Recommendations for Sales Gamification Apps for HubSpot CRM

Hi there, A client is looking to add a sales gamification app to our CRM (HubSpot). They don’t have a massive sales team (5), but all reps work on the road (mobile-friendly). We’re looking for basic recognition, leaderboard, and competition features. Multi-lingual. I have my eyes on a few solutions, but what do you fine folks use/have used/recommend?