Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

ReCAPTCHA

reCAPTCHA Inc. is a corporation that produces CAPTCHA systems, which help websites distinguish between human users and automated bots. It is owned by Google, its parent company. The original version of reCAPTCHA asked users to decipher hard-to-read text or match images. Version 2 also asked users to decipher text or match images if the analysis of…

Companies, Criticism & Overview

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

Explore the main themes, entities and connections around ReCAPTCHA. Start with the topic map, then use the sections below for research and deeper semantic analysis.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

Developer
Google
Original authors
Luis von Ahn · Manuel Blum · David Abraham · Michael Crawford · Ben Maurer
Release
May 27, 2007; 19 years ago (2007-05-27)
Type
Classic version: CAPTCHA New version: Behavioral analysis

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Origin

Operation

Implementation

Security

Criticism

Derivative projects

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

ReCAPTCHA

Nodes68
Edges67
Triples104
Avg. degree1.97
Density0.029412
Components1

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

ReCAPTCHA

Top relations

related to reCAPTCHA v1 (human-assisted OCR) · 12
ReCAPTCHA → Any, CAPTCHA, English, If, OCR, OCRs, Once, Scanned, The, When, Words, Yet
related to Origin · 11
ReCAPTCHA → Ahn, An, CAPTCHA, Distributed Proofreaders, Guatemalan, It, Luis, MacArthur Fellowship, OCR, Project Gutenberg, The
related to Further reading · 10
ReCAPTCHA → Dzieza, Fast Company, February, Google's, Josh, June, Katharine, Schwab, The Verge, Why CAPTCHAs
related to Security · 10
ReCAPTCHA → CAPTCHA, Chad Houck, DEF CON, Hacking Conference, Houck, Jonathan Wilkins, July, On August, On December, The
Original authors · 8
ReCAPTCHA → Ben Maurer, Colin McMillen, David Abraham, Edison Tan, Harshad Bhujbal, Luis von Ahn, Manuel Blum, Michael Crawford
related to Implementation · 8
ReCAPTCHA → ASP, Furthermore, JavaScript API, NET, PHP, Ruby, The, This
related to Accessibility · 6
ReCAPTCHA → CAPTCHA, Google's, In, Instead, This, Version
related to Derivative projects · 5
ReCAPTCHA → By, CAPTCHA, Mailhide, One, The
related to Privacy · 5
ReCAPTCHA → Concerns, Google, It, The, VPN
related to reCAPTCHA v2 (checkbox) · 5
ReCAPTCHA → API, CAPTCHA, Google, In, The

Important terminology Word statistics

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

google users captcha system human version images service new word user original control used analysis security also data pages scanned

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
ReCAPTCHADeveloperGoogle1.00infobox
ReCAPTCHAOriginal authorsLuis von Ahn1.00infobox
ReCAPTCHAOriginal authorsManuel Blum1.00infobox
ReCAPTCHAOriginal authorsDavid Abraham1.00infobox
ReCAPTCHAOriginal authorsMichael Crawford1.00infobox
ReCAPTCHAOriginal authorsBen Maurer1.00infobox
ReCAPTCHAOriginal authorsColin McMillen1.00infobox
ReCAPTCHAOriginal authorsHarshad Bhujbal1.00infobox
ReCAPTCHAOriginal authorsEdison Tan1.00infobox
ReCAPTCHAReleaseMay 27, 2007; 19 years ago (2007-05-27)1.00infobox
ReCAPTCHATypeClassic version: CAPTCHA New version: Behavioral analysis1.00infobox
ReCAPTCHAWebsitecloud.google.com/security/products/recaptcha1.00infobox
ReCAPTCHAis afree-of-charge service provided to websites for assistance with the decipherment0.90text

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.