Evaluating Market Size & Demand for New SaaS Products
You don't need a $5,000 industry report to size a market. Here's how indie founders can do credible saas market research with free tools.
How do you do saas market research without a big budget? In summary, the key metric for indie-friendly market research is triangulating from free public signals — job postings, subreddit size, competitor customer counts, and search volume — rather than relying on a single vague TAM number that doesn't actually predict whether your specific niche will pay.
Skip the top-down TAM slide
"The global software market is worth $500 billion" tells you nothing useful about whether 500 property managers will pay $99/month for your specific tool. Bottom-up estimates — built from real, countable signals — are far more useful for an indie founder than a top-down industry-report number.
Free signals that approximate market size
| Signal | What it estimates |
|---|---|
| Job postings for the target role | Roughly how many companies employ your buyer persona |
| Relevant subreddit/community member counts | A lower bound on how many people are actively engaged in the niche |
| Competitor customer counts (from case studies, press) | Proof the market already pays, plus a rough ceiling |
| Search volume for related terms | How many people are actively searching for a solution today |
See proven revenue potential by niche
The top revenue SaaS niches of 2026, ranked by MRR potential and validation difficulty.
Explore top niches →Demand beats size for an indie founder
A market of 5,000 people who are actively, urgently searching for a fix beats a market of 5 million who are mildly curious. Indie-scale businesses need depth of demand from a reachable audience far more than they need a huge total addressable market — see our vitamins vs. painkillers framework for how to judge urgency directly.
Put a number on it before you build
Combine at least two of the signals above into a rough estimate — for example, job postings times an assumed adoption rate, cross-checked against subreddit size. It won't be precise, but it will be far more grounded than a guess, and it gives you a number to revisit once real usage data starts coming in.
Frequently asked questions
What is TAM, SAM, and SOM, and do I need them as an indie founder?
TAM (total addressable market), SAM (serviceable addressable market), and SOM (serviceable obtainable market) are useful frameworks for structuring an estimate, but the exercise only matters if the underlying numbers come from real signals — the framework itself doesn't create insight on its own.
How small can a market be and still support a solo SaaS business?
A market with a few thousand highly engaged, high-willingness-to-pay customers can support a solid solo or small-team business — market depth and urgency matter more than raw size at this scale.
Where can I find competitor customer counts?
Case studies on a competitor's own site, G2/Capterra review counts as a rough proxy, and press releases or funding announcements (which often cite customer numbers) are all free, publicly available sources.
Skip the manual market sizing.
Every idea in our feed is already scored on demand strength.
Browse validated ideas →