Why Biases Matter
Cognitive biases are systematic errors in thinking that affect everyone. By understanding them, you gain the power to make more rational, intentional choices.
About DebiasDaily
We believe better thinking starts with awareness. DebiasDaily helps you recognize the cognitive biases that shape your decisions — one calm, focused lesson at a time.
Mission
Built for Calm
No noise, no clutter. DebiasDaily is designed to feel like a moment of clarity — a quiet space to learn something meaningful each day.
One Day at a Time
Consistency beats intensity. We surface one bias per day so you can absorb it fully, reflect on it, and carry the insight forward.
Content and sources
Where the content comes from
DebiasDaily covers 83 cognitive biases, heuristics, psychological effects and decision-making phenomena, hand-curated into six categories: Core Thinking, Memory & Perception, Social, Decision-Making, Logical & Reasoning, and Behavioral & Everyday. Entries were selected for how often they show up in everyday decisions and how actionable it is to spot and counter them.
Definitions and explanations are grounded in established research, including the seminal work of Amos Tversky and Daniel Kahneman, Kahneman's Thinking, Fast and Slow, and the broader cognitive-science literature. The quiz scenarios are written to reflect situations where these biases actually show up in everyday life.
For a detailed list of primary research references and the methodology behind bias selection, see the Sources and methodology page
Accuracy
How we keep it accurate
Entries are written in plain language from the cognitive-science literature and paired with practical counter-strategies. Sources are added only after a human maintainer verifies them against the live page, and corrections from readers are taken seriously — see below.
Privacy
Your privacy
DebiasDaily does not intentionally collect your name, email address, or other contact details, and there are no accounts or sign-ups. Your learning data — daily progress, streak, bookmarks, quiz results, reflections, and decisions — stays in your browser's local storage on your device.
When online, the app uses Google Analytics 4 to understand which features are useful. Google Analytics is loaded only after you provide consent through the banner or Settings. GA4 may process approximate technical information such as device type, browser, session activity, and location at a regional level. Reflection text, quiz decisions, and TTS content are not sent. Analytics counts are estimates rather than exact numbers of people. For more details, see Google's Privacy Policy.
Offline, a small set of activity events (a lesson viewed or a quiz completed) may be queued on your device and sent the next time you reconnect. Activity from devices that never reconnect cannot be measured. Clearing your browser data may reset analytics identifiers and local progress, and there is no cross-device identity or synchronization. No browser fingerprinting is used, and analytics data is never sold.
Educational disclaimer
Educational use only
DebiasDaily is for general education and self-awareness. It is not medical, psychological, financial, or legal advice, and does not diagnose or treat any condition. If you're facing significant personal or mental-health challenges, please reach out to a qualified professional.
Corrections
Report a correction
Spotted an explanation that seems wrong or a scenario that doesn't quite fit? We'd love to know. Open a GitHub issue with the bias name and what you believe should change, and we'll review it.