caldays.com

What It Is

caldays is a service that aggregates global calendars, public holidays, long-weekend planning, and world clocks, while also providing a JSON API for developers. Its web experience emphasizes mobile-first design, fast loading, and localized presentation, with support for 16 languages. The API pricing page says holiday data covers 195 countries, while the long-weekends page lists 206 countries.

Core Features and Developer Capabilities

Core modules include country calendars, upcoming public holidays, bridge days/long-weekend planning, world clocks, time zone comparison, countdowns, date calculation, and date differences. For developers, it offers three main types of endpoints: retrieving holidays by country and year, retrieving long-weekends, and clock/time zone conversion. The free read API has a low barrier to entry; the text mentions that no API key is required, with CDN caching and roughly 50ms latency, making it suitable for embedding into SaaS, travel, scheduling, payroll, or marketing systems.

Pricing and Deployment

Pricing is fairly straightforward: Free is $0 with 10,000 requests/day; Starter is $9/month with 100,000 requests/day; Pro is $29/month with 1,000,000 requests/day; and Enterprise is custom, including unlimited requests, a 99.99% SLA, self-hosting/on-prem deployment, custom holiday data imports, and Slack support. Starter and Pro include a 14-day trial with no credit card required. Payments are processed through Stripe and support major cards, Apple Pay, and Google Pay; enterprise customers can pay by wire transfer.

Pros and Cons

Its strengths are a generous free tier, low pricing, a simple API, and CC BY 4.0 licensing that allows commercial use. It also supports long weekends and time zone features, making it more than just a static holiday table. The limitations are that its terms explicitly advise verifying critical use cases with official sources, and future-year dates for Easter, Islamic calendar holidays, and lunar-calendar-based holidays may be inaccurate. Common enterprise software capabilities such as team permissions, SSO, audit logs, and compliance certifications are not disclosed.

Who It’s For and Access from China

It is well suited to indie developers, small and midsize SaaS products, multinational team tools, and travel or scheduling products. The text does not provide information about access from mainland China, and local payment methods such as Alipay or WeChat Pay are not listed. If network stability, data compliance, or local payment options are important, it may be worth evaluating alternatives such as Google Calendar API, Nager.Date, and Calendarific as well.