Contents
Every major CAPTCHA type compared on difficulty, user experience, adoption, and solvability.
Quick Comparison
CAPTCHA Type
Provider
User Interaction
Solve Method
CaptchaAI Success
reCAPTCHA v2
Google
Checkbox + image select
userrecaptchaHigh
reCAPTCHA v2 Invisible
Google
None (background)
userrecaptchaHigh
reCAPTCHA v3
Google
None (score-based)
userrecaptcha + version=v3High
reCAPTCHA Enterprise
Google
Varies
userrecaptchaHigh
Cloudflare Turnstile
Cloudflare
None / managed
turnstile100%
Cloudflare Challenge
Cloudflare
Browser verification
cloudflare_challengeHigh
GeeTest v3
GeeTest
Slide / click
geetest100%
GeeTest v4
GeeTest
Slide / click / icon
geetest + version=4100%
BLS
BLS
Image grid
bls100%
hCaptcha
IMachines
Image classification
hcaptchaHigh
Image/OCR
Various
Type text
base6427,500+ types
Detailed Breakdown reCAPTCHA v2
Attribute
Details
Challenge
Checkbox → may trigger image grid
Parameters
googlekey (sitekey), pageurl
Token lifetime
~120 seconds
Detection basis
Mouse behavior, browsing history, cookies
Market share
Largest overall
Free tier
Yes (up to 1M assessments/month)
reCAPTCHA v3
Attribute
Details
Challenge
Invisible — no user interaction
Parameters
googlekey, pageurl, version=v3, action, min_score
Token lifetime
~120 seconds
Detection basis
Behavioral score (0.0 to 1.0)
Key requirement
action must match site configuration
Use case
Background bot detection
reCAPTCHA Enterprise
Attribute
Details
Challenge
Varies (v2-style or score-based)
Parameters
googlekey, pageurl, enterprise=1
Pricing
Per-assessment (Google Cloud)
Extra features
Reason codes, password breach detection
Integration
Google Cloud Console
Cloudflare Turnstile
Attribute
Details
Challenge
Invisible or managed widget
Parameters
sitekey, pageurl
Token lifetime
300 seconds (5 minutes)
Detection basis
Browser signals, TLS fingerprint
Pricing
Free (unlimited)
Growing adoption
Replacing reCAPTCHA on many sites
GeeTest v3
Attribute
Details
Challenge
Slide puzzle, click targets
Parameters
gt, challenge, pageurl
Token lifetime
60-120 seconds
Challenge freshness
Must extract new challenge each time
Market focus
China, Asia-Pacific, gaming
GeeTest v4
Attribute
Details
Challenge
Slide, click, icon select, space reasoning
Parameters
gt (captcha_id), pageurl, version=4
Key change from v3
No separate challenge parameter
Validation
lot_number + pass_token instead of validate
Difficulty
Adaptive risk scoring
BLS CAPTCHA
Attribute
Details
Challenge
Image grid ordering/selection
Parameters
sitekey, pageurl, instructions, code
Market focus
BLS visa/government services
Variations
Order images, select matching images
Image/OCR CAPTCHA
Attribute
Details
Challenge
Distorted text to type
Parameters
body (base64), numeric, regsense, minLen, maxLen, calc
Varieties
27,500+ types supported
Submission
Base64-encoded image
Enhancements
Preprocessing, text instructions
Adoption Trends 2025
Trend
Description
Turnstile growth
Cloudflare Turnstile rapidly replacing reCAPTCHA on sites already using Cloudflare CDN
Invisible-first
Sites prefer invisible CAPTCHAs (v3, Turnstile) to reduce user friction
Enterprise shift
Large sites moving from free reCAPTCHA to Enterprise or Turnstile
Regional patterns
GeeTest dominates Asia; reCAPTCHA dominates globally; Turnstile growing in Western markets
Image decline
Fewer sites using traditional image CAPTCHAs; still common on legacy platforms
Decision Guide: Which CAPTCHA Will You Encounter?
Site Type
Most Likely CAPTCHA
Google services
reCAPTCHA v2 or v3
Cloudflare-protected sites
Turnstile or Cloudflare Challenge
Chinese platforms
GeeTest v3 or v4
Government services
BLS, custom image, or reCAPTCHA v2
SaaS login pages
reCAPTCHA v3 or Turnstile
Legacy forums/CMSes
Image/OCR or reCAPTCHA v2
E-commerce
reCAPTCHA v2, Turnstile, or hCaptcha
FAQ Which CAPTCHA is hardest to solve? For end users, reCAPTCHA v2 image grids are the most frustrating. For automated solvers, all types have high success rates with CaptchaAI.
Which CAPTCHA is best for site owners? Cloudflare Turnstile offers the best balance: free, invisible, and effective. For advanced needs, reCAPTCHA Enterprise provides detailed analytics.
Are image CAPTCHAs obsolete? Not yet. They remain common on older platforms, government sites, and custom implementations. But new sites increasingly choose invisible solutions.
Solve every CAPTCHA type — start with CaptchaAI .
Discussions (0)
Join the conversation
Sign in to share your opinion.
Sign InNo comments yet.