Best Alternatives to Vapi

11x provides AI digital workers for sales development, featuring Alice the AI SDR for autonomous outbound email prospecting and Julian the AI Phone Agent for intelligent voice conversations. The platform handles end-to-end sales development workflows including prospect identification, research, personalized outreach, follow-ups, and meeting scheduling — operating 24/7 to generate qualified pipeline at a fraction of the cost of human SDR teams.

From ~$5,000/month

Agency Swarm is a free, open-source Python framework that lets you build teams of AI agents that work together like a real organization. You can create different agent roles (like CEO, developer, assistant) and define how they communicate and collaborate to complete complex tasks automatically.

From Free

Comprehensive .NET toolkit for AI agent evaluation featuring fluent assertions, stochastic testing, model comparison, and security evaluation built specifically for Microsoft Agent Framework

From Free

Open-source Docker-based development environment specifically designed for LangChain AI agent experimentation, featuring QuestDB time-series database, Grafana visualization, Code-Server web IDE, and Claude Code integration for autonomous agentic development workflows

AI-powered contact center platform with power dialer, business SMS, AI voice agents, and CRM integrations for sales and support teams.

Build, deploy, and manage autonomous AI agents that use foundation models to automate complex tasks, analyze data, call APIs, and query knowledge bases — all within the AWS ecosystem with enterprise-grade security.

From Pay per token

Revolutionary open-source AI framework enabling self-building autonomous agents that generate, store, and execute functions dynamically using LLM-powered code generation.

From Free

AI observability platform with Loop agent that automatically generates better prompts, scorers, and datasets from production data. Free tier available, Pro at $25/seat/month.

From Free

Generate ultra-realistic AI voices with 90ms latency, emotion control, and laughter synthesis for real-time conversational applications, voice agents, and interactive experiences across 40+ languages

CodeMender is an AI-powered agent from Google DeepMind that automatically improves code security by patching vulnerabilities and proactively rewriting code to eliminate classes of security issues.

AI meeting assistant built specifically for professional services firms—consulting, legal, and accounting—that automatically generates meeting summaries, action items, and follow-ups in real time. Cogram uses context-aware AI to understand industry-specific terminology and client relationships, then pushes structured outputs directly into CRMs and project management tools so nothing falls through the cracks between meetings and execution.

AI meeting assistant that automatically generates meeting minutes, tracks action items, and summarizes discussions in real-time. Integrates with CRMs and project management tools for automatic follow-up. Designed for revenue teams needing structured, searchable meeting intelligence with minimal manual effort.

AI-powered meeting assistant that automatically takes notes during calls and meetings, eliminating the need for manual note-taking.

AI computer agent for macOS that controls your browser, writes code, handles documents, and operates Google Apps through voice commands with direct DOM control.

AI agent for customer service that delivers high-quality answers and resolves complex customer support queries across email, live-chat, phone, and social channels.

AI Agent for customer service that delivers high-quality answers and resolves complex customer support queries across email, live-chat, phone, and social channels.

AI meeting assistant that automatically transcribes, summarizes, and analyzes meetings across Zoom, Google Meet, Teams, and more with conversation intelligence.

Real-time, speech-native voice AI platform that processes audio directly without text conversion, enabling fast, natural voice conversations for AI agents with sub-second latency and preservation of paralinguistic signals.

From Free

Conversational AI platform providing virtual agents, smart chatbots, voice automation, and AI-driven content creation for customer service automation.

Ghost is an AI-powered presentation agent that automatically generates polished, professional slide decks from simple text prompts, documents, or outlines — enabling users to create visually compelling presentations in under 60 seconds rather than the 3–8 hours typical of manual design.

Zhipu AI's flagship open-source large language model designed specifically for agentic AI applications, featuring 355B total parameters with 32B active per inference and MIT licensing.

AI-powered meeting notepad that combines real-time transcription with your own notes to produce rich, structured summaries. Unlike bot-based tools like Otter.ai or Fireflies that join calls as visible participants, Granola runs locally and listens via your device's audio—no meeting bot required. Add personal context, highlights, and action items alongside AI-generated notes for a hybrid approach that captures both what was said and what you thought.

AI-powered assistant by xAI that supports text and voice chat, image and video generation, real-time web search, and code generation.

The first agentic product demo platform where prospects receive personalized demos in video calls instantly.

AI voice agents that automate lead pre-qualification for BPOs and call centers with direct SIP integration. Connects to VICIdial and Trackdrive to filter voicemails and unqualified leads, then warm-transfers qualified prospects to human closers in under 0.5 seconds response time.

Enterprise conversational AI platform for building intelligent virtual assistants with voice, chat, and process automation capabilities.

From Contact

LiveKit Agents: Real-time media infrastructure platform with an integrated agent framework for building voice and video AI assistants that can participate in live conversations. Enables developers to create AI agents that can see, hear, and speak in real-time video calls, with support for spatial audio, screen sharing, and multi-participant interactions.

From Free

Murf AI: AI voice generation platform offering 200+ ultra-realistic text-to-speech voices in 35+ languages for voiceovers, audiobooks, and presentations.

Developer platform for building integrations with Notion workspaces. Access databases, pages, and content programmatically for AI agent workflows.

From Contact

AI-powered voice assistant for productivity that enables 10x faster dictation with context-aware formatting and voice control for third-party apps.

Advanced AI academic writing assistant that transforms research writing with contextual grammar checking, intelligent paraphrasing, automated reference discovery from 250M+ scholarly articles, and comprehensive pre-submission quality checks optimized specifically for academic manuscripts.

From Free

Platform for creating and deploying lifelike voice AI agents for customer interactions and automated conversations.

Real estate-trained AI that automatically handles incoming calls, qualifies leads, and schedules appointments so agents never miss potential business.

Regal is a voice AI agent platform that helps businesses build, improve, and manage AI agents for customer conversations. It supports sales and customer engagement workflows using AI-powered voice automation.

Text to speech and voice typing AI assistant with AI voice generation, voice cloning, and dubbing capabilities.

AI writing assistant specifically designed for creative fiction and storytelling, offering tools like Story Engine, Write, Expand, Rewrite, Describe, and Brainstorm to help novelists and fiction authors draft, revise, and develop their narratives.

From $19/month

Enterprise voice AI platform that automates phone calls using AI voice agents for both inbound and outbound communications. Handles call routing, appointment booking, voicemail detection, and SMS follow-ups with CRM integrations.

No-code AI voice agent platform for building conversational phone agents that handle calls, bookings, and support.

From Free (build & test); from $29/mo for live calls

AI phone agent platform for building human-like voice agents that handle inbound and outbound calls for businesses.

From $0.15/minute

Breakthrough real-time voice AI infrastructure that processes speech natively without ASR conversion, delivering human-like conversational agents with sub-300ms time-to-first-token latency at $0.05/minute.

AI-powered document processing tool that turns documents into structured, machine-readable Markdown and extracts key fields from various document types including invoices, forms, and reports.

Full-service AI based Personal Concierge Platform offering customizable voice assistants and text assistants to revolutionize business communication.

AI writing assistant that helps rewrite, paraphrase, and improve text clarity and tone across emails, documents, and content creation with intelligent suggestions that maintain your unique voice while optimizing for better communication impact.

From Freemium

AI-powered meeting assistant that automatically takes notes and provides meeting summaries during Zoom calls.