Update Loki reference screenshots only after you have run the comparison and confirmed that the rendered change is intentional. Run yarn loki test, inspect both the current screenshots and visual differences, then use yarn loki approve to accept approved changes. If a difference is a regression or test-environment problem, fix it and rerun instead of refreshing the baseline.
Use review, not refresh, as the rule
A reference screenshot is the image Loki compares against later runs. Replacing it changes what the test treats as expected, so approval is a review decision—not routine cleanup. Keep the UI change and its approved screenshots together in the same code review so reviewers can judge whether the new appearance is intended.
The Loki project’s documented sequence is to start Storybook and any required simulator or emulator, create initial references with yarn loki update, make UI changes, run yarn loki test, inspect the result, and approve intended differences with yarn loki approve. See the Loki README and Getting Started guide. Commands and defaults can vary by Loki version and project configuration; check the version pinned by your project.
Update references safely
- Start the capture environment. Run the Storybook instance Loki will use. If the configured target is an iOS simulator or Android emulator, start that too; Loki does not start these environments for you. Use the browser or mobile target configured for your project.
- Create references only when needed. For an initial baseline, run
yarn loki update. This captures screenshots and updates references; it is not the normal command for reviewing an existing baseline. - Make the intended UI change, then compare. Run
yarn loki test. Review the generated current screenshots and difference images before deciding what to do next. - Inspect the evidence. Check the rendered screenshot and its diff for each changed story. Confirm the difference matches the change you intended, and look for unrelated layout, typography, color, missing-content, or rendering changes. Loki’s guide describes outputs in
loki/currentandloki/difference; these are documented examples, not guaranteed paths for every configuration or version. - Approve only intentional changes. When review confirms the appearance is correct, run
yarn loki approve. The approve command uses images generated in the last run to update references and can prune outdated references. - Commit code and references together. Include the approved reference files with the implementation change, then review both in Git. The Loki guide recommends checking references into Git; Git LFS is an optional storage choice.
Choose full approval or failed-test-only approval
Use the normal approval command when you have reviewed the full set of generated images and want to update references accordingly. Loki’s CLI also documents --diffOnly, which limits approval to files that failed the previous test run. It can reduce the scope of replacement when you want to approve only differences from that test, but it does not replace visual review. Check the CLI for your pinned version before using the option: Loki CLI reference.
#1 Best Overall
- 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.
When not to approve
If the rendered change is not intended, leave the reference untouched. Fix the component, story, or capture setup that caused the difference and run yarn loki test again. A baseline update that absorbs an unexplained difference can make future comparisons accept a defect as normal.
- Unexpected component change: correct the implementation and retest.
- Inconsistent rendering: investigate whether the browser, simulator, fonts, viewport, or other capture conditions differ from the established setup before accepting images.
- Missing or blank output: treat it as a capture issue to diagnose, not as a new expected appearance.
Make missing baselines fail in CI
For continuous integration, Loki documents --requireReference to fail when a reference is missing, rather than silently introducing one. Its CI guidance describes a static Storybook build and test pattern; adapt it to the scripts and Loki version your project uses. This makes missing references visible as a review task instead of allowing CI to normalize them automatically. See Loki CI documentation.
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.
Capture target and repeatability
The Loki README lists Chrome in Docker, Chrome in AWS Lambda, local Chrome, iOS simulator, and Android emulator as capture targets. Its README also lists Node 16 or later as a prerequisite. These are version-sensitive statements in project documentation, so verify them against your installed Loki version and the target your stories require. The CLI documentation calls Docker Chrome recommended, but the suitable target depends on whether you test web or native stories and on your CI environment.
For reliable comparisons, keep the capture target and its relevant environment consistent between reference creation and later tests. Changing target or configuration at the same time as accepting a UI change makes it harder to tell whether a difference came from the product or the capture setup.
Outdated Drivers Are Slowing You Down
One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchPC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Rank #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.
Or skip the browser setup
For a one-off screenshot of a public page outside Loki’s component-baseline workflow, ScreenshotNeo provides a single-request screenshot API. Loki remains the tool for Storybook screenshot baselines and their comparison/approval workflow; ScreenshotNeo is an alternative for capturing website pages without setting up a browser locally. It accepts cookie or consent banners as a visitor and removes 60+ known consent platforms, newsletter popups, and chat widgets before capture; each step can be turned off. Bot checks/CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, and responses identify the page verdict and billing status. Its MCP server offers take_screenshot, get_page_info, and capture_pdf for AI agents and other MCP clients.
Example cURL request (replace the URL with the page to capture):
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options and setup. ScreenshotNeo’s free plan includes 1,000 shots a month with no card; paid plans start at $5 for 3,000 shots. Learn about ScreenshotNeo, or sign up free for 1,000 screenshots a month with no card.
Quick Recap
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.
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
Common problems
- References changed more broadly than expected: approval may include generated images beyond the intended failures or prune outdated references. Review the prior test output and use the documented
--diffOnlyoption when its scope suits the task, after verifying support in your installed CLI. - No useful comparison appears: confirm Storybook and the required simulator or emulator are running and that Loki is targeting the expected stories and environment.
- CI reports a missing reference: with
--requireReference, this is a deliberate failure requiring a reviewed baseline; generate and inspect it in an appropriate review workflow, then commit it. - Local and CI images differ: compare their capture targets and setup. Do not approve environment drift as a UI change until the capture conditions are understood.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Quick wins for a faster PC:
Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →
