Available on iOS

Notice the pull.
Think clearly.

A daily practice for thinking clearly in a world your brain wasn't built for.

Download on the App Store

iOS · Free to start

183
Cognitive biases mapped
6
Philosophical lenses
140
Progression levels
5
Practice surfaces

What's inside

See yourself thinking.

Five surfaces. One daily practice. A reasoning trainer built around the patterns that shape your thinking without asking permission.

Scanner

Daily bias cards personalized to your weakest patterns. Notice what's pulling your thinking before it lands.

Journal

Sealed decision entries with a timed autopsy. Write what you believe now — revisit what actually happened.

Vault

183 cognitive biases. Six philosophical lenses. Your growing library of thinking tools, browsable and searchable.

Progress

Calibration curves. A Brier score. Data that tells you how well your beliefs actually track reality over time.

Insights

AI Intake reads any article, URL, or YouTube video and returns a Cognitive Nutrition Label — no algorithm to feed.

How it works

A practice, not a library.

Most apps show you the biases. Lensward builds fluency with them — through a daily loop that compounds.

1

Spot the pattern

The Scanner surfaces a daily selection personalized to your weakest cognitive category. You read, reflect, and mark what resonated.

2

Record what you believe

Seal a prediction or decision entry. The app timestamps it and sets an autopsy date. Your beliefs are on record before the outcome is known.

3

See how your thinking tracks

As resolved predictions accumulate, your calibration curve takes shape. You stop guessing about your blind spots — you can see them.

Privacy-first

Your thinking stays yours.

Cognitive humility starts with trusting the tool. Lensward is offline-first, BYOK, and built so your reasoning practice never becomes someone else's data.

  • Offline-first — your journal, predictions, and progress live on your device
  • BYOK AI — bring your own API key; your text never passes through Lensward servers
  • No engagement loop — opt-in gamification, no streak anxiety, no algorithm to feed
  • Local bias scoring — personalization runs on-device, not in the cloud

Start noticing the pull.

Free to download. No subscription required to begin.

Download on the App Store

iOS — Available now