Really Simple CAPTCHA review
A free, open-source visual CAPTCHA for WordPress sites that can use Contact Form 7.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Really Simple CAPTCHA is a free, open-source WordPress plugin that generates visual CAPTCHA challenges for use with form plugins, originally Contact Form 7. It is aimed at solo operators and small sites that want a self-hosted image challenge rather than a separately hosted CAPTCHA service. The plugin creates an image and a corresponding answer file in a temporary directory, then validates responses by comparing hashes. Its focus is narrow: it supplies image CAPTCHA functionality for WordPress integrations rather than a broader set of challenge modes.
The implementation gives site owners and developers some control over the challenge. Image colors and sizes are configurable, and the developer API covers random-word generation, image creation, response checking, and temporary-file cleanup. CAPTCHA state is stored in temporary files rather than PHP sessions. The plugin runs on the site’s own server, so image creation depends on the PHP GD and FreeType libraries being available. Contact Form 7 is the named integration, and the plugin is also described as working with other WordPress plugins; its platform fit is therefore strongest for WordPress sites with compatible form workflows.
The main trade-off is accessibility and challenge coverage. Really Simple CAPTCHA provides visual challenges only, with no audio CAPTCHA or listed accessibility features. Contact Form 7 documentation prefers reCAPTCHA over this plugin because of limitations that include the lack of audio CAPTCHA. That makes Really Simple CAPTCHA a fit for site owners who specifically want a free, open-source, self-hosted image CAPTCHA and can meet the server requirements. Sites that need audio challenges or accessibility features should choose another CAPTCHA option instead. Support is through community and documentation.
Really Simple CAPTCHA pros and cons
- Where it wins
- Generates image challenges with matching answer files.
- Offers configurable image colors and sizes plus a developer API.
- Integrates with Contact Form 7 and other WordPress plugins.
- Where it doesn't
- Supports visual challenges only, with no audio challenge.
- Has no listed accessibility features.
- Requires the PHP GD and FreeType libraries on the site’s server.
Really Simple CAPTCHA fact sheet, pricing and score →
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