#6 · Best free option for developers · Updated 2026-10-07
add-to-calendar-button (open source)
7.2Quick verdict
A free, open-source web component you embed in your own site. Very flexible, but it requires coding, offers no hosted links for emails and no analytics.
All conclusions come from independent research: hands-on testing of every tool, cross-checked against vendor documentation, pricing pages, changelogs and public user reviews. Read the full methodology.
Scores
| Criterion | Weight | Score |
|---|---|---|
| Calendar coverage | 20% | 9.0 |
| Features | 20% | 7.0 |
| Ease of use | 15% | 6.5 |
| API & integrations | 15% | 6.0 |
| Analytics | 10% | 2.0 |
| Privacy & GDPR | 10% | 9.5 |
| Pricing & value | 10% | 10.0 |
| Overall | 100% | 7.2 |
Pros
- Free and open source
- Highly customisable
- No account needed
Cons
- Requires development work
- No analytics
- Not usable in emails
Features
| Hosted event links | No |
| Works in emails | No |
| Website button | Yes |
| Event landing pages | No |
| Calendar subscriptions | No |
| Analytics | No |
| API | No |
| Type | Open source |
| Pricing | Free (open-source licence). |
| Website | https://github.com/add2cal/add-to-calendar-button |