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Classic version: CAPTCHANew version: checkbox

reCAPTCHA Description
reCAPTCHA is a CAPTCHA-like system designed to establish that a computer user is human (normally in order to protect websites from bots) and, at the same time, assist in the digitization of books. reCAPTCHA was originally developed by Luis von Ahn, Ben Maurer, Colin McMillen, David Abraham and Manuel Blum at Carnegie Mellon University's main Pittsburgh campus. It was acquired by Google in September 2009.
reCAPTCHA has completed digitizing the archives of The New York Times and books from Google Books, as of 2011. The archive can be searched from the New York Times Article Archive, where more than 13 million articles in total have been archived, dating from 1851 to the present day. Through mass collaboration, reCAPTCHA was helping to digitize books that are too illegible to be scanned by computers, as well as translate books to different languages, as of 2015.
The system has been reported as displaying over 100 million CAPTCHAs every day, on sites such as Facebook, TicketMaster, Twitter, 4chan,, StumbleUpon, Craigslist (since June 2008), and the U.S. National Telecommunications and Information Administration's digital TV converter box coupon program website (as part of the US DTV transition).
reCAPTCHA's slogan was "Stop Spam, Read Books.", until the introduction of a new version of the reCAPTCHA plugin in 2014; the slogan has now disappeared from the website and from the classic version of the reCAPTCHA plugin. A new system featuring image verification was also introduced. In this system, users are asked to just click on a checkbox (the system will verify whether the user is a human or not, for example, with some clues such as already-known cookies or mouse movements within the ReCAPTCHA frame) or, if it fails, select one or more images from a selection of nine images.
A list below shows reCAPTCHA alternatives which were either selected by us or voted for by users. You can filter this list by tags and platforms

reCAPTCHA Alternatives

  • SQRL

    SQRL or Secure, Quick, Reliable Login (pronounced "squirrel" ) (formerly Secure QR Login) is a draft open standard for secure website login and authentication. The software solution typically uses a...

    Tags: Access Control Software, Password Authentication, Authentication Methods, Barcodes, Upcoming Software, Publicdomain Software With Source Code
  • GateKeeper 20 by Untethered Labs Inc.

    GateKeeper is a wireless proximity-based access control and authentication device that allows a user to automatically lock their computer by walking away and unlock it by walking back. Untethered...

    Latest version of GateKeeper 2.0 is Version 2.10.3 and it was released on 2016-09-08.

    Tags: Computer Security Software, Computer Security Software Stubs, Computer Access Control, Access Control, Access Control Software, Identity Management Systems, Identity Management, Key Management, Authentication Methods, Password Authentication, Locks, Radiofrequency Identification, Wireless Locating, Security Technology, Data Security, Bluetooth, Smart Cards
  • Stockade by Malcolm Robb, Grenville Armitage, Adam Black

    Stockade is a TCP-layer blocking tool written in C++. It denies TCP/IP access to registered IP addresses by using the ipfw packet filter. It targets spam prevention, but may also be used against...

    Latest version of Stockade is 0.2 and it was released on 2007-03-16.

    Tags: Computer Security Software, Antispam, Free Security Software
  • Moovit by Moovit Inc

    Moovit is a public transit app and mapping service. The app features trip planning, live arrival and departure times, up-to-date line schedules, local station maps, service alerts, and advisories...

    Tags: Crowdsourcing, Mobile Routeplanning Software
  • Transit by Transit

    Transit is a public transit app and mapping service based in Canada. The app is functional in over 125 cities around the world. It offers users real-time data for multiple modes of transportation...

    Tags: Crowdsourcing, Mobile Routeplanning Software, Software Companies Of Canada, Companies Based In Montreal, Ios Software, Watchos Software, Android Software
  • Waze by Waze Mobile

    Waze , (formerly FreeMap Israel) is a GPS navigation software that works on smartphones and tablets with GPS support and provides turn-by-turn navigation information and user-submitted travel times...

