Nail the Milky Way shot before you leave the driveway.
Nightlog turns the math of the night sky into exact camera settings, keeps every dark-sky location you've ever scouted, and logs the shots you actually got — all on your phone, all offline.
Free · iPhone & Android · No account · No cloud — your locations never leave the phone.
MILKY WAY EXPOSURE
The sky is perfect. Your settings shouldn't be a guess.
You drove two hours for this. The core is up, the air is still — and you're standing in the cold doing exposure math by headlamp, hoping ISO 6400 won't blow it out. Next month you'll be back at a spot you loved but can't quite find again, chasing settings you swear worked last time but never wrote down.
Re-deriving aperture, shutter and ISO for every lens, sky and target — every single night.
Dark-sky locations scattered across screenshots, dropped pins and memory.
No record of what you actually shot, so every outing starts over from zero.
Three tools, one dark-sky workflow.
Exposure, solved
Tell Nightlog your gear, your sky (Bortle) and your target. It returns the exact aperture, shutter and ISO — and tells you how close you are to a clean exposure, before you press the shutter.
Your location vault
Save every site with GPS, Bortle rating, horizon notes and the best months to shoot it. It all lives on your phone and works with zero signal, deep in the dark.
A real shot log
Log what you actually captured — gear, settings, conditions, keepers — so tonight builds on every night before it. Your own field notebook, finally searchable.
Every calculation the night throws at you.
Good questions.
Is Nightlog free?
Yes — get started free. Core planning and the Milky Way exposure calculator are free to use. (Update this line to match your exact free vs. paid split.)
Which phones does it run on?
iPhone and Android. Built for the field on both platforms.
Do I need an account or a signal?
Neither. There's no account to create, and Nightlog works fully offline — your saved locations never leave your phone.
What can it calculate?
Milky Way exposure, the NPF & 500 rules, star-trail planning, stacking, hyperfocal & depth of field, and moon & twilight windows.
Is my data stored in the cloud?
No. Everything — locations, logs, settings — stays on your device. Private by default.
Get your next clear night right.
Free · iPhone & Android · No account · No cloud
Nightlog gets your settings right. When you're ready to take your images further, explore the Groth Galleries astrophotography mentorship →