A private journal you can talk to — and it talks back, entirely on your device. A vault for what matters most. And a way to leave your words for the right people, long after you're gone.
The most honest writing happens when no one is watching. We built a place where no one ever can.
Most journal apps are either private or intelligent — never both. We refused that compromise. Here is what makes Encrypted Diary unlike anything else you have written in.
Your entries are encrypted on your device with AES-256 before they ever touch storage. The only key that unlocks them lives with you. Not us. Not anyone.
A thoughtful AI that has read what only you have written — because it lives entirely on your device. It can discuss, summarize, and even write the story of your life. How our AI journaling works →
Not just a diary. Store your will, your last wishes, kept secrets, photos, recordings — sealed alongside the words that explain them.
Choose what is released, to whom, and when — by date, by inactivity, by named contact, or never. Free posthumous publishing through FamilyTreesAI for those you wish to remember you.
Every other journaling app faces a contradiction: their AI features only work if their servers can read your entries. That isn't private. That isn't a diary.
So we built the AI into the diary itself. It runs on your computer, learns from no one but you, and never sends a single word over the network. The companion is as private as the diary it lives inside.
Most people don't journal because they don't know where to start. The blank page is the killer of every good intention.
Switch the Companion into News Reporter Mode and the dynamic flips. Now it is the journalist assigned to write your story — and you are the subject. It asks the questions a thoughtful reporter would ask. You answer in your own words. Over weeks or years, what emerges is a profile of you, written by you, drawn out one question at a time.
When you are ready, the Companion can compile the answers into a written feature — your story, in the voice of someone who has been listening carefully.
A diary is the place where you are most honest. So it is also the natural place for the things you are most afraid of misplacing.
Store your will alongside the reasoning behind it — with planned partner discounts if you need to draft one. Record your last wishes in your own voice. Keep the secrets you want kept, with rules you set for if and when they ever surface.
Every other private diary has the same answer: nothing. Your family is locked out forever. The most honest record of you simply disappears.
We thought about that for a long time. Then we designed something better (rolling out after launch). You decide what survives you. You decide who reads it. You decide when.
Research is unkind to journaling apps. The youngest writers stop in their thirties. Life gets busy. The habit slips. And every subscription-based diary holds your words hostage the moment you stop paying — locking out the very person most likely to want them back ten years later.
Compare what you would spend with us against the going rate for a polished journaling app — and then ask yourself what happens to your entries if you ever stop paying.
Encrypted Diary is in final development. Expected delivery: Summer 2026. Reserve your license now to lock in the $79 launch price (reg. $99). No charge until the day we deliver. Cancel any time. We will email you a single time when we ship.
$99 to start — your license, plus your first year of software updates and 25GB encrypted cloud storage included. After year one, it renews automatically at $29/yr so your updates and storage keep working without a lapse — cancel any time, no questions asked.
Get the Express Bundle — $99 →Not ready to buy? Try the full app free for 14 days → No card, no signup.
Want software updates, encrypted cross-device sync, and off-site backup of your encrypted diary? Choose the cadence that suits you. None of these is required to keep using your diary — they extend it. Each plan includes 25GB of encrypted cloud storage — plenty for a lifetime of text, and most photos and voice too. Need more? Extra storage is $10/year per 50GB.
Diary Lite lives on your phone and in any browser — deliberately light, fully private, works on a ten-year-old handset. The Desktop Companion carries the heavy intelligence. Here is exactly which promise lives where:
| Diary Lite phone & browser |
Desktop Companion included, Windows |
|
| Encrypted diary — offline, yours forever | ✓ | ✓ |
| Interview mode & Life-Story chapters, printable story | ✓ | ✓ |
| Auto-lock, safekeeping kit, four looks | ✓ | ✓ |
| Voice entries | via your keyboard's mic | on-device transcription |
| AI Companion — discusses entries, writes your memoir | ✓ on newer phones (2023+), 100% on-device | ✓ 100% local, via Ollama |
| Photos in entries | coming in a free update | ✓ |
| Backup | one-tap, to anywhere you trust | your house becomes your cloud |
A lifetime of entries, photos, and voice adds up — and phones and tablets have finite storage (a desktop or laptop rarely will). We've made exporting your whole diary a single tap, any time, to anywhere you trust. If you'd rather not think about it as your diary grows, our optional encrypted cloud (25GB included) backs it up automatically, off your device — still end-to-end encrypted, still unreadable by us.
On the roadmap: a native mobile app with background home-backup, and the legacy-release watch service.
Most companies hide this paragraph. Here is ours: you never have to pay us another dollar after the $79. Install the included desktop companion, leave your computer on once a week, and your own house does everything our cloud does — backups, sync, even the legacy watch. We'll show you exactly how, step by step, at no charge. We make less money when you choose this. We publish it anyway, because a diary you're locked into isn't private — it's hostage. The $29/year is for people who'd rather not think about it. Both kinds of customer are welcome here.
And if you stop paying? Your diary stays on your devices, and the last backup stays with us — sealed, unreadable to anyone including us, free to download the day you come back. We don't delete a life's writing over a missed payment. We don't have the heart.
Encrypted Diary is built by a small team rooted in Christian conviction. We believe in the quiet dignity of private words, in the responsibility of leaving wisdom for those who come after us, and in the goodness of building tools that respect the soul as much as the data.
The product is for everyone — Christian, agnostic, observant of another tradition, undecided. The encryption, the on-device companion, and the legacy features serve any life. We don't believe a person needs to share our beliefs to deserve a thoughtful product.
That said: we also offer a Christian Edition — with scripture-aware prompts, prayer-journal features, a Companion shaped by historic Christian wisdom, and tools for passing faith through generations. It is the same diary, dressed for a different room.
We began beta testing with real people in Albany, Oregon — actual families writing actual entries, before we ever opened this more broadly. Nothing here was designed in a vacuum.
Reserving a license? Christian Edition is yours at no extra cost, with three years of complimentary updates. Same encryption, same Vault, same Legacy — with scripture integration, a faith-shaped Companion, daily verse, and a curated 24/7 prayer-line directory layered on top.