57 million companies. 189 vendors. 60 million active subscription detections. Refreshed daily and verified on lookup, so every score you act on reflects what your buyers are doing right now.
Not anonymous page visits. Not a panel survey. Real vendor footprints on real domains, graded for confidence and refreshed every day.
“Buyers do not tell you they are shopping. Their software does.”
Most intent data is anonymous, aggregated and weeks old. Subscription signals are deterministic. When an account spins up a competitor trial, lets a contract lapse, or quietly switches off the category leader, that is a real event we can observe and grade. MarketSizer maps these events across the B2B software market and grades them by recency, confidence and competitive context.
Every opportunity in MarketSizer is built from these four layers. The Opportunity Score is what you see; the data underneath is what makes it defensible in a deal review.
Every vendor we see running on a company's domain, scored by status, recency and confidence. We track not just "are they using it" but "are they trialling it, renewing it, or quietly turning it off."
Tells you what they are running right now.
Headcount, revenue band, industry, headquarters and traffic signals stitched to every domain. The fields your ICP rules already need, organised against the same company record as the subscription data.
Tells you if this account is worth pursuing.
Deterministic in-market events, not anonymous page visits. A trial is a new installation observed within the past 30 days. Churn is a recent disappearance of a previously stable signal. Renewals are reasoned from contract cycles.
Tells you if this account is in-market right now.
Vendor-to-vendor relationships across the market: which products replace which, who tends to win in which segment, and where the displacement traffic is currently flowing.
Tells you what you are actually replacing.
You are not looking at a quarterly snapshot. You are looking at the market as it stands this week, with on-demand verification when a specific account matters.
Continuous monitoring of vendor footprints across the public web. We see new installations the same week they go live.
ContinuousWhen you look up a specific company, MarketSizer re-checks their current environment in real time. Live + historical state, not a cached snapshot.
On-demandSignals are deduplicated, standardised against the vendor master, and graded for confidence. One company record, regardless of how the data arrived.
Quality gateBulk refresh runs every day. Trial signals reach your CRM within 5 days of the real-world event. Churn and renewal signals update continuously.
DailyHow we define a trial: a new vendor installation observed within the past 30 days. If a signal persists beyond 30 days, we re-classify it as an active subscription rather than a trial, so the in-market flag does not stay on forever.
>90 percent detection accuracy is not a marketing line. It is what falls out of running every signal through these three gates before it becomes an opportunity.
Every detection ships with a confidence grade. Your scoring rules can choose how strict to be on each play.
A vendor showing up once two years ago is not currently in use. Status is calculated from recency, scan coverage and detection frequency.
Single-source signals do not become alerts. A high-confidence opportunity needs more than one thing to be true at once.
15 minutes. No commitment. We'll show you the accounts in your market that are actively evaluating right now.
No credit card · Tailored to your ICP · Live data, not a slide deck