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Cedar Bog Lake, MN · Oct 16, 2023

Cedar Creek Ecosystem Science Reserve

Watch the world change, one visitor’s photo at a time.

254,918 photos at 1,388 places and counting.

Every visit adds a frame.

  1. Hands setting a phone in a Chronolog bracket

    Take a photo

    Set your phone in the bracket and send your photo.

  2. Watch it change

    Your photo joins everyone else’s in one timelapse.

  3. Four organizers laughing beside their new Chronolog on a post among saguaros

    Help look after it

    The people who care for the place use Chronolog to see what’s changing.

See the difference.

Two visitors took these on their own phones, weeks or years apart. Chronolog lined them up.

Pollinator Prairie- East, March 18, 2025
Pollinator Prairie- East, April 29, 2025
APR 29 2025
MAR 18 2025

A controlled burn clears the prairie, and it’s already greening back. See every photo

Live from the field

Someone just added a photo.

254,918

Photos contributed

1,388

Places

494

Organizations

14

Countries

Recent photos

Meet the people using Chronolog.

Rangers, teachers, and volunteers at hundreds of organizations, and the visitors who add photos.

A hiker sets a phone in a Chronolog to photograph grassy coastal hills

For parks, nature centers, land trusts, schools & more

Give your place a memory.

Each person who stops adds a photo. Together, they show how your site changes.

  • Up in an afternoon
  • No power or Wi-Fi
  • Full-resolution photos and video