Comparison · Product experimentation

Duelpilot vs GrowthBook

Open-source feature flags and warehouse-native A/B testing, self-hosted or cloud, for product, engineering and data teams. Duelpilot is A/B testing run by your own AI agent over MCP, with a person approving every launch. Both can be used by an AI agent over MCP. The biggest difference is who launches: in GrowthBook an agent can start tests itself, in Duelpilot a person approves (or an owner's autopilot policy, within guardrails). GrowthBook is priced per seat; Duelpilot is flat per site, without AI credits.

Last reviewed 2026-10-17Markdown version

At a glance

	Duelpilot	GrowthBook
MCP server or agent API	Yes Remote MCP server with 48 tools; OAuth for claude.ai and ChatGPT, bearer token elsewhere. source	Yes Hosted at mcp.growthbook.io/mcp or local via @growthbook/mcp. source
Your own agent designs variants	Yes Your agent designs 2–4 variants per idea, each with a preview and a device check. source	Yes growthbook_api_write can make any write call the REST API allows, including creating experiments. source
An agent can launch tests without a person	No A person approves every launch; an owner can switch on an autopilot policy with guardrails, never an agent. source	Yes Optional: the API write tool can start experiments; confirmation can be required per API key, and the bundled skills describe draft, review, publish. source
Visual tests on any website	Yes One script tag; works with React/Next.js, Vue, Astro, SPAs and strict CSP. source	Partly AI Visual Editor (Chrome extension) on Pro and Enterprise; delivery through the Script Tag, JS/React or Edge SDK. source
Server-side / code experiments	Yes Code plan only: your agent builds the arms in your repo behind Duelpilot flags. source	Yes Feature flags and server-side experiments are the core product. source
Sequential (peek-safe) statistics	Yes mSPRT: always-valid p-values, safe to check daily. source	Yes Sequential testing available with the frequentist engine; Bayesian is the default. source
Charges for AI usage / credits	No The AI runs in your own agent's subscription. source	Partly No credits, but AI usage limits differ by tier (limited on Starter, 5x on Pro, custom on Enterprise). source
Free plan	No No free plan; your first test is free on every plan, Starter from €9/month. source	Yes Starter is free for up to 3 users; self-hosted open source is free. source
Pricing model	flat per site	per seat

Duelpilot and GrowthBook side by side. Each cell links to its source.

Pricing

Duelpilot

Pricing: flat per site

Starter €9/month (€7 billed yearly); Pro €49/month (€39 billed yearly); Team €149/month (€119 billed yearly, 5 sites); Code €199/month (€159 billed yearly, 5 sites); Enterprise on request. No free plan; the first test is free on every plan.

source

GrowthBook

Pricing: per seat

Starter: Free, no credit card required (up to 3 users, 1 project); Pro: $40 / seat / month (up to 30 users); Enterprise: Custom. Open source self-hosting free.

source

Prices as published by each vendor on the date checked, excluding VAT. Duelpilot has no visitor meters and no AI credits: the AI runs in your own agent's subscription.

What GrowthBook does well

Open source and self-hostable; unlimited flags, experiments and traffic on every tier (growthbook.io/pricing).
Warehouse-native: analyses run on your own data warehouse (growthbook.io).
Bayesian or frequentist engine with CUPED; sequential testing on the frequentist engine (docs.growthbook.io/statistics/overview).
Hosted MCP server with OAuth, or local via npm/Docker (docs.growthbook.io/integrations/mcp).

What Duelpilot does well

Your own agent does the research, design, checks and monitoring over MCP (48 tools); no AI bill from Duelpilot.
A person approves every launch: no MCP tool can approve, launch, pick a winner or ship.
Always-valid sequential statistics (mSPRT) with Holm correction, sample-ratio-mismatch checks and guardrail metrics.
Every variant gets a preview link and a site check on phone, tablet and desktop before anyone can approve it.
Flat price per site, published, from €9/month, and your first test is free on every plan; no visitor meters.

Where Duelpilot falls short

You need an AI agent that speaks MCP; without one there is no visual editor to build variants by hand.
No heatmaps or session recordings: Duelpilot counts results and sends variants to your own analytics.
A young product (2026): fewer integrations and a shorter track record than established tools.

Which one should you choose?

Choose GrowthBook if…

Choose GrowthBook if you have engineers and a data warehouse and want open-source feature flags and experiments you can self-host, analysed on your own data.

GrowthBook website

Choose Duelpilot if…

Choose Duelpilot if you want visual tests on any website without SDK work or a data team, with your own agent doing research, design and real-browser site checks, at a flat price per site rather than per seat.

How Duelpilot works

Try Duelpilot with your own agent

Give your agent one line: set up Duelpilot for my site using /agents.md. It opens a workspace, installs and verifies the script, and drafts the first test; you approve what goes live. Try your first test free or see pricing.

Questions

Is GrowthBook a better fit for feature flags?

Yes. GrowthBook is a feature-flag and experimentation platform first, open source and warehouse-native. Duelpilot's flags exist only for code tests on its Code plan.

Can an agent launch GrowthBook experiments?

GrowthBook's MCP exposes the REST API, so an agent with a write key can, unless you set the key to require confirmation. In Duelpilot no agent can launch or ship.

Does GrowthBook have a visual editor?

Yes, on Pro and Enterprise, as a Chrome extension; tests are delivered by one of GrowthBook's SDKs, including a script tag. Duelpilot's visual tests are on every plan, from Starter at €9/month.

Which is cheaper?

GrowthBook Starter is free for up to 3 users and Pro is $40 per seat per month. Duelpilot is €9, €49, €149 or €199 per month flat per site, with unlimited team members on Team and the first test free.

Sources

Last reviewed 2026-10-17. Spot an error? Tell us.

MCP Server | GrowthBook Docs (checked 2026-10-17)
AI Visual Editor | GrowthBook Docs (checked 2026-10-17)
Pricing | GrowthBook (checked 2026-10-17)
Statistics Overview | GrowthBook Docs (checked 2026-10-17)
Duelpilot instructions for AI agents (checked 2026-10-17)
Duelpilot overview (checked 2026-10-17)
Duelpilot pricing (checked 2026-10-17)