Lumi is a secret diary with a lock, for kids aged 5 to 12. You write in it, you decorate it with photos and stickers, you lock it — and everything stays on the phone.

NO INTERNET. REALLY.

Lumi does not ask for permission to use the network. That is not a promise you have to take on trust: you can check the app's permissions before installing. There is no account to create, no password to invent, no advertising, and no data going anywhere.

What your child writes stays where they wrote it.

THE DIARY

It is a journal where every day has its own page, even when it is blank. It starts with a face — how did today go? — and then you write, change the colour of the ink, add a photo, record your voice, stick on stickers. You turn the pages with your finger, like a real notebook.

THE LOCK

Anyone who wants can lock the diary with a secret code made of pictures rather than numbers: you choose it by tapping four drawings, and you can remember it at six years old. Inside, everything is encrypted on the phone.

For parents there is a recovery code, to put somewhere safe on day one: it is what you need if your child forgets theirs. Without it not even we can open the diary, and that is precisely the point.

AN EGG EVERY DAY

Each day brings an egg. It opens once, and a friend comes out to collect: some are common, some rare, some epic, some legendary, and a few can only be found in their own season. They are never sold, and there is no paid shortcut: it is one surprise a day, and that is all.

FOR PARENTS

Behind a small sums question — one a seven-year-old will not solve — is the parents' area: the recovery code, and the backup.

The backup is a single encrypted file, and you put it wherever you like: on the phone, on a memory stick, in your own cloud storage. It never passes through a server of ours, because we do not have one.

WHAT IT COSTS

Fifteen days to try all of it, with no limits and no card details. After that, you buy it once, with a single in-app purchase. It is not a subscription and there is nothing else to buy.

When the trial ends, everything already written stays readable and can still be copied: only writing stops. Memories already written are never held hostage.

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Lumi asks for two permissions, and only when they are needed: the camera, to put a photo in the diary, and the microphone, to record a voice. Photos and recordings stay inside the encrypted diary, on the phone.