Caelum

Caelum

Every day, a star in your sky.

Caelum helps you keep one moment a day: how it felt, a few words and, if you like, a short video. When the month ends, your stars settle into a constellation of your own.

Store links will appear here once the app is published.

How it works
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One moment a day

Pick a feeling, write a few words.

Choose the one of seven stars closest to your day. You choose — Caelum never guesses. Add a few words, or a 10-second video with Celestial.

1 · Every day

The days fill, one by one.

Every day you keep becomes a star in the colour of the feeling you chose. A November, for example:

An island of peaceDays 1–9
A heavy stretchDays 10–15
The lonely starDay 16 · anger
The way backDays 17–23
A bright endingDays 24–30

An example month

  • Hard day 0
  • Sadness 0
  • Anger 0
  • Peace 0
  • Gratitude 0
  • Happiness 0
  • Excitement 0

When a month ends

Your month, read to you.

That month’s real sky — the Moon’s phases, constellations, meteor showers — set beside your days. A short reading of your month’s shape, a companion and a note for you. Optional, and it uses only the feelings you chose.

AI Analysis →

Your memories are yours alone.

Your notes and videos are encrypted before they leave your phone. What sits on the server is unreadable noise.

A long walk by the sea, then a hot cup of tea.

  • Your written memories and videos are encrypted before they leave your phone.
  • Location, device model and recording date are removed from videos before upload.
  • Your memories are never shown to other users.
  • The AI never sees your videos or your words — only the feelings you chose.
  • No ads, and no advertising tracking.

Read the full Privacy PolicyTerms and Conditions

A sky for every hour.

Light, sunset amber and night. Or let Caelum follow the day: light in the morning, amber in the afternoon, night in the evening.

What is Caelum?

Caelum is a mood journal and video diary app where you choose a feeling each day and keep the day in a few words or a 10-second video.

Every day you keep becomes a star in the colour of the feeling you chose. When the month ends, your stars form a constellation of your own and, if you like, you get an optional AI reading of your month’s shape. Your written memories and videos are encrypted before they leave your phone.

Who it’s for
People who want to journal without writing long entries
Device
iPhone (iOS 16.4 or later)
Price
Free plan; Celestial, the premium plan, for video memories
Languages
Turkish, English, German, Spanish, French, Portuguese
Ads
None at present
Video
One video a day, up to 10 seconds

Small, and made with care

  • Daily video memories

    Videos of up to 10 seconds. Part of the Celestial subscription.

  • Written memories

    On the free plan too — a few words about what made the day.

  • Feelings you choose

    Seven feelings, your choice. Nothing is guessed.

  • Share as a story

    Your month on a single card, ready for an Instagram story.

  • Six languages

    Turkish, English, German, Spanish, French and Portuguese.

  • Gentle reminder

    A kind daily nudge, at the time you choose.

Coming soon

CelesTogether

Add your friends and share the sky together. We’re working on it, and we’ll announce it here when it’s ready.

Guides

Short guides on keeping a mood journal and sticking with it.

Light your first star tonight.

It takes less than a minute. Tomorrow, another star.

Store links will appear here once the app is published.

Questions, ideas, or something not working? Write to us. support@appcaelum.com · Contact