The Agents Index

The Agents Index is a researched directory that tracks 95 AI agents across 9 categories, providing verified datasheet-style summaries of what each agent is made of, what it costs, and whether it holds under load. Every listing is researched from primary sources and re-verified on a published cadence, so the index functions as a reference you check before wiring an agent into a system.

What is The Agents Index?

The Agents Index is a web-based directory of AI agents and agentic tools. It compiles structured data for 95 agents across 9 categories including coding agents, voice agents, support agents, sales & marketing agents, research & data agents, agent frameworks, agent platforms, agent tools & infrastructure, and agencies & build partners. Each agent record lists pricing, API availability, open-source status, and other verifiable facts with sources. The index also features search, sorting, head-to-head comparisons, and collections.

What makes The Agents Index stand out?

• Verified facts with sources — each listing carries the source each fact was verified from and the verification date; every agent is re-researched on a schedule with changes logged in a changelog.
• Broad coverage — 95 agents tracked, with 78 of 88 confirmed to expose a public API, 50 free to start, and 35 shipping source code you can read.
• Comparison tools — 34 head-to-head pages (e.g., Juggler vs Zot, Sierra vs Intercom Fin, LiveKit Agents vs PolyAI) and 16 collections such as MCP support, multi-agent support, free tier, usage-based pricing, self-hostable tools, and enterprise security controls.
• Category taxonomy — 9 agent categories, each with its own list, best-of ranking page, and buying guide (e.g., "How to Choose an AI Coding Agent: 25 Tools, 4 Jobs").
• Data-driven research — regular reports on the agent market, including entry pricing (median $20 across 41 published prices), API census, free tier counts, and model lock-in analysis.
• Editorial independence — rankings and verdicts are editorial; the quality gate is never for sale. Paid placements are clearly labelled as featured or sponsored.
• Free submission — agent makers can submit and claim listings for free, with the same quality gate applied to every entry.

Who should use The Agents Index?

• Developers evaluating coding agents or frameworks: compare tools like Junie (free for JetBrains users), Muse Code (usage-based, no training on your code), and Agno (Apache 2.0 Python SDK) on pricing, API access, and open-source status.
• Technical buyers selecting voice agents or agent platforms: check whether a product like Deepgram Voice Agent API offers self-hosted/VPC deployment or whether Webhound returns a sourced Dataset via MCP.
• Product managers researching the agent landscape: use the category pages, head-to-heads, and data reports to understand pricing, API adoption, and model lock-in across the market.
• Agent makers seeking visibility: submit a free listing, pass the quality gate, and manage the listing from a dashboard to keep facts fresh.

What can you do with The Agents Index?

• Find the best coding agent for your stack: filter the 25 coding agents by IDE support, pricing model, and API availability, then read head-to-heads like Juggler vs Zot.
• Assess voice agent APIs for production: use the voice agents category (12 tools) to compare WebRTC/SIP support, billing (e.g., OpenAI Realtime API billed purely on audio tokens), and self-hostability.
• Identify self-hostable agent infrastructure: open the "You Can Self-Host" collection to find tools like Goose (free, self-hosted, MCP-extensible) or AgentsKit (copy owned, typed source).
• Budget an agent build: rely on the "AI Agent Pricing in 2026" guide and the entry-price census, which found 41 of 93 agents publish an entry price with a median of $20.

How does The Agents Index work?

A research process builds each listing from primary sources. Submissions must pass an automated quality gate that requires a minimum of structured fields, sourced facts, and an on-topic fit-check. Each fact is tagged with its source, and listings are re-verified on a published cadence. The index is browsable via search, category filters, sorting by newest or recently verified, and dedicated comparison pages.

Pricing

The Agents Index is free to browse, search and submit to, and a listing stays free forever. One optional one-time upgrade of $29 makes a listing's outbound link permanently do-follow, and that same do-follow can be earned for free instead by putting The Agents Index badge on your own site. Monthly placement (Featured, Premium) and clearly-labelled sponsor slots are also sold; none of them change the research, the verdict or the cons.

FAQ

Is The Agents Index free?

Yes. Browsing and searching the directory is free, and submitting an agent is free. Every submission is researched and quality-gated the same way.

Can an agent pay for a better rank?

No. Rankings and verdicts are editorial, and the quality gate is never for sale. Makers can buy clearly-labelled placements (Featured spots and sponsorships), which never change what the research says about them.

How fresh is the data?

Every listing is re-researched on a schedule. Each fact carries the source it was verified from and the verification date, and changes are recorded in the listing changelog rather than happening silently.

Do you rate or score agents?

No. The index deliberately avoids numerical ratings. Instead, each listing shows the sources it is built from, names who it is best for and who it is not for, and lists real limitations. Any number would only measure how much research was found, not how good the agent is.

How do agents get listed?

A research agent builds a sourced listing, the quality gate checks it, and if it fits the taxonomy it publishes. The maker can then claim the listing from their inbox and manage it from a dashboard.