Build and deploy AI voice agents at scale | Paid | - **Multi-Provider Stack**: Vapi lets developers choose from many STT, LLM, and TTS providers (e.g., OpenAI GPT‑4, Anthropic Claude, Gemini, Deepgram, ElevenLabs) and mix them to suit performance, cost, and voice quality. You have full control over each component in the voice pipeline.
- - **Flow Studio Visual Builder**:Vapi includes visual workflow tools that let you design conversational flows, logic, branching, API calls, and responses in a visual interface or through API configurations.
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Live SEO and business data inside your AI agent | Free tier | - **SEO Research Inside Your Agent**: Ask in plain English for keyword ideas, search volume, keyword difficulty, live Google SERPs, and domain or competitor analysis. You don't have to switch to a separate SEO suite.
- - **Backlinks and Site Audits**: Pull a backlink overview, referring domains, and a competitor link-gap analysis. You can also run on-demand audits of up to 50 pages per run.
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Production cloud on autopilot for AI-built apps | Freemium | - **Persistent backend hosting**: Run always-on processes, background workers, and scheduled jobs. Modelence builds, deploys, and restarts them, and it notices when a job stops running.
- - **Managed databases**: When your app declares MongoDB, PostgreSQL, or Redis, Modelence provisions it and wires in the connection URL. Backups, failover, and connection handling are included.
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AI-guided product specs for teams and coding agents | Free tier | - **Guided questions (Ask)**: Wisary asks about assumptions and edge cases, ranked by importance. It starts from the context you've already given, so you only answer what's still open.
- - **Reviewable AI diffs (Refine)**: Every AI suggestion shows up as a diff you can approve or reject. You can dismiss questions that don't apply, and you stay the author of the document.
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Local screen and audio memory for your AI tools | Free tier | - **Screen and audio capture**: Combines accessibility data, screen frames with OCR fallback, and audio transcripts. You get a full record of what you saw and heard across apps and meetings.
- - **Timeline search and recalll**: Search your history in natural language or scrub back through your day. You can find a specific screen, document, or conversation and pick up where you left off.
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Open source framework for real-time voice AI agents | Free tier | - **Multimodal Orchestration**: Coordinate voice, video, text, and images in a single pipeline with frame-level control. You decide exactly how data moves through your agent.
- - **200+ Swappable Providers**: Switch speech-to-text, LLM, text-to-speech, and vision services, usually with one line of code. You can test a new model without rewriting your app.
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Test, evaluate, and monitor your AI agents in one place | Freemium | - **Agent Simulations**: Run simulated text and voice users against your agent over many turns. You can write scenarios in plain language, run them locally or in CI/CD, and use them for red teaming. A judge agent reads the full trace and explains each verdict.
- - **Evaluations**: Score single outputs or whole conversations with an LLM judge, custom code, or a full workflow. Run evals from a notebook or the UI, on live production traffic, or pairwise to compare models, prompts, and versions.
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AI receptionist and business agent for local businesses | Free tier | - **24/7 AI Receptionist**: Answers inbound calls with a real conversation instead of voicemail or a phone tree. It captures the caller's name, number, address, service need, urgency, and custom fields, then hands off anything that needs a human.
- - **Business Phone Line**: You get a dedicated number for calls and texts on iOS, Android, and the web. You can keep your current number by forwarding or porting it, or pick a new one.
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Run coding agents in parallel, each in its own worktree | Freemium | - **Parallel Git Worktrees**: Every task runs in its own isolated git worktree. Send one prompt to several agents, compare what they produce, and merge the best version.
- - **Broad Agent Support**: Claude Code, Codex, Cursor CLI, Gemini, Copilot, OpenCode, and Pi come preconfigured. You can also run Grok, Amp, Goose, Cline, Kiro, Qwen Code, or any other CLI agent.
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