Measure
    Coverage: Audit not covered, Idea not covered, Test covered, Measure covered
    Spar
    Audit
    Idea
    Test
    Measure
    Coverage: Audit covered, Idea covered, Test covered, Measure covered
  • Operating model
    VWOUnified experimentation suite a CRO team uses to run tests they design.
    SparProductized growth team. Audits the storefront, ranks the bets, ships the variations, declares the winners.
  • AI depth
    VWOCopilot assists. Suggests tests, drafts variation copy, summarizes recordings, configures targeting. Humans drive every step.
    SparAutonomy. Audits the storefront, drafts the hypothesis, generates the variation code, declares the winner with sequential stats.
  • Where the test idea comes from
    VWOYour team writes hypotheses from heatmaps, recordings, surveys, funnels, and Copilot suggestions.
    SparAn opinionated rule library scores every page type by evidence and revenue impact. Spar drafts the idea.
  • Where the variation code comes from
    VWOVisual editor for marketing changes. FullStack server-side SDK plus dev hours for anything bespoke.
    SparSpar generates the variation code from the audit. You can prompt, code, view, and approve before it goes live.
  • Ecommerce delivery
    VWOGeneric SmartCode snippet. FullStack SDKs for server-side.
    SparNative Shopify theme app extension. Embed delivery for non-Shopify. GA4 and Clarity wired in.
  • How winners get called
    VWOSequential stats engine. Your analyst interprets and decides.
    SparSequential statistics declare the winner automatically. You can review the decision.
  • Pricing model
    VWOTiered by MTU. Growth from $198/mo annual (30k MTUs), Pro $475/mo (100k), Enterprise custom. Bundled with heatmaps, surveys, and FullStack.
    SparTransparent monthly tiers, published.
  • Storefront audit that finds UX gaps
  • Revenue-impact ranked opportunities
  • On-page buyer journey analysis
  • AI-generated variation code from the audit
  • Ship-without-testing lane for obvious fixes
  • Multivariate testing
  • Server-side / FullStack experimentation
  • Feature flag management
  • Bundled heatmaps, session recordings, and surveys
  • Sequential statistical engine
  • Native Shopify theme app extension
  • Auto-surfaced GA4 and Clarity observations
  • Shareable stakeholder-ready CRO reports
The work between an idea and a shipped variation

Spar covers every stage.

VWO covers the back half with depth. The first three are work the platform assumes a CRO team handles.

  • 01Audit
    Find the highest-impact gaps on the storefront.
    Your teamHeatmaps, recordings, surveys surface raw signals. Your analyst still has to read them and decide what to test.
    SparRule library scores every page type by evidence and revenue impact.
  • 02Ideation
    Turn the gap into a testable idea.
    Your teamCopilot suggests; your strategist writes the hypothesis.
    SparHypothesis drafted from the audit, evidence library, and VoC. Ranked by expected lift.
  • 03Variation code
    Build the variant that actually ships to traffic.
    Your teamVisual editor for marketing changes. Dev hours for bespoke. FullStack SDK for server-side.
    SparVariation code generated from the audit. You approve before live.
  • 04Ship & measure
    Roll out, gate by traffic, watch for SRM.
    Platform + your teamVWO runs the test. Your team owns QA and rollout cadence.
    SparTheme app extension delivery. GA4 + Clarity wired in. No flicker.
  • 05Winning variation
    Decide what wins and what ships permanently.
    Your analystSequential stats engine. Your analyst interprets and declares the winner.
    SparSequential statistics declare the winner automatically. You review.

Illustrative. Spar's coverage shown reflects the product surface; VWO's owner labels reflect the typical team setup the platform assumes.

Which one fits the team you have today

Pick VWO if

  • You already run a CRO function and need a deep, mature toolbox: multivariate, FullStack server-side, feature flags, personalization, sequential stats.
  • You want bundled heatmaps, session recordings, surveys, and funnels in the same suite as your A/B tests.
  • You need enterprise procurement (SOC2, ISO, GDPR, EU residency, named CSM) and have the headcount to operate a unified suite.

Pick Spar if

  • Your team is leaner than a full CRO function.
  • You sell on Shopify and want native theme delivery without a separate dev cycle.
  • You want an audit and ranked backlog produced for you rather than an empty workflow you staff.
  • You want a transparent monthly price you can plan around.
FAQ

Questions buyers ask

A toolbox, or the team itself

See the example site live: ranked opportunities, the evidence behind each, and the first variation ready to test on a real store.

See an example site