AppSumo Radar beta
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Highest accuracy at the lowest cost

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Find the emails in bulk with CSV
Single and Bulk Verification
Finding and verification API
Outbound skill library

Mailsfinder

Micro-SaaS
-76%$29
$120
  • Lifetime access
  • Refundable up to 60 days
No "We Got Your Back" guarantee. Radar is a discovery engine — we don't vet these products, so this guarantee doesn't apply.
AppSumo's 60-day refund applies to most deals. AI skills are non-refundable once redeemed.
AppSumo Labs

Early-stage product. Brought to you by the team who built it.

Email finders and verifiers charge a lot per address and still let bounces through. Mailsfinder is the most affordable tool on the market and verifies at 99% accuracy.

TL;DR

  • checkmarkFind and verify emails at 99% accuracy for a fraction of what other tools charge
  • checkmarkAdd the API, 20 outbound skills and a 14-day outbound challenge on the higher tiers

At-a-glance

mailsfinder.com

Alternative to

Apollo, Hunter.io, ZeroBounce

Integrations

Google Sheets, Make, Rest API, n8n

Best for

Marketing agencies, Sales managers, Founders

What this is for

Bulk finder with advanced search

  • Upload 10,000 names and domains at once
  • Checks 1,000+ patterns per domain to find the current business email
  • Every row comes back marked found, catch-all or not found
Bulk finder with advanced search

99% verification accuracy

  • RFC checks, MX lookup and a direct SMTP handshake on every address
  • Catch-all domains reported as their own status, never passed off as valid
  • A diagnostics report with quality score, MX host and provider
99% verification accuracy

API and automations

  • REST API for the finder and the verifier on Tier 3 and Tier 4
  • Async bulk endpoint for large jobs, Make and n8n connectors
  • 200ms average latency
API and automations

Outbound skills that book meetings

  • Tier 3 includes 3 Claude Code skills: ICP builder, prospect research and cold email writer
  • Tier 4 includes the full library of 20 skills, from subject lines to follow-up sequences and deliverability audits
  • Each skill ships with a plain-English playbook, and Tier 4 adds the 14-day outbound challenge in the Discord community
Outbound skills that book meetings

Choose the plan that’s right for you

Feel secure in your purchase with AppSumo's 60 day money-back guarantee.

Refundable up to 60 daysNot covered by We Got Your Back. Why?
Deal terms & conditions
Mailsfinder
See Mailsfinder
Founded June 1, 2025
🇮🇳India
1-10
Startup
Bootstrapped

Why we built Mailsfinder

Hey Sumo-lings,

If you have ever paid for one tool to find an email and another to verify it, you already know the pain. When you run outbound for several clients, those separate credits, limits and subscriptions add up fast.

We built Mailsfinder to make that part simpler. You find and verify emails from the same credit balance, so you are not paying two vendors to build one clean prospect list.

Mailsfinder checks the address, confirms whether it can accept mail, and flags catch-all domains instead of quietly calling everything valid. The higher tiers also come with an API, so you can plug verification into the workflows you already use.

We are not going to pretend we have built everything the big platforms have. Mailsfinder is young, our team is small, and there is still plenty on the roadmap.

What we have focused on is the part that matters most: find the right address, verify it, and get the result where you need it.

The top two tiers also include our outbound skills, and Tier 4 adds the 14-day challenge from our own community, because a clean list is only useful if you know what to do with it.

Grab the lifetime deal, put Mailsfinder through your toughest lists, and tell us what you build with it.

Harsh Shah
Founder & CEO

What “Radar” means for this product

Learn more about AppSumo deals

Radar is home to early-stage products looking to gain traction. Here’s the lowdown of what these deals are and aren’t.

Where it is in its life

Radar products are at the start of their journey. They're fresh on the scene and building a customer base.

How we vouch for it

We've verified the basics and reviewed the listing for safety. Success isn't guaranteed — we haven't fully vetted every claim, feature, or result.

Code & security review

All AI skills are reviewed for security purposes. We do not review software code — partner owns security and what ships.

Refund policy

60-day refund on most deals. AI skills are non-refundable once redeemed.

Pricing

Prices are set by the founder. Simple as that.

Where you'll see it

The Radar section of our site exclusively. These products are in early discovery and not quite ready for the AppSumo limelight yet.

Radar is a discovery engine — because we aren’t vetting these products, our We Got Your Back guarantee doesn’t apply. Should these products show traction, our team will work with theirs to get them ready for the main stage (and protected).

Questions & reviews