you can build production AI agents with GPT-5.5, grok 4.20, AND kimi k2.6 - 500 runs/month for FREE 😳
no credit card, google login works.
stackai were acquired by asana last year and just opened up their free tier
what you get for $0:
- 500 agent runs per month (resets monthly)
- GPT-5.5, grok 4.20, kimi k2.6, claude, gemini, 30 model providers
- visual drag-and-drop workflow builder (no code needed)
- RAG from documents, web, google drive, notion
- multi-modal: vision, text-to-speech, speech-to-text
- logic nodes: python, javascript, code execution
- browser extension, slack bot, REST API access
- 2 projects, 1 seat
what sets it apart from other free agent builders:
- founded by MIT PhDs, backed by $16M series A
- acquired by asana - not a random startup
- 100 enterprise integrations (salesforce, sharepoint, snowflake)
- human-in-the-loop oversight
- SOC 2 / HIPAA / GDPR compliance even on free tier
- switch models per step in your workflow
how to get started (3 min):
> go to
stackai.com
> sign up with google - no credit card
> create a new project
> pick your model (GPT-5.5, grok, kimi, claude, whichever)
> build your agent with the drag-and-drop editor
> publish and use the chat UI or API endpoint
important:
- 500 runs/month limit - fine for testing and prototyping
- 2 projects cap - enough to experiment
- you can use temporary emails for multiple accounts to extend runs
- no production SLA, this is for building and learning
- runs reset monthly, not daily
visual agent builder 5 frontier models enterprise integrations = $0
while everyone else pays $20/mo for each model subscription
bookmark this before the free tier changes