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Choose the comparison your team needs
Visual checks answer two different questions: “What changed from the approved visual state?” and “What does this pull request introduce compared with its base?” Treat those as separate checks rather than assuming one green result proves both.
| Check | What it compares | Where the baseline or approval lives | Useful for |
|---|---|---|---|
| Playwright native screenshot assertions | The current screenshot against a golden image in the test snapshot directory. | Snapshot files can be committed to Git alongside tests. | Repository-owned baselines, platform consistency, and review of image updates. |
| Chromatic UI Tests | A build against the accepted baseline associated with that branch. | Accepted snapshots are associated with branch and build history. | Branch-scoped regression checks and hosted snapshot review. |
| Chromatic UI Review | The pull-request head against its merge base. | Produces a changeset; it does not use UI Test baselines. | Reviewing what the pull request changes relative to its base. |
| Percy Git | A build against a base-branch build selected through Git history. | Approval applies to an entire build. | Teams that want build-level approval and Git-history-based comparison. |
| Percy Visual Git | A build against the latest approved snapshots on each branch. | Snapshots can be approved individually. | Teams that need snapshot-level approval. |
Tool behavior and configuration can change; consult the relevant official documentation when choosing settings. Chromatic explains branch baselines and Git history, while BrowserStack documents Percy baseline management.
Set a baseline policy before branches diverge
Pick stable, representative states
Write screenshot checks for meaningful component and page states rather than capturing every possible state indiscriminately. Use deliberate snapshot names, and select the browsers and viewports that matter to the product. Playwright’s toHaveScreenshot() uses browser and platform context in snapshot naming, which matters because renderings can differ across environments. See the Playwright visual comparisons documentation.
The Tool Desk
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
- Compact & Travel-Friendly: The ultra-compact design allows the adapter to stay plugged into your device without blocking adjacent ports or adding bulk, reducing wear and tear on your original USB ports.
- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
Decide who can approve visual changes
Choose whether a visual change requires review and approval, and whether approval applies to an entire build or to individual snapshots. Do not let a successful test silently redefine the expected appearance. A reviewer should inspect the diff and accept it only when the UI change is intentional.
Keep shared-branch baselines current
Test the shared integration branch, usually main, and keep it clean so that its visual state can serve as a meaningful reference. Chromatic recommends testing main and documents controls including autoAcceptChanges for accepting incoming changes on main in certain squash or rebase workflows, and ignoreLastBuildOnBranch when the target branch’s latest build should be ignored. Use these settings only after confirming that they match your approval policy. The details are in Chromatic’s GitHub Actions guide.
Rank #2
- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
- 90W Pass-Through Charging: Achieve optimal charging with 90W pass-through power to your laptop, supported by a total input of 100W, with the hub reserving 10W for operational efficiency. (Note: Wall charger not included.)
- Quick Data Transfers: Accelerate your productivity with rapid data transfers using a high-speed 5Gbps USB 3.0 port and two 480Mbps USB 2.0 ports.
- 4K HDMI Display: Enhance your visual experience with a hub capable of delivering 4K resolution at 30Hz in both mirror and extend modes. Please note that this hub is compatible with MacBook (macOS 12 and newer), Windows 10 and 11, ChromeOS, and laptops equipped with DP Alt Mode and Power Delivery. Note: This device is not compatible with Linux.
- What You Get: Anker USB-C Hub (5-in-1, 4K HDMI), welcome guide, 18-month warranty, and our friendly customer service.
Build a predictable branch workflow
- Create and approve the initial baseline. With Playwright native assertions, the first run creates a missing snapshot file. Inspect the generated image, then commit it with the test. With a hosted service, establish the approved baseline using its documented workflow.
- Run checks on both main and pull requests. Configure CI triggers for pushes to the shared branch and for pull requests. Install the matching Playwright browser binaries when using Playwright, and retain reports or artifacts that help reviewers understand a failure. Playwright documents CI setup and sharding.
- Make each pull-request check explicit. Use a regression check to detect changes from the approved visual state. If you also need to show what a PR introduces relative to its base, run a merge-base review separately; in Chromatic, UI Review serves that purpose, while UI Tests compare against branch baselines.
- Sync long-lived feature branches with main. Merge or rebase main into a feature branch periodically, then rerun visual checks. Branch-scoped accepted baselines do not necessarily inherit later approvals made on main.
- Review and accept intentional changes. For native Playwright snapshots, update images deliberately with
npx playwright test --update-snapshots, inspect the changed files, and commit them. For hosted checks, approve the appropriate build or snapshots after review. - Preserve Git metadata in CI. Chromatic uses Git to associate commits with pull requests and baselines. Its Playwright integration requires Git to be available in the CI environment. Ensure checkout depth and repository history meet the needs of the behavior you use. See Chromatic’s Playwright setup guide.
Keep screenshot output reproducible
A visual test is useful only when ordinary rendering variation does not overwhelm meaningful changes. Playwright warns that host OS, version, settings, hardware, power source, and headless mode can affect screenshots. Its guidance is direct: “For consistent screenshots, run tests in the same environment where the baseline screenshots were generated.” Playwright visual comparisons.
- Use the same browser version and OS or container image for baseline generation and CI comparison where practical.
- Keep viewport dimensions, device scale, fonts, and headless settings consistent.
- Control animations and dynamic content that would otherwise change between runs.
- Mask volatile regions with a stylesheet or use a considered diff threshold where appropriate; avoid thresholds broad enough to hide real defects.
- Retain the failed comparison output so reviewers can distinguish a rendering-environment problem from a genuine UI regression.
Understand what happens when main changes
In Chromatic, each branch has its own accepted baseline. A newly created branch inherits a baseline from its branch point, but later accepted changes on main do not automatically rewrite that feature branch’s baseline. As a result, a feature branch may report differences that were already accepted on main. Sync main into the feature branch and rerun to bring its code and visual state forward.
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
For a PR-to-merge-base review, the question is instead what the PR head changes relative to its base. That review is useful for understanding the changes that would land, but it does not establish that the branch is current against an approved regression baseline. Chromatic describes these branch and comparison semantics in its branching and baselines documentation.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshoot common multi-branch failures
A feature branch flags changes already accepted on main
Its branch baseline may be independent and have missed later main approvals. Merge or rebase main into the feature branch, resolve code conflicts, and rerun the visual checks.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Nearly every screenshot changes in CI
Compare the CI and baseline-generation environments: browser, OS, fonts, viewport, headless mode, and other rendering inputs. Restore a matching environment before changing expected images or relaxing thresholds.
The hosted service selects an unexpected baseline or misses commits
Check that Git is installed and that CI checkout includes the repository metadata and history needed by the service. Chromatic uses Git to associate commits and select baselines; its Playwright integration documentation calls out Git availability.
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
A pull-request diff contains surprising base-branch work
Check whether the CI pull-request event tests a synthetic merge commit and how the tool calculates the comparison. Chromatic’s GitHub Actions guidance discusses this issue and relevant branch and baseline configuration.
An update becomes the new expected result without meaningful review
Separate change detection from approval. For Playwright, review the image changes produced by npx playwright test --update-snapshots before committing them. For hosted baselines, approve only the build or snapshots whose changes are intentional.
Or skip the browser setup:
If you need a clean screenshot for a page rather than a repository-managed visual regression baseline, ScreenshotNeo can return an image or PDF from one GET request. This is a capture option, not a replacement for choosing and approving branch baselines.
Install curl, replace YOUR_API_KEY with your key, and run:
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Quick Recap
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