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* v0.6.29: login improvements, posthog telemetry (#4026) * feat(posthog): Add tracking on mothership abort (#4023) Co-authored-by: Theodore Li <theo@sim.ai> * fix(login): fix captcha headers for manual login (#4025) * fix(signup): fix turnstile key loading * fix(login): fix captcha header passing * Catch user already exists, remove login form captcha * fix: use context variables for block outputs in function block code When a function block references another block's output via <BlockA.result>, the executor previously embedded the full value as a JavaScript literal directly in the code string. For large outputs (>50 KB), this caused the code string to exceed the terminal console display limit, making inputs appear truncated or replaced with { __simTruncated: true } in the UI. Instead, block output references in function block code are now stored as named global variables (__blockRef_N) in the isolated VM context. The code string only contains the compact variable name, keeping it small regardless of the referenced value size. Loop/parallel/env/workflow references are still inlined as literals since the API route has no way to resolve them independently. The _runtimeContextVars key is filtered from sanitizeInputsForLog so it does not appear in execution logs or SSE events. Pre-resolved context variables are merged with any variables produced by the API route resolveCodeVariables, with executor values taking precedence. Fixes #4195 * fix: address Cursor and Greptile bot review comments - Pass preResolvedContextVariables through to shellEnvs for Shell language (Cursor: shell loses pre-resolved block refs, executes against undefined vars) - Remove duplicate CodeExecutionOutput interface declaration (Cursor + Greptile: dead duplicate declaration in tools/function/types.ts) - Deduplicate identical block references in resolveCodeWithContextVars so the same <BlockA.result> reused multiple times shares one __blockRef_N slot (Greptile P2: avoid duplicating large payloads across the wire) * fix: shell block references and complex env value serialization Two follow-ups to the function-block context-variable refactor: - resolveCodeWithContextVars now emits `$__blockRef_N` for shell function blocks so the script dereferences the env var injected by the executor. Other languages still receive the bare identifier. - The function-execute route now JSON-stringifies non-primitive values when building shell env vars, replacing the previous `String(v)` call that produced `[object Object]` for objects/arrays. Co-Authored-By: Octopus <liyuan851277048@icloud.com> * fix lint * review pass * ignore shell comments * update contract * fix tests --------- Co-authored-by: Waleed <walif6@gmail.com> Co-authored-by: Theodore Li <theodoreqili@gmail.com> Co-authored-by: Siddharth Ganesan <33737564+Sg312@users.noreply.github.com> Co-authored-by: Vikhyath Mondreti <vikhyathvikku@gmail.com> Co-authored-by: octo-patch <octo-patch@github.com> Co-authored-by: Vikhyath Mondreti <vikhyath@simstudio.ai>
The open-source platform to build AI agents and run your agentic workforce. Connect 1,000+ integrations and LLMs to orchestrate agentic workflows.
Build Workflows with Ease
Design agent workflows visually on a canvas—connect agents, tools, and blocks, then run them instantly.
Supercharge with Copilot
Leverage Copilot to generate nodes, fix errors, and iterate on flows directly from natural language.
Integrate Vector Databases
Upload documents to a vector store and let agents answer questions grounded in your specific content.
Quickstart
Cloud-hosted: sim.ai
Self-hosted: NPM Package
npx simstudio
Note
Docker must be installed and running on your machine.
Options
| Flag | Description |
|---|---|
-p, --port <port> |
Port to run Sim on (default 3000) |
--no-pull |
Skip pulling latest Docker images |
Self-hosted: Docker Compose
git clone https://github.com/simstudioai/sim.git && cd sim
docker compose -f docker-compose.prod.yml up -d
Sim also supports local models via Ollama and vLLM — see the Docker self-hosting docs for setup details.
Self-hosted: Manual Setup
Requirements: Bun, Node.js v20+, PostgreSQL 12+ with pgvector
- Clone and install:
git clone https://github.com/simstudioai/sim.git
cd sim
bun install
bun run prepare # Set up pre-commit hooks
- Set up PostgreSQL with pgvector:
docker run --name simstudio-db -e POSTGRES_PASSWORD=your_password -e POSTGRES_DB=simstudio -p 5432:5432 -d pgvector/pgvector:pg17
Or install manually via the pgvector guide.
- Configure environment:
cp apps/sim/.env.example apps/sim/.env
# Create your secrets
perl -i -pe "s/your_encryption_key/$(openssl rand -hex 32)/" apps/sim/.env
perl -i -pe "s/your_internal_api_secret/$(openssl rand -hex 32)/" apps/sim/.env
perl -i -pe "s/your_api_encryption_key/$(openssl rand -hex 32)/" apps/sim/.env
# DB configs for migration
cp packages/db/.env.example packages/db/.env
# Edit both .env files to set DATABASE_URL="postgresql://postgres:your_password@localhost:5432/simstudio"
- Run migrations:
cd packages/db && bun run db:migrate
- Start development servers:
bun run dev:full # Starts Next.js app and realtime socket server
Or run separately: bun run dev (Next.js) and cd apps/sim && bun run dev:sockets (realtime).
Copilot API Keys
Copilot is a Sim-managed service. To use Copilot on a self-hosted instance:
- Go to https://sim.ai → Settings → Copilot and generate a Copilot API key
- Set
COPILOT_API_KEYenvironment variable in your self-hosted apps/sim/.env file to that value
Environment Variables
See the environment variables reference for the full list, or apps/sim/.env.example for defaults.
Tech Stack
- Framework: Next.js (App Router)
- Runtime: Bun
- Database: PostgreSQL with Drizzle ORM
- Authentication: Better Auth
- Schema Validation: Zod
- UI: Shadcn, Tailwind CSS
- Streaming Markdown: Streamdown
- State Management: Zustand, TanStack Query
- Flow Editor: ReactFlow
- Docs: Fumadocs
- Monorepo: Turborepo
- Realtime: Socket.io
- Background Jobs: Trigger.dev
- Remote Code Execution: E2B
- Isolated Code Execution: isolated-vm
Contributing
We welcome contributions! Please see our Contributing Guide for details.
License
This project is licensed under the Apache License 2.0 - see the LICENSE file for details.
Made with ❤️ by the Sim Team