MailerCheck vs SalesQL: Email Verifier or Email Finder?
Most "vs" pages pretend these two tools compete. They don't. Comparing MailerCheck to SalesQL is like comparing a dishwasher to a grocery store - one cleans what you already have, the other gets you what you need. MailerCheck verifies emails on your list. SalesQL finds emails you don't have yet. So the real question isn't which one wins. It's which one you actually need right now.
30-Second Verdict
- Choose MailerCheck if you already have a list and need to clean it, test deliverability, and monitor your domain's reputation.
- Choose SalesQL if you need to discover work emails and phone numbers from professional profiles and export them for outreach.
- Skip both if you want verified contact discovery and list hygiene in one tool. Prospeo handles finding and verifying at 98% email accuracy, roughly $0.01/email, with a free tier included.
What Each Tool Actually Does
MailerCheck is a verification and deliverability suite built by the MailerLite team. You upload a list or hit the API, and it runs syntax checks, MX lookups, SMTP verification, catch-all detection, and disposable domain filtering. On top of that, you get Email Insights (which scores your content for deliverability), Inbox Placement testing, DMARC monitoring, and blocklist alerts. It's purpose-built for email marketers protecting sender reputation - not for finding new contacts.
SalesQL is an email and phone finder focused on professional profiles. The Chrome extension pulls contact data across a database of 127M work emails, 89M personal emails, and 30M phone numbers. You can extract contacts in bulk, enrich CSVs, and push data to HubSpot or Salesforce. On G2, SalesQL holds a 4.5/5 from 166 reviews, with users praising the extension's speed. SalesQL also lists email sequences ("SalesQL Campaigns") as coming soon, which would make it a more complete outreach tool if it ships. One thing to watch: validation can take up to two minutes per profile, so factor that into bulk workflows.
Feature-by-Feature Comparison
| Feature | MailerCheck | SalesQL |
|---|---|---|
| Primary purpose | Email verification | Email/phone finding |
| Input | Email list or CSV | Professional profiles |
| Email verification | ✅ Full suite | ✅ Basic built-in |
| Phone numbers | ❌ | ✅ Paid plans only |
| DMARC/blocklist monitoring | ✅ | ❌ |
| CSV enrichment | ❌ | ✅ |
| Chrome extension | ❌ | ✅ |
| API | ✅ | ✅ |
| Key integrations | Mailchimp, Zapier, Make | HubSpot, Salesforce |
| Data refresh | N/A | Not disclosed |
Why pay for a finder and a verifier separately? Prospeo combines 300M+ profiles, 98% email accuracy, and 5-step verification - including catch-all handling and spam-trap removal - in a single workflow. No CSV exports, no manual uploads, no stale data between steps.
Find and verify in one click for roughly $0.01 per email.
Pricing
These tools charge for fundamentally different actions, so the credit math matters.
SalesQL uses a credit-per-profile model. One credit gets you emails and phone numbers for one contact:
| Plan | Price/mo | Credits/mo | Seats |
|---|---|---|---|
| Free | $0 | 100 | 1 |
| Basic | $39 | 2,000 | 1 |
| Professional | $79 | 5,000 | 3 |
| Organization | $119 | 12,000 | 15 |
Annual billing drops prices roughly 25% - Basic falls to $29/mo, Organization to $89/mo. Paid plans also bundle email verifier credits ranging from 5K to 20K depending on tier. One gotcha: if you cancel or switch plans, you can't revert to legacy pricing.
MailerCheck splits into two tracks. Verification is pay-as-you-go, starting at $0.01/credit with a 1,000-credit minimum. Each Inbox Placement or Email Insights test costs 200 credits. Monitoring is a separate subscription: $125/mo for 10 DMARC domains and 66 blocklist monitors, scaling to $975/mo for enterprise. Verifying 10,000 emails costs about $100 - that's cheap. But the moment you add DMARC monitoring, you're looking at $125-$275/mo on top of verification credits.
Accuracy and Coverage
SalesQL's retrieval rates sit at 70-80% for emails and 10-20% for mobile numbers. Those numbers are reasonable for a finder tool - no tool hits 100% - but G2 reviewers flag occasionally outdated data as a recurring issue. Detailed accuracy benchmarks against competitors like Apollo are scarce across Reddit recruiting forums. We always recommend testing a small batch before committing credits. If you're comparing more options, see our roundup of data enrichment services.
MailerCheck's verification covers syntax, MX, SMTP, catch-all, and disposable domains - thorough by any standard. But verification isn't a deliverability guarantee. One Reddit user paid $400 to verify 75K emails through MailerCheck and still hit a 50% soft bounce rate after migrating ESPs. The post was confounded by possible spoofing and reputation problems, but the lesson holds: verification reduces bounces, it doesn't control inbox placement. Sender reputation, DMARC/SPF/DKIM setup, and content quality all matter independently. For bounce benchmarks and fixes, see our guide to email bounce rate.
Here's the thing: if you're spending money on verification but haven't configured DMARC, SPF, and DKIM properly, you're solving the wrong problem first. Fix authentication before you clean a single list. If you want a deeper deliverability playbook, use our email deliverability guide and our checklist on how to verify DKIM is working.
What If You Need Both?
Stitching a finder and a verifier together works, but we've seen it introduce friction at every handoff. Export from SalesQL, upload to MailerCheck, clean, re-export, load into your sequencer - each step is a place where data goes stale or rows get dropped. For teams running high-volume outbound, that manual cycle eats hours every week. If you're building a repeatable process, map it to a lead generation workflow.
Prospeo eliminates that workflow entirely. It's a single platform for finding and verifying contacts: 300M+ professional profiles, 143M+ verified emails, 125M+ verified mobile numbers, 98% email accuracy, all on a 7-day refresh cycle. Its proprietary 5-step verification process includes catch-all handling, spam-trap removal, and honeypot filtering - so you're not bolting a separate cleaning tool onto your finder. Pricing starts at roughly $0.01/email with a free tier of 75 emails and 100 Chrome extension credits per month. If you're evaluating other databases, compare options in our sales prospecting databases guide.
Let's be honest - the reason most teams end up needing both a finder and a verifier is that their finder's data quality isn't good enough on its own. When your email accuracy is 98% out of the gate, the "clean it separately" step mostly disappears. For more ways to source leads without overpaying, see our list of free lead generation tools.
SalesQL's data refreshes on an undisclosed cycle. MailerCheck can't tell you if a contact changed jobs last week. Prospeo refreshes all 300M+ records every 7 days - the industry average is 6 weeks - so your outbound hits real inboxes, not dead ends.
Get 75 free verified emails monthly and ditch the two-tool workflow.
FAQ
Can I use MailerCheck and SalesQL together?
Yes. Use SalesQL to find emails, export as CSV, then upload to MailerCheck for verification. It works but doubles your cost and adds manual steps. An all-in-one platform handles finding and verifying in a single workflow, cutting out the export-import cycle entirely.
Is SalesQL accurate enough for cold outreach?
SalesQL retrieves emails for 70-80% of profiles, which is solid for a finder tool. G2 reviewers note occasional outdated data, so always run a verification pass before sending. For comparison, Prospeo's 7-day data refresh cycle keeps records current - the industry average is six weeks.
Does MailerCheck guarantee inbox placement?
No. Verification reduces bounces by filtering invalid addresses, but inbox placement depends on sender reputation, authentication setup (SPF, DKIM, DMARC), and email content. MailerCheck's Inbox Placement testing can diagnose issues, but it's a separate paid feature at 200 credits per test.