The thought diary app that works through what you write down
Most thought diary apps store what you're thinking. Noisefilter processes it. Write the thought, work through it with structured CBT questions, and leave with something resolved — not just recorded.
Get it out of your head first
Brain dump app — get it out of your head first
Some thoughts need to come out before they can be examined.
You know the ones. The thought that's been circling since Tuesday. The conversation you keep replaying. The decision you've made three times and unmade twice. The worry that arrives at 2am and parks itself there until morning.
The first thing Noisefilter does is simple: it gives you somewhere to put it. Write the thought exactly as it is — unfiltered, unedited, no one else reading it. Get it out of your head and onto the screen.
That act alone does something. Externalising a thought — moving it from inside your head to somewhere you can look at it — creates distance. The thought stops feeling like part of you and starts feeling like something you're looking at.
But Noisefilter doesn't stop there.
Most brain dump apps stop at the dump. You write it, it's stored, you feel marginally better for about 20 minutes, and then it comes back. Because writing a thought down doesn't resolve it. Examining it does.
Plans
Free thought diary app — what you actually get
3 free sessions a month is enough to know whether this works for you. Most people know after the first one.
Free plan — 3 sessions every month
- ✓Write the thought and choose how to work through it
- ✓Five reflection methods built in — pick the one that fits
- ✓AI-guided questions that push back when your answers are vague
- ✓Post-session analysis: thinking patterns + emotional intensity change
- ✓Thought history — every session saved with status tracking
- ✓Mood log — daily check-in, connects to your thought patterns
- ✓No credit card. No time limit. Free plan doesn't expire.
No credit card. No time limit. Free plan doesn't expire.
Pro plan — unlimited
- ✓Unlimited sessions
- ✓Full session history across weeks and months
- ✓Pattern detection — which cognitive distortions recur
- ✓Cognitive distortion analysis in plain language
- ✓Export your records
- ✓Priced locally via Google Play
Beyond just writing it down
CBT thought diary — beyond just writing it down
When you write a thought in Noisefilter, you're not just recording it. You're starting a session. The app asks you structured questions based on what you wrote — the same questions a CBT therapist would ask if you brought this thought into a session.
What's the evidence this thought is true? What's the evidence it isn't? Are you applying a rule to yourself you wouldn't apply to anyone else? What would you say to a friend who had this thought?
These aren't rhetorical. The app waits for your answers. It follows up when your first answer is vague. It holds the structure of the process even when your thinking is narrowed by anxiety — which is exactly when structure matters most.
Research shows people who complete CBT thought records properly experience a 20–40% reduction in emotional intensity per session (Haug et al., 2012). The key word is properly. Vague answers, skipped questions, self-confirming responses — these produce no shift. The AI guidance exists specifically to prevent that.
Five reflection methods — each for a different kind of thought
Unpack It
CBT thought record
For thoughts about specific situations. A situation happened, an automatic thought arrived, and it's been sitting there since. This method examines the evidence and writes a more accurate version.
Best for: Overthinking, self-doubt, anxiety about specific events
Question It
Socratic questioning
For beliefs that feel like facts. "I'm not good at this." "People don't really like me." These aren't facts — they're interpretations. This method surfaces the assumption and examines whether it holds up.
Best for: Recurring self-criticism, deeply held negative beliefs
Challenge It
Byron Katie's The Work
For thoughts about other people, the past, or how things "should" be. Four questions designed for the thoughts that logic can't seem to touch.
Best for: Replaying events, resentment, "they should have..." thoughts
Break It Down
Spiral separator
For spiralling thoughts. Separates what's fact from what's assumption, and focuses on what can actually be tested or controlled.
Best for: Perfectionism, fear, uncertainty, catastrophizing
Just Write
Free writing
No structure, no prompts. For when you need to empty your head before you can examine anything. Thought dump first — process after.
Best for: Overwhelm, processing emotions, brain dumping before a session
The difference
How it's different from Daylio and Reflectly
Daylio is a mood tracker. You log your mood, tag your activities, and see patterns in how you feel over time. It's useful for what it does — but it tells you how you feel, not why, and it doesn't do anything with the thought underneath the mood.
Reflectly is a guided journal. It asks you reflective questions and gives you prompts. It's closer to what Noisefilter does — but the questions aren't based on what you've actually written, and there's no structured framework for examining a specific thought.
The difference with Noisefilter is specificity.
You don't log a mood. You write the specific thought that's bothering you. The app works through that thought with you — not a generic prompt about gratitude or your day.
The other difference is resolution. Daylio and Reflectly track and store. Noisefilter tracks, stores, and processes. Your thoughts have a status — active, working on it, resolved, settled. Over time you see which thoughts have been worked through and which ones keep coming back.
That second category is where the real pattern work happens.
How a session works
From thought to clarity.
Most sessions take 10–20 minutes.
Write the thought
The specific thought — not a category. Not "I'm anxious about work." The thought itself. "I think I said something that upset my colleague on Thursday and I don't know how to fix it."
Choose a reflection method
Noisefilter suggests one based on what you've written. You can override it. Most people stick with the suggestion — the pattern matching is accurate.
Work through it
AI-guided questions, one at a time. Each builds on your answer to the last. Usually 10–20 minutes for a first pass on a specific thought.
Read your analysis
After each session: which cognitive distortions came up, how your emotional intensity changed from start to finish, and what to do with what came up.
Track over time
Each thought stays in your diary with its session history. You can return to it, add sessions, mark it resolved. Over weeks, you start seeing the patterns.
What people are working through
“I processed a thought I'd been carrying for 8 months. One session.”
“I kept journaling the same things over and over. This actually moved them.”
“My therapist assigns CBT homework between sessions. This is basically that — but I can do it at midnight when the thought hits.”
Common questions
Plain answers, no jargon.
Learn the technique
How to start CBT on your own →
The structured approach to self-guided CBT, step by step.
Related
What to do before therapy →
Using the waiting period — or the space between sessions — productively.
Get the app
Download Noisefilter free →
Screenshots, session flow, and app details.
Before you commit
See pricing →
Free plan and Pro — upgrade only when you need more.
The thought that's been in your head — write it down tonight.
Not to store it. To work through it. 3 free sessions every month. No credit card. The thought diary app that goes further than the diary.
Android 8.0+ required. Free account needed to save sessions. Noisefilter is not a crisis service — if you are in crisis, please contact a crisis line in your country.