Volcast - Solar Forecast
Weather
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Plan your energy use around the sun. 7-day hourly forecasts, widgets,
Home Assistant integration — now more accurate than ever. Start your
free trial.
Maximize your solar investment with Volcast – the ultimate PV production forecast tool.
Stop guessing when the sun will power your home. Volcast provides an accurate, hour-by-hour solar production forecast for your PV system, covering today and the next 7 days. Designed by solar owners for solar owners, Volcast helps you align your energy-heavy tasks with peak production windows to maximize self-consumption.
SMART HOME & HOME ASSISTANT INTEGRATION
Volcast features a professional REST API for Home Assistant users. Export your forecast data directly to your HA dashboards to automate your smart home based on solar availability.
ADVANCED PHYSICS-BASED ENGINE
We combine real-time satellite irradiance data with a high-fidelity physics engine. We account for:
Multi-String Support: Perfect for complex east-west or multi-roof systems.
Bifacial Panels: Specialized modeling for modern modules.
AI Auto-Calibration: Our algorithms learn your system's performance over time.
Horizon Profiling: Accounts for shading from terrain and obstacles.
KEY FEATURES:
7-Day Precise Forecast: Hour-by-hour power prediction.
Hourly View Toggle: Switch each hour between forecast, actual production, and the difference at a tap.
Multi-Device Sync: Production history and calibration stay in sync across every device you sign in on.
Notification Center: Evening forecasts, snow warnings, and peak window alerts.
Privacy First: Secure processing, no ads, no third-party tracking.
PLANS & PRICING:
Free: 48-hour high-accuracy forecast.
Premium (monthly or yearly): Full 7-day forecast, AI calibration, and Home Assistant API access. Start with a 7-day free trial.
Terms of Use: https://volcast.app/terms
Privacy Policy: https://volcast.app/privacy
Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. You can manage subscriptions in your App Store account settings.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Consistent forecast numbers everywhere — the daily total in the header,
widgets and calibration screen now always matches the hourly chart, and
no longer shifts around after you log your production
• More accurate forecasts — better freezing-weather handling, snow cover
now carries across forecast days, and improved low-sun modeling
(biggest gains on winter days and early mornings)
• Compass fix — "Measure from nature" now reads your panel direction
correctly on tilted surfaces and in the Southern Hemisphere
• Ground-mounted systems get a more accurate horizon by default
• Instant fixes — we can now deliver small improvements over the air,
without waiting for a store update
• Stability and reliability improvements
The developer, Michal Bartosiak, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- Contact Info
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Michal Bartosiak
- Size
- 71.9 MB
- Category
- Weather
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Volcast Premium · Yearly $39.99
- Volcast Premium Lifetime $44.99
- Volcast Premium · Monthly $4.99
- Copyright
- © 2026, Michał Bartosiak
