Online Tool Store
Light Pollution Guide
Pick a Bortle scale class (1-9) to see what naked-eye and telescope viewing conditions look like at that light pollution level.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Naked-eye visible
With a telescope
How Light Pollution Guide works
- Fill in the fields above with the details Light Pollution Guide needs — a realistic sample is pre-filled so you can see the shape of the result immediately.
- Click the action button to run Light Pollution Guide — the computation happens locally in your browser, not on a server.
- Review or copy the result. Nothing about your input or output is ever uploaded or stored remotely.
Pick a Bortle scale class (1-9) to see what naked-eye and telescope viewing conditions look like at that light pollution level.
FAQ
Does Light Pollution Guide upload my data anywhere?
No. Light Pollution Guide runs entirely in your browser using local JavaScript — nothing is sent to a server, and no account or sign-up is required.
Is Light Pollution Guide free to use?
Yes, Light Pollution Guide is completely free, with no watermark, usage limit, or hidden paywall.
What is Light Pollution Guide typically used for?
It's built around light pollution guide — most visitors use it for a quick, one-off task rather than as part of a larger paid workflow.
How we compare
| Feature | Online Tool Store | Doing it manually | A generic online tool |
|---|---|---|---|
| No file upload — runs in your browser | ✓ | N/A | ✗ |
| No sign-up required | ✓ | ✓ | ✗ |
| Free, no watermark | ✓ | ✓ | ✗ |
Look up the Bortle scale and what it means for stargazing — if keeping things fast, free, and off a server matters to you, Light Pollution Guide is the straightforward choice.