How invite-only sign-ups work and when they pay off

Limit who can join so you can grow in waves and keep early users engaged.

Impact
Low
Effort
Medium
Filed under
Acquisition, Referral
Updated

An invite-only sign-up means new users can join only if an existing user, or you, send them an invitation. It works when your product is better with the people already in it (a network, a community, a marketplace), when you need to add users slowly so the product holds up, or when you want early users who care. It is a poor fit for a tool that anyone can use alone on day one, because the gate just slows down people who would have paid.

How to do it

  1. Decide why you are gating. Two honest reasons: you cannot support everyone yet, or each new user makes the product better for the others. "It sounds exclusive" is not enough.
  2. Put a request form on a landing page instead of a sign-up form. Ask for an email and one question that tells you who they are (role, use case). Say what happens next and roughly when.
  3. Let people in by waves. Invite a small group, watch what breaks, then send the next batch. Clubhouse's founders said an invite system let them add users in waves without often breaking.
  4. Give early members a few invites each. Gmail's launch plan was to invite about 1,000 opinion leaders and let them invite their friends and family. Cap the number so each invite feels worth something.
  5. Make the invite link do the work. It should carry the inviter's name, skip the waitlist, and drop the new user straight into a useful first screen. If invited users have to repeat the form, you lose them.
  6. Set the exit before you start. Decide what will make you open to everyone (capacity, a number of active members, a launch date) so you do not run a gate you no longer need. See also viral waiting list and limited availability.

Examples

  • Gmail. Per Wikipedia's history of Gmail, the 2004 limited beta started with about 1,000 invited opinion leaders who could then invite others. Invitations sold on eBay for as much as US$150, according to PC World as cited there. Invitations were no longer required from February 2007.
  • Dribbble. Its own about page says it began in 2009 as a small, invite-only space for designers to share work and feedback.
  • Clubhouse. It used an invite system from March 2020 until July 21, 2021, when it opened to everyone. Invite codes sold on eBay for up to $400 during the rollout, per Wikipedia. When the gate came down, TNW reported that the app had already struggled to keep its early momentum. This is the case to study for what happens when the invite novelty fades.

When it backfires

  • The gate hides weak retention. Clubhouse's downloads fell from a February 2021 peak of 9.6 million to 922,000 in April, according to Sensor Tower data cited by TNW (the fall happened while invites were still required). Scarcity gets people to sign up. It does not make them come back.
  • Invites can be sold. Both Gmail and Clubhouse invites ended up on eBay. If invites have a price, expect some to be resold.
  • Emailing invites for rewards can make you the sender. If you reward users for sending invitation emails, you may be treated as the sender under CAN-SPAM, which defines to "procure" a message as paying or providing other consideration to, or inducing, someone to send it on your behalf. You then have to follow CAN-SPAM's sender rules, such as including an opt-out. Ask a lawyer before building paid invite emails.
  • Fake scarcity. Do not say "only 50 invites left" if that is not true. See limited availability for the rules on this.
  • Slow growth. Some people will not bother. If you do not need to ration, skip the gate and run a referral program instead, as in newsletter referral programs. On a waitlist page, an exit-intent popup can ask a leaving visitor for an email once.

Questions people ask

What does invite only mean? Only people who have been invited can sign up or attend.

Is it "invite only" or "invitation only"? Both are used and mean the same thing.

What are invite-only websites? Sites where you need a code or an invite from a member to create an account. Dribbble and Gmail both started that way.

Sources

Launching soon? This is one of the pre-launch marketing tactics, listed in the order to start them.

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