LeadIQ vs Mattermark: One Is Dead - What to Use in 2026

LeadIQ vs Mattermark: One Tool Is Dead - Here's What to Use Instead

This comparison is dead on arrival. Mattermark was acquired by FullContact for less than $1 million in 2017 - with less than $500K in cash, essentially to cover shutdown costs. Its G2 profile hasn't been active for over a year and has zero reviews.

So this isn't a head-to-head. It's a redirect.

LeadIQ is alive and actively used, but it has well-documented data quality issues that matter if you're building outbound campaigns. Let's break down what's actually worth your time.

30-Second Verdict

Use LeadIQ if you need a browser-based prospecting tool with fast CRM export and you primarily care about email capture. It carries a 4.2/5 on G2 across 1,160 reviews - real traction with real users.

Skip LeadIQ if phone number accuracy matters to your workflow. G2 reviewers flag inaccurate phone numbers in 40 separate mentions. At 10 credits per phone number on the Pro plan, that's expensive disappointment.

Skip both if you want accurate B2B contact data without credit caps or data freshness concerns. Prospeo delivers 98% email accuracy on a 7-day refresh cycle, covers 125M+ verified mobiles, and starts free with no annual contracts.

What Happened to Mattermark?

Mattermark was built for startup and private-company intelligence. It tracked growth signals and funding activity across 4 million companies, including employee growth and other momentum indicators that investors cared about.

It offered a Salesforce integration with 80+ company fields, a Chrome extension, and API access - features now standard in tools like Crunchbase and PitchBook. In December 2017, FullContact acquired Mattermark in what TechCrunch described as a liquidation, bringing 4M companies and 20M+ contacts into FullContact's identity graph. Six Mattermark employees came along.

The founders later announced a re-launch focused on private deal intelligence. The Mattermark website still shows pricing and a 2026 copyright, but the G2 profile is flagged as inactive with zero reviews. That tells you everything you need to know.

LeadIQ: What Users Actually Say

LeadIQ is a Chrome extension-first prospecting tool built for capturing contact data from professional profiles and pushing it straight into your CRM or sequencer. What works well:

• The Chrome extension workflow is genuinely easy - 129 G2 mentions praise ease of use
• Export/sync into common sales tools is a core strength, with 92 mentions for efficient contact export
• Champion tracking for job changes is a useful signal feature

What doesn't:

• Data accuracy is the #1 complaint - 72 G2 mentions flag inaccurate data, missing emails, or sync issues
• Phone numbers cost 10 credits each and draw 40 G2 complaints for being inaccurate
• Pro starts at $200/month, and credits drain fast if you're pulling mobile numbers

We've tested LeadIQ's Chrome extension workflow extensively, and it's among the smoothest in the category. The data quality is what holds it back. One thing to note on pricing: G2 still shows older seat-based pricing ($45-$89/seat/month), but LeadIQ's current official pricing page uses a credit-based model starting at $200/month for Pro.

Side-by-Side Feature Comparison

Here's the thing: these two tools never really competed. Mattermark tracked company-level growth signals for investors. LeadIQ finds contact information for outbound reps. If you landed on this comparison, you're probably looking for a prospecting tool - so let's focus there.

What to Use Instead

Sales Prospecting

If you need verified contact data for outbound, Prospeo is the strongest option for B2B contact accuracy right now. The database covers 300M+ professional profiles with 143M+ verified emails and 125M+ verified mobile numbers, all refreshing on a 7-day cycle - while most competitors refresh every 4-6 weeks. Pricing works out to roughly $0.01 per email with no annual contracts, and the free tier gives you 75 emails and 100 Chrome extension credits monthly.

Apollo is worth a look too - the free tier is generous, and paid plans start around $49/month. But we've seen Apollo's email accuracy run noticeably lower in head-to-head tests, which matters when your domain reputation is on the line. One bad batch of emails can tank your sender score for weeks.

Real talk: if your average deal size sits below $10K, you almost certainly don't need ZoomInfo-level tooling ($15K-$40K/year). A focused prospecting tool with accurate data will outperform an enterprise platform your team barely logs into.

Startup & VC Intelligence

This is what Mattermark actually did, and the modern replacements are solid. Crunchbase runs about $29/month for individual Pro users and covers the basics well. PitchBook handles enterprise needs at $20K-$50K+/year. For deeper private market coverage, Dealroom and Tracxn also fill the gap Mattermark left behind.

Data Enrichment

For enriching existing CRM records or CSV lists, Clay (~$149/month) lets you stack multiple data providers in a waterfall approach. Pair it with Prospeo as your primary email/phone source for the best accuracy-to-cost ratio - the 92% API match rate means fewer gaps in your enrichment workflows.

FAQ

Is Mattermark still active in 2026?

The website is live and the founders announced a re-launch after the FullContact acquisition, but the G2 profile has zero reviews and hasn't been active for over a year. For startup intelligence, Crunchbase and PitchBook have largely absorbed that market.

Is LeadIQ worth $200/month?

It works well for teams that primarily need emails captured from professional profiles - the Chrome extension UX is excellent. If phone accuracy matters, the 40 G2 complaints about inaccurate numbers are a real red flag. Test it on a free plan before committing.

What's the most accurate alternative for B2B contact data?

Prospeo delivers 98% email accuracy at roughly $0.01 per email with no contracts, plus 125M+ verified mobiles with a 30% pickup rate. The free tier lets you validate before spending anything.