Generect vs Mails.so: Lead Finder vs Email Verifier
Comparing Generect to Mails.so is like comparing a fishing rod to a fish scaler. One finds leads; the other cleans a list you've already got. They solve different problems, and we've spent time digging into both so you can figure out which one actually fits your workflow.
30-Second Verdict
Generect is a lead discovery engine with built-in email verification. Use it if you need to find new contacts.
Mails.so is a standalone email validation service. Use it if you already have a list and need to scrub it before sending.
Here's the thing: paying for a standalone verifier when your lead finder already includes verification is wasting budget. If you're doing any outbound prospecting, Generect is the obvious pick over Mails.so. And if you want one platform that finds leads, verifies emails, and provides mobile numbers, Prospeo handles all three without stitching tools together.
What Each Tool Does
Generect
Generect is a real-time B2B lead search engine. You run a search, it finds contacts on the fly rather than pulling from a static database, and every email gets verified before export. The pay-as-you-go model charges $0.03 per valid email and $0.02 per export - no subscription required.
On G2, it holds a 5.0/5 rating from 32 reviews. Users call out data accuracy and speed as top strengths, though some note the reporting features feel thin. The platform includes CRM sync and API access.
Mails.so
Mails.so is a pure email validation service. It runs format checks, delivery checks, blocklist screening, and email profiling - the standard verification stack. It's API-first, GDPR compliant, and connects to HubSpot, Salesforce, and Pipedrive through Zapier and Make. You get 50 free credits to start.
The product is built for developers and marketers who already have email lists and need to reduce bounces. It doesn't find leads. It doesn't provide phone numbers. It validates what you already have.
Feature-by-Feature Comparison
| Feature | Generect | Mails.so | Winner |
|---|---|---|---|
| Lead discovery | ✅ Real-time search | ❌ | Generect |
| Email verification | ✅ Built-in | ✅ Core product | Mails.so (purpose-built) |
| Phone numbers | ✅ Verified phone numbers | ❌ | Generect |
| CRM integrations | Native CRM sync | Via Zapier/Make | Generect |
| API access | ✅ | ✅ | Tie |
| Pricing model | Pay-as-you-go | Subscription | Depends on volume |
Generect covers the full top-of-funnel workflow - find, verify, export. Mails.so handles one step: validation. If you're building lists from scratch, Generect does more. If you're cleaning an existing database, Mails.so is purpose-built for that single job.
Generect charges $0.03 per email. Mails.so charges extra just to verify. Prospeo finds leads, verifies emails at 98% accuracy, and returns mobile numbers - all for ~$0.01 per email. One platform, no middleware, no data handoff errors.
Replace two tools with one that costs less and does more.
Pricing Breakdown
| Volume | Generect | Mails.so |
|---|---|---|
| 1K emails | ~$50 (discovery + verification) | Free tier covers 50 |
| 10K emails | ~$500 (discovery + verification) | $48/mo Pro plan |
| 50K emails | ~$2,500 (discovery + verification) | $98/mo Business |
Generect's cost includes finding the leads and verifying them. Mails.so's pricing is verification-only - you still need to source those emails from somewhere else, which adds cost.
Generect's unit pricing stays flat as volume increases, while Mails.so's effective per-email cost drops at higher tiers: $0.0048/email on Pro (10,000 included for $48) vs. $0.00196/email on Business (50,000 included for $98). Mails.so also offers an Unlimited plan at $498/mo and Enterprise at $1,899/mo.
One thing that bugged us: Mails.so's pricing varies across their own site. On the homepage, Pro is shown as $4.80 per user/month, while comparison pages list Pro at $9.60 per user/month. Not a great look for a tool that's supposed to be about precision.
Accuracy and Reliability
Generect promotes a 98% email validity rate, and G2 reviewers consistently back that up - data accuracy is the most-cited strength across reviews. No direct head-to-head comparisons exist on Reddit or community forums yet, which makes sense given how different these tools are.
Mails.so lacks independent benchmark data. One Reddit user reported that the tool flagged their own email as "undeliverable" - a clear false negative. A Truelist competitor page also positions Mails.so as having inconsistent validation accuracy and slower performance on larger lists.
Neither tool appears in the LeadMagic 10-tool benchmark test where top verifiers scored between 95.8% and 99.5%. Catch-all domains - roughly 28% of B2B lists in that benchmark dataset - remain the primary accuracy killer across all verifiers. That's worth remembering no matter which tool you pick.
If you want a deeper breakdown of list hygiene and deliverability, see our guide to managing email lists and how to run a proper blacklist checker.
When to Use Which
Use Generect if you need to find new leads and want verification baked into the discovery process. One tool, one workflow, one bill.
Use Mails.so if you already have email lists from other sources and just need to clean them before launching sequences. It's a solid pick for dev teams validating form signups, but for sales teams doing outbound, you'd get more value from a platform that handles discovery too.
Skip both if you want lead discovery, email verification, and mobile numbers in a single platform. Stitching together a lead finder plus a standalone verifier creates friction, costs more, and introduces data handoff errors that a unified tool avoids entirely.
What If You Need Both?
Let's be honest - most outbound teams need both discovery and verification, and running two separate tools for that is a headache we've seen too many times.
Prospeo combines a 300M+ lead database with 30+ search filters, real-time email verification at 98% accuracy, and 125M+ verified mobile numbers. Every record refreshes on a 7-day cycle, compared to the 6-week industry average at most competitors. Credit-based pricing runs ~$0.01 per email - a fraction of what you'd pay combining Generect and a separate verifier. Native integrations with Salesforce, HubSpot, Instantly, and Lemlist mean leads flow straight into sequences without middleware.
If you're evaluating other data vendors in the same category, it can help to compare against Clearbit alternatives and broader sales prospecting databases.
We've seen teams like Snyk cut bounce rates from 35-40% down to under 5% after switching, while generating 200+ new opportunities per month. That's the difference between a cobbled-together stack and a single platform built for the job.
Catch-all domains kill accuracy across every verifier. Prospeo's 5-step verification with catch-all handling, spam-trap removal, and honeypot filtering is why teams like Snyk dropped bounce rates from 35% to under 5% - while sourcing 200+ opportunities per month from the same platform.
Stop guessing which emails will bounce. Get 98% accuracy from the start.
FAQ
Is Mails.so accurate?
No independent benchmark data exists for Mails.so. A Reddit user reported a false "undeliverable" result on their own valid email. Top-tier verifiers in benchmark tests score 95.8%-99.5%, and without third-party testing it's hard to place Mails.so on that spectrum.
How does pricing compare at scale?
At 10K emails, Generect costs roughly $500 with lead discovery and verification included, while Mails.so's Pro plan runs $48/mo for verification only. The catch: Mails.so doesn't source leads, so you'll pay a separate tool on top. Factor in total stack cost, not just the verifier line item.