For teams that pay for their leads

Your CAPTCHA has turned away more real prospects than it has ever told you about.

It has told you about none.

We'll get it wrong sometimes too. You'll get the lead back.

SpamKill is invisible form protection that decides after the form submits — nothing for real visitors to solve, 99.9% accurate across 100M+ submissions.

Start 30-day free trial Talk to Sales — 20 min

No credit card · Month-to-month after

100M+
submissions screened
99.9%
accuracy
1,500+
businesses
5 min
setup
Blocked lead review 3 held · today
[Name] · [name]@[company].com Awaiting review
example.com · held: behavior anomaly
[Name] · [name]@[company].com Awaiting review
example.com/signup · held: malicious email
[gibberish] · [gibberish]@[disposable].com Confirmed bot
example.com/contact-us · held: disposable email
Who never made it in — held, not lost.
Small business Small business or creator? Plans from $29, self-serve High-volume funnels Launch or conference funnels at scale? Talk about a pilot Agencies Managing forms for clients? Partner pricing
Why your CAPTCHA looks like it's working

A gate that guards the wrong door.

The bots it was hired to stop pay a solver farm pennies to pass it. So the gate lets the bots through and keeps the people out — and you pay at both ends.

What you never see

The squares appear when the CAPTCHA can't tell whether a visitor is human, and it settles the doubt by charging the human. Some solve it. The ones who don't never submit — the challenge gates the submit, so nothing left their browser. No lead. No conversion event. No name in any report.

What it costs, in your currencies
The click
You paid for the visit. The puzzle sent the prospect to whoever's next in the results.
The callback
Your reps are still calling numbers that were never real, and first response to the real prospects gets slower every week the queue fills.
The number you report
Bot conversions sit in your CPL denominator. The CAC you report is lower than the one you pay, and every optimization built on it scales the wrong campaigns.
One real lead you'd otherwise have lost pays for a year.
Check tonight

In GA4, compare form_start to form_submit on your paid landing pages. The gap has your gate's cost in it. What it will never show you is who.

One test for every option, SpamKill included: does a real person ever have to prove they're human — and if the tool is wrong, can you undo it?

Side by side
Your CAPTCHA
SpamKill
When it decides
Before the form submits
After the form submits
What a real visitor sees when it's unsure
The squares
One tap: a social or device sign-in
If they quit
Nothing captured, nothing logged
Submission held, with everything they typed
If it was wrong
Lost. No record it happened.
Held for 31 days — review it and put it back in play
What you learn
Nothing
Your flag tightens the filter
vs reCAPTCHA → vs Cloudflare Turnstile → vs hCaptcha → vs Akismet → vs OOPSpam → All the alternatives, stated fairly →
The first question every sales leader asks: "what if it blocks a real lead?"

How the opposite of a gate works.

01
We decide after the form submits, not before.
A gate decides before capture, so its mistakes vanish. We decide after, so the worst thing that can happen to a real lead is a review.
02
Bots and people see different forms.
Field names randomized every session, honeypots bots can't resist, and behavioral analysis of how the form was filled. Real visitors see a clean form — no widget, no badge, nothing to solve.
03
Doubt costs one tap. A mistake is undoable.
If we're unsure, the visitor gets one tap — a social or device sign-in. If they skip it, the submission is held with everything they typed, and you review it and put it back in play. Your flag tightens the filter.

Every filter gets it wrong sometimes. When your CAPTCHA gets it wrong, you'll see a number, never a name. When SpamKill gets it wrong, you get the lead back.

3 strictness levels you control Hands-on tuning on day 7 Full technical breakdown →
Sealed data

We check it. We lock it. We can't read it.

Holding a lead means storing it, so the leads we block are sealed with your key the moment we block them. Our engineers can't open them, and a stolen database contains nothing readable.

How the encryption works →
  • Sealed at block time — zero-access encryption
  • Decrypted only in your browser
  • Auto-deleted at 31 days · no backups
  • libsodium & Argon2id, audited primitives
Your stack

Drops into the CRM you already run.

