Most established add-to-calendar vendor
AddEvent is the most established add-to-calendar vendor in October 2026 (SOC 2 Type II (public SOC 3 report), running since 2015). AddEvent has a free plan that allows up to 100 calendar adds per event a month and scores 59/100 overall. Runner-up: AddCal (running since 2020).
Prices last verified . Checked weekly.
How we pick: 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. Same data and rubric as every other page; see the methodology.
| # | Tool | Score | Free plan | Paid from | Small | Growing | High volume | Prices checked |
|---|---|---|---|---|---|---|---|---|
| 1 | AddEvent | 59 | Yes · trial 7d | $36/mo | $36 | $129 | no fit | |
| 2 | AddCal | 84 | Yes | $15/mo | Free | $15 | $25 | |
| 3 | Add to Calendar PRO | 56 | No · trial 7d | $2.25/mo | $2.25 | $19 | $189 | |
| 4 | CalendarLink | 59 | Yes · trial | $23/mo | $23 | $23 | $47 | |
| 5 | CalGet | 47 | Yes | $21/mo | $21 | $21 | no fit | |
| 6 | SpreadEvent | 31 | Yes · trial 14d | $33/mo | $33 | $33 | no fit |
Costs are the cheapest plan billed monthly (or the yearly price ÷ 12 when no monthly price is published) that covers each usage scenario. "No fit" means no published plan covers it. Order: score, then name. Affiliate status is not an input.
Questions
Which add-to-calendar vendor is the most established?
AddEvent is the most established add-to-calendar vendor in October 2026 (SOC 2 Type II (public SOC 3 report), running since 2015). AddEvent has a free plan that allows up to 100 calendar adds per event a month and scores 59/100 overall. Runner-up: AddCal (running since 2020).
How do we pick?
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. Same data and rubric as every other page.