Website Screenshot Comparison — Visual Diff Tool

Compare two web pages pixel-by-pixel with visual diff overlay. Configurable threshold, dimension matching, match percentage. Playwright + Pillow. For QA visual regression testing, competitor site monitoring, and brand compliance verification.

Pricing

Pay per usage

Rating

0.0

(0)

Developer

C R

Actor stats

Bookmarked

Total users

Monthly active users

3 days ago

Last modified

Screenshot Comparison / Visual Diff API

Apify Actor that takes screenshots of two URLs and compares them pixel-by-pixel.

Input

Field	Type	Required	Default	Description
`baselineUrl`	string	✅	—	Reference / baseline page URL
`compareUrl`	string	✅	—	Page to compare against baseline
`viewport`	string	❌	`desktop`	Viewport preset: `desktop` (1920×1080), `tablet` (768×1024), `mobile` (375×812)
`threshold`	number	❌	`0.1`	Per-channel pixel difference threshold (0–1)
`fullPage`	boolean	❌	`false`	Capture full scrollable page height

Output

Field	Type	Description
`baseline_url`	string	Normalized baseline URL
`compare_url`	string	Normalized compare URL
`viewport`	string	Viewport preset used
`match_percentage`	number	Percentage of matching pixels (0–100)
`diff_percentage`	number	Percentage of differing pixels (0–100)
`total_pixels`	integer	Total pixels compared
`different_pixels`	integer	Number of pixels that differ
`threshold`	number	Threshold used
`dimensions_match`	boolean	Whether baseline and compare had identical dimensions
`diff_image_base64`	string	Base64-encoded PNG diff overlay (red = different)
`diff_overlay_url`	string	Public URL to download the diff overlay PNG
`baseline_dimensions`	object	`{width, height}` of baseline screenshot
`compare_dimensions`	object	`{width, height}` of compare screenshot
`warnings`	array	List of warning/error messages
`timestamp`	string	ISO 8601 UTC timestamp
`success`	boolean	Whether the comparison completed successfully
`error`	string	Error message (null on success)

Local Development

# Install dependencies
pip install -r requirements.txt
playwright install chromium --with-deps

# Run locally
python -m src

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