ListClean vs Prospeo: Email Verifier vs B2B Data Platform
Comparing ListClean to Prospeo is like comparing a spell-checker to a word processor. One validates what you already have. The other builds the list, verifies it, enriches it, and syncs it with your outbound stack.
The existing comparison pages on SourceForge are empty shells with zero editorial substance. We've used both tools, and the category difference becomes obvious within minutes.
30-Second Verdict
- Use ListClean if you already have an email list and need cheap, fast verification before hitting send.
- Use Prospeo if you need to find verified emails, enrich contacts with 50+ data points, and build prospect lists from scratch.
- Use both if you want maximum deliverability - Prospeo to find and verify, ListClean as a $5 secondary pass on 10K emails before loading into your sequencer.
What Is ListClean?
ListClean is a dedicated email verification tool - nothing more, nothing less. You upload a CSV or XLSX, it runs SMTP checks, MX/DNS validation, spam-trap detection, catch-all handling, disposable and role-based filtering, then hands you a cleaned file. That's the whole product.
Pricing is dead simple: pay-as-you-go credits that never expire. $5 for 10K verifications, $99 for 500K, and $149 for 1M. Unknown results don't cost you anything. Throughput runs up to 100K emails per hour.
Review scores are consistently strong - 4.7/5 across G2 (135 reviews), 4.8/5 on Capterra (64 reviews), and 4.8 on Trustpilot (55 reviews). One Trustpilot reviewer reported going from 40% hard bounce to 10%. Over on r/coldemail, a user posted a 0.84% bounce rate after cleaning with ListClean for under $5.
The tradeoffs: no live chat support, limited native integrations (API-first, with a documented Clay workflow), and no email finding or enrichment capabilities whatsoever.
What Is Prospeo?
Prospeo is a B2B data platform that finds, verifies, and enriches contacts in one workflow. The database covers 300M+ professional profiles, 143M+ verified emails, and 125M+ verified mobile numbers, all refreshed on a 7-day cycle versus the six-week industry average.
Every email goes through a 5-step verification process - SMTP checks, catch-all handling, spam-trap removal, honeypot filtering - before it reaches you. The result is 98% email accuracy and a 92% API match rate. Meritt, a customer, tripled their pipeline from $100K to $300K/week and dropped their bounce rate from 35% to under 4%.
Beyond verification, you get 30+ search filters including buyer intent powered by Bombora, technographics, job change signals, and headcount growth data. Native integrations cover Salesforce, HubSpot, Smartlead, Instantly, Lemlist, Clay, Zapier, and Make. Pricing starts at roughly $0.01 per email, with a free tier and paid plans from $39/mo. No contracts, no sales calls.
Why pay for a separate finder and a separate verifier? Prospeo searches 300M+ profiles, verifies every email through a 5-step process, and enriches contacts with 50+ data points - all in one step. Meritt dropped their bounce rate from 35% to under 4% and tripled pipeline.
Replace two tools with one platform at $0.01 per verified email.
Feature-by-Feature Comparison
| Feature | ListClean | Prospeo | Edge |
|---|---|---|---|
| Category | Email verifier | B2B data platform | Prospeo (broader) |
| Email Finding | No | Yes - 300M+ profiles | Prospeo |
| Email Verification | Yes - bulk CSV/XLSX | Yes - built-in, multi-step | Tie |
| Mobile Numbers | No | Yes - 125M+ verified | Prospeo |
| Data Enrichment | No | Yes - 50+ data points | Prospeo |
| Integrations | API + Clay | Salesforce, HubSpot, Smartlead, Instantly, Lemlist, Clay, Zapier, Make | Prospeo |
| Data Freshness | Verify on upload | 7-day refresh cycle | Prospeo |
| Pricing Model | Pay-as-you-go credits | Monthly plans + free tier | ListClean (simpler) |
| Starting Price | $5/10K verifications | $39/mo | ListClean (cheaper entry) |
| Best For | Cleaning existing lists | Building + verifying lists | Depends on workflow |
When to Use Which
ListClean wins when you just exported 5,000 leads from a webinar and half the emails are probably dead. You don't need to find anyone new. You need to clean what you've got before your next campaign tanks your sender reputation. ListClean handles this for a few dollars.
Prospeo wins when your SDR team needs 500 new prospects this week and you're starting with nothing but a target ICP. You need to find emails, not just verify them - search by job title, company size, intent signals, and technographics, then get verified emails and direct dials in one step. (If you're still building your process, start with a simple lead search workflow.)
Use both when you're sending 50K+ cold emails per month. We've run both tools side by side, and the workflow is straightforward: Prospeo finds and verifies, then you run the exported list through ListClean as a $5 secondary pass before loading into your sales sequence metrics. At that price, it's cheap insurance against a domain reputation hit.
Here's the Thing
If you're running deals under $10K and cobbling together a free email finder plus a separate verifier plus a separate enrichment tool, you're spending more time stitching tools together than actually selling. We see this constantly. A single platform that handles all three steps saves more money than the "cheaper" point tools ever will - and it saves your ops team from building duct-tape integrations that break every quarter.
If you want a broader view of the category, start with our breakdown of data enrichment services and email deliverability issues.
Final Verdict
These tools aren't competitors. They're different categories.
ListClean is excellent at what it does: fast, cheap email verification with strong user ratings. But if you're spending $5 to verify emails you found somewhere else, ask yourself why you're not using a tool that finds AND verifies in one step.
When comparing ListClean vs Prospeo, the real question is whether you need a verifier or a full data platform. For teams sending 10K+ cold emails monthly, Prospeo replaces both your finder and your verifier for less than you'd spend on two separate tools. Start there, and add ListClean as a secondary pass if your volume demands it. (For more options, see our guide to the best email cleaner tools.)
Running ListClean as a secondary pass makes sense at 50K+ emails/month. But your primary source matters more. Prospeo delivers 98% email accuracy with 7-day data refresh - so there's less to clean in the first place. 15,000+ companies already made the switch.
Start with cleaner data and stop paying twice to get it right.
FAQ
Is ListClean accurate?
ListClean holds 4.7/5 on G2 and 4.8/5 on Capterra, with users consistently reporting bounce rates under 1%. One Reddit user hit 0.84% for under $5. That said, catch-all domains remain a challenge for every verifier on the market, and top tools still cluster around ~70% overall accuracy when unknown outcomes are included.
Does Prospeo verify emails or just find them?
Both. A 5-step verification process runs automatically on every email found - SMTP checks, catch-all handling, spam-trap removal, and honeypot filtering. You pay only for verified addresses. The 98% accuracy rate means most teams don't need a separate verifier at all.
Can I use ListClean and Prospeo together?
Yes, and it's the recommended workflow for high-volume senders. Use Prospeo to find and verify, then run the exported list through ListClean as a secondary pass before loading into your sequencer. At $5 per 10K verifications, it's cheap insurance for campaigns exceeding 50K emails per month.
What's a good free option for email verification?
Prospeo's free tier includes 75 verified emails and 100 Chrome extension credits per month - enough to test accuracy on real campaigns. ListClean doesn't offer a free tier, but its $5/10K entry point is effectively negligible for most teams.