v2 makes real people solve puzzles. v3 hands you a score from 0.0 to 1.0 and leaves the blocking, the fallback, and the review for you to build. Neither keeps any record of the real people it turns away. SpamKill decides after capture — 99.9% accuracy, invisible to real users, and nothing silently discarded.
Replace the puzzle, keep the protection: 99.9% accuracy with nothing for real people to solve — and every flagged submission is held for review, never silently deleted.
reCAPTCHA's whole model assumes human friction is acceptable. SpamKill's model is that humans should never be interrupted at all.
Every visitor is treated as a suspect and must pass a test to prove they're human. Real users waste time solving puzzles — and every visible challenge costs completions, most of all on mobile.
• Frustrating image puzzles ("select all traffic lights")
• Highest drop-off on mobile
• Fails users with visual/motor disabilities
• Solver services pass the puzzles for pennies
• Google tracking on every page load
SpamKill watches how visitors interact with your forms — timing, mouse movement, typing patterns, device signals — and blocks bots silently. Real users never see anything happen.
• Completely invisible — zero user interaction
• Zero conversion impact on mobile or desktop
• 100% accessible — nothing to solve
• 99.9% detection — behavior is the hardest thing to fake
• Flagged submissions held for review, never silently deleted
reCAPTCHA v3 never shows a puzzle. It watches the visit, returns a score between 0.0 and 1.0, and stops there. Everything after the score — the threshold, the block, the fallback for a real person who scores low, the review of what was turned away — is left for your team to build. Google's own guidance for low scores is to add your own verification step. That missing layer is the product you're evaluating on this page.
SpamKill is that missing layer, already built — and it replaces the score, not stacks on it. Flagged visitors verify themselves in one step; whatever doesn't verify is held for your review, never silently deleted. Once SpamKill protects the form, take reCAPTCHA off it: a gate in front of a capture-first filter keeps turning real people away before anything can recover them.
Same contact form, two kinds of protection. Switch the tabs and try to submit.
Running invisible v3? Your visitors skip the puzzle — see what v3 leaves unanswered above.
The rows that matter — starting with what happens when each one is wrong.
They work differently. reCAPTCHA decides before a submission exists — v2 with puzzles, v3 with a silent score — so when it's wrong there is nothing to recover and no record it happened. SpamKill decides after capture at 99.9% accuracy: real people are never interrupted, flagged visitors verify in one step, and every held submission is reviewable. The worst case with SpamKill is a review, not a lost lead.
Visible challenges add friction, and every added step costs some completions — the exact cost varies by audience and device. The less visible problem exists on both versions: neither v2 nor v3 keeps any record of the real people it turns away, so that cost never appears in any report.
No stacking needed — SpamKill replaces it at the form. v3 gives you a score before the submission exists; you still have to build the threshold logic, a fallback for misjudged real people, and any review of what was turned away. SpamKill works after capture: flagged visitors verify themselves in one step, and anything that doesn't verify is held for your review — never silently deleted. Run them side by side during the 30-day trial to compare — then take v3 off the form. We don't recommend keeping reCAPTCHA, or any gate, on a SpamKill-protected form: it keeps turning real people away before SpamKill can capture and verify them.
Yes. v2's puzzles are routinely passed by automated solvers and human solver farms for pennies per solve — a test a bot can outsource isn't a test of the bot. SpamKill analyzes behavior on the form itself — timing, movement, and device signals that can't be delegated — at 99.9% accuracy across 100M+ submissions.
reCAPTCHA is owned by Google and involves Google tracking. SpamKill has no third-party tracking and is designed with privacy by default.
Also compare SpamKill with:
Pull up a lead reCAPTCHA blocked last month. There's no such report — blocked means gone. With SpamKill it's a two-click view: what was held, why, and a button to let it through. Run the 30-day trial next to your existing setup, watch the queue yourself — then take the puzzle off for good. No card required.