Dev tools · alternatives · 2026
24 alternatives to Kalendis – Scheduling API (keep your UI, we handle timezones/DST)
Kalendis is an API-first scheduling backend. You keep your UI; we handle the gnarly parts (recurrence, time zones, DST, conflict-safe bookings). What it does: • MCP tool: generates typed clients and API route handlers (Next.js/Express/Fastify/Nest) so you can scaffold calls straight from your IDE/agent tooling. • Availability engine: recurring rules + one-off exceptions/blackouts, returned in a clean, queryable shape. • Bookings: conflict-safe endpoints for creating/updating/canceling slots. Why we built it: We kept rebuilding the same "hard parts" of…
Kalendis is an API-first scheduling backend that handles timezone conversions, daylight saving time, recurrence rules, and conflict-safe bookings. Developers keep their own user interface while delegating the complex… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.
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Kalendar.work▲336A free fully featured Calendly alternative
Jan 2026 · kalendar.work · its alternatives →
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Cal.com Platform▲1,601Build your pixel-perfect booking experience with Atoms
2024 · cal.com · its alternatives →
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Recal.dev▲365Resend, but for Calendar & Scheduling. API. SDK. MCP.
2025 · recal.dev · its alternatives →
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Make a beautiful embeddable booking widget in minutes.
2015 · timekit.io · its alternatives →
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You might have noticed that there have been a lot of KDE releases this week, like Plasma 5.24 and Plasma Mobile Gear. Keen to hop onto this train, those of us in the Kalendar team are happy to reveal Kalendar version 1.0. We are even happier to announce that this will be the final version of Kalenda
2022 · claudiocambra.com · its alternatives →
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European, GDPR-native scheduling alternative to Calendly
Sep 2026 · kalendarius.com · its alternatives →
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⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API - iamkun/dayjs
2018 · github.com · its alternatives →
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Hi! I've built this because I kept reaching for Celery for simple scheduled tasks and it felt like overkill. I just needed "run this function every hour" or "daily at 9am", not distributed workers. So it's decorators for scheduling (@scheduler.every(5).minutes, @scheduler.daily.at("09:00")), state saves to JSON so jobs survive restarts, and there's an optional FastAPI dashboard if you want to see what's running. No Redis, no message broker, runs in-process with your app. Trade-off is it's single process only — if you need distributed workers, stick with Celery.
Jan 2026 · github.com · its alternatives →
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Time zone converter, meeting scheduler + video conferencing
2017 · apps.apple.com · its alternatives →
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Leadmonk▲114Scheduling software for the mobile-first business world
2023 · leadmonk.io · its alternatives →
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Hi HN! This is something I've been tinkering on for the past couple months. It's basically just an API/CLI for scheduling delayed or recurring jobs as HTTP requests. I initially built it as a personal tool to save myself a bit of time on little side projects where I've needed scheduled/recurring alerts, but decided it could be a good opportunity to practice building out a nice landing page [0] and documentation [1]. And who knows, maybe someone else will find it useful ¯\_(ツ)_/¯ The tool relies heavily on Elixir's Oban [2] library for managing jobs, and Mintlify [3] for…
2023 · booper.dev · its alternatives →
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Slack butler who will take care of the timezone differences
2019 · timezone-butler.vercel.app · its alternatives →
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Kafka-based Job Queue for Python. Contribute to joowani/kq development by creating an account on GitHub.
2016 · github.com · its alternatives →
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Hey HN, I'm Alex, founder of Interval [0]. We’re bringing internal tools written like CLIs to the browser to make them more powerful, through a Node.js SDK which attaches them to a hosted dashboard without any frontend code. Large companies have full teams that work on internal dashboards and tooling. Interval brings that infrastructure to anyone. In our previous project we had ~65 CLI scripts for tasks like provisioning user accounts, moderating content, and migrating data. These were quick to write and powerful. They also turned into an ongoing timesuck. Non-technical coworkers needed to…
2022 · interval.com · its alternatives →
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Highly performant, global, point on earth to timezone API
2022 · timezonesapi.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →