Validate your startup idea before you build it
Most ideas fail on something you could have checked first: too few customers at the price you need, costs that eat the margin, or a rival who can undercut you. SparkTower puts your idea into a market of its own and plays it forward, so you find that out in an afternoon rather than a year.
Start from the closest kind of business
Pick from dozens of ready-made markets — a café, a SaaS, a mobile app, a cleaning company, a YouTube channel — each checked against what real businesses of that kind turn over. Or describe your idea in a sentence or two and Nova, SparkTower's AI, writes the market around it.
Three questions every idea has to answer
Are there enough customers who will pay what you need to charge? Does the money last until they arrive? And what happens when a rival cuts its price or outspends you? The simulation answers each one in numbers, period by period.
See what a steady version earns, free
The free preview plays a careful, ordinary plan for every year of the simulation and shows what it ends up with: revenue, profit, customers and share of the market, plus every warning worth reading. If a steady plan cannot make it work, that is worth knowing before you quit your job.
Try your own numbers
Change the price, the marketing, the team and the strategy, and see your version side by side with the steady one — signed out, before you pay anything.
Then play it for real
Starting your own simulation is $10, once. You make every decision — price, marketing, hiring, capacity, borrowing — and each period resolves against the rivals and the economy, with a forecast before you file.
What a simulation can't tell you
It cannot tell you whether people love the product. Talk to customers, take pre-orders, put up a landing page. The simulation tells you whether the business works if they do — and how many of them it needs.
How do I validate a startup idea quickly?
Check three things: that enough customers exist at the price you need, that your cash lasts until they arrive, and that you survive a rival's response. On SparkTower you can preview a market for your kind of business for free and see what a steady plan earns before spending anything.
Is a simulation enough to validate an idea?
No — it checks the economics, not whether people want the product. Use it alongside customer conversations and pre-sales: they tell you about demand, the simulation tells you whether that demand is enough.
How much does it cost?
Browsing the simulators and previewing one is free, and you can try your own price, marketing and team without an account. Starting your own simulation is $10, once, with your seat included.
Can it use my own figures?
Yes. Every number in the market can be changed, and if you already trade you can upload a profit and loss or a month-by-month sales history and the simulation is fitted to your real figures.