Reach in-market buyers before your competitors do
Score, prioritise, and act on every opportunity in your market.
GTM teams waste time on the wrong accounts.
Most sales and marketing effort fails because teams cannot answer three questions before they engage: Is this account a good fit? Are they actively evaluating right now? Can we actually win this deal? MarketSizer answers all three - before your first outreach.
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From market signal
to won deal
Three layers of intelligence that turn raw evaluation signals into qualified, prioritised, actionable pipeline.
See who's actively evaluating
We track real evaluation activity - active trials, competitive churn, renewal windows - not anonymous web visits.
Rank by fit, intent, and win likelihood
Opportunity Score combines ICP match, purchase intent, and scenario-specific win probability - backed by 70M+ historical subscription outcomes.
Reach them before the window closes
Context-driven outreach generated from live signal data. Every message is specific to this account's moment.
Subscription intelligence,
end to end
From opportunity discovery to orchestrated outreach - capabilities that compound into unfair timing advantage.
Opportunity Discovery
ICP scoring, purchase intent, win likelihood, and ACV estimates in one ranked feed. Every account pre-qualified before a rep sees it.
- Opportunity Score ranking across every account
- Estimated current and potential ACV
- Filter by vendor, signal type, geography
Evaluation Signals
Real-time detection of active software evaluations and competitive signals. Know which vendor is being trialled, how far in, and when the window closes.
- 2.5M+ active evaluations monitored
- Timing windows with expected decision dates
- Signal validation and confidence scoring
Win Likelihood
Scenario-specific win probability from 70M+ historical outcomes. Calculated for this vendor, this signal type, this market segment - not a generic score.
- 70M+ outcomes powering the model
- Vendor x segment x signal granularity
- 5-year switching propensity data
See it live
Want to see this working on your ICP?
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
More platform capabilities
Beyond the core intelligence - everything else your GTM team needs, built in and already connected.
Lead Qualification
Inbound leads scored in real time with ICP match, intent, and win probability. Route only the accounts worth pursuing.
Retention & Expansion
Flag at-risk accounts and spot cross-sell and upsell opportunities before renewal. Protect and grow existing revenue.
Winback Opportunities
Identify former clients back in-market and reach them before competitors do. Turn past relationships into new pipeline.
Outreach Orchestration
Automated personalised outreach powered by live account intelligence. Signal-specific sequences generated in minutes, not hours.
Market Intelligence
5-year market mapping with renewal cycles and switching propensity data across 200+ vendors and 140+ countries.
Integrations
Native connections to HubSpot, Salesforce, Pipedrive, Attio, Apollo, and Chrome Extension. No middleware required.
Pay for what you can win.
From $0.10 to identify a qualified opportunity. Around $10 to activate a 5-star opportunity. Half the fee is deferred until you convert.
“Most intent tools tell you who's researching. MarketSizer tells you who's actively trialing a competitor - and when their contract window closes.”
Unlike generic intent signals, MarketSizer tracks real evaluation activity: vendor-specific trials, competitive displacement moments, and renewal cycles. Backed by 70M+ historical subscription outcomes, not anonymous page visits.
Every GTM role gets the intelligence they need
MarketSizer adapts to how your team works - from frontline prospecting to strategic planning.
SDRs & AEs
Walk into every call knowing exactly which vendor your prospect is trialing, how far into evaluation they are, and when their decision window closes. No more cold prospecting into accounts that already chose someone else last month.
Learn more →Marketing & Demand Gen
Run campaigns timed to active evaluation windows - not just firmographic fit. Reach accounts when they're comparing options, not after they've already decided.
Learn more →Client Success & AMs
Know when a customer starts evaluating alternatives before they tell you. Catch churn risk at the signal stage, not the notice stage - and spot expansion windows when adjacent teams go in-market.
Learn more →Revenue Operations
Replace gut-feel territory planning with market signal data. Score accounts across your entire addressable market so forecast accuracy improves from day one - not quarter three.
Learn more →Common questions
The fast answers. Full detail on the FAQ page.
MarketSizer shows B2B software vendors which companies are actively in-market to buy their product, qualified by ICP fit, purchase intent, and win probability. Instead of guessing who to target, your team sees which companies are trialling your competitors right now, which recently churned from incumbents and are evaluating alternatives, and which match the profile of customers you historically win.
Your market is mapped.
Your opportunities are waiting.
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