XP Engine
Engagement engine (levels 1-99, 23 XP sources, daily/weekly missions, 6-tier leagues, streaks, titles) as an embed SDK. No paid API.
The proven stack behind this solution
Pre-built modules covering everything you need to launch.
Productized straight from a high-traffic live app.
Full source and deploy scripts cut your timeline dramatically.
A modular backend designed for production traffic.
30 languages and ATT-free, privacy-first by default.
Full source and infra scripts, priced per project.
Source + deploy/customization + 3-month support