Yes, SunriseSunset.io is free to use with no time limit and no usage cap that forces a paid upgrade. The free plan includes up to 365 days of daily data per request. No credit card is required to sign up.
About
SunriseSunset.io provides a keyless JSON API for sunrise, sunset, twilight, golden hour, blue hour, and moon data for any point on Earth. It accepts latitude and longitude on a single GET request and returns times, azimuth, altitude, moon phase, timezone, and related fields in JSON.
The service is aimed at developers who need astronomical timing data without signup or API key management. The free offering includes unlimited-looking usage language such as "millions of requests / month" and "up to 365 days" per request, but the page also states that commercial use requires a visible backlink to SunriseSunset.io.
- Keyless GET endpoint
- Latitude and longitude query parameters
- Sunrise, sunset, and twilight fields
- Golden hour and blue hour windows
- Moonrise, moonset, and phase data
- Up to 365-day date ranges
- Cloudflare Workers edge deployment
- Visible backlink required for commercial use
Free Tier Value
This free tier is perpetual and requires no signup, API key, or credit card, so there is no paid-plan-style gate to price against. It does have a practical attribution requirement and usage constraints like one GET per query and a 365-day maximum range, but the offer is still broadly usable for small and even fairly heavy projects, so the most defensible monthly value is left unpriced rather than forcing a made-up comparison.
What's included in the free tier
Verified
- Free keyless API access for sunrise, sunset, twilight, golden hour, and moon data.
- No signup, API key, or credit card required.
- One GET request per query.
- Up to 365 days of daily data per request.
- Visible backlink attribution required for free commercial use.
- Cloudflare Workers edge delivery with fast response times.
- CORS-enabled browser access to the API.
See SunriseSunset.io pricing for current limits.
Common questions
Is SunriseSunset.io free forever?
Yes. SunriseSunset.io is free forever, with no time limit and no usage threshold that forces a paid plan.
Does SunriseSunset.io require a credit card?
No. You can start on SunriseSunset.io's free tier without entering card details.
