About
Mentalium is a voice CBT diary with on-device AI transcription, built for cognitive behavioral therapy that actually fits real life.
THE PROBLEM CBT HAS WITH HOMEWORK Cognitive behavioral therapy is one of the most evidence-based forms of psychotherapy in the world, recommended by NICE, the APA, and the WHO as a first-line treatment for depression, anxiety disorders, OCD, PTSD, and panic disorder. Its active ingredient isn't the session — it's the thought diary you keep between sessions, the place where you catch a spiraling thought and work it on paper.
There's a catch. Typing a CBT diary in the moment of an anxiety spike, a panic attack, or a post-work crash is functionally impossible. The moment passes, the notebook stays empty, and most people end up reconstructing the whole week from memory two hours before the appointment. The homework that carries most of CBT's effect quietly doesn't happen.
WHAT A THOUGHT RECORD ACTUALLY IS A CBT thought record is a simple five-step tool: name the situation that set you off, catch the automatic thought that fired, label the emotion and how strong it was, notice the reaction in your body and behavior, and then write a more balanced alternative thought. Done consistently, it retrains the reflex of catastrophizing into something steadier. The method is proven — the obstacle has always been the friction of actually filling it in.
HOW MENTALIUM SOLVES IT Mentalium turns the diary into something you can keep in thirty seconds, out loud. Press the red record button and just say what happened. Speak the five steps of the thought record, and when you stop talking, the AI on your phone transcribes everything and places each part in the right field of the diary, already structured. No typing. No staring at a blank form. No cloud.
You can do it in the car after a hard call, on the walk home, in a queue, at two in the morning when the thought won't let go — exactly when it matters, not hours later.
PRIVACY BY DESIGN, NOT AS A SLOGAN The transcription model runs entirely on your phone. It downloads once and then works offline, forever. Your voice never leaves the device, and every entry lives in a local database on your phone. There is no cloud sync, no server that "processes" your worst night, no analytics on what you said, and no model training on your private words. The most intimate data there is — what you think when you're at your lowest — stays with you.
WHY ON-DEVICE AI MATTERS HERE Most "AI journaling" apps send your words to a server and call it secure. For mental health, that trade-off is the wrong one. Running the model locally means the app keeps working with no signal — on a plane, on the subway, off the grid — and it means there's simply no copy of your diary anywhere but your pocket. Convenience and privacy stop being a compromise.
PROGRESS YOU CAN ACTUALLY SEE Therapy is hard partly because progress is invisible week to week. Mentalium makes it visible. Rate your anxiety on a 1–10 scale before and after each entry, and the app draws the curve over days and weeks. A cognitive-distortion analysis reads patterns out of your own words — catastrophizing, mind-reading, all-or-nothing thinking — so you can see the shapes your mind keeps returning to. The thought record stops being a chore and becomes proof that the work is working.
BUILT FOR YOUR THERAPIST Sessions are short and memory is shorter. Pick a date range — the last 7, 30, or 90 days, or everything — tap send, and your therapist receives a clean, structured report of every entry: situations, automatic thoughts, alternatives, and anxiety levels before and after. The report is encrypted with AES-256 and only the therapist can open it. You walk in prepared instead of spending the first ten minutes trying to remember the week.
WHO IT'S FOR Mentalium is made for the conditions CBT treats first — anxiety, panic, OCD, ADHD, and depression — and for anyone doing the slow, real work of changing how they think. It fits whether you're in active therapy and want your homework to finally stick, or working on your own between appointments.
PRICING Free 7-day trial with every feature unlocked. After that, $4.99 per week or $29.99 per year. Cancel anytime in your App Store or Google Play settings. Available on iPhone now, with Android on the way.
Mentalium is the CBT diary you'll actually keep — because you can keep it by voice, in the moment, in your own words.
Learn more: https://mentalium.me/en/
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I went through CBT for my own anxiety and depression. The diary is what makes it work — and I could never keep one. Typing in the moment was impossible, so I built one you fill by voice in 30 sec.