Threshold: VFR Go/No-Go

METAR, TAF and the GAFOR. Three sources. Three different answers. Threshold gives you the fourth, on your Lock Screen, against the minima you set on the ground.

Can I fly?

You can answer that in two seconds, on the Lock Screen, against the minima you set when no one was rushing you. Threshold is the two-second go/no-go for UK and EU private pilots, on iOS.

The METAR says one thing. The TAF says another. The GAFOR says a third. Threshold reads all three, checks them against your personal minima for the nearest licensed airfield, and surfaces a single verdict: GO, HOLD, or NO. With the rule that produced it one tap away.

This is not a weather app. It is a contract with yourself.

You decide once, on the ground, calm. Five sliders: cloudbase, visibility, wind, crosswind, gust. Four presets: Solo, Dual, Cross-country, Night. The app enforces what you said when no one was rushing you. If you nudge a limit while the verdict was HOLD or NO, the drift detector notices and surfaces it quietly in Settings. Not a banner. Not a notification. A single quiet row that asks: "you raised this limit while the verdict was HOLD. Was that the call you wanted?"

WHAT YOU GET . Lock Screen and Home Screen widgets that surface GO, HOLD, or NO at a glance. . Live Activity that watches your planned departure window and flips when conditions move. . 928 UK and EU licensed airfields at launch, plus nearest-aerodrome fallback for unlicensed strips. . 12-hour TAF trend timeline that shows you not just "now" but "what's coming". . Runway-specific crosswind, computed against the active runway for the reported wind. . Raw METAR and TAF, one tap from the verdict, with every metric linked to the line that produced it. . Quiet push notifications on verdict flips inside your watch window. No newsletters, no upsell, no engagement loops. . Drift detector: every change to your personal minima is logged with the verdict and ICAO at the moment of the edit.

SHOW THE WORKING

Every threshold has a documented rule. Every verdict explains why in plain English. The explanation is template-driven, so identical inputs always produce identical words. You can reproduce the verdict by hand. Full rule documentation lives at flythreshold.com/verdicts.

SOURCES

METAR and TAF: aviationweather.gov global ADDS feed; EUROCONTROL B2B for UK and EU. Airfield and runway reference: OurAirports, refreshed per release. Threshold never invents or interpolates values. When data is stale or missing, you see STALE, EXPIRED, or "?" instead of a confident wrong answer.

PRIVACY

No accounts. No analytics on widget content. Personal minima live on-device, in SwiftData. Location is processed on-device and never transmitted. No tracking, no third-party SDKs reading your behaviour.

PRICING

Threshold is a subscription. £3.99/month or £29/year. Founder's pricing of £19/year is locked for the first 100 TestFlight members, for the life of the subscription. No free tier: the widget IS the product, and the work that goes into the rules and the sources is real.

BUILT BY A PILOT

Built at White Waltham (EGLM) by a PPL holder who got tired of bouncing between five tabs at 06:00. Years of personal minima in a Notes file. The maths was never the hard part. Being honest about it was.

Threshold doesn't decide. You decide, on the ground, calm. The app enforces.

TERMS OF USE

By downloading Threshold you agree to Apple's Standard Licensed Application End User Licence Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Questions: fly@flythreshold.com How verdicts work: flythreshold.com/verdicts Press: press@flythreshold.com