BuildingAI (FastbuildAI) records 0 monthly visits with -100% month-over-month growth and Free pricing. Sim AI records 140,953 monthly visits with +20.6% growth and Freemium, Paid (per user/month), and Enterprise with custom pricing; self-hosting free under Apache 2.0 pricing.
Open-source, block-based platform for building and monetizing your own private AI app suite
Open-source workspace to build, deploy and govern AI agents
| Dimension / Metric | | |
|---|---|---|
| Official Domain | fastbuildai.com | sim.ai |
| Pricing Model | Free | Freemium, Paid (per user/month), and Enterprise with custom pricing; self-hosting free under Apache 2.0 |
| Monthly Visits | 0 (0) | 140.95K (140,953) |
| MoM Traffic Delta | -43 (-100%) | +24.09K (+20.6%) |
| Primary Market & Share | 🇯🇵 Japan (100%) | 🇮🇳 India (26.1%) |
| Direct Visits / mo | 0 | 73.83K |
| User Rating | 4.6 | 4.6 |
| Supported Platforms | Website | Website |
Open-source, block-based platform for building and monetizing your own private AI app suite
Core AI capabilities are decomposed into modules with a plugin layer for custom functionality, so you compose systems by assembling components such as knowledge base, agent or workflow rather than coding from zero.
Build agents on a drag-and-drop canvas, attach knowledge bases, import/export agents via DSL, and interoperate with Coze, Dify and MCP-based tools.
Create structured, extensible knowledge stores, import multiple document formats, and share editing/management rights with collaborators through role-based permissions.
Connect mainstream global large language models and AIGC image models, or run fully local inference through Ollama, with unified key management.
Open-source workspace to build, deploy and govern AI agents
Create agents by describing them in Chat, arranging blocks on a visual canvas, or writing code and CLI commands, and deploy the result without rebuilding it.
Sync and auto-update documents from Notion, Google Drive, Confluence, Slack, GitHub and SharePoint so agents ground answers in current company knowledge.
Agents read and write structured data in Sim Tables and keep files and artifacts organized in one shared store across runs.
Trace every agent run block by block with success rate, latency, execution cost and failure details for debugging and reporting.
Autonomous enterprise AI agents and CRM intelligence powered by Salesforce Data 360 and Atlas.
Autonomous enterprise AI agents and CRM intelligence powered by Salesforce Data 360 and Atlas.
Build working apps, websites, and AI agents by describing them
Build working apps, websites, and AI agents by describing them
Free / Open-sourceRun and build with open AI models locally or in the cloud
Free / Open-sourceRun and build with open AI models locally or in the cloud
SpecialistAutomate work across thousands of apps — no code required
Free / Open-sourceProvides vastly superior general workflow automation and node variety, but with slightly less specialized native LLM evaluation tooling.
Free / Open-sourceProvides vastly superior general workflow automation and node variety, but with slightly less specialized native LLM evaluation tooling.
Offers an intuitive no-code builder for custom agents, but is a commercial platform without Sim AI's open-source flexibility.
Offers an intuitive no-code builder for custom agents, but is a commercial platform without Sim AI's open-source flexibility.
Free / Open-sourceOffers a more polished visual canvas for RAG pipelines and LLM apps, but requires more setup for external API integrations.
Free / Open-sourceOffers a more polished visual canvas for RAG pipelines and LLM apps, but requires more setup for external API integrations.
Free / Open-sourceSelf-hosted AI workspace for local and cloud models
Free / Open-sourceSelf-hosted AI workspace for local and cloud models
Free / Open-sourceOpen-source no-code database, app builder and automation platform
Free / Open-sourceOpen-source no-code database, app builder and automation platform
Provides enterprise-grade security and robust incident response workflows, but lacks native visual RAG knowledge base management.
Provides enterprise-grade security and robust incident response workflows, but lacks native visual RAG knowledge base management.
Free / Open-sourceFeatures a cleaner, more lightweight visual builder with conversational prompting, but has a smaller ecosystem of prebuilt AI components.
Free / Open-sourceFeatures a cleaner, more lightweight visual builder with conversational prompting, but has a smaller ecosystem of prebuilt AI components.
Excels at building multi-agent workforces for business tasks, but lacks Sim AI's deep focus on open-source code-first flexibility.
Excels at building multi-agent workforces for business tasks, but lacks Sim AI's deep focus on open-source code-first flexibility.
