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BYgo — Before You Go
Before You Go: Light planning for photographers

The light somewhere is doing something rather interesting right now.

The only way to find out what is to type a city name and ask.

Already shot something? Find out what light it was →

See how it works
bygo.app/tool-bygo
BYgo shooting brief — Barcelona, Spain
7+
Data points per city
Cities supported
16
Days of forecast
Golden hour timing Shadow quality Analog film recommendations Camera settings Shooting brief Photographer references 7-day forecast Best months grid Blue hour windows Golden hour timing Shadow quality Analog film recommendations Camera settings Shooting brief Photographer references 7-day forecast Best months grid Blue hour windows

It does not show you data. It tells you what to do.

Most light planning tools are dashboards in disguise. They hand you numbers and leave the thinking to you. Sunrise at 07:04. Cloud cover 68%. UV index 3. Perfectly accurate. Completely useless.

BYgo reads the conditions and produces a shooting brief. Not a chart. Not a forecast. A decision with the specific windows worth your time, what to look for in each one, and which photographers built careers working in exactly this light.

Every city. Every condition. Every time of day. The brief changes when the conditions change. It is never the same twice.

See your brief now →
Barcelona, Spain — Overcast Live brief
Overview
Brief
Light
Shadows
Camera
Film
Your shooting brief — overcast, late afternoon
All day
Street portraits, any time

The sky has turned itself into a softbox and it belongs to you. Light arrives from everywhere at once, wraps around faces, finds no shadow worth hiding in. Point the camera at a person. Any person. Any time of day.

The kind of day Chris Killip spent his career waiting for in northeast England. He never complained about the weather.
See the work →
17:42 — Golden hour
Lit windows at dusk

The moment when interior lights become visible against the outside sky. Windows glow. The city goes dark around them and the windows are the only thing that matters.

Tod Hido drove residential streets at dusk for years looking for exactly this.
House Hunting →
+ film recommendations · camera settings · shadow quality · 7-day forecast
📋
Shooting brief
Conditions translated into scenarios. What to shoot, when, and which photographers built careers working in exactly this light.
Light windows
Precise windows for golden hour, blue hour, and solar noon. It does not approximate. Approximating is for amateurs.
🌑
Shadow quality
Hard shadows or soft. A timeline showing how this changes as the day gets on. Shadows have a character. They deserve the attention.
🎞
Film stock picks
B&W, colour negative, slide film. Matched to what the sky is actually doing, with push notes where relevant.
📷
Camera settings
Starting points by lens type. These are suggestions. Your camera and your eye will almost certainly have objections.
📅
7-day forecast
A quality rating for each of the next seven days. Allows planning. Eliminates hoping, which is an unreliable strategy.
📍
On location, right now
The nearest open film lab. The closest gear rental. Available studios nearby. BYgo finds them in real time using your city, so you spend the day shooting, not searching.
After the Shot

What light was this?

Before You Go tells you what the light will do. After the Shot tells you what it did. Drop in any photograph and BYgo reads when and where it was taken, then works out exactly where the sun was, what the sky was doing, and how many minutes of that light you had.

Then it tells you the next date the same light comes back to the same place. Save it and we write to you the day before.

Read a photo →
Free. No account needed. The photo never leaves your device.
Golden hour
Lisbon · Alfama
14 March 2026 18:47
Sun
6° above horizonazimuth 262°
Light from
West-northwest
Phase
Golden hour11 min in, 31 min left
Sky
70% cloudvisibility 14 km

Low sun, a lot of cloud. The kind of light that goes soft and gold at once, and does not hang about. You had roughly twenty minutes of it.

This light returns 28 September, 18:31Same sun angle and direction in Alfama.
BYGO.APP/AFTER-THE-SHOT#L7K2Q
Who it's for

For photographers who go out on purpose.

01
Documentary photographers
You work in real places under real conditions with no studio to retreat to. BYgo tells you what those conditions are before you find out the hard way.
02
Street photographers
The light on a street can be remarkable or it can be nothing at all. Knowing which, before lacing your shoes, is the sort of information BYgo considers its business.
03
Analog film shooters
Film costs money and does not last forever. Loading the wrong stock is a waste of both. BYgo recommends the right one. You are of course free to ignore it.

What photographers are saying.

"I checked BYgo before heading out on a grey Tuesday morning. It told me the overcast was the point, not the problem, and referenced Killip. I went out. It was one of my best sessions."

Street Photographer / Early Tester, 11K followers

"I was about to cancel a shoot because of cloud cover. The brief told me to go anyway and explained exactly what to look for. I came back with the best frames I have made this year."

Beta user / Documentary photographer

"The film recommendation matched the conditions precisely. I loaded Portra 400 instead of what I had planned and the results made sense in a way they usually do not on overcast days."

Beta user / Analog photographer

The light somewhere is doing something rather interesting right now.

The only way to find out what is to type a city name and ask.

Try BYgo →