features

Every feature. Every insight. All on your device.

Private journaling — no account required

Start writing the moment you open Cairn. No sign-up, no email, no account creation. Your entries are stored only on your device, protected at rest by iOS Data Protection.

• Type, dictate, or voice-note your journal entries.
• Photograph handwritten pages — scanned entirely on-device.
• Zero network calls from the app to any external server.

On-device AI intelligence

Cairn uses Apple's on-device models to process every entry. Mood detection, theme extraction, pattern analysis — everything happens locally.

• Mood Stone visualization. Each entry gets a unique "mood stone" that represents your emotional state — load, calm, hope, anxiety, fatigue.
• Automatic theme detection. Cairn extracts the key themes from each entry — work, relationships, growth, health.
• Emotional metrics. Tracks load (stress), agency (control), and clarity over time with trend charts.

"Help Me Journal" AI companion

Staring at a blank page? Cairn's AI companion asks one gentle question at a time, helping you find the words. It remembers context across turns and never labels or judges.

• Conversational prompts that feel natural, not clinical.
• Adjustable tone: listener, stoic, socratic, coach, or friend.
• Open-ended questions that deepen reflection.

Mental health & mood tracking

Cairn tracks your emotional landscape over time — not for anyone else to see, but for you to understand patterns you might miss in the moment.

• Daily mood stones. A visual representation of each day's emotional state.
• Weekly review. Automatic weekly summaries showing what was heavy, what felt calm, and how your week shifted.
• Pattern alerts. Notifications when recurring patterns emerge (for example, "your anxiety spikes on Mondays").

Insights, trends & pattern detection

• Trend charts. See how load, agency, and clarity have changed over time with interactive line graphs.
• Mood mix. Donut charts showing the emotional composition of your entries this month versus last.
• Theme timeline. See which themes — work, growth, relationships — dominated each period.

Privacy-first design

• No cloud storage. Nothing leaves your device. Period.
• No analytics. We don't track who you are, when you open the app, or what you wrote.
• No third-party sharing. Your data is not sold, shared, or used for advertising.
• Face ID lock. An optional biometric lock in settings to prevent unauthorized access.