Marrow Journal reads your entries, learns the language you use to describe your life, and asks the kind of follow-up question a thoughtful therapist would ask. It never tells you what to do. It just helps you think more clearly about what you've already said.
Marrow Journal is a journaling tool, not a therapy app, medical device, or crisis service. It does not diagnose, treat, or provide psychological advice. If you are in crisis, please contact a licensed professional.
Most journals are passive — they store what you write and do nothing with it. Most "AI journals" go the other way: they summarize, coach, suggest next steps, tell you what your patterns mean.
Marrow Journal does neither. It reads what you wrote, links it to what you've written before, and asks the next question. The interpretation is yours. Always.
Type freely or talk it out — voice mode transcribes on-device and reads questions back to you. Both modes use the same engine.
The app cross-references today's words against months of your own — by topic, by person, by the way you tend to speak about feelings.
A small handful of questions, never advice. Sometimes drawn from clinical frameworks. Sometimes specific to a moment from a year ago.
After every entry: "How did that make you feel?" Your answer, in your own words, becomes part of the trail of how you change.
When something you write today rhymes with something you wrote a long time ago, Marrow Journal shows you both — side by side, in your own words. No clinical labels, no diagnoses. Just the moments themselves, and a question.
"I have to present to the whole leadership team on Monday. I can already feel my hands shaking. I don't know how I'm going to get through this."
terrified"The presentation went better than I expected. I kept waiting for the moment it would fall apart but it just… didn't."
nervous but readyMarrow Journal is local-first. Entries are stored as encrypted Markdown files on your device, in a format you can read, export, or delete at any time. We never possess your data, because there's nothing on our side to possess.
Indexing, pattern matching, and question generation run inside the app on supported hardware. The work happens where the writing happens.
AES-256 at rest. Keys live in the Secure Enclave. Files are human-readable when decrypted, portable enough to take anywhere.
You pay a subscription for the app. That's the entire business. Your journal is never the product, and there's no account to delete on a server.
Behind the scenes, Marrow Journal matches your writing against a curated taxonomy of behavioral and emotional patterns drawn from CBT, ACT, Schema Therapy, Motivational Interviewing, and Emotion-Focused Therapy. The names below stay internal. What you see is always plain language: "Moments where you held back in tense situations."
"You've written about Sarah three times this week. What would change if you told her directly how you feel about Tuesday?"
"You said 'it doesn't matter,' but you've written three paragraphs about it. What would it look like to let yourself be angry about this?"
"Last June you wrote about a similar moment with a different team. You used the word 'terrified.' What feels different this time?"
"How did that make you feel?"
AI journaling apps that give you advice, and privacy-focused journaling apps that do nothing with your data. Marrow Journal is the thing in the middle.
| Capability | Rosebud | Reflection | Mindsera | Day One | Marrow Journal |
|---|---|---|---|---|---|
| On-device AI | — | — | — | partial | ● default |
| User owns all data | — | — | — | — | ● always |
| Pattern taxonomy from clinical lit. | — | — | partial | — | ● |
| Connected moments across time | partial | — | — | — | ● |
| Emotional evolution in your words | — | — | — | — | ● |
| Two-way voice mode | partial | — | — | — | ● |
| Never gives advice | — | — | — | n/a | ● by design |
You pay for the app. Your data lives on your device. We host none of it, sell none of it, train on none of it. The numbers below are indicative and will be finalized at launch.
Optional: confidential-cloud re-index of your full history is à la carte. Compute happens inside a hardware-backed enclave; no plaintext retained. We'll publish exact pricing alongside the privacy spec at launch.
No. Marrow Journal is a journaling app with intelligent follow-up questions. It does not diagnose, treat, or recommend treatment for any condition. It does not replace a licensed professional. The line is bright by design — that's what allows it to be useful without being clinical.
On your device, as encrypted Markdown files. You can read them, export them, or delete them at any time. We don't host them, and there's no account on our servers. Optional iCloud Drive sync uses encrypted files; the keys never leave your device.
For users on older hardware or anyone who explicitly wants faster re-indexing, we offer a remote compute path that runs inside a hardware-backed enclave (a Trusted Execution Environment). The cloud provider — including their admins — cannot see your data, model weights, or outputs. Processing is stateless and verifiable through remote attestation.
No. Every output passes through a quality filter that rejects advice, diagnoses, or directives. The system asks questions. The interpretation belongs to you.
iOS first — iPhone 12 and newer recommended for full local inference. Older devices automatically fall back to the confidential-cloud path. Android is the next planned platform, starting remote-first with selective local inference on supported hardware.
Please contact a crisis line or licensed professional immediately. Marrow Journal is a reflective journal, not an emergency resource. Onboarding includes regional crisis-line information and clear disclaimers.
Your indexed history grows with each entry. After roughly 10–15 entries the questions start to sharpen — they begin to reference specific people, recurring situations, and the way you tend to describe feelings. None of that learning leaves your device.
Join the waitlist for early access. We'll only email you when the iOS app is ready, and once again at Android launch.