p2horizon

Answers one question at a glance: can I fly a paramotor, right now, from here?

It pulls current and forecast conditions, compares them against thresholds the pilot set themselves, and renders a single green / amber / red verdict with the reasons behind it. It needs JavaScript, a location, and limits you have entered — nothing on this page is a verdict about anywhere.

The four screens

Verdict — the current call for your location or a saved site, a dashboard of analog and digital gauges, and a three-day hourly timeline trimmed to the legal daylight window. Scrubbing the timeline moves the gauges with it.
Map — controlled airspace and active TFRs around the site, drawn from FAA sources.
Log — flights entered by hand or imported from GPX and IGC, rated in words rather than stars, with the wing and motor recorded against each one.
Settings — thresholds as bands, launch sites and their headings, equipment, and opt-in condition alerts.

The rules it is built on

These are hard rules rather than preferences, and they are enforced in the test suite rather than remembered:

The verdict is the worst single threshold, never an average and never a weighted score. A blended number invites a pilot to launch on a 7 / 10.
A threshold is either sourced or empty. The app seeds no defaults of its own; an unattributed number gets read as a recommendation. Most ship blank until the pilot's own log fills them.
Green reads within your limits, and nothing stronger. The app knows nothing about the pilot's currency, fatigue, gear, or the rotor behind the treeline.
Failure is never silent. A source that cannot be reached reads as unavailable, never as clear. A blank map must never look like empty sky.
Stale data downgrades the verdict, and the age of the data is always on screen.
Suggestions never auto-apply. Loosening a limit takes many clean flights and small increments; tightening can fire off one bad flight. The asymmetry is deliberate.
Nothing keeps score. The app never counts, ranks or rewards, because pushing a pilot toward a marginal day causes real harm.
An alert is never a guarantee. Background delivery is best-effort everywhere and absent on some platforms, so silence never means conditions are holding.

Where the data goes

Nowhere. There is no account, no login and no sync: sites, limits and flights live in this browser's local storage and are exportable to JSON and CSV. The one thing that ever leaves the device is an opt-in condition alert, which sends the coordinates to watch and the limits to compare against, and nothing else.