Every Type of AI Agent, Compared
You keep hearing "AI agents" and everyone means something different. Voice bots. Sales reps. Customer service. Personal assistants. Coding tools.
Here's what each one actually does, what it costs, and which one solves your problem.
Personal AI Agents
AI helpers connected to your real communication channels — email, WhatsApp, calendar — and grounded in the Business Brain they work from. They draft useful work, surface next steps, and keep review in front of anything customer-facing. Learn more about AI helpers →
BrainRoad
Our ProductPrivate Business Brain for operators who need continuity, not just automation. Drafts email, lead follow-up, scheduling next steps, and content from your real context while keeping review controls inside an isolated helper workspace.
Self-Hosted OpenClaw
Open-source runtime for teams that want to build their own operating layer. You control the stack, but you also own the work of turning a runtime into something dependable.
Best for: Developers building their own identity and governance layerAI Voice Agents
These agents make and receive phone calls. Inbound answering, outbound prospecting, appointment booking, customer support over the phone. If your business runs on calls, this is the category to watch.
Vapi
Developer-first voice agent platform with phone and web integration, tool calling, and multi-assistant orchestration. Highly customizable but requires technical setup.
Best for: Deep customizationRetell AI
No-code/low-code voice agent platform for inbound and outbound calls. Configurable conversation flows with fast deployment.
Best for: Fast deployment without codeBland AI
Voice agents focused on large-scale calling campaigns and enterprise integrations. Built for volume.
Best for: High-volume callingPlay.ai
Voice agents for inbound and outbound sales, qualification, and appointment booking. Quick to deploy with pre-built voice personas.
Best for: Quick deployment with voiceAI Sales Agents
These agents prospect, qualify, and nurture leads at scale. They write outbound emails, research prospects, and fill your pipeline without you touching a spreadsheet.
Regie.ai (RegieOne)
AI sales engagement platform with agentic prospecting. Automates outbound sequences, finds contacts, and personalizes outreach at scale.
Best for: Pipeline generationArtisan (Ava)
Autonomous AI sales rep that handles outbound demand generation end to end — from lead research to personalized emails to follow-up sequences.
Best for: Hands-off outboundAI Customer Service Agents
Enterprise platforms for support teams. Ticket deflection, omnichannel routing, agent coaching, knowledge base integration. These replace or augment your help desk, not your personal workflow.
Sierra
AI agent platform for customer experience across chat, email, and voice. Designed for brands that care about CX quality as much as ticket volume.
Best for: Premium brand experienceForethought
AI agent platform for support teams, trained on your existing knowledge base and ticket history. Resolves common questions before they reach a human.
Best for: Ticket deflection and resolutionAda
Omnichannel AI customer service platform with agent coaching, playbooks, and integrations with major CRMs and helpdesks.
Best for: Enterprise omnichannel supportPolyAI
Voice-first omnichannel platform for conversational customer support. Handles complex, multi-turn support conversations over the phone.
Best for: Voice-heavy support centersAI Coding Agents
Different category entirely. These help you write, review, and debug code — not run your business. Included here because people searching for "AI agents" often land on these.
Claude Code
Anthropic's terminal-based coding agent. Reads your codebase, makes edits, runs tests, and handles multi-file refactors autonomously.
Best for: Complex multi-file changesCursor
AI-native code editor built on VS Code. Inline completions, chat with your codebase, and agentic multi-step editing.
Best for: IDE-integrated coding assistanceDevin
Autonomous AI software engineer by Cognition. Handles full development tasks from spec to PR, including browsing, planning, and debugging.
Best for: Delegating entire dev tasksGitHub Copilot
GitHub's AI pair programmer. Inline code suggestions, chat, and PR summaries. The most widely adopted coding AI.
Best for: Everyday coding productivityHow to Choose the Right AI Agent
Name the problem. "I spend 3 hours on email" is a personal agent problem. "We get 500 support tickets a day" is a customer service agent problem. "I need to cold-email 10,000 prospects" is a sales agent problem. Start there.
Check the channel. Phone calls? Voice agents. Email and messaging? Personal or sales agents. Website chat and tickets? Customer service agents. The channel narrows the field fast.
Match team size to price. Solo or small team? You don't need enterprise pricing. BrainRoad starts free. Enterprise with 50+ support reps? You need Sierra or Ada, not a personal agent platform.
Test before you commit. Most platforms on this page have free tiers or trials. Spend 15 minutes, not 15 hours. If it takes longer than a single afternoon to evaluate, it's probably not the right fit for your stage.
Stack, don't replace. These categories aren't exclusive. Many businesses use a personal agent (email and scheduling) alongside a voice agent (phone answering) and a sales agent (outbound). Start with one, add as needed.
Here's the math most people skip
You spend 30 minutes a day on email triage alone. That's 182 hours a year. 23 lost workdays. At $100/hour, that's $18,250 in time you can't bill.
A human assistant who handles that costs $2,000–5,000/month. ChatGPT Pro is $200/month — and it still can't text you at 6am with your schedule.
A BrainRoad agent costs $29/month. It runs 24/7. It remembers everything. It never quits.
You already know which type of agent you need.
Build the Brain your AI helper works from: files, notes, examples, customer details, and service rules. Free to start. No credit card. Running in 15 minutes.