# Django Simple Captcha for Django Forms

> Django Simple Captcha adds generated CAPTCHA images to Django forms, with configurable challenges, image processing, optional audio output, and Ajax refresh. It is a focused form component rather than a complete bot-prevention platform.

**mbi/django-simple-captcha** — Django Simple Captcha is an extremely simple, yet highly customizable Django application to add captcha images to any Django form.

- Repository: https://github.com/mbi/django-simple-captcha
- Website: http://django-simple-captcha.readthedocs.io/en/latest/
- Stars: 1,419 · Forks: 324
- Language: Python
- License: MIT
- Published: 2026-10-16 · Updated: 2026-10-16 · Language: en
- Canonical page: https://hysenlabs.com/projects/mbi-django-simple-captcha

## Django Simple Captcha's Form Protection Scope

Django Simple Captcha is a Django application for adding CAPTCHA images to forms. Its intended users are developers who operate a Django site and want an explicit human-verification step in a form workflow. The project does not position itself as a complete bot-prevention platform. Based on the repository contents, its responsibility is narrower: generate a visual challenge, expose it to a Django form, and provide customization points around the challenge and its appearance.

The application supports conventional challenge types such as random characters, simple mathematics, and dictionary words. That choice matters because a site does not necessarily need the same interaction for every form. A small contact form may use a simple text challenge, while a form associated with a more sensitive operation could use another supported style. The README does not explain per-form risk scoring, adaptive difficulty, or automated bot detection, so those capabilities should not be inferred from the package name.

The feature list also covers custom generators, noise functions, and filters. These are image-generation controls rather than CAPTCHA-solving controls. They can change how an image looks, but the README does not claim that particular visual transformations defeat particular automated systems. This project should therefore be assessed as a form component, not as a general security control for an entire site.

## Challenge Generation and Image Customization

The repository is a conventional Python package with the Django application stored in the `captcha/` directory. Its package metadata declares `django-simple-captcha` as the distribution name, Django and Pillow as runtime dependencies, and `django-ranged-response` at version `0.2.0`. The README adds an important deployment constraint: Pillow must be compiled with FreeType support. Without a suitable Pillow build, the image-generation path required by this package may not be usable.

The customization model appears to divide into three parts. A custom challenge determines the text or other content presented to the user. Generator functions control how that content is rendered. Noise and filter functions then alter the resulting image. That separation gives developers more control than a fixed image CAPTCHA while keeping the customization within the project's own form integration.

The README does not document the Python import paths, settings names, form field syntax, or the exact signatures of these custom functions. Those details should be taken from the linked documentation rather than inferred from directory names. The README's examples are limited to a project screenshot, so it does not establish a working implementation snippet for this article. This is a documentation limitation, not evidence that the customization API is absent.

## Audio Output and Ajax Refresh

Django Simple Captcha documents two features that go beyond a plain generated image. Text-to-speech audio output can present the challenge text for users who have difficulty reading the image. The README identifies Flite as a required dependency for audio output, while making clear that it is optional for the package's core image feature. A deployment that enables audio therefore has an additional operating-system dependency and configuration concern.

The accessibility claim should be read narrowly. The project states that it supports text-to-speech output of the challenge text. The README does not describe browser behavior, fallback behavior, localization, audio caching, or what happens when Flite is unavailable. It also does not claim conformance with a particular accessibility standard. Engineers should test the generated audio in the browsers and assistive technologies they support rather than treating the feature as sufficient evidence of accessibility.

Ajax refresh is also listed as a feature. This indicates that a rendered challenge can be replaced through an asynchronous request rather than requiring a full form reload. The repository summary does not include the endpoint, JavaScript asset, view, or template integration instructions. Based on the Django package layout, the integration still belongs to the host project's URLs, templates, and form configuration, but the exact wiring must be verified in the project documentation.

## Installing Django Simple Captcha and Planning the First Form

The README says the project requires Django 4.2+, Python 3.8+, and a recent Pillow version compiled with FreeType support. It also identifies the package as `django-simple-captcha` and points readers to the online documentation. The README does not include an installation command or a complete first-use example, so this article does not invent one.

Before writing configuration, confirm the package distribution name and the application package exposed by the repository: the distribution is `django-simple-captcha`, while the source application is under `captcha/`. The next step must come from the linked documentation because the exact settings entry, installed-app name, URL import, form field import, media handling, and migration command are not documented in the README.

For a first real use, define the scope of one Django form before connecting CAPTCHA behavior. Decide whether that form needs random characters, a simple arithmetic challenge, or a dictionary word. Also decide whether image output alone is acceptable or whether Flite must be installed for audio. Obtain the documented integration instructions, verify the Pillow and FreeType requirement in the deployment image, and then test the form in a development environment before exposing it to users. No exact configuration or shell command is reproduced here because the README does not state one.

