Samir Shah

This plugin has two modes – basic and Akismet-enhanced.
Basic mode: the plugin will serve a CAPTCHA to all commenters that aren’t logged in and don’t have a previously approved comment. Repeat commenters will never see a CAPTCHA.
Akismet-enhanced mode (recommended): the plugin will serve a CAPTCHA only if Akismet identifies a comment as spam (much less frequently than the basic mode). Just install an activate <a href="https://wordpress.org/extend/plugins/akismet/" rel="ugc">Akismet</a> to enable this mode.
Note that a CAPTCHA will only appear after a comment is submitted. When a commenter is served a CAPTCHA:
<ul>
<li>If they fail, then the comment will be automatically discarded or trashed (and won’t clutter up your spam queue).</li>
<li>If they pass, it will be allowed into the spam queue (or approved, if you so choose). This means that any false positives from Akismet will be easily identified without you having to trawl through all the spam comments manually.</li>
</ul>
Most genuine commenters will be able to comment on your site hassle-free, without ever seeing a CAPTCHA.
The default CAPTCHA is a simple text-based test. There is also the option to use <a href="http://www.google.com/recaptcha" rel="nofollow ugc">reCAPTCHA</a> if you want something more robust (free API key required). You can also style the CAPTCHA page to fit with your own WordPress theme.
If you come across any bugs or have suggestions, please use the plugin support forum or <a href="http://rayofsolaris.net/contact/" rel="nofollow ugc">email me</a>. I can’t fix it if I don’t know it’s broken! Please check the <a href="https://wordpress.org/extend/plugins/wp-conditional-captcha/faq/" rel="ugc">FAQs</a> for common issues.
Thanks to the following people for contributing translations of this plugin: Belorussian – <a href="http://pc.de" rel="nofollow ugc">Marcis G</a>, Brazilian Portuguese – Stefano, Czech – <a href="http://trumplin.com/" rel="nofollow ugc">Ted</a>, Danish – Jesper, Dutch – <a href="http://wpwebshop.com/books/" rel="nofollow ugc">Rene</a>, Estonian – <a href="http://www.itransition.com" rel="nofollow ugc">Itransition</a>, Finnish – Jani, French – <a href="http://android-software.fr" rel="nofollow ugc">Laurent</a>, German – <a href="http://jochenpreusche.com" rel="nofollow ugc">Jochen</a>, Hindi – <a href="http://outshinesolutions.com" rel="nofollow ugc">Outshine Solutions</a>, Hungarian – <a href="http://www.televizio.sk" rel="nofollow ugc">Gyula</a>, Italian – <a href="http://gidibao.net" rel="nofollow ugc">Gianni</a>, Lithuanian – Mantas, Polish – <a href="http://www.spin.siedlce.pl" rel="nofollow ugc">Pawel</a>, Romanian – <a href="http://simplu.mixnet.ro" rel="nofollow ugc">Lotus</a>, Russian – <a href="http://www.everycloudtech.com/" rel="nofollow ugc">Ivanka</a>, Spanish – <a href="http://www.reinventia.net" rel="nofollow ugc">Reinventia</a>, Swedish – <a href="http://www.umu.se" rel="nofollow ugc">Hugo</a>, Turkish – Tony, Ukranian – <a href="http://www.everycloudtech.com/" rel="nofollow ugc">Ivanka</a>. Some of these translations are a bit out of date – updates welcome!

Conditional CAPTCHA

Asks commenters to complete a simple CAPTCHA if they don't have a previously approved comment, or if Akismet thinks their comment is spam.

