The CAPTCHA alternative that actually works.
Vinishu swaps CAPTCHA for invisible bot detection - one verify call inside your application, an answer in 8–10 ms. Bots get blocked. Real users never see a puzzle.
What is a CAPTCHA-free anti-bot solution?
A CAPTCHA-free anti-bot solution tells real users from bots without ever showing them a task. Instead of puzzles, it scores signals a browser can't fake on demand - TLS fingerprints, header order, timing, behavior - and rules out automated traffic before your application answers.
Vinishu does this in the verify call: your application asks once, and the answer is back in 8–10 ms - inspected, scored, decided. Real users never see a test. Bots never get anything out of your app.
Every CAPTCHA challenge costs you a customer.
CAPTCHA was built for a different web. In 2026 it punishes the exact users you want to keep - and bots cracked it long ago.
Friction at the moment of conversion
The CAPTCHA pops up right when the user is about to submit - checkout, signup, login. The mental load and the delay hit you exactly where you can least afford it.
3–38% conversion drop-off
Stanford and Cloudflare research shows it again and again: CAPTCHAs drop form-completion rates by 3% (best case) to 38% (worst case). Multiply that across your funnel.
Hostile to assistive technology
Image and audio CAPTCHAs are notoriously inaccessible. Screen-reader users bail constantly. WCAG 2.2 compliance turns into a permanent workaround.
Broken on small viewports
Tap targets are too small, audio fallbacks almost never work on mobile, and the modal keeps clipping behind the iOS keyboard. Mobile-first and CAPTCHA - those don't go together.
Bots solve them anyway
Per-solve services crack visual CAPTCHAs at 99%+ accuracy for under $0.001 a puzzle. Expensive for humans, basically free for a determined bot.
Sources: Stanford CAPTCHA usability study (PDF) · Cloudflare research on CAPTCHA time cost
CAPTCHA vs Vinishu.
| Metric | CAPTCHA | Vinishu |
|---|---|---|
| False positive rate | 5–8% on average (CMU + Cloudflare studies) | Every block is traceable by fingerprint_id and session_id |
| Latency added to legitimate request | 5–30s (challenge solve time) | 8–10 ms (synchronous decision, no challenge) |
| Mobile UX | Tap and squint, often broken on small viewports | Invisible - nothing to render |
| Accessibility (WCAG 2.2) | Image-based, hostile to screen readers | Compliant by default - no challenge to fail |
| Engineering effort | Per-form integration + fallbacks + bypass detection | One SDK import - the reverse-proxy hop comes later |
| Conversion-rate impact | −3% to −38% (Stanford / Cloudflare 2023) | No friction added - there is nothing to solve |
Three steps. No puzzles.
Inspect in the verify call
Your route hands the request to Vinishu once, before your database does any work. We read TLS handshake metadata, headers, request shape and IP reputation.
Score against learned signals
Behavioral signals plus the signed session from the script tag add up to a score - proof that a real browser rendered your page. The answer carries no reasoning. It carries fingerprint_id and session_id, and those are how you look a decision up in the dashboard.
Decide in 8–10 ms
Vinishu answers with valid and score. The threshold sits in your route - pass, throttle or block. Real users feel nothing. Bots get nowhere.
Is Vinishu really CAPTCHA-free, or do you fall back to a CAPTCHA sometimes?
Truly CAPTCHA-free. Vinishu decides synchronously, inside the verify call your application makes - from TLS metadata, headers, request shape, behavioral signals, and a signed session from the script tag. There's no fallback challenge: we answer with valid and score. Your route passes, throttles or blocks. We never show an interstitial. The script tag renders nothing in the browser for it.
How is this different from invisible reCAPTCHA?
Invisible reCAPTCHA still throws a challenge when its confidence is low - right at the moment of action (form submit), so it's maximally disruptive. Vinishu decides in the verify call, before your application answers - with no user-facing UI at all. There is no case where a user ends up with a puzzle after all.
What about screen readers and accessibility compliance?
Vinishu adds no UI, so there's nothing for assistive tech to fail on. WCAG 2.2 compliance at the bot-protection layer comes for free. (Your own forms still need to be accessible, of course.)
How do you detect bots without challenging them?
A mix of TLS-handshake signals, header consistency, behavioral patterns across the session, IP reputation, and - for SDK-equipped origins - a signed session. The SDK carries verifiable proof that the browser actually rendered your page; the reverse proxy will return the same decision per request once it is live.
Will I see worse false positives than CAPTCHAs?
A CAPTCHA puts the burden on your users: fail the puzzle and you are out, human or not. Vinishu decides without a puzzle. A wrong call therefore costs nobody their session - it arrives as a score in your route, and you set the threshold. Every decision is there to look up: each block carries a fingerprint_id and a session_id you can find again in the dashboard. We quote a rate once it is measured on your traffic, not before.
Does this work for headless-browser bots (Puppeteer, Playwright)?
Yes - that's exactly what it's built for. Headless browsers leak navigator-property anomalies, deterministic timing patterns, and TLS fingerprints that differ from real browsers. Vinishu catches them without making any human prove a thing.
What does it cost to switch from CAPTCHA to Vinishu?
SDK integration is a single import. The reverse proxy - one DNS change - comes later. No per-form integration, no behavioral-data plumbing on your side. Pricing is contact-for-quote - see /pricing.
Is Vinishu an anti-bot solution?
Yes. Vinishu is a CAPTCHA-free anti-bot layer: an SDK that detects and blocks automated traffic in real time - the reverse proxy follows. The layer covers the same threats as a classic anti-bot or bot-management product - scraping, credential stuffing, checkout abuse - without ever putting a task in front of your users.
What's the difference between a CAPTCHA alternative and anti-bot software?
A CAPTCHA alternative replaces the visible task on forms, logins, and checkouts. Anti-bot software (bot management) protects the whole application - every route, every API, every page. Vinishu is both: one Vinishu layer that strips out CAPTCHAs and stops bots site-wide.
Ready to trade CAPTCHAs for invisible protection?
Get in touch, no strings attached. We'll give you honest, no-pressure advice - then see the value for yourself in a risk-free two-week pilot, with a traffic analysis at the end.