Why We Built an Offline Moon Tool
Not every tool needs a server. The moon phase is a great example of something that should just work, anywhere, forever.
The phase is pure maths
The moon's phase at any moment follows from orbital mechanics, so there is no reason to fetch it from an API. By computing it in the browser we remove the things that usually go wrong: rate limits, outages, API keys, and the privacy cost of pinging a third party every time you check the moon.
Better for everyone
The result is a tool that loads fast, works on a plane or a campsite with no signal, and never tracks you. It also means we can show a live 30-day calendar instantly without dozens of network calls. The forecast is different — live weather genuinely needs a data source — which is why only the Forecast tool goes online, and we are upfront about that.
Try the moon tool — it even works offline.
Open the Moon Phase tool