Solver guide
CAPTCHA Solving API: Compare Providers, Endpoints & SDKs
Compare CAPTCHA solving APIs by supported CAPTCHA types, SDK and language coverage, documentation quality, response model, and pricing.
Overview
How a CAPTCHA solving API works
A CAPTCHA solving API lets your code offload challenges programmatically. The typical flow is: submit a task (an image, or a sitekey plus page URL), then poll for the result or receive a callback, and finally receive the recognised text or a verification token.
When you are integrating, the details matter: REST versus official SDKs, synchronous versus asynchronous handling, concurrency limits, error semantics, and the breadth of supported CAPTCHA types. Clear, complete documentation is often the difference between a one-hour and a one-week integration.
Why CaptchaRank
How CaptchaRank helps you choose
An independent directory
Browse every provider in one place, with supported CAPTCHA types, documentation links, and profiles.
Browse solversBenchmark context
Put providers side by side and weigh solve speed, success rate, and received rate together.
Open comparisonPer-type breakdowns
Drill into each CAPTCHA type to see exactly which providers support it and how.
View CAPTCHA typesBuyer's checklist
How to evaluate a CAPTCHA solver
Supported CAPTCHA types
Confirm the provider explicitly supports the exact challenges you face — not just a generic fallback.
Solve speed
Average solve time directly affects throughput in automated and real-time flows.
Success & received rate
Higher reported accuracy means fewer retries and lower effective cost per solve.
API & SDK coverage
Check REST endpoints, official SDKs for your language, and the quality of documentation.
Pricing model
Per-solve and per-thread models scale differently — compare the price for your CAPTCHA type at your volume.
Concurrency & support
Concurrency limits cap throughput; responsive support matters when integrations break.
From the directory
CAPTCHA solving API providers
CaptchaAI
CaptchaAI profile for comparing officially documented CAPTCHA coverage, API integration context, pricing notes, and imported benchmark snapshots.
2Captcha
Established hybrid solver with explicit support for image, reCAPTCHA, GeeTest, Turnstile, FunCAPTCHA, and data-labeling tasks.
Anti-Captcha
Human-powered API with published support for images, reCAPTCHA, GeeTest, Turnstile, Arkose, and coordinate tasks.
CapMonster Cloud
AI-first cloud solver with documented support for reCAPTCHA, GeeTest, Turnstile, FunCAPTCHA, and text captcha endpoints.
CapSolver
AI-powered solver with support for reCAPTCHA v2/v3, GeeTest, Turnstile, and image-to-text tasks.
SolveCaptcha
Budget-oriented solver with documented support for image, reCAPTCHA, Turnstile, GeeTest, FunCAPTCHA, slider, and text captcha flows.
EZ-Captcha
Machine-learning captcha solver with public support for reCAPTCHA, FunCAPTCHA, Turnstile, and hCaptcha.
NextCaptcha
NextCaptcha profile for comparing supported CAPTCHA type relationships, API documentation, and imported benchmark snapshots.
Explore by challenge
Related CAPTCHA types
reCAPTCHA v2
Google checkbox and invisible reCAPTCHA v2 token solving.
hCaptcha
hCaptcha image-selection and token workflows.
Cloudflare Turnstile
Cloudflare Turnstile token generation for managed and invisible flows.
GeeTest
GeeTest slider and puzzle captcha workflows.
Frequently asked questions
What languages and SDKs do CAPTCHA APIs support?
Common coverage includes Python, JavaScript/Node, PHP, Java, C#, and Go, sometimes via official SDKs and sometimes via a plain REST API. Check each provider's documentation for the languages you use.
Are CAPTCHA solving APIs synchronous or asynchronous?
Most use an async model: you create a task, then poll for completion or receive a webhook. A few offer near-synchronous endpoints for fast challenges. Confirm the model before designing your retry logic.
How do I handle concurrency and rate limits?
Providers publish concurrency caps and rate limits that affect throughput at scale. Match those limits to your workload and budget when comparing options.
How do I evaluate API quality?
Look at documentation completeness, the number of supported CAPTCHA types, SDK availability, error handling, and the response/token format — then validate with a small proof of concept.
Ready to compare providers?
Put the services side by side, or explore the full directory of CAPTCHA solving providers.