    Latest version of Waze is {{Plainlist| * 4.29 (iOS) * (Android) * (Windows Phone 8-8.1, Windows 10 Mobile) * 2.1.99 (Symbian) * (BlackBerry) * (Windows Mobile 6.x) }} and it was released on 2017-07-09.

    Tags: 2008 Establishments In Israel, Companies Established In 2008, Companies Of Israel, Crowdsourcing, Google Acquisitions, Internet Companies Of Israel, Ios Software, Israeli Inventions, Mobile Routeplanning Software, Navigation System Companies, Route Planning Software, Software Companies Of Israel, Mergers And Acquisitions Of Israeli Companies, Android Auto Software
  • Traffline by Birds Eye Systems Private Limited

    Traffline is a website and mobile app that provides real time traffic information in 5 cities in India, Mumbai, Delhi NCR, Hyderabad, Bangalore, Kolkata, Chennai and Pune. Developed by Mumbai-based...

    Tags: Free Mobile Software, Navigation System Companies, Route Planning Software, Crowdsourcing, Software Companies Of India, Mobile Routeplanning Software, Ios Software, Companies Based In Mumbai, Road Transport In India, 2012 Establishments In India
  • Google Voice by Google

    Google Voice is a telephony service that provides call forwarding and voicemail services, voice and text messaging, as well as U.S. and international call termination services for Google Account...

    Tags: Computerrelated Introductions In 2005, Google Acquisitions, Telecommunication Services, Telecommunications In The United States, Voip Services, Voip Software
  • Google Latitude by Google

    Google Latitude was a location-aware feature of Google Maps, developed by Google as a successor to its earlier SMS-based service Dodgeball. Latitude allowed a mobile phone user to allow certain...

    Tags: 2009 Software, Geosocial Networking, Wireless Locating, Google Maps, Mobile Social Software, Gps Navigation Software, Google Acquisitions, Discontinued Google Services
  • Trendalyzer by Gapminder Foundation

    Trendalyzer is an information visualization software for animation of statistics that was initially developed by Hans Rosling's Gapminder Foundation in Sweden. In March 2007 it was acquired by...

    Tags: Google Acquisitions, Plotting Software, Data Visualization Software
  • Picasa by Google

    Picasa is a discontinued image organizer and image viewer for organizing and editing digital photos, plus an integrated photo-sharing website, originally created by a company named Lifescape (which...

    Tags: 2002 Software, Freeware, Google Acquisitions, Discontinued Google Acquisitions, Discontinued Google Software, Google Services, Image Hosting, Image Organizers, Image Viewers, Photo Sharing, Photo Software, Software Derived From Or Incorporating Wine, Windows Graphicsrelated Software, Macos Graphicsrelated Software, 2014 Acquisitions
  • Quickoffice by Google

    Quickoffice was a freeware proprietary productivity suite for mobile devices which allowed viewing, creating and editing documents, presentations and spreadsheets. It consisted of Quickword (a word...

    Tags: Mobile Software, Office Suites, Android Software, Ios Software, Google Acquisitions, Discontinued Google Software, Discontinued Google Acquisitions
  • SketchUp by Trimble Inc.

    SketchUp, formerly Google Sketchup, is a 3D modeling computer program for a wide range of drawing applications such as architectural, interior design, landscape architecture, civil and mechanical...

    Tags: 2000 Software, 3d Graphics Software, 2000 Establishments In The United States, Computeraided Design Software For Windows, Google Acquisitions, Google Software, Macos Computeraided Design Software
  • SketchUp 3D Warehouse

    The SketchUp 3D Warehouse is an open source library where anyone using SketchUp can upload and download 3D models to share. 3D Warehouse was released in April 2006. The models can be downloaded...

    Tags: 2006 Software, 3d Graphics Software, Computeraided Design Software For Windows, Google Acquisitions, Google Software, Macos Computeraided Design Software, Computeraided Design
  • FineReader by ABBYY

    ABBYY FineReader is an optical character recognition (OCR) application developed by the Russian company ABBYY. The program allows the conversion of image documents (photos, scans, PDF files) into...