Pierre Lannoy

Hosterra

Device Detector is a full featured analytics reporting and management tool that detects all devices accessing your WordPress site.
For each call made to your site, Device Detector analyzes the sent header, detects the device doing the call (and its characteristics) and can:
<ul>
<li>modify the <code>is_mobile()</code> WordPress core function to be more precise and reliable;</li>
<li>add some CSS classes to the <code>body</code> tag of your site (many classes to choose from);</li>
<li>let you use the result of the detection in your own developments;</li>
<li>record detected characteristics for reporting.</li>
</ul>
Device Detector can report the following main items and characteristics:
<ul>
<li>KPIs: number of hits, class breakdown, clients types and engines;</li>
<li>Classes: Bot, Desktop, Mobile and Other;</li>
<li>Devices types: Camera, Car Browser, Console, Feature Phone, Phablet, Portable Media Player, Smart Display, Smartphone, Tablet, TV;</li>
<li>Client types: Application Library, Browser, Feed Reader, Media Player, Mobile Application, PIM.</li>
<li>Technical characteristics and versions of all browsers;</li>
<li>Device identification: brand, model, etc.;</li>
<li>OS identification: name, version, etc.;</li>
<li>Calling channel: site backend, site frontend, cron job, Ajax request, XML-RPC request, Rest API request, Atom/RDF/RSS feed;</li>
</ul>
For a full list of items, characteristics and supported devices, please see the ‘devices’ tab in the plugin settings.
Device Detector supports multisite report delegation and per site configuration (see FAQ).
Device Detector supports an extensive set of WP-CLI commands to:
<ul>
<li>get a device detail: see <code>wp help device describe</code> for details;</li>
<li>display Device Detector status: see <code>wp help device status</code> for details;</li>
<li>toggle on/off main settings: see <code>wp help device settings</code> for details;</li>
<li>describe engine capacities: see <code>wp help device engine</code> for details;</li>
<li>display devices statistics: see <code>wp help device analytics</code> for details.</li>
</ul>
For a full help on WP-CLI commands in Device Detector, please <a href="https://perfops.one/device-detector-wpcli" rel="nofollow ugc">read this guide</a>.
<blockquote>
Device Detector is part of <a href="https://perfops.one/" rel="nofollow ugc">PerfOps One</a>, a suite of free and open source WordPress plugins dedicated to observability and operations performance.
</blockquote>
Based on the amazing <a href="https://github.com/matomo-org/matomo" rel="nofollow ugc">Matomo</a> UDD, Device Detector is a free and open source plugin for WordPress. It integrates many other free and open source works (as-is or modified). Please, see ‘about’ tab in the plugin settings to see the details.
<h4>Developers</h4>
If you’re a plugins / themes developer and want to take advantage of the detection features of Device Detector, visit the <a href="https://github.com/Pierre-Lannoy/wp-device-detector" rel="nofollow ugc">GitHub repository</a> of the plugin to learn how to use it.
<h4>Support</h4>
This plugin is free and provided without warranty of any kind. Use it at your own risk, I’m not responsible for any improper use of this plugin, nor for any damage it might cause to your site. Always backup all your data before installing a new plugin.
Anyway, I’ll be glad to help you if you encounter issues when using this plugin. Just use the support section of this plugin page.
<h4>Privacy</h4>
This plugin, as any piece of software, is neither compliant nor non-compliant with privacy laws and regulations. It is your responsibility to use it – by activating the corresponding options or services – with respect for the personal data of your users and applicable laws.
This plugin doesn’t set any cookie in the user’s browser.
This plugin may handle personally identifiable information (PII). If the GDPR or CCPA or similar regulation applies to your case, you must adapt your processes (consent management, security measure, treatment register, etc.).
<h4>Donation</h4>
If you like this plugin or find it useful and want to thank me for the work done, please consider making a donation to <a href="https://www.laquadrature.net/en" rel="nofollow ugc">La Quadrature Du Net</a> or the <a href="https://www.eff.org/" rel="nofollow ugc">Electronic Frontier Foundation</a> which are advocacy groups defending the rights and freedoms of citizens on the Internet. By supporting them, you help the daily actions they perform to defend our fundamental freedoms!

Device Detector

good plugin

Full featured analytics reporting and management tool that detects all devices accessing your WordPress site.

Conditional CAPTCHA vs Device Detector