No blank-page problem
Start with a useful QA checklist instead of inventing every test case from scratch.
Free tools
Local-first
Free Chrome extension for QA checklists
Edge Case Assistant
Turn any web page into a QA checklist. Edge Case Assistant is a local-first Chrome extension that helps you quickly figure out what to test on the current web page or app screen. Right-click a page or UI area, generate a QA checklist, and review practical checks in the Chrome Side Panel.
Built for testers, developers, product managers, and solo founders who want a faster way to spot what should be checked before shipping.
Chrome Side Panel
Generated QA checklist
Form validation
Required fields, invalid input, long values, disabled submit state, error copy, keyboard flow.
Risky actions
Confirm destructive buttons, irreversible changes, permission checks, undo path, accidental clicks.
States and layout
Empty, loading, error, overflow, narrow viewport, truncated labels, hidden controls.
Markdown
Text
JSON
Faster QA reviews
Run a quick release, development, or feature review while the screen is still in front of you.
Likely edge cases surfaced
Catch validation risks, unclear buttons, destructive actions, mobile layout issues, and broken states.
Local-first by design
Rule-Based Mode works without a backend, and optional local AI can run through Chrome when available.
Direct answer
What is Edge Case Assistant?
Edge Case Assistant is a Chrome extension for generating QA checklists from the visible interface on the current page. It looks for forms, buttons, links, tables, dialogs, navigation, empty states, and other UI patterns, then turns them into practical checks a human can review before release.
In simple words: it turns any web page into a quick QA checklist so testers, developers, PMs, or solo founders can spot what to check before shipping.
Workflow
How to generate a QA checklist from a web page
The extension is designed for the moment when you are already looking at the feature and need useful test ideas immediately.
Open the screen you want to review
Use the extension on the current web page, staging app, local dev build, or production feature.
Right-click and generate a checklist
Choose Generate QA checklist from the page or UI area you want Edge Case Assistant to inspect.
Review the Chrome Side Panel
Get practical checks grouped around forms, actions, navigation, states, accessibility basics, and risky flows.
Copy the report
Export the checklist as Markdown, plain text, or JSON for issues, pull requests, release notes, or QA handoff.
What it checks
Practical edge case testing ideas from the visible UI
Edge Case Assistant focuses on the things that commonly break during web app QA: unclear controls, missing states, validation gaps, fragile navigation, and layouts that work on one screen but fail on another.
Forms and validation states
Buttons, links, and navigation
Tables, filters, and sorting
Dialogs, drawers, and overlays
Empty, loading, and error states
Destructive or irreversible actions
Basic accessibility checks
Responsive and mobile layout risks
Local AI and fallback mode
Rule-based QA checks first, optional local AI when available
The extension does not need a product backend to be useful. It can generate dependable checks locally, then add local AI support where Chrome makes it available.
Rule-Based Mode
A reliable fallback that scans visible UI patterns and generates deterministic QA checks without requiring AI availability.
Best for: Fast reviews, predictable output, and local-only usage.
Optional local AI Mode
When Chrome's local Prompt API or Gemini Nano is available, the extension can use local AI to add more contextual checks without sending page data to a product backend.
Best for: Screens where UI labels, flows, or state combinations need more interpretation.
Who it is for
A QA checklist generator for the people closest to the screen
The best time to catch many UI issues is while somebody is already reviewing the screen. Edge Case Assistant gives that person a structured checklist to work from.
QA engineers planning exploratory passes
Developers checking a feature before review
Product managers sanity-checking acceptance criteria
Founders shipping without a full QA team
Support or customer success teams reproducing UI issues
AI-assisted teams that need better testing context
FAQ
Questions about the Edge Case Assistant Chrome extension
What is Edge Case Assistant?
Edge Case Assistant is a local-first Chrome extension that generates QA checklists from the current web page or app screen. It helps testers, developers, product managers, and solo founders quickly decide what to test before shipping.
Does Edge Case Assistant send page data to a backend?
The extension is designed as a local-first tool. Rule-Based Mode does not require a product backend, and optional AI Mode can use Chrome's local Prompt API or Gemini Nano when those capabilities are available.
What can the Chrome extension help me test?
It can suggest checks for forms, buttons, links, tables, dialogs, navigation, validation, empty states, loading states, error states, accessibility basics, mobile layout risks, and destructive actions.
Who should use a QA checklist Chrome extension?
A QA checklist Chrome extension is useful for QA engineers, developers, PMs, founders, and support teams that need fast, practical testing ideas while looking at a live page or application screen.
Can Edge Case Assistant perform actions on the page?
Edge Case Assistant can support safe assist actions such as highlighting elements or filling supported fields with safe test values. It should not submit forms or click dangerous actions.
Free tool
Add Edge Case Assistant to Chrome
Install the free Chrome extension and turn the page you are reviewing into a practical QA checklist for forms, flows, states, and edge cases.