    Tags: Optical Character Recognition, Macos Graphicsrelated Software, Macos Textrelated Software, Windows Graphicsrelated Software, Windows Textrelated Software, Linux Textrelated Software, Graphicsrelated Software For Linux
  • Scanitto by Masters ITC Software

    Scanitto Pro is Windows-based software application for image scanning, direct printing and copying, basic editing and text recognition...

    Latest version of Scanitto is 3.17 and it was released on 2017-04-18.

    Tags: Proprietary Software, Image Scanning, Graphics Software, Photo Software, Windows Graphicsrelated Software, Shareware, Optical Character Recognition
  • VueScan by Hamrick Software (Ed Hamrick; David Hamrick)

    VueScan is a computer program for image scanning, especially of photographs, including negatives. It supports optical character recognition (OCR) of text...

    Latest version of VueScan is 9.5.74 and it was released on 2017-04-20.

    Tags: Image Scanning, Graphics Software, Photo Software, Windows Graphicsrelated Software, Macos Graphics Software, Windows Textrelated Software, Macos Textrelated Software, Shareware, Optical Character Recognition
  • GOCR by Jörg Schulenburg

    GOCR (or JOCR) is a free optical character recognition program, initially written by Jörg Schulenburg. It can be used to convert or scan image files (portable pixmap or PCX) into text...

    Latest version of GOCR is 0.50 and it was released on 2013-03-05.

    Tags: Free Graphics Software, Optical Character Recognition, Free Software Programmed In C
  • HP TeleForm by HP

    TeleForm is a forms processing application originally developed by Cardiff Software, but now owned by the company Hewlett...

    Tags: Business Software, Optical Character Recognition
  • Qiqqa

    Qiqqa (pronounced "Quicker") is a freeware and freemium reference management software that allows researchers to work with thousands of PDFs. It combines PDF reference management tools, a citation...

    Latest version of Qiqqa is Qiqqa v79 and it was released on {{Start date and age|2016|09}}.

    Tags: Bibliography, Bibliography File Formats, Bibtex, Content Management Systems, Document Management Systems, Educational Software, Free Bibtex Software, Free Notetaking Software, Free Reference Management Software, Library 20, Library And Information Science Software, Metadata, Mindmapping Software, Notetaking Software, Optical Character Recognition, Pdf Readers, Qda Software, Qualitative Research, Reference, Reference Management Software, Software That Uses Xul
  • CuneiForm by Cognitive Technologies

    CuneiForm Cognitive OpenOCR - a freely distributed open source OCR system developed by Russian software company Cognitive Technologies. CuneiForm OCR was developed by Cognitive Technologies as a...

    Latest version of CuneiForm is 1.1 and it was released on 2011-04-19.

    Tags: Free Software Programmed In C, Free Software Programmed In C, Optical Character Recognition, Formerly Proprietary Software, Macos Graphicsrelated Software, Macos Textrelated Software, Windows Graphicsrelated Software, Windows Textrelated Software
  • W3Perl

    W3Perl is a free software logfile analyser, which can parse Web/FTP/Mail/CUPS/DHCP/SSH and Squid logfiles. Most major web logfile formats are supported (Web : CLF/ECLF/NECLF on Unix, IIS/W3C on...

    Latest version of W3Perl is [ 3.20] and it was released on 2015-06-30.

    Tags: Web Analytics, Perl Software, Free Software Programmed In Perl, Free Web Analytics Software, Web Technology
  • AWStats

    AWStats is an open source Web analytics reporting tool, suitable for analyzing data from Internet services such as web, streaming media, mail, and FTP servers. AWStats parses and analyzes server log...

    Latest version of AWStats is [ 7.6] and it was released on 2016-12-03.

    Tags: Free Software Programmed In Perl, Free Web Analytics Software, Perl Software, Web Analytics, Web Log Analysis Software, Web Technology