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Find out if your idea is worth pursuing.

Know if it’s worth pursuing, and what to fix, within about 2 weeks. Your first full stress test, all 7 tests, is free.

Get your free diagnostic See plans

No credit card. Honest, not flattering. Your idea stays yours.

Built on Lean Canvas, the one-page business model by Ash Maurya, used by founders in 134+ countries.

What do you need to know next?

Every path starts with the free Business Model Check, at your stage.

Start here: your free Business Model Check Problem/Solution Fit Solution/Customer Fit Product/Market Fit Scale ~3 months ~9 months ~21 months ~36 months
Click where you are. Typical timeline from the Continuous Innovation Framework. Every startup moves at its own pace.

Find out if your idea is worth pursuing

I have an idea

  1. FreeBusiness Model Check
  2. ThenStarter: Founder/Model Fit · $25/mo

Check your idea and fix its weak spots

Land your first paying customers

I'm building it, or built it with no customers yet

  1. FreeBusiness Model Check
  2. ThenPro: Demand Validation · $50/mo

Talk to customers and prove they want it

Grow it into a real business

I have paying customers

  1. FreeBusiness Model Check
  2. ThenPower: Growth Engine · $100/mo

Find and fix what is holding back growth

How it works

The way a good advisor works: understand your situation first, then show you the path.

  1. Know where you stand

    Free

    LEANSpark checks your idea or business against a proven method and shows you the one thing most likely to hold it back, explained in your own words.

  2. Know what to do next

    First fix free

    The first fix for each test is free. Starter gives you the full fix plan, with dates: what to do this week, what LEANSpark does for you, and what only you can do.

  3. Get it done

    Your plan

    LEANSpark drafts the scripts, analyses your interviews and numbers, and tracks every experiment. You make the calls and talk to customers.

Free

See what's holding your startup back.

Business Model Check

$0
  • Your canvas, goal and numbers, free for good
  • A full stress test of your idea, all 7 tests, with a report
  • The first fix for each test, in your own words
  • Then 1 re-test per test and 10 coach replies to work through the fixes
  • Your canvas and report stay yours after the trial

You tell LEANSpark about your idea or business. It does the checking.

A one-time free trial, not a monthly allowance. One idea.

Get your free diagnostic

No credit card.

Pro

Prove customers want it and will pay.

Demand Validation

$50 /mo

Less than one hour of an advisor reviewing your discovery work ($250–1,000 an hour). Going it alone often means 6–18 months of building before you learn if anyone will pay.

  • Interview scripts and a plan for finding people to talk to
  • Every interview analysed: why people would, or would not, switch to you
  • Plan what to show customers, and what to ask them to pay
  • Two-week work cycles that end in a clear go / no-go
  • The Problem Discovery playbook and the DVP course
  • Everything in Starter

LEANSpark drafts your interview plan and analyses every interview you bring. You have the conversations.

Starter's limits, plus up to 25 interviews analysed and 5 cross-interview studies a month.

Start Demand Validation

Your first full stress test is free.

Power

Find and fix what is holding back growth.

Growth Engine

$100 /mo
  • Connect your revenue data: see where customers drop off, from first visit to paying and staying
  • Your growth bottleneck named, with the experiment to run next
  • A 90-day growth goal, with a review on a set date
  • Playbooks for pricing, channels and keeping customers
  • Everything in Pro

LEANSpark reads your numbers, proposes each experiment and tracks the results. You run the business.

Generous limits for growing businesses.

Start Growth Engine

Your first full stress test is free.

Not ready to subscribe? A one-time pack covers the stress test, with no subscription, until it is used up.

30-Day Money-Back Guarantee. No questions asked.

If LEANSpark is not right for you, ask for a refund of your first month within 30 days.

Building with partners? Same plans, 20% off for each person, one shared workspace. Start a team workspace →

Schools, accelerators & enterprise

Run LEANSpark across a cohort or an organization: admin console, per-founder allocation, annual contracts and dedicated onboarding.

Book a demo See enterprise →

What has actually happened inside LEANSpark

  • 6,060 founders at work
  • 7,219 ideas in play
  • 8,716 stress tests completed
  • 2,121 customer interviews logged
  • 136+ countries founders work from
  • 32+ languages founders work in

58% of stress tests fail. That is the point — a scorecard that always passes tells you nothing. Counts from the live product, updated hourly. No estimates, no projections. How these are counted.

Frequently asked questions

Is the diagnostic really free?
Yes, and no credit card is needed. Your free trial is a full stress test of your idea, all 7 tests, with a report and the first fix for each test. Then you get 1 re-test per test and 10 coach replies to work through the fixes. It is a one-time trial, not a monthly allowance. Your canvas, goal, numbers and report stay yours after it. The full fix plan, more re-tests and more coaching are on Starter.
Which plan is right for me?
Pick the one that matches where you are: Starter (Founder/Model Fit) if you have an idea, Pro (Demand Validation) if you are building and need proof that customers want it, Power (Growth Engine) if you have paying customers and want to grow. Your free diagnosis will confirm it.
Why not just ask ChatGPT?
ChatGPT answers the question you ask. LEANSpark checks your whole business model against a proven method, remembers your evidence from one session to the next, and tells you what you did not think to ask. See the comparison.
Will it just tell me my idea is great?
No. Most ideas do not pass the first time, and that is the point: finding the weak spots early is cheaper than finding them after a year of building.
Is my idea private?
Yes. Your ideas, interviews and numbers belong to you. See our privacy policy for exactly how your data is handled.
Are there limits?
Yes, and they are generous. Starter includes up to 100 test runs and 100 coach replies a month; a test run is one of the 7 tests scoring your canvas. Pro adds up to 25 interviews analysed and 5 cross-interview studies a month. Most founders never get near a limit. You will only see one when you get close to it, in plain terms, like interviews left this month. In a heavy month you can add a one-time top-up, or move up a plan.
I already subscribe. What changes for me?
Nothing, as long as you stay on your current plan.
What is the guarantee?
30-Day Money-Back Guarantee. No questions asked. If LEANSpark is not right for you, ask for a refund of your first month within 30 days.
Can I change my plan or cancel?
Yes. Move up when your plan takes you to the next stage, or cancel any time; your plan stays active through the current billing period.
Do you offer plans for teams, schools and accelerators?
Yes. Teams building together get the same plans at 20% off for each person. For schools, accelerators and innovation teams, book a demo or see the schools, accelerators and enterprise pages.

See what's holding your startup back.

Your first full stress test and report are free.

Get your free diagnostic