GrayCloud
a modern Dark Sky alternative
Details
- External ID
- 48398410
- Source
- HN
- Company
- —
- Product
- GrayCloud
- Website domain
- graycloud.app
- Launched
- June 4, 2026
- Cohort
- —
- Upvotes
- 8
- Upvotes percentile
- 0.4952185792349727
- Tags
- —
- Fetched at
- Sept. 7, 2026, 9:26 p.m.
- Updated at
- Sept. 7, 2026, 9:26 p.m.
Description
I miss Dark Sky, so I built my own weather app.Here's how GrayCloud works: * Raincast: minute-by-minute rain prediction and accumulation tracking for your exact location * Forecasts: 10 day forecasts use multiple high resolution sources and correct for bias at your location. * Alerts: rain starting, stopping, severe weather, daily summary and more * Widgets: home and lock screen widgets * Multi-platform: apple watch and mac appsI use NOAA and ECMWF models for core weather data and a custom model to compute rain accumulation and the next 60 minute radar movements.I also offer Apple WeatherKit as an alternative weather source.
Enrichment
- Theme
- Vertical
- Horizontal
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Commercial product
- Normalized one-liner
- weather api service
- Manually corrected
- False
Could you build this?
Partial Building the multiplatform weather UI is vibe-codeable, but Dark Sky-style minute-by-minute rain prediction requires ingesting massive raw NOAA MRMS/HRRR radar raster datasets and running computer vision precipitation tracking models.
What it would actually take: A real version requires an ingest pipeline downloading real-time NEXRAD radar and NOAA HRRR model arrays, projecting them onto spatial grids, and running optical flow / advection algorithms to extrapolate precipitation down to minute-by-minute intervals. The processed tiles and predictions must then be served via an ultra-low-latency spatial API to native clients.
Discussion
No comments on this launch.
Competitors
Other products that read as similar to this one — 74 launches clear the similarity bar, closest 8 shown.
Attention rank: #38 of 75 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 208 days after the earliest competitor.
- Sensecast · ph · 2026-09-30 · 2 upvotes · similarity 0.53
- linecast · hn · 2026-08-23 · 9 upvotes · similarity 0.52
- Experiments with Weather Data · hn · 2026-07-29 · 6 upvotes · similarity 0.50
- Weather Today · ph · 2026-09-12 · 1 upvotes · similarity 0.50
- Ranking weather models by how their forecasts turned out · hn · 2026-08-06 · 7 upvotes · similarity 0.50
- Brolly, a plain-text weather forecast site · hn · 2026-07-25 · 228 upvotes · similarity 0.50
- FitCast: Weather & Activity · ph · 2026-09-16 · 1 upvotes · similarity 0.48
- Windows 95–style Weather App for iPhone · hn · 2026-03-28 · 12 upvotes · similarity 0.48
Other launches for this product
- No other launches for this product.
Same idea, different domain
Nobody's really built a dev tools tool for Sales yet.