> For the complete documentation index, see [llms.txt](https://docs.drizz.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.drizz.dev/reference/known-limitations.md).

# Known Limitations

What Drizz doesn't do — platform gaps, language limits, Chat's scope, the accessibility boundary, and what's missing from the API.

Every documented limitation, grouped by where it applies. This page is the single source of truth for limits.

|                   |                                                                               |
| ----------------- | ----------------------------------------------------------------------------- |
| **Platform**      | `PRESS_DEVICE_BACK_BUTTON` doesn't exist on iOS; `CLEAR_APP` is a no-op there |
| **Language**      | No loops; a blocker rule carries one action; datasets nest two levels         |
| **Accessibility** | Visual checks only — no WCAG, screen reader, contrast or ARIA validation      |
| **Automation**    | No run-status API, no JUnit/JSON export, no webhooks                          |
| **Watch out**     | Secure screens (payment PIN entry) render black and can't be automated at all |

## Platform

| Limitation                                                                       | What to do instead                                         |
| -------------------------------------------------------------------------------- | ---------------------------------------------------------- |
| `PRESS_DEVICE_BACK_BUTTON` doesn't exist on iOS                                  | Use `Tap on the back button`, or a left-edge swipe         |
| `CLEAR_APP` is effectively a no-op on iOS                                        | Reinstall the build, or reset state in the app itself      |
| Pinch and zoom gestures are limited to specific Android emulator types — not iOS | Avoid pinch-dependent assertions in cross-platform tests   |
| iOS steps run roughly **twice as slow** as the equivalent Android steps          | Budget wall-clock time accordingly; keep iOS plans smaller |

## Language

| Limitation                                   | What to do instead                                             |
| -------------------------------------------- | -------------------------------------------------------------- |
| **No loops.** There's no iteration construct | Repeat the steps, or use a data-driven test plan               |
| A **blocker rule carries one action only**   | Use one rule per action, or handle the flow with an `IF` block |
| **Dataset nesting is limited to two levels** | Flatten the structure before you bind it                       |

## Chat

| Limitation                                                            | What to do instead                      |
| --------------------------------------------------------------------- | --------------------------------------- |
| **Android only** — Chat doesn't generate tests against iOS            | Author iOS tests by hand                |
| **Roughly 20–25 steps** per generated test                            | Split longer flows, or hand-author them |
| **No API steps, module calls, `Store` or `SET`** in generated scripts | Add these by hand after generation      |

Chat is also referred to as Fathom in older material — same feature.

## Accessibility

Drizz validates what is visually rendered on screen. Everything below that boundary is out of scope.

| Not supported                          | Detail                                                                                             |
| -------------------------------------- | -------------------------------------------------------------------------------------------------- |
| **WCAG conformance scanning**          | No compliance report. Nothing Drizz produces is evidence of legal conformance                      |
| **Screen reader testing**              | No TalkBack, VoiceOver or NVDA. Drizz does not drive assistive technology                          |
| **Contrast-ratio and color analysis**  | No contrast checks, color-blindness simulation or palette validation                               |
| **Semantic and role-level validation** | No inspection of ARIA roles, accessibility labels, alt text, focus order or the accessibility tree |

A dedicated accessibility tool is required for any of the above.

## Automation

| Missing                                        | Consequence                                                          |
| ---------------------------------------------- | -------------------------------------------------------------------- |
| **No API to poll run status or fetch results** | A pipeline can start a run but can't wait for it                     |
| **No JUnit, JSON or Allure export**            | Results can't be ingested by a CI reporter or a test-management tool |
| **No webhooks**                                | Nothing calls you back when a run finishes                           |

CI integration is fire-and-forget: a pipeline can trigger Drizz and cannot gate a build on the outcome. See [CI/CD](/automate-and-integrate/ci-cd.md).

## Environment

| Limitation                                                 | Detail                                                                                                                                                         |
| ---------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Secure screens can't be automated**                      | Payment PIN entry and some banking flows render black to any capture tool, Drizz included. There is no workaround — the screen contents don't exist to capture |
| **Location can be set at provisioning, not mid-test**      | Set it when the cloud device is provisioned. You can't change it partway through a run                                                                         |
| **Precise-location permission isn't grantable everywhere** | Availability varies by device target                                                                                                                           |

## Next

* [Changelog](/reference/changelog.md) — limitations lifted, newest first
* [Glossary](/reference/glossary.md) — terms used above
* [Troubleshooting](/reports-and-debugging/troubleshooting.md) — symptom, then fix

***

*Last updated: 6 August 2026*