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Every voice/agent platform now ships some combination of a workflow builder, a knowledge base, and telephony. The honest differentiator isn’t any single feature — it’s that most vendors bundle three of these four and bolt on the fourth from a separate company:

• Wetel vs. ElevenLabs Agents — voice quality and native workflow/RAG vs. a bolted-on avatar
• Wetel vs. HeyGen — a photorealistic GPU avatar vs. a conversational orchestration platform
• Wetel vs. Retell AI — a visual builder with native avatar vs. one built for telephony-first voice agents
• Wetel vs. Bland.ai — a deterministic-graph, telephony-core product vs. an open, self-hostable one

Each page below is re-checked against the vendor’s own current docs, not a cached comparison table — pricing and capabilities in this space move fast enough that a stale comparison is worse than none.