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API · /ical-api

iCalendar API

healthy 3,836 Subscribers

Build a valid RFC 5545 iCalendar (.ics) event from simple parameters — and get ready-to-use "add to calendar" links for Google, Outlook, Office 365 and Yahoo. Pass a title, start and end (ISO 8601 or unix timestamps, in UTC) — or a duration in minutes, or an all-day flag — plus optional location, description, URL, organizer, an RRULE recurrence (e.g. FREQ=WEEKLY) and a reminder (a VALARM N minutes before). The service returns the fully-formed .ics text with correct escaping and 75-octet line folding, a base64 data: URI you can drop straight into a download link, and the four calendar deep-links. A second endpoint parses raw .ics text back into structured JSON events. Everything is computed locally with no network calls, so it is fast and deterministic. Built for booking and scheduling flows, event pages, email "add to calendar" buttons, reminders and no-code automations. A calendar-event builder — distinct from date/time math (datetime), public-holiday data (holidays) and the Jewish calendar (hebcal). No upstream key, no cache.

#icalendar #ics #calendar #events #scheduling #rfc-5545
api.oanor.com/ical-api
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Machine-readable spec so AI agents can integrate this API.

/api/ical-api/openapi.json
/api/ical-api/llms.txt

Discovery: GET /api/index.json lists every API.

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
115 ms
Server probes · 24h
Subscribers
3,836
active
Total calls
0
last 7 days
status Full status page → · 3 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 2,280 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 2,280 calls/month
  • 2 req/sec
  • .ics + calendar links
  • No credit card
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Starter

€6.65 /month

  • 45,000 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 45k calls/month
  • 8 req/sec
  • RRULE + VALARM + parse
  • Email support
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Pro

€21.20 /month

  • 232,000 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 232k calls/month
  • 20 req/sec
  • Booking & scheduling apps
  • Priority support
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Mega

€55.50 /month

  • 860,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 860k calls/month
  • 50 req/sec
  • Calendar-platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Jewish Calendar API

The Jewish calendar as an API — powered by Hebcal. Convert any date between the Gregorian and Hebrew calendars (with the formatted Hebrew date and the Jewish events falling on that day), list the Jewish holidays of any year — major and minor festivals, Rosh Chodesh and special Shabbatot — each with its English and Hebrew name, date and category, and get this week's Shabbat candle-lighting time, Torah portion (parashah) and Havdalah time for any location by GeoNames id or coordinates. From Rosh Hashanah and Yom Kippur to Passover, Shavuot and Hanukkah, with Hebrew dates rendered in Hebrew script, it is ideal for calendar, scheduling, event, religious and cultural applications. A Jewish-calendar resource — distinct from secular public-holiday and Islamic prayer-time APIs. Open data from Hebcal (CC-BY 4.0 / GPL).

api.oanor.com/hebcal-api

Prayer Times & Islamic Calendar API

Islamic prayer times, the Hijri calendar and the Qibla direction as an API. Get the five daily prayer times — Fajr, Dhuhr, Asr, Maghrib and Isha, plus sunrise, sunset, Imsak and midnight — for any coordinate and date, calculated with your choice of method (Muslim World League, ISNA, Umm al-Qura, Egyptian, and many more), alongside the matching Hijri date; convert any date between the Gregorian and Hijri (Islamic lunar) calendars in either direction; and get the exact Qibla direction — the compass bearing and great-circle distance from any location to the Kaaba in Mecca. Prayer times and calendar conversion are powered by the Aladhan service; the Qibla is computed directly. Ideal for Muslim prayer and lifestyle apps, mosque and community sites, Ramadan tools and calendars, and any app that needs accurate prayer times or Hijri dates. Open data.

api.oanor.com/prayer-api

On This Day API

Historical events, notable births and deaths, and holidays for any calendar date — "on this day in history" — relayed live from Wikipedia. Get today's curated highlights, or pass any date (e.g. 07-20 → Apollo 11 Moon landing among the events) to retrieve notable events, births, deaths, holidays/observances, or the editor-selected highlights. Every entry carries the year, a one-line description and a link to the relevant Wikipedia article. Ideal for "today in history" widgets, daily-content apps, trivia, newsletters and educational tools.

api.oanor.com/onthisday-api

Moon API

Everything about the Moon from one fast, fully-local API. Get the current (or any date) lunar phase with illumination percentage, age in days, phase angle and waxing/waning state, plus the matching emoji; list the upcoming principal phases (new, first quarter, full, last quarter) with accurate UTC timestamps; render a full monthly lunar calendar; and look up the Moon’s zodiac sign and ecliptic longitude. Phase instants are computed with Jean Meeus’ astronomical algorithms and are accurate to about a minute. Every endpoint takes an optional ISO date and works by GET or JSON POST. Pure server-side compute with no third-party upstream, so responses are instant and always available. Ideal for calendar and weather apps, photography and astronomy tools, gardening, fishing and astrology features.

api.oanor.com/moon-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for iCalendar API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call iCalendar API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for iCalendar API?
Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.
How much does iCalendar API cost?
iCalendar API has a free tier with 100 calls / month. Paid plans start at €6.65 / month with higher quotas and faster rate limits.
Can I cancel my subscription anytime?
Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.
Is iCalendar API GDPR-compliant?
All requests to iCalendar API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/ical-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/ical-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/ical-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);
import requests
r = requests.get(
    "https://api.oanor.com/ical-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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