Experimentation platform

Ship every Spar test idea as a GrowthBook experiment.

Spar generates test ideas, design mockups, and variant code. GrowthBook runs the experiments. Winners and losers flow back into Spar's backlog automatically.

What Spar ships to GrowthBook

Spar drafts the test idea. GrowthBook runs the experiment.

One-click test creation

Every Spar test idea lands in GrowthBook as a configured experiment. Feature flags, variants, and targeting included.

Variant code generation

HTML, CSS, and JS variants are attached to the feature flag, so engineering doesn't have to translate a mockup into code.

Result sync

Lift, confidence, and significance flow back into Spar. Winners promote to the changelog automatically.

Targeting parity

Audience filters and rollout rules respect the scope Spar set for each test.

Connect once

Paste a key, pick an environment, ship.

  1. 1

    Connect your GrowthBook workspace

    Paste an API key with experiment write access. Spar verifies the connection in seconds.

  2. 2

    Pick the environment

    Choose where Spar should ship tests: production, staging, or both. Defaults respect your existing workflow.

  3. 3

    Watch tests deploy

    Every shipped test idea lands in GrowthBook as a draft experiment, ready for review and launch.

Connect GrowthBook in a minute.

Paste a URL, authorize the integration, and watch Spar rank every opportunity into a prioritized backlog.