Independent, not tied to a CRM
Agent.ai was built by HubSpot's co-founder and its agent vision now lives inside HubSpot's CRM. Krater is a standalone AI workspace you can use without adopting a CRM.
The Agent.ai alternative that does more
Krater is the Agent.ai alternative that stays independent, with 350+ models and built-in Agents, not tied to a CRM.
Agent.ai comparison
Agent.ai is the AI agent marketplace built by HubSpot's co-founder, and in 2026 its agent vision moved into HubSpot's CRM. Krater is an independent AI workspace with 350+ models, a full creative suite and Agents you build yourself, on one subscription.
Krater pricing · AI model directory · AI image generator · Skywork alternative
| Category | Agent.ai | Krater |
|---|---|---|
| Independence | Built by HubSpot's co-founder, agent vision now inside HubSpot's CRM | Independent, not owned by a CRM company |
| What it is | Marketplace and network for single-task AI agents | Full AI workspace: chat, image, video, voice and docs |
| AI models | Model chosen per agent | 350+ models, switch anytime |
| Custom agents | Build and list agents in the marketplace | Build your own with Agents (formerly Personas) |
| Creative tools | Focused on agent tasks | Image, video, voice and music built in |
| Pricing | Free to use | Pro at $20/mo for 350+ models and every modality |
Highlights
Agents you build yourself
Krater has Agents (formerly Personas): give any of 350+ models a role, instructions and tools, then reuse them across chat, image, video and documents.
One workspace for every modality
Chat, image, video, voice, music and document workflows share one login, one subscription and one shared credit pool, instead of a directory of single-task agents.
Frequently asked questions
What is the best Agent.ai alternative?
Krater is a strong Agent.ai alternative for people who want an independent AI workspace with 350+ models, built-in Agents (formerly Personas) and a full creative suite, rather than a directory of single-task agents tied to a CRM.
Did HubSpot buy Agent.ai?
Agent.ai was created by Dharmesh Shah, HubSpot's co-founder and CTO. In 2026 HubSpot launched Agent Hub and moved its AI agent vision into its CRM, tightening Agent.ai's ties to the HubSpot ecosystem. Krater is independent and not owned by a CRM company.
Does Krater have AI agents?
Yes. Krater has Agents (formerly Personas): you give any of 350+ models a role, custom instructions and tools, then reuse them across chat and the creative suite. There is also a Krater Agent mode for multi-step tasks.
Is Agent.ai free?
Agent.ai is free to use its public agents. Krater is a paid workspace: Pro is $20 per month for 1,500 credits across 350+ models and every modality, positioned around breadth and workspace value rather than a free directory.