You can easily collaborate with external users (guests) through the shareable board section. There is a limit to the amount of guests you are able to invite according to the plan you have purchased.
I am on a trial account
If you are on a Trial, the amount of users and guests you can invite to your account is unlimited. If you ever decide to move to a paid subscription, please ensure before upgrading that you have the correct amount of guests and users according to the plan you will pick.
I am on a standard plan
On the standard plan, the amount of guest is limited. You can invite up to 3 guests for free. The 4th guest will count as a billed user. This means that if you go for the standard plan 5 users, you can invite a total of 5 users and 3 guests.
You can also play around with the amount and invite for instance 4 users and 7 guests (4 guests = 1 billed user = 5 in total + another 3 guests).
I am on a pro or enterprise plan
On both of these plans, the amount of guests you can invite to your account is unlimited :)
If you have any questions about Shareable Boards, please feel free to contact us at Support@monday.com, our awesome Customer Success Team will be more than happy to answer any questions you may have!