Sealed: Predictions

Write down what you think will happen and how sure you are. It locks until the date you chose. Then it tells you how often you're right.

You think you know what will happen. Sealed makes you find out.

Write a prediction, say how sure you are, and pick the date you will know. It seals. Until that date nobody can read it back — not even you. All you see is the label you gave it and a countdown.

When the day comes, the seal breaks and you meet your own words: what you said, why you thought it, and how confident you were. Then you mark yourself right or wrong.

That is where the interesting part starts. Sealed keeps the one number almost nobody keeps about themselves — how often the things you were 80% sure about actually happened. Say 80% and be right half the time and it will tell you so, level by level, and in plain words: "You say 83% on average and you are right 67% of the time. You run 16 points overconfident."

Nothing leaves the phone. There is no account to make, no server holding your predictions, and nothing to subscribe to. It works on a plane.

• Seal a prediction until a date you choose — minutes away or ten years away • Six confidence levels, each explained in odds you can feel • A vault of what is sealed, what is ready to open, and what you have judged • Your calibration, level by level, with a chart and a plain-English verdict • Reminders when something is ready to open, naming only the label • Export what you have opened as Markdown; sealed predictions are never in it • Sixteen example predictions to load, so the numbers mean something on day one • Works entirely offline. No account, no analytics, no subscription.