Pascal Changelog

All notable changes to Pascal are documented here.

[1.3] - 2026-03-01

Added

Altitude Chart: Toggle between pressure and GPS altitude history views
Zambretti-Aligned Confidence: Prediction confidence now follows classical meteorological research
Developer Tools: Expanded debug mode with Data Inspector, ML Inspector, Sync Status, and Live Sensor

Improved

Smarter Predictions: Confidence properly reflects signal clarity (rapid changes = high confidence, slow changes = lower)
Level Confirmation: Predictions boosted when pressure level confirms forecast (e.g., low pressure + storm)
Reversal Penalty: Confidence reduced when trend just changed direction

Developer Tools (tap version 7x to unlock)

Data Inspector: View calibration breakdown, movement filtering stats, GPS coverage
ML Inspector: Model state, observation count, condition distribution, force re-bootstrap
Sync Status: Watch connectivity diagnostics, force sync
Live Sensor: Real-time barometer readings with polling mode

Technical

ZambrettiConfidence struct for structured confidence calculation
InteractiveAltitudeChartView for GPS altitude history
ChartDisplayMode setting for pressure/altitude toggle
Added CaseIterable to CalibrationMethod for debug UI

[1.2] - 2026-02-23

Added

On-Device Machine Learning: Personalized weather predictions that learn automatically
Instant Bootstrapping: Uses existing pressure history to personalize immediately
Adaptive Forecasting: Combines 110-year-old Zambretti algorithm with modern ML
Overnight Sampling: Charging-aware background scheduling for better overnight coverage
Diurnal Correction: Removes natural daily pressure cycle for more accurate trend detection
Storm Alerts: Push notifications for rapid pressure drops and storm conditions
Live Activities: Dynamic Island and Lock Screen pressure display (iOS 16.1+)
Flight Mode: Cabin pressure tracking with altitude estimation

Fixed

Background processing tasks now run properly overnight when charging

How ML Works

Pascal learns your local weather patterns automatically — no user action required:

Instant bootstrap — Seeds model with Zambretti archetypes on first launch
History training — Walks through existing pressure data to create observations
Auto-evaluation — After 6 hours, Pascal checks what actually happened
Kernel likelihood — Similar past conditions inform future predictions

Result: If you have a week of pressure history, Pascal is personalized immediately. New users reach personalization after ~25 auto-evaluated predictions.

All learning happens silently in the background. No feedback buttons needed.

Technical

WeatherMLModel.swift - On-device ML with k-NN classification
FeatureExtractor.swift - Rich feature engineering with diurnal correction
StormAlerts.swift - Push notification system with cooldown
LiveActivityManager.swift - ActivityKit integration
PredictionTracker.swift - Prediction tracking + ML training data
FlightMode.swift - Flight detection and cabin altitude

[1.1] - 2026-02-22

Added

Weather Forecasting: On-device prediction using Zambretti algorithm
Prediction Confidence: Visual confidence indicator (4-bar display)
Trend Classification: 7-level trend system (Rising Rapidly → Falling Rapidly)
Forecast Card: Weather prediction display in main app view

Fixed

GPS continuation double-resume crash
Race condition in manual refresh
Calibration data loss when storing readings
Chart boundary interpolation
Delta calculations with multi-tier fallback

Technical

WeatherPredictor.swift - Zambretti-based prediction engine
WeatherPredictionView.swift - Forecast UI components
IQR-based outlier detection in PressureCalibration.swift

[1.0] - 2026-02-01

Initial Release

Real-time barometric pressure monitoring
12-hour interactive pressure chart
Hybrid calibration system (movement + GPS)
iOS Home Screen widgets (small, medium, large)
Apple Watch app with complications
Background sampling via location changes
Rate-of-change filtering for movement detection
Sea-level pressure reduction

Technical

SwiftUI throughout (100% native)
CMAltimeter for pressure sampling
CoreLocation for GPS altitude
WidgetKit for widgets/complications
WatchConnectivity for iPhone-Watch sync