We've been using it on https://formspree.io/ https://formspree.io/ and Trello handles it well up to 100 or more cards on the screen. If you archive the cards, h

We've been using it on https://formspree.io/ https://formspree.io/ and Trello handles it well up to 100 or more cards on the screen. If you archive the cards, however, either at the time you reply or periodically ("Archive all cards in this list"), it will be much easier and Trello can handle practically unlimited archived cards.