The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Choose Chromatic if you want cloud-rendered Storybook snapshots, hosted baseline review, and documented CI and pull-request checks with less browser infrastructure to manage. Choose Loki if you want to keep reference images in your repository and control the browser or simulator environment yourself. Both compare Storybook stories against visual baselines; neither removes the need to cover the right states and review changes.
How the two screenshot-testing workflows work
Chromatic: cloud rendering and hosted review
Chromatic treats Storybook stories as visual tests. Its CLI builds and uploads Storybook to Chromatic’s cloud; later builds are compared with accepted baselines, and reviewers inspect detected changes in hosted build review. See Chromatic’s visual testing documentation and Quickstart.
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For CI, Chromatic documents saving a project token as a secret and running its CLI or a supported integration. Linked GitHub, GitLab, or Bitbucket repositories can receive pull-request status checks. Confirm that the integration works with your repository permissions and CI provider: the behavior is documented by Chromatic, not an independent guarantee for every setup. See Automate with CI.
The Storybook Visual Tests addon supports on-demand runs from the Storybook interface and syncs accepted baselines to the cloud. Chromatic describes its local builds as builds of uncommitted code; baseline changes from those builds remain limited to the developer’s local builds until committed work triggers CI. The addon supports TurboSnap, but Chromatic says it does not replace CI. Its addon documentation requires Storybook 7.6 or later; the CLI Quickstart separately says Storybook 6.5 or later, so check the requirement for the specific integration you intend to use. See Visual Tests addon.
#1 Best Overall
- [ Upgraded IP Analog Camera Tester ] WANLUTECH 8K IP camera tester has 7'' touchscreen, 1280x800 resolution. It support to test max 8K 32MP 4K 12MP IP cameras, support CVBS analog camera test. The IP camera tester supports batch activation of DH, Hik cameras and modification of IP addresses, passwords, etc. Support IPC Test /IP Discovery/Rapid Video/RTSP Play /Quick OVIF/Hik DH test tool/Client APK. Support 1 channel BNC input & 1 channel BNC looped output, NTSC/PAL (Auto adapt). Support CVBS loop test, the tester send and receive color bar generator signal, check BNC cable
- [ AHD TVI CVI Camera Tester ] WANLUTECH IP camera tester with poe support to test max 8MP AHD/TVI/CVI camera. Using "AUTO HD" app can automatically recognize AHD CVI TVI CVBS cameras and display resolution and frame rate on the screen, supports UTC control & call OSD menu, menu settings, screenshot, video recording, video playback, etc. Support color bar generator, output one channel PAL/NTSC color bar video signal
- [ Cable Tester ] Cable Tracer: Searching for BNC cable, network cable and telephone cable from cluttered cables,also can search shield cables. RJ45 Cable TDR Test: it can test cable pair status, length, attenuation, reflectivity, impedance, skew. UTP Cable Tester: test UTP cable connection status and display on the screen, support detect the near-end, mid-end and far-end fault point of the RJ45 cable plug. Cable Length Test: Measure the breakpoint position of (open circuit status) BNC cables, RJ45 network cables, RJ11 cables
- [ PoE & SFP & Network Test Tools & WIFI ] WANLUTECH ip camera tester with PoE supports max 55V 90W PoE power output, temporarily powers the high-power PTZ camera or other devices supported by the IEEE 802.3af/at/bt standard PoE protocol. It has a gigabit SFP optical fiber module port, support insert SFP optical fiber module, for optical fiber network testing. Network Test Tools: built-in porfessional network testing tools,such as Ping, IP scan, DHCP server, PPPOE, Trace Route, Port Flash, LLDP, Link Monitor, etc. WI-FI analyzer(2.4GHz frequency band) support to analyse wi-fi signal strength,channel,channel level, support create WI-FI hotspot
- [ Multifunction CCTV Camera Tester ] Power Management: support to check the real-time voltage, power, status of Power output and power input port. Drop-down menu, Media player, including 8GB TF card, Dual Gigabit Ethernet Ports, HDMI in/out, VGA in, Audio in/out, RS485 port. Power input:DC15V 2A. Power output:DC12V/3A, DC24V/2A, DC5V/2A
Loki: project-managed references and rendering
Loki is installed as a project development dependency and initialized in the project. Its documented flow is to start Storybook, capture initial reference images, run comparisons after changes, inspect current and difference images, and approve intentional updates. By default, references go in a loki folder and are committed with the project; Git LFS is an option for storing them. See Loki’s getting-started guide.
