The exact number of testers you need on a test comes down to what your objectives are, and your team's decision making process. Here are a few recommendations from our team:

  • Start Small: Begin with 5-8 users. In early development stages, this initial round can generally reveal  about 80% of the most critical issues.
  • Iterate and Test Again: As your design becomes more refined, more tests can help catch less obvious issues and ensure all major problems have been addressed. Testing with 15-20 users can provide deeper insights.
  • Regular Testing: Repeat your user tests at least every two weeks. This ensures constant feedback for you and your team.

Remember to start the user testing process as early as possible as feedback can significantly shape the direction and quality of your product.