The best alternatives to Tuple are Repl.it, Coding Rooms, and hackajob. If these 3 options don't work for you, we've listed a few more alternatives below.
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Snowflake O'Reilly Report— Design a Modern Application Data Stack
Coding Rooms is a real-time platform for teaching programming online that allows teachers to engage with their students’ code instantly. Our video conferencing, assessments, and auto-grading enable teachers to easily monitor and track student progress.
A real-time, Pair Programming platform for live code discussion, technical interview with Chat feature. ✅Realtime collaboration ✅Built from scratch ✅Light weighted ✅Chat with peers in the same room ✅No time limit ✅Unlimited room creation