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https://github.com/simstudioai/sim.git
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Theodore Li
af8025c411
* fix(table): cut dispatcher cold-start by lazy-loading heavy import chains The trigger.dev table-run-dispatcher spent ~6s in module init before its first batchTriggerAndWait — it imports lib/table/service for getTableById, which eagerly imported lib/table/trigger → @/lib/webhooks/processor → webhook-execution + executor, dragging the entire workflow-execution stack into the dispatcher container even though it never fires a trigger. - trigger.ts lazy-imports the webhook processor + polling utils inside fireTableTrigger (the only consumer), so importing service no longer pulls the executor. - buildEnqueueItems only imports the cell job (for the inline `runner`) on the database backend; the trigger.dev backend triggers by task id and ignores runner. * fix(table): run counter + gutter Stop update instantly on Run The "X running" badge, per-row gutter Stop button, and runningByRowId map stayed at zero after clicking Run until a manual refetch. useRunColumn optