Productivity & Personal Tools
CortexOS
The zero-knowledge AI journal with on-device AI that reads what you wrote and reflects on it, keeping your words on your phone.
- 0community votes
- 15DR by Ahrefs +3 (up) since last check
Ahrefs Domain Rating listed 6 Nov 2026, relisted 5 Nov 2026.
A private AI journal that runs entirely on your phone, analyzing your entries with on-device AI while keeping your data encrypted and never sent to servers.
What it is
CortexOS: the homepage
CortexOS is a journaling app powered by an on-device language model that reads your entries and provides thoughtful reflections without sending any data to the cloud. The app detects over 20 emotions, identifies cognitive distortions using CBT principles, and maintains an encrypted summary of your patterns and growth entirely on your device. All entries are protected with zero-knowledge encryption where your recovery phrase is the only key, making your data unreadable to anyone else, including the creators. The app is available on iOS and Android with features including voice journaling with on-device transcription, deep analysis reflections, behavioral pattern detection, and optional encrypted cloud backup.
Listed capabilities
- On-device Llama 3.2 language model with no cloud calls
- 20+ emotion detection with intensity scoring
- Deep Analysis: multi-paragraph AI reflections connecting to past entries
- Cognitive distortion alerts based on CBT principles
- On-device voice transcription with OpenAI Whisper
- Zero-knowledge cloud vault with AES-256-GCM encryption
- Memory layer that learns your patterns over time on-device
- Behavioral pattern detection and cognitive pattern naming
- 7-day chapters that automatically organize journaling into narrative arcs
- Therapist PDF reports for sharing with mental health professionals
Pricing
Pricing model: Freemium
Free: 10 encrypted entries per month. Premium Monthly: $7.99/month. Premium Annual: $49.99/year. Lifetime: $99.99 one-time purchase. All paid plans include a 7-day free trial.
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CortexOS metrics
| Metric | Value |
|---|---|
| Domain Rating | 15 +3 (up) since last check |
| Trust Flow | 9 no change since last check |
| Citation Flow | 20 no change since last check |
| Referring domains | 17 no change since last check |
| External backlinks | 49 no change since last check |
Ahrefs Domain Rating listed 6 Nov 2026, relisted 5 Nov 2026. Listed under topic: Reference/Education (8). Majestic listed 25 Oct 2026, relisted 25 Oct 2026. Link data listed by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
CortexOS domain listing data
Show the listing data
| Domain age | 1 year |
|---|---|
| Registered | |
| Expires | |
| Registrar | GoDaddy.com, LLC |
| DNSSEC | Not signed |
CortexOS launch receipt entry
| Measure | At launch, then latest |
|---|---|
| Domain Rating (Ahrefs) | 13 to 15 +2 (up) since launch 25 Oct 2026, then 6 Nov 2026 |
| Trust Flow (Majestic) | 9 first measured 25 Oct 2026 |
| Referring domains (Majestic) | 17 first measured 25 Oct 2026 |
Day 11 since launch. Next receipt: day 30, 24 Nov 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Before you launch
The playbook on SaaS Directory List lists what to prepare, what to post on launch day and where else to list your product.
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Quick answers
What is CortexOS?
CortexOS is the zero-knowledge AI journal where you write what's on your mind and an AI running on your phone reads it back to help you see patterns, recurring themes, and the difference between processing and spiralling. Your entries are encrypted with a key only your recovery phrase can produce, so nobody else can read them.
Is CortexOS free?
Yes, the free tier gives you 10 encrypted entries per month, voice journaling, and top-3 emotions per entry. Premium unlocks the full on-device AI, the full emotion set, Deep Analysis, and the memory layer that learns you over time, with all paid plans including a 7-day free trial.
Does the AI send my data to the cloud?
No. The AI runs 100% on your device using Meta's Llama 3.2 model with zero network calls for AI processing, so your thoughts physically cannot leave your phone.
Where is my data stored?
Your entries are encrypted on your device with a key derived from your recovery phrase. If you enable the optional cloud vault, only encrypted blobs leave the phone and our servers cannot read them, so even under a court order we have nothing to hand over.
What happens if I lose my recovery phrase?
Your data is permanently lost by design, as your 6-word recovery phrase and 4-digit PIN are the only keys to your encrypted data and we never store them or recover them, which is the proof that the zero-knowledge architecture works.
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