# Add to Calendar Lab

> Independent comparisons of add-to-calendar tools, with every price sourced and re-checked weekly. One published 100-point rubric for every tool; affiliate links never affect scores or order. Prices last verified 2026-10-26.

The highest-scoring add-to-calendar tool in October 2026 is AddCal (84/100), ahead of AddEvent (59/100). The best pick depends on what you need, so see the "best for" table.

## Rankings
- [All tools compared](https://addtocalendarlab.com/): ranked table with scores, free plans and cost at three usage levels
- [Pricing compared](https://addtocalendarlab.com/pricing): every plan and the cheapest plan per usage scenario
- [Best free add-to-calendar tool](https://addtocalendarlab.com/best/free): AddCal. Has a $0 plan. Ranked by our Free plan score (what you can do at $0). Tools level on this measure are shown as joint picks.
- [Best add-to-calendar tool for high volume](https://addtocalendarlab.com/best/high-volume): AddCal. Cheapest plan that covers 100 events/month, 30,000 adds/month, API access and 5 seats.
- [Best add-to-calendar tool for developers](https://addtocalendarlab.com/best/developers): AddCal. Has a documented REST API. Ranked by our Developer & automation score. Tools level on this measure are shown as joint picks. Free libraries are listed separately.
- [Best add-to-calendar tool for webinars and events](https://addtocalendarlab.com/best/webinars-and-events): AddCal. Has RSVP forms. Ranked by our RSVP & subscription calendars score. Tools level on this measure are shown as joint picks.
- [Best tool for subscribable event calendars](https://addtocalendarlab.com/best/publishers): AddCal. Has subscription calendars and an embeddable calendar for your website. Ranked by the monthly price of the cheapest plan that includes both. Tools level on this measure are shown as joint picks.
- [Best add-to-calendar tool for teams](https://addtocalendarlab.com/best/teams): Add to Calendar PRO. Has a plan with unlimited team members. Ranked by the monthly price of the cheapest such plan. Tools level on this measure are shown as joint picks.
- [Most established add-to-calendar vendor](https://addtocalendarlab.com/best/established-vendors): AddEvent. Has an independent security audit of the vendor (SOC 2 or ISO 27001) first, then the most years in operation, counting earlier names. Tools level on this measure are shown as joint picks.

## Tool reviews
- [AddCal](https://addtocalendarlab.com/tools/addcal): AddCal has a free plan with unlimited calendar adds, and paid plans start at $15/month billed monthly. It scores 84/100 on our published rubric, ranking #1 of 6 tools we compare.
- [AddEvent](https://addtocalendarlab.com/tools/addevent): AddEvent has a free plan that allows up to 100 calendar adds per event a month, and paid plans start at $36/month billed monthly. It scores 59/100 on our published rubric, ranking #2 of 6 tools we compare.
- [CalendarLink](https://addtocalendarlab.com/tools/calendarlink): CalendarLink has a free plan that allows up to 50 calendar adds per event a month, and paid plans start at $23/month billed monthly. It scores 59/100 on our published rubric, ranking #3 of 6 tools we compare.
- [Add to Calendar PRO](https://addtocalendarlab.com/tools/add-to-calendar-pro): Add to Calendar PRO has no free plan, and paid plans start at $2.25/month billed yearly. It scores 56/100 on our published rubric, ranking #4 of 6 tools we compare.
- [CalGet](https://addtocalendarlab.com/tools/calget): CalGet has a free plan that allows up to 50 calendar adds per event a month, and paid plans start at $21/month billed monthly. It scores 47/100 on our published rubric, ranking #5 of 6 tools we compare.
- [SpreadEvent](https://addtocalendarlab.com/tools/spreadevent): SpreadEvent has a free plan that allows up to 100 calendar adds per event a month, and paid plans start at $33/month billed monthly. It scores 31/100 on our published rubric, ranking #6 of 6 tools we compare.
- [Add to Calendar Button](https://addtocalendarlab.com/tools/add-to-calendar-button): free developer option. A JavaScript web component that renders an add-to-calendar button for Google, Apple, Microsoft 365, Outlook.com, Teams, Yahoo and a generated .ics file. Free to self-host; RSVP, hosted .ics files and an API are part of the separate paid Add to Calendar PRO service.
- [calendar-link (npm)](https://addtocalendarlab.com/tools/calendar-link-npm): free developer option. A small MIT-licensed JavaScript/TypeScript library that builds add-to-calendar URLs for Google, Outlook.com, Office 365, Microsoft Teams, Yahoo and AOL, plus an .ics file as a data URL. It suits developers who want links without any hosted service; there is no UI, RSVP or analytics.
- [Hand-rolled links and .ics files](https://addtocalendarlab.com/tools/manual-links): free developer option. Building Google Calendar, Outlook.com, Office 365 and Yahoo "add event" URLs by hand and offering a downloadable .ics (RFC 5545) file for Apple Calendar, Outlook desktop and other clients. No cost or account, but no updates after adding, no RSVP and no analytics unless you build them.

## Comparisons
- [AddCal alternatives](https://addtocalendarlab.com/alternatives/addcal)
- [AddEvent alternatives](https://addtocalendarlab.com/alternatives/addevent)
- [CalendarLink alternatives](https://addtocalendarlab.com/alternatives/calendarlink)
- [Add to Calendar PRO alternatives](https://addtocalendarlab.com/alternatives/add-to-calendar-pro)
- [CalGet alternatives](https://addtocalendarlab.com/alternatives/calget)
- [SpreadEvent alternatives](https://addtocalendarlab.com/alternatives/spreadevent)
- [AddEvent vs AddCal](https://addtocalendarlab.com/compare/addevent-vs-addcal)
- [AddEvent vs CalGet](https://addtocalendarlab.com/compare/addevent-vs-calget)
- [AddEvent vs SpreadEvent](https://addtocalendarlab.com/compare/addevent-vs-spreadevent)
- [AddEvent vs CalendarLink](https://addtocalendarlab.com/compare/addevent-vs-calendarlink)
- [AddEvent vs Add to Calendar PRO](https://addtocalendarlab.com/compare/addevent-vs-add-to-calendar-pro)
- [AddCal vs CalGet](https://addtocalendarlab.com/compare/addcal-vs-calget)

## Guides
- [How do I add an add-to-calendar link to an email?](https://addtocalendarlab.com/guides/add-to-calendar-link-in-email): How to put add-to-calendar links in Gmail, Outlook and Mailchimp emails, why JavaScript buttons fail in email, and links vs .ics files.
- [Why do add-to-calendar buttons break in Outlook?](https://addtocalendarlab.com/guides/add-to-calendar-outlook-problems): Why add-to-calendar links fail in Outlook desktop, web and mobile: wrong deeplink host, time zones, all-day dates, .ics encoding and line endings, with fixes.
- [What is an .ics file and how does it work?](https://addtocalendarlab.com/guides/ics-files-explained): What an .ics calendar file is, the required fields under RFC 5545, a minimal valid example, time zones, recurrence, and why downloaded events don't update.

## Data and method
- [Full data as Markdown](https://addtocalendarlab.com/llms-full.txt): every tool's plans, limits, features and scores
- [Data (JSON)](https://addtocalendarlab.com/data/tools.json), CC BY 4.0
- [Methodology](https://addtocalendarlab.com/methodology): rubric, scoring formulas, test protocol
- [Disclosure](https://addtocalendarlab.com/disclosure): affiliate relationships
- [Changelog](https://addtocalendarlab.com/changelog): every price change and correction, dated