Thanks for the detailed feedback – it’s always useful to hear, and I’ll pass it on :)
One small feature you may not be aware of: on our website, Splitwise does allow you to add group members without email addresses, which hopefully helps for the “large party” scenario. My apologies that the same feature isn’t available on our mobile apps!DaRkWiNG supported this idea ·DaRkWiNG commented
@admin: It's been 3 years since you replied to this question but the Splitwise mobile app on iOS still does not support adding people with contact info (email/contact#). While I commend the app itself, which has been designed next to perfect, on the other hand, I would also seek the developers to capture such feedback and roll out these features as enhancements.