HubSpot
Salesforce
HighLevel
Keap
ActiveCampaign
ClickFunnels
Kajabi
Attribution untouched
A verified lead reaches your CRM in its original format — pipeline stage, UTMs and hidden fields intact.
Conversions still fire
Google Ads and Meta see the same events — they're just real now.
Cloudflare stays
It protects the site, not the form — a different layer. The form gate comes out: one script in.
Integration details →
On the record

Named customers. No anonymous case studies.

Most growth teams find us through their network. Ask in your mastermind — someone there probably uses SpamKill already.

Small Business
"
I had a web form giving me upwards of 20 spam submissions a day. I followed the instructions and immediately my spam went completely to zero. Probably the most no-brainer, easiest solution for spam I've ever seen.
A
Anthony Casera
True Productions Media Services, Chicago
Business Owner
"
Very simple and effective tool that eradicates all bot signups and spam signups. Acts as a really good perimeter defence. Since installing SpamKill, we haven't had a single bad contact added. Very cost effective — does exactly what it says on the tin.
A
Adrian Savage
EmailSmart
Agency Partner
"
SpamKill has been how we "got in the door" and converted several prospects into clients. We install it free for a month — if we stop the spam, they switch to us. 100% success rate. Truly one of the best tools we have for getting new clients.
R
Richard Bueckert
Marketing Consultant
See all customer stories →
Prove it yourself · Threat Intel
We publish what we block.
The IPs, ASNs and patterns hitting forms, updated daily. See it before you trust us.
Open Threat Intel →
Prove it yourself · Form Transformer
Paste your form. Watch it transform.
Your real HTML through the production API, protected version handed back. No signup, no card.
Try the Form Transformer →
Who built this

We know what automation looks like on a form, because we spent years building it — for integrations, not spam.

Before APIs were common and before Zapier existed, connecting two business systems often meant building a web automation bridge: software that logs in, fills the form, clicks through and moves the data. We built those across industry platforms for years. A bot filling your form makes the same moves, and we know the moves. We also know that a puzzle is a solved problem for a bot and a wall for a tired human on a phone. Every gate makes the wrong one pay. So we built the opposite of a gate.

Our story → The technology →
100M+
Submissions screened
And counting
99.9%
Detection accuracy
Near-zero false positives
Patent-pending
Form transformation
Two realities, one form
4.9/5
on G2 · 11 reviews
Trustpilot 4.5 · Capterra 5.0
The 30-day free trial

Live before your next campaign. Your own data by day 7.

Day 1 — Install
Paste your form HTML, put the protected version on your site.
No backend changes, no dev sprint, no changes to your tracking.
Day 7 — Your first blocked-lead review, with us
This is where the headline shows up in your own data.
Real names your gate would have turned away, and the bots that would have been on your reps' call list.
Day 14 — Results
Bots held, real leads recovered.
And a cost per qualified lead you can put in front of the board.

No card. Month-to-month after. If the ROI isn't obvious by day 30, walk away.

Plans

Plans that scale with your pipeline.

Compare plans →
Professional START HERE $149 /month ~5,000 clean leads/mo · hands-on tuning · blocked-lead review MOST POPULAR Business $299 /month ~15,000 clean leads/mo · everything in Professional · unlocks ID Verification Scale $499 /month ~50,000 clean leads/mo · 10 seats · + Audit Intelligence

All three: blocked-lead review included · 30-day free trial, no card · spam never counts against your quota · first overage free, never a forced upgrade.

Small businessStarter $29 · Growth $59 — self-serve High-volume funnelsDedicated CSM, API, multi-domain — or 600,000+ leads/year · pilot program
Our commitment, in writing
Real submissions are never capped. A flagged real person verifies in one tap.
Every held lead is recoverable for 31 days, on every Growth Teams plan.
Held leads are sealed with a key only you hold; we can't read them, and they're gone after 31 days. How →
Your attribution, UTMs and conversion tracking are untouched.
Money back if we can't fix your spam.

Turn on held-lead review (you generate your own key at setup), and every held lead is kept for 31 days, sealed so only your password opens it.

See who's really in your pipeline — and who never made it in.

30-day free trial, no card. By day 7 you'll have a review queue you can read: real names, real companies, and the bots that would have been on your reps' call list.

Start 30-day free trial Talk to Sales — 20 min
Small business plans from $29 · High-volume funnels: pilot program · Agencies: partner pricing