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Know Your Sky
Before You Go.

Accurate sky quality forecasts based on the Bortle Scale — so you plan the perfect night of stargazing or astrophotography with confidence.

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Free during beta · No credit card · Invites rolling out weekly

Milky Way over a dark sky observing site

Imaging conditions

Tonight · Wimberley, TX

Good Great night to shoot

Cloud cover 0%

SQM 21.4

Seeing 3 / 5

Moon 12%

Everything you need

Plan the perfect night under the stars

From sky-quality maps to target timelines and live conditions — every tool in one dashboard, built for serious astrophotographers.

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Sky-Quality Map

Interactive Bortle overlay with SQM mag/arcsec² readings and survey rings at 75 and 100 miles. Find the darkest accessible site for tonight's window.

Deep space nebula captured through a telescope

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Target Timeline

All your DSO targets on a dusk-to-dawn axis, with altitude gradients, best-window gold markers, moon proximity alerts, and telescope FOV filters.

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Conditions Board

Five synchronised charts — sky quality, cloud cover, temperature & dew point, wind, and seeing — with dew-risk alerts, best-window markers, and a go/no-go verdict at a glance.

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Red-Light Mode

One tap flips the entire dashboard to deep-red tones — protecting your dark-adapted vision at the eyepiece without interrupting your workflow.

Simple to get started

Three steps to a perfect night

Set up takes under two minutes. Your first report is waiting.

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Add your location

Enter your home address or a favourite dark-sky site. BortleBug looks up your Bortle rating, elevation, and timezone automatically.

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Register your telescope

Enter your focal length and sensor size. We calculate FOV overlays, pixel scale, and imaging windows matched to your exact gear.

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Read tonight's report

Your dashboard populates with a full sky-quality forecast, target timeline, and conditions board — refreshed nightly for your window.

Built for the field

Stop guessing.
Start shooting.

BortleBug combines real-time weather data, SQM readings, and Bortle-mapped site intelligence into a single dashboard — so you drive to the right spot on the right night.

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Imaging score

What does your night actually look like?

Every forecast distils down to a 0–100 imaging score. Each band is a different sky — from inky black Bortle 2 to washed-out suburban glow.

85+ Excellent

Milky Way core visible, M33 naked-eye. Bortle 2–3.

70–84 Good

Milky Way clear, zodiacal light possible. Bortle 3–4.

50–69 Fair

Milky Way faint, glow on horizon. Bortle 4–5.

30–49 Poor

Strong light dome, Milky Way gone. Bortle 6–7.

<30 Bad

Bright sky glow, only mag 3 stars visible. Bortle 8–9.

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Know Your SkyBefore You Go.