Updated Jan 27, 2026 · v1.0.3
Write down the thoughts that are on your mind today. AI will quietly read them and discover thought patterns you weren't aware of. You're not alone.
We have countless thoughts every day. But are these thoughts always objective? "Why am I always like this?" "Everyone will look at me strangely." "I'm sure I'll fail again." If these thoughts frequently occur, you may have an invisible filter called "cognitive bias" operating in your mind. Bias Diary is a novel diary app that records your daily thoughts and emotions, and AI analyzes hidden cognitive biases. 【What is Cognitive Bias?】 Cognitive bias is a thinking error we unconsciously commit. Typical examples include interpreting the same situation only negatively, magnifying a small mistake into a total failure, or believing a judgment made under intense emotion as fact. Psychological research shows that the human brain uses various thought shortcuts (heuristics) to conserve energy. Cognitive biases arise from this process. The problem is that these biased thought patterns cause unnecessary stress, anxiety, and depression, and sometimes even negatively impact interpersonal relationships and important decisions. An even bigger problem is that most people are completely unaware of the biases in their own thought patterns. Just as a fish cannot perceive water, we find it difficult to objectively view our thoughts. A bias journal solves this problem. 【How does a bias journal help?】 Cognitive behavioral therapy (CBT) focuses on recording and reviewing "automatic thoughts." However, analyzing your own thought patterns alone can be challenging. The bias journal's AI reads your journal and identifies and informs you of any cognitive biases hidden within it. Like a wise friend quietly listening to your story, it provides gentle yet accurate feedback. 【Key Features】 ◆ AI Cognitive Bias Analysis When you keep a journal, the AI identifies cognitive biases hidden in your thoughts. • All-or-Nothing Thinking This is an extreme way of thinking that divides everything into success or failure, perfection or worthlessness. "If I don't get a perfect score on a test, it's meaningless." • Overgeneralization This is the error of applying one or two experiences to all situations using words like "always" or "never." "That person didn't contact me. No one likes me." • Emotional Reasoning This is the thinking error of accepting emotions as evidence of fact. "I'm anxious, so something must be wrong." • Mind Reading This is the error of inferring and making assumptions about others' thoughts without sufficient evidence. "I can tell by the look on that person's face that they're ignoring me." • Catastrophizing This is the thinking pattern of over-exaggerating the negative consequences of a situation and expecting only the worst. "If I mess up that presentation, my career is over." • Disqualifying the Positive This is the thinking error of ignoring or downplaying positive experiences. "I got complimented, but it was probably just a formality." • Should Statements This is the mindset that judges oneself and others based on strict rules of "should." "I must always be perfect. I can't make mistakes." We also analyze various cognitive bias patterns. ◆ Customized Feedback and Alternative Perspectives We don't simply point out biases. AI suggests alternative perspectives that allow you to view situations with a more balanced perspective. We help you broaden your thinking through gentle suggestions like, "Couldn't you think about it this way?" Understanding, not criticism; suggestions, not criticism. The bias journal respects your thoughts while opening up new perspectives. ◆ Easy Journaling Freely write down your thoughts and feelings of the day without complicated forms or structured questions. You can easily record them on the subway during your commute, during a quick lunch break, in bed before bed, or whenever you're feeling overwhelmed. Just write honestly without being constrained by formalities. The AI will analyze the rest. ◆ Discover Your Thought Patterns Recognize your own unique thought patterns that emerge over time. Understanding which biases frequently appear in which situations can help you avoid falling into the trap of repeating the same thoughts. Self-awareness is the first step to change. 【 Recommended for 】 • Those who repeatedly experience negative thoughts in the same situations • Those who want to think objectively without being swayed by emotions • Those interested in self-reflection and mental health • Those interested in or experienced cognitive behavioral therapy (CBT) • Those who want to make journaling a habit • Those who want to effectively manage stress and anxiety • Those who want to make better decisions • Those who want to increase self-esteem 【 Usage Examples 】 Example 1) "I stuttered once during my presentation today, and everyone probably thought I was incompetent. Now I'm out of the running for a promotion." → Biases analyzed: mind-reading, catastrophizing, overgeneralization → Alternative perspectives: One small mistake doesn't diminish the value of the entire presentation. Audience members are more likely to focus on the content and remember the entire presentation, not just specific moments. Example 2) "My friend read my message and didn't reply. I must have done something wrong. I always make people feel bad." → Biases analyzed: Mind reading, overgeneralization, personalization → Alternative perspectives: There are many reasons for delayed replies. They may be busy, or they may have put off responding properly later. [Get Started] When your thoughts change, your feelings change. When your feelings change, your actions change. When your actions change, your life changes. Small changes in your thoughts can lead to big changes in your life. Start your journey to self-understanding with a bias journal now. Record your thoughts today and meet your tomorrow.
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