Spaced Repetition Chatbot Development

I want an AI-powered interactive chatbot that keeps me on track with spaced-repetition study and helps me improve my long-form, subjective answers. It should run in the browser and as a desktop app, sharing a single user account and database so I can switch devices without losing progress... (Budget: $250 - $750 SGD, Jobs: AI Chatbot Development, Desktop Application, Natural Language Processing, Node.js, Python, Svelte, Vue.js, Web Application)