MarketSizer & Cognism
Cognism is the compliance-first contact layer for European outbound. MarketSizer tells you which of those accounts just started shopping.
“Your No. 1 Choice in Premium Sales Intelligence.”
Source: cognism.com homepage
What each tool does well
Cognism
Best known for
A B2B contact-data platform with strong European coverage and a compliance-first posture built around GDPR, DNC and phone-verification workflows.
Useful for
Outbound teams selling into Europe and the UK where compliance and mobile-phone accuracy matter as much as record count.
MarketSizer
Best known for
Subscription intelligence - accounts ranked by observable buying events (trials, switches, renewals, churn).
Useful for
GTM teams that want a timing-signal layer on top of the contact-data source they already run.
Where Cognism is strong
- Strong European and UK contact-data coverage, particularly on mobile phones.
- Compliance-first posture - GDPR, CCPA, DNC alignment built into the workflow.
- Diamond-verified mobile numbers, the tier the company built its brand on.
- Native integrations with the major CRMs and sequencing tools.
- Chrome extension for in-workflow lookups.
- Well-suited to teams that need to defend the data source in enterprise procurement.
Where they differ
Different jobs on the same pipeline - the overlap between Cognism and MarketSizer is smaller than a feature list suggests.
| Feature | Cognism | MarketSizer |
|---|---|---|
| Data coverage | ||
| B2B contact database (email, phone) | Included | Email, phone and LinkedIn via built-in enrichment |
| European and UK mobile coverage | Strong | Mobile numbers via built-in enrichment |
| Historical subscription record per account | Not included | 70M+ records |
| Global country coverage | Included | Included |
| Signals | ||
| Sales-trigger events (hiring, funding, news) | Included | Via integrated data partners |
| Event-based subscription signals | Not included | Included |
| Signal explainability at the event level | Named trigger per event | Included |
| Compliance and procurement | ||
| Compliance workflow (GDPR, DNC) as a product feature | Included | Not included |
| DNC screening built in | Included | Not included |
MarketSizer pricing as published at marketsizer.io/pricing. Cognism details as published on their own site and public documentation, last checked 8 August 2026. Spotted something out of date? Tell us and we will fix it.
Where each tool earns its place
Lean on Cognism when
- European or UK outbound is your primary motion and mobile-phone coverage matters.
- Compliance and DNC alignment are gating criteria for procurement.
- You want contact data plus sales-trigger events (hiring, funding) inside one platform.
- Enterprise legal and privacy review is a serious hurdle in your buying cycle.
Add MarketSizer when
- You want observable buying events on top of the contact data you already have.
- Timing signals (trials, switches, renewals, churn) matter more than the contact-data layer.
- You want signals surfaced alongside HubSpot, Salesforce, LinkedIn and Apollo, not in a separate tool.
- You need a self-serve entry point that a mid-market team can adopt without a full procurement cycle.
How MarketSizer works with Cognism
Cognism supplies the compliant contact layer for European outbound; MarketSizer supplies the timing layer that says which of those accounts is changing vendors. Neither replaces the other - the account decision and the contact lookup are different steps of the same motion.
MarketSizer ranks the market
Subscription events across your categories surface the accounts trialling, switching or approaching renewal right now.
Cognism fills in the people
Phone-verified contacts and GDPR-conscious sourcing turn the flagged account into a reachable buying committee.
The CRM joins the two
Both tools write into a shared CRM such as HubSpot, so signal context and contact records meet on the same account.
Outbound runs on timing
Reps work the accounts with live events first, with a compliant route to every person they need to reach.
What buyers say about the category
Themes from GTM leaders currently evaluating tools in this space.
In European deals, Cognism tends to hold the contact-data seat for two reasons buyers state plainly: verified mobiles and a compliance story that survives legal review. Nobody we speak to is trying to unseat it. What they ask about is the layer Cognism does not claim to be - whose renewal is approaching, who just added a competing tool, who is trialling something new.
MarketSizer & Cognism - frequently asked questions
Is MarketSizer a replacement for Cognism?
For most teams, no. Cognism is a contact-data platform; MarketSizer is a timing-signal layer. Teams typically keep Cognism (or an equivalent) as the contact source and add MarketSizer for event-based buying signals.
How is MarketSizer different from Cognism's sales triggers?
Cognism triggers are broad event feeds - hiring, funding, news - mapped to contact-data records. MarketSizer signals are subscription events - a trial started, a vendor switched, a subscription renewing - attached to the underlying account event, not to a rolled-up score.
Which one is stronger in Europe?
Cognism's contact-data coverage is genuinely strong in Europe and the UK, particularly for mobile phones. MarketSizer's subscription-event dataset spans 140+ countries but the primary layer is not contact data; the two are complementary in a European outbound stack.
How do teams typically run Cognism and MarketSizer together?
Cognism supplies the contact data and compliance-cleared phone numbers; MarketSizer surfaces which of those contacts' accounts is in a buying window right now. Push MarketSizer-flagged accounts into a Cognism list, then sequence.
What does Cognism cost?
Cognism does not publish price points; plans are quoted per team, priced on user count and data-package tiers (per their pricing page, August 2026). MarketSizer is credit-based (see current plans), with no per-seat multiplier.
Does MarketSizer include phone numbers?
Yes, where available. MarketSizer can enrich phone and email details for the people inside a target account, alongside company-level signals. The proprietary layer is the subscription-event and buying-signal dataset, not a native contact database like Cognism's. Most teams still use Cognism or a similar tool as their primary contact source.
See how MarketSizer works with your Cognism stack.
30 minutes on your accounts, tailored to your ICP. We show which companies are trialling, switching or renewing right now, so you can see whether the timing signal changes what your team does next.
500 credit trial No credit card Live data, not a slide deck
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