What is Color Vision Test?
Color Vision Test is a free, browser-based tool in the Games & Brain Training suite. A 8-plate screening test inspired by Ishihara plates, generated on a canvas with colored dots. Pick the number you see in each plate; the tool flags possible color vision deficiency.
The headline benefit: ishihara-style plates drawn on canvas — see if your color vision is normal.
Unlike most online tools that upload your file to a server, process it, and send it back, Color Vision Test runs entirely in your browser. Open DevTools → Network while using it and you'll see zero file-upload requests — only static assets (JavaScript, CSS, fonts) load. Your data never leaves your device.
Why use this color vision test?
Three reasons EasyFileKit's Color Vision Test stands out from the crowd:
- **Private by design** — all processing happens locally via JavaScript and WebAssembly. No server ever sees your input.
- **Instant** — no upload wait, no queue, no server round-trip. Results appear the moment you act.
- **Free & unlimited** — no accounts, no watermarks, no daily caps. Use it as many times as you like.
How to use Color Vision Test — step by step
Here's the complete walkthrough. Everything happens instantly in your browser:
- **Step 1.** Look at the round plate — it's filled with colored dots forming a number.
- **Step 2.** Click the button matching the number you see (or “Nothing” if you can't see one).
- **Step 3.** Progress through 8 plates, each with different hue combinations.
- **Step 4.** At the end, see your score and a non-medical indication of possible color vision deficiency.
That's it. No sign-up, no upload bar, no waiting. If something doesn't work as expected, check the FAQ below.
Common use cases for Color Vision Test
People reach for Color Vision Test in a few recurring situations:
- When you need the result **now** and can't wait for a server-based tool to upload, queue, and process your file.
- When your file is **private or sensitive** — financial documents, personal photos, medical PDFs — and you don't want it travelling across the internet.
- When you're on a **slow or metered connection** — uploading a 50 MB file just to compress it makes no sense when the same work can happen locally.
- When you've hit the **daily limit or paywall** on another "free" tool site.
Privacy: what actually happens to your data
This is the single most important point about Color Vision Test, so it deserves its own section.
When you use this tool, your input is processed by JavaScript running in your browser tab. The code is downloaded once (cached afterwards) and executes locally on your CPU. At no point is your file, your text, or your input data transmitted to any server.
You can verify this yourself in under 30 seconds:
- Open Color Vision Test in your browser.
- Press F12 to open DevTools.
- Switch to the Network tab and tick "Disable cache".
- Use the tool — drop a file, type text, whatever the tool needs.
- Watch the Network log. You'll see only static assets (JS, CSS, fonts, icons). No request contains your data.
This isn't a setting you toggle or a promise in a privacy policy — it's how the tool is architecturally built. There is no upload endpoint to call.
Frequently asked questions about Color Vision Test
Q: Is this a medical diagnosis?
A: No. This is an informal screening tool inspired by Ishihara plates. Only a qualified eye care professional can diagnose color vision deficiency — please consult one for an official assessment.
Q: How are the plates generated?
A: Each plate is drawn on an HTML canvas: a hidden mask defines the digit shape, then ~1,200 colored dots are placed in non-overlapping positions, with foreground dots using one hue and background dots another. Slight jitter is added for an authentic look.
Q: What do my results mean?
A: A perfect or near-perfect score suggests normal color vision. Lower scores may indicate red-green deficiency (the most common type). Tritan (blue-yellow) deficiency is rare and harder to detect with this style of plate.
Q: Does the screen matter?
A: Yes — color accuracy depends on your display. Calibrated monitors give the most reliable results. Avoid taking the test in direct sunlight or with a screen filter active.
Q: Why are the dots different sizes?
A: Variable dot sizes and the slight hue jitter make the digit harder to read by shape alone — you need actual color discrimination to pick out the foreground from the background.
Color Vision Test: EasyFileKit vs server-based tools
Most "free" online tools that do what Color Vision Test does follow the same model: you upload your file to their server, they process it with a backend script, then they send the result back. Here's the honest comparison:
| | EasyFileKit | Server-based tools |
|---|---|---|
| **Your file leaves your device?** | Never | Yes, uploaded to a server |
| **Speed** | Instant (no upload) | Slower (upload + queue + download) |
| **Privacy** | Complete | Your file is on someone else's computer |
| **Cost** | Free, unlimited | Often capped or "premium" gated |
| **Works offline** | Yes (PWA) | No |
Server-based tools aren't evil — they exist because some tasks genuinely need heavy backend compute. But for everything Color Vision Test does, client-side processing is strictly better for you.
Under the hood: how Color Vision Test works
Color Vision Test is built with modern browser APIs. Depending on what it does, it may use:
- **Canvas API** — for image manipulation (pixel-level access, filters, resizing).
- **Web Crypto API** — native, hardware-accelerated cryptography (AES-GCM, SHA-256, PBKDF2) for any encryption or hashing.
- **pdf-lib / pdf.js** — fully client-side PDF creation and rendering.
- **MediaRecorder API** — for capturing screen, audio, and video.
- **WebAssembly** — for heavy codecs (image compression, media processing).
All of these run inside your browser's sandbox. They cannot access your filesystem (beyond files you explicitly choose), cannot make network requests with your data, and cannot run persistently in the background.
Pro tips for getting the most out of Color Vision Test
- **Bookmark the tool** — it works offline once cached, so you can use it even without a connection.
- **Install EasyFileKit as a PWA** — open the browser menu and choose "Install app" for a standalone window and offline access.
- **Use it on mobile** — every tool is fully responsive and works on phones and tablets, not just desktops.
- **No file size anxiety** — because nothing uploads, you can process large files that server-based tools would reject or charge for.
Try Color Vision Test now
The tool is right above this article — scroll up and start using it. No sign-up, no upload, no limits.
If you found Color Vision Test useful, explore the rest of the Games & Brain Training suite — there are more tools that work the same private, instant, free way. And if you have a question that isn't covered in the FAQ above, the About page has our contact email.