AI Agents

Top 12 alternatives to Synthflow

No-code AI voice agents for booking, support, and sales calls. Here are 12 other ai agents tools — ranked by rating, review volume, and how well they overlap with your existing stack.

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The tool you're comparing

Synthflow

No-code AI voice agents for booking, support, and sales calls

From ~$0.08/min + plans

12 alternatives

OpenClaw

Open-source AI agent for messaging, browser automation, and smart home control

Free / open-source

Google Gemini

Google's flagship AI assistant — across search, workspace, and daily life

Free / Google AI Plus, Pro and Ultra

Claude Code

Agentic coding tool by Anthropic for the terminal

Usage-based / included in Max plan

Lindy AI

Build custom AI employees for email, CRM, sales, and support — no code needed

Free (400 credits/mo) / from $49.99/mo

Manus AI

Autonomous AI agent that browses, codes, and builds apps in the background

Free (300 credits/day) / from $39/mo

Genspark

AI Super Agent that handles entire workflows end-to-end

Free / from $25/mo

Microsoft 365 Copilot

AI assistant embedded across Microsoft 365 apps

$30/user/mo add-on

Sim

Open-source AI workspace to build, deploy, and manage agents

Free / Pro $25/user/mo / Max $100/user/mo

CrewAI

The leading platform for orchestrating multi-agent AI teams

Free (OSS) / Enterprise custom

Cline

Open-source VS Code AI agent that runs on your own API keys

Free (pay own API costs)

Sierra AI

Conversational AI agents for customer experience

Custom pricing

Workato ONE

Enterprise iPaaS unifying integration, orchestration, and agentic AI

From $833/mo

How we ranked these

Alternatives are scored on a blend of average rating, review volume, integration overlap with Synthflow, and editorial verification. We exclude apps from other categories so you only see real like-for-like options. All listings are independent — no tool pays to appear here.