## Compatibility Limits and Operational Constraints

The clearest limitation is the explicit compatibility floor. The README lists Django 4.2+ and Python 3.8+, while `setup.py` declares `Django >= 4.2`, `Pillow >=6.2.0`, and `django-ranged-response == 0.2.0`. This is useful for rejecting unsupported environments early, but it does not guarantee compatibility with every future Django or Pillow release. The repository's release history includes `v0.7.0` on 2026-07-30, `v0.6.3` on 2025-12-07, and `v0.6.2` on 2025-02-25.

The fixed dependency on `django-ranged-response==0.2.0` deserves attention during upgrades. A host project that needs a different version of that package cannot resolve the dependency set without changing the package environment or the project itself. The README does not explain whether the dependency can be removed, whether compatible releases are planned, or how conflicts are handled.

Image generation also depends on Pillow with FreeType support. Container images, minimal Linux installations, and hosting environments may use a Pillow build that does not meet that requirement. Flite adds another dependency only when audio is needed. Finally, the project addresses a CAPTCHA field within a form, not account creation policy, rate limiting, session controls, or abuse monitoring. Treating it as the sole defense for a sensitive endpoint would exceed the documented scope.

## Django Simple Captcha Versus External Challenge Services

A real alternative is an externally hosted CAPTCHA or bot-detection service. The difference is architectural: Django Simple Captcha generates and renders challenges inside the Django application, with local customization of challenges, generators, noise, and filters. An external service delegates challenge delivery and verification to a third-party system, usually through a hosted widget or API. The repository does not compare integrations, traffic limits, pricing, privacy terms, or operational support, so it does not support a claim that either approach is better overall.

The local approach can fit a team that wants the CAPTCHA component inside the same form stack and is willing to manage Pillow, optional Flite, deployment assets, and the pinned `django-ranged-response` dependency. The external approach can fit a team that wants to outsource challenge infrastructure, but its specific requirements and costs cannot be evaluated from this repository. The choice should be based on deployment constraints and verification behavior, not on the word “simple.”

The project is not a replacement for an invisible challenge, device fingerprinting service, or risk engine. Those are different approaches with different integration and failure characteristics. Likewise, the audio feature does not remove the need to test keyboard and assistive-technology behavior. Its strongest documented fit is a conventional, customizable CAPTCHA field for a Django form.

## Release Cadence, Packaging, and MIT Licensing

The repository is not archived, and its last push was on 2026-07-30. The same date is recorded for the `v0.7.0` release, which gives the repository evidence of recent maintenance activity without establishing compatibility for every deployment. `setup.py` classifies the project as Beta, so adopters should treat version compatibility and API stability as adoption checks rather than assumptions.

The package uses setuptools through `setup.py`, reads its long description from `README.rst`, and declares an MIT license. The repository also contains `LICENSE`, `SECURITY.md`, `CHANGES`, tests under `testproject/`, and tooling configuration in `tox.ini`, `.pre-commit-config.yaml`, and `.flake8`. Those entries indicate that the repository contains development and release files, but the README does not state a support policy, security response time, or upgrade-compatibility promise.

MIT licensing generally indicates that the code is made available under permissive terms, subject to the actual license text. This is not legal advice. A team should read `LICENSE` for the complete grant and conditions, check dependencies such as Pillow and `django-ranged-response`, and review `CHANGES` before moving between versions. The visible release history is useful for upgrade planning, but the README does not document a formal deprecation schedule.

## Conclusion

Django developers who need a conventional CAPTCHA control inside a Django form should evaluate this project, especially when customizable image generation or optional audio output matters. Projects that need invisible bot controls, risk-based challenges, or externally managed challenge services should look elsewhere. Before adoption, verify the current documentation, confirm that the deployment environment has a Pillow build with FreeType support, and test the generated images and audio path in the exact production environment.

## FAQ

### What does Django Simple Captcha do?

It is a Django application for adding CAPTCHA images to Django forms. The README lists random characters, simple math, dictionary words, custom generators, image noise, filters, audio output, and Ajax refresh.

### What are the requirements for Django Simple Captcha?

The project requires Django 4.2+, Python 3.8+, and a recent Pillow compiled with FreeType support. Flite is required for text-to-speech audio output, but it is optional for the core feature.

### Is Django Simple Captcha still maintained?

The repository is not archived, and its last push was on 2026-07-30. The release `v0.7.0` was also published on 2026-07-30.

## Sources

- [License: MIT](https://github.com/mbi/django-simple-captcha/blob/master/LICENSE)
- [mbi/django-simple-captcha on GitHub](https://github.com/mbi/django-simple-captcha)
- [Project website](http://django-simple-captcha.readthedocs.io/en/latest/)
- [README](https://github.com/mbi/django-simple-captcha/blob/master/README.md)
- [Releases](https://github.com/mbi/django-simple-captcha/releases)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/mbi-django-simple-captcha