by Matthias Nordwig
4.9 (48 reviews)
Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms
Invisible spam protection for every form, login and checkout. No puzzles, no checkboxes, no lost visitors — a CAPTCHA your users never see.
Compatible with WP 7
v5.0
Current Version v5.0
Updated 1 week ago
Last Update on 16 Jul, 2026
Refreshed 12 hours ago
Last Refreshed on
Rank
#3,552
—
No change
Active Installs
4K+
-8.5%
KW Avg Position
29.4
-0.2 better
Downloads
53.5K
+29 today
Support Resolved
25%
—
No change
Rating
98%
Review 4.9 out of 5
4.9
(48 reviews)
Next Milestone 5K
4K+
5K+
257
Ranks to Climb
-
Growth Needed
8,000,000
Active Installs
Pro
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Rank Changes
Current
#3,552
Change
Best
#
Downloads Growth
Downloads
Growth
Peak
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Upgrade NowReviews & Ratings
4.9
48 reviews
Overall
98%
5
47
(98%)
4
0
(0%)
3
0
(0%)
2
0
(0%)
1
1
(2%)
Tracked Keywords
Showing 5 of 5| Keyword | Position | Change | Type | Updated |
|---|---|---|---|---|
| anti-spam | 17 | — | Tag | 17 hours ago |
| spam protection | 24 | — | Tag | 17 hours ago |
| recaptcha | 31 | — | Tag | 17 hours ago |
| spam | 34 | — | Tag | 17 hours ago |
| captcha | 41 | — | Tag | 17 hours ago |
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Support Threads Overview
Resolved
Unresolved
4
Total Threads
1
Resolved
3
Unresolved
25%
Resolution Rate
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Start Tracking FreePlugin Details
- Version
- 5.0
- Last Updated
- Jul 16, 2026
- Requires WP
- 4.8+
- Tested Up To
- 7
- PHP Version
- 7.1 or higher
- Author
- Matthias Nordwig
Support & Rating
- Rating
- ★ ★ ★ ★ ★ 4.9
- Reviews
- 48
- Support Threads
- 4
- Resolved
- 25%
Keywords
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Frequently Asked Questions
Common questions about Invisible Anti-Spam & CAPTCHA — reCAPTCHA Alternative for All Forms
Yes. For the kind of spam that plagues almost every site — automated, mass-sent — the typical experience after activation is that it simply stops: every message now costs the sender real computing power, which breaks the economics of sending thousands of them. That result has held up across years of production use. And the protection is actively maintained: when a new generation of protocol-aware bots learned to reuse a solved challenge across many submissions, version 5.0 closed that route with single-use, signed tokens. For the rare rest — targeted spam written by humans — the flag-and-inbox workflow keeps you in control instead of promising magic.
No. There is nothing to see, click or solve. The proof-of-work runs in the background while the visitor fills in the form and is typically finished in milliseconds — long before they hit Send.
No. Unlike reCAPTCHA, hCaptcha or Turnstile there is no external service involved — no keys, no registration, no third-party scripts, no rate limits.
No. The plugin ships a few kilobytes of JavaScript, loads no external resources and causes no layout shift. The computation happens on the visitor's device in the background; the server-side check is a single fast lookup.
Yes. The challenge token is fetched via Ajax at runtime, so fully cached pages stay protected. One thing to know: right after installing or updating, clear your page cache once so the plugin's JavaScript is included everywhere.
All public forms — including hand-coded and custom ones. The plugin recognizes submissions by their signature (the request's characteristic fields and actions) instead of integrating with specific form plugins, so it is not limited to a fixed list. WordPress core, WooCommerce and the several dozen builders listed above come pre-configured; any other form is added without code in under a minute via direct analysis mode: submit it once, click save.
Everything stays on your server: no cookies, no sessions, no tracking, no external requests. IP addresses are only stored as SHA-256 hashes, and password fields are never stored with saved messages. That means no consent banner is needed for the spam protection — friendly to GDPR (DSGVO, RGPD) and similar privacy laws.
Yes: checkout, login, registration, password reset, comments and product reviews are covered out of the box.
Every submission has to pay for itself with a small proof-of-work computation. This makes mass spam economically expensive and silently filters out low-effort bots — the vast majority of spam. Like any anti-spam solution (including CAPTCHAs), it cannot fully prevent targeted, low-volume spam sent by a determined human or a bot that invests real computing power per message; for those rare cases, use the flag-instead-of-block option and the spam inbox to keep an eye on what comes through. Submissions are incorrectly treated as spam Right after installation this is usually a caching issue: the proof-of-work JavaScript is not yet included in cached pages. Clear the cache on your webserver (or caching plugin) and in your browser. JavaScript might crash due to an incompatibility with another plugin. Press F12 on the affected page and check the browser console for errors — and please report the issue in the support forum; such reports are usually addressed within a day. Neither messages nor spam show up in the inbox Activate the Analysis mode Submit the affected form and look for the captured entry in the Analytic Box Open the entry and add it to the protection scope If the submission does not appear there either, please post in the support forum Problems with Borlabs Script Blocker
Check the browser console (F12) on the problematic page for messages Post in the support forum with as many details as possible — issues are usually fixed quickly If the protection does not work on a specific form, a short note with the form plugin's name is enough to get it looked at