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iOS · Photography journal

Keep the day’s light in one roll.

Lumen records exposure, place, and the reason you pressed the shutter. No feed, no recommendations — just a quiet roll.

Download on the App Store

iPhone · iPad

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Lumen

Keep the light.

Current roll

North window · dusk

Portra 400 · clearing after cloud

  • 1/125f/2.8Window light
  • 1/60f/4Under the colonnade
  • 1/250f/8Sky before leaving
Offline
Notes stay on this device
By roll
One outing, one journal
No account
Open it and write

  1. 01/Roll

    One outing, one roll.

    Start a roll and note the film, camera, and weather. Each exposure lands on the same strip, so you can remember where the light came from.

  2. 02/Exposure

    Numbers serve the decision you made.

    Shutter, aperture, sensitivity, and a short note stay together. Lumen does not score or compare. It remembers the choice.

  3. 03/Place

    Light belongs to a specific place.

    You can name the place for each frame. Location is used only when you allow it. You can leave it off and write the name yourself.