Offer a Cloud service to collect product requirements?

Question

Preparation of terms of reference

Good afternoon colleagues,
I am looking for a simple and convenient service for collecting product requirements. Everything reviewed in reports and articles from google are monsters or require significant funds to use or not in the cloud. Main criteria: SaaS, ease of use and interface, no frills and the need to integrate with something else, the presence of categorization of requirements.
Can you recommend something? Beyond Excel.
Thank you in advance

Answer 1

maybe trello

Answer 2

https://www.productboard.com/