Loki does not start Storybook for you. The getting-started guide requires Storybook—and any simulator or emulator under test—to be running. Loki’s project materials describe Chrome in Docker, Chrome in AWS Lambda, local Chrome, iOS simulators, and Android emulators as targets. They also list Node 16+ and optional dependencies for some targets. These are documented requirements and examples, not confirmation that every current release supports every combination; verify compatibility for the release and target you plan to use. See the Loki repository.
For CI, Loki documents building Storybook and passing the static output to Loki. Its guide recommends --requireReference so CI fails if a required reference image is missing. The team supplies and maintains the browser environment, baseline files, and approval workflow. See Loki’s continuous-integration guide.
Rank #2
- Comprehensive Test Function: Real-time display of voltage/current waveforms (4 channels each). Measures true RMS, DC components, peak, min/max values, harmonics up to 50x, THD, power values, and displays phasor diagrams and harmonic histograms
- Capture and Monitoring: Detects instantaneous voltage/current changes, including fluctuations, swell, sag, interruptions, and transient events. Stores up to 150 transient waveforms for detailed analysis
- Start-up Current Monitoring: Monitors inrush and start-up currents, displaying rise/fall curves, envelope curves, and waveforms. Records up to 100s of data, capturing instantaneous values and waveforms for accurate analysis
- Extensive Recording and Storage: Records 123 parameters, including harmonics up to 50x and generates trend diagrams. Supports long-term data recording with the ability to record 20 parameters every 5 seconds for up to 300 days
- Customizable Alarm Function: Set parameter limits to monitor over-voltage, over-current, unbalance, harmonic distortion, frequency, active power, and more. Generates alarm logs when limits are exceeded for proactive monitoring
Chromatic vs Loki: the practical differences
| Decision | Chromatic | Loki |
|---|---|---|
| Where snapshots render | Chromatic cloud, according to its documentation | Local or configured CI browser or simulator target |
| Where baselines live | Hosted; accepted baselines sync through Chromatic | Reference image files maintained with the project by default |
| How changes are reviewed | Hosted build review, Storybook addon, and documented pull-request checks | Inspect current and difference images, then approve reference updates |
| CI relationship | Documented CI integrations; the addon provides on-demand feedback and complements CI | CI can run against a built Storybook with required references |
| Infrastructure ownership | Less browser setup for the team, with an external cloud service | The team maintains Storybook, browser or simulator setup, and baseline artifacts |
| Compatibility checks | Distinguish CLI and addon Storybook requirements and verify the current integration docs | Verify Node, Storybook, browser, and simulator compatibility for the release |
This is a workflow comparison based on project documentation, not an independent benchmark of price, speed, browser coverage, or reliability. The documentation cited here does not establish a fair current-price comparison; check each project’s current pricing and limits before deciding on cost.
Which one should you choose?
Choose Chromatic when hosted review matters most
- You prefer not to own and maintain the browser-rendering setup for screenshot comparisons.
- Your team wants hosted baseline review and documented pull-request checks.
- You want an on-demand Storybook addon workflow alongside CI, rather than treating the addon as a CI replacement.
Choose Loki when repository ownership and control matter most
- You want reference images maintained alongside the project and reviewed through its development workflow.
- Your team can keep Storybook and the selected browser, simulator, or emulator environment running and compatible.
- You want CI to compare against committed reference images, with missing references able to fail the run.
Whichever you select, the decision is not a substitute for visual-test design. Stories need to represent the states that matter, and a person still needs to decide whether a changed screenshot is intentional.
Reduce flaky screenshot comparisons
Animation and asynchronous rendering can make screenshots timing-sensitive. Loki’s troubleshooting guide specifically calls out looping requestAnimationFrame, GIFs, SVG animations, and React Native’s Animated library as limitations. It describes disabling common CSS transitions and requestAnimationFrame, while noting that asynchronous content may require explicit completion handling. See Handling flaky tests.
Rank #3
- ❤❤(1)POA-3H Power Quality Analyzer is a comprehensive test instrument,designed for field test of three phases, multi-functional and intelligent, concise man-machine operation. It is easy to use, large LCD screen display, high resolution, interface in both Chinese and English, shock-proof shell structure and so on.
- ❤❤(2)Can simultaneously measure the 4-channel current (ABC three phase and neutral wire current), 4-channel voltage (ABC three-phase voltage and neutral line voltage to ground), the peak value of current voltage, maximum/minimum value over a period, three-phase imbalance factor, short-time voltage flicker, transformer K factor, active power, reactive power, apparent power, power factor and displacement power factor, active power, reactive power, apparent power, etc;
- ❤❤(3)POA-3H Power quality analyzer adopt DSP + ARM double processor architecture, DSP is use for data collection and the processing of algorithm, the ARM is use for the communication protocol and the man-machine interface processing; Analog signal acquisition is by 2 pieces AD7655 of ADI company.
- ❤❤(4)Using a 5.6 -inch LCD color screen display, a resolution of 640 dots x 480 dots, with different display color difference between the parameters of phase, waveform, vector diagram, harmonic ratio, the user can be more efficient and more intuitive understand the state of power grid parameters.
- ❤❤(5)Built-in flash memory can store 60 group of screenshots at the same time, 150 groups of capture transient voltage/current waveform figure, and 12800 groups of alarm list. Starting current detection model can continuously capture starting current waveform for 100 s. Built-in 2G memory card to store the trend curve record, simultaneous recording 20 parameters (can choose according to need) collect data for once every five seconds, trend curve records can be stored for 300 days.
- Use stable test data, fonts, viewport dimensions, and animation states so unrelated changes do not alter images.
- For animated or asynchronously loaded content, provide a deterministic state or wait for completion rather than relying on capture timing.
- Review changes rather than automatically accepting every new baseline; a changed image can represent either a regression or an intended design update.
Chromatic describes standardized cloud rendering and automated handling of loading, paint, and reflow on its product pages. Those are vendor descriptions, not an independently measured flake rate; they do not establish that every application will render identically on every run.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →ScreenshotNeo: an alternative for capturing pages outside Storybook
Chromatic and Loki are designed around Storybook stories and visual baselines. If you also need screenshots or PDFs of ordinary web pages through an API, try ScreenshotNeo. It is a website screenshot API and MCP server, not a replacement for Storybook visual-test review.
One GET request can return a PNG, JPEG, WebP, or PDF. ScreenshotNeo accepts cookie and consent banners like a visitor and removes more than 60 known consent platforms, newsletter popups, and chat widgets before capture; each cleanup step can be disabled. Bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf for Claude, Cursor, and other MCP clients.
It also supports full-page and CSS-selector captures, dark mode, device presets and custom viewports, retina scale, PDF settings, HTML/CSS capture, custom CSS and JavaScript, clicks, wait conditions, request blocking, headers, cookies, user agents, authorization, timezone and geolocation, transparent backgrounds, resizing, configurable caching, signed image links, asynchronous jobs with signed webhooks, bulk capture, a usage API, and an OpenAPI spec. Its parameter names also work with those used by other screenshot APIs to ease migration. These website-capture options do not turn it into a Storybook baseline system.
Rank #4
- (1)Can simultaneously measure the 4-channel current (ABC three phase and neutral wire current), 4-channel voltage (ABC three-phase voltage and neutral line voltage to ground), the peak value of current voltage, maximum/minimum value over a period, three-phase imbalance factor, short-time voltage flicker, transformer K factor, active power, reactive power, apparent power, power factor and displacement power factor, active power, reactive power, apparent power, total harmonic distortion and harmonic, etc;
- (2)Display real-time waveform, harmonic ratio bar charts of current voltage; Dynamically capture instantaneous change of voltage current, monitoring starting current, monitoring the power parameters and generate the alarm list, generate the trend chart for a long time record test data.
- (3)Adopt DSP + ARM double processor architecture, DSP is use for data collection and the processing of algorithm, the ARM is use for the communication protocol and the man-machine interface processing;
- (4)Built-in flash memory can store 60 group of screenshots at the same time, 150 groups of capture transient voltage/current waveform figure, and 12800 groups of alarm list. Starting current detection model can continuously capture starting current waveform for 100 s. Built-in 2G memory card to store the trend curve record, simultaneous recording 20 parameters (can choose according to need) collect data for once every five seconds, trend curve records can be stored for 300 days.
- (5)It apply to electricity industry, petrochemical, metallurgy, railway, mining enterprises, scientific research institution, metrology department. Especially suitable for comprehensive analysis and diagnosis on all the voltage, current, power, power, harmonic, phase electric parameters.
Plans are Free: 1,000 shots per month with no card; Starter: $5 for 3,000; Growth: $15 for 15,000; Pro: $39 for 60,000; Scale: $99 for 250,000; and Business: $249 for 1,000,000. Yearly billing gives two months free, and every feature is available on every plan.
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For API details, see the ScreenshotNeo documentation. Start with 1,000 free screenshots a month, with no card required.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Does Loki capture screenshots if Storybook is not running?
No. Loki’s getting-started guide requires a running Storybook; its CI workflow instead supplies a built Storybook.
Best Value
- [ IP Analog Camera Tester ] WANLUTECH IP camera tester with PoE, it support max 90W POE power output, temporarily powers the high-power PTZ camera or other devices supported by the IEEE 802.3af/at/bt standard protocol. DC15V power intput. It has 8'' touchscreen, 1920x1200 resolution. It support to test max 4K 12MP IP cameras, support CVBS analog camera test. The CCTV tester supports batch activation of DH, Hik cameras and modification of IP addresses, passwords, etc. Support IPC Test/IP Discovery/Rapid Video/RTSP Play /Quick OVIF/Hik DH test tool/Client APK. It has a gigabit SFP optical fiber module port, support insert SFP optical fiber module, for optical fiber network testing
- [ AHD TVI CVI Camera Tester ] WANLUTECH CCTV camera tester supports to test max 8MP AHD/TVI/CVI/CVBS camera. Using "AUTO HD" app can automatically recognize AHD CVI TVI CVBS cameras and display resolution and frame rate on the screen, supports UTC control & call OSD menu, menu settings, screenshot, video recording, video playback, etc
- [ Cable Tester ] RJ45 Cable TDR Test: it can test cable pair status, length (up to 180 meters), attenuation, reflectivity, impedance, skew. UTP Cable Tester: test UTP cable connection status and display on the screen, support detect the near-end, mid-end and far-end fault point of the RJ45 cable plug. Cable Length Test: Measure the breakpoint position of (open circuit status) BNC cables, RJ45 network cables, RJ11 cables, test length max 3000 meters
- [ Multifunction CCTV Monitor Tester ] RJ45 Dual Gigabit Ethernet ports, 10/100/1000Mbps adaptive, HDMI in, VGA in, Audio I/O, RS485, WiFi analyzer. Network Tools: IP scan, PING test, PPPOE, trace route, link monitor, DHCP server, port flashing, etc. PoE Detection: measurement POE switch or PSE power supply voltage and cable connection status. Power Management: check real-time voltage and power of POE, DC12V, DC24V power output and PSE input, DC15V power input
- [ PLEASE NOTE ] There is a paper piece isolating the battery. Before using the tester, open the battery cover and remove the paper sheet. We are the manufacturer. Any questions, please let us know, We'll get back to you within 12 hours
Does Chromatic’s Storybook addon replace CI?
No. Chromatic describes the addon as an on-demand workflow that complements CI.
Which tool is cheaper?
The documentation compared here does not establish a current, like-for-like price comparison. Check both projects’ current pricing and usage limits against your expected test volume.
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Quick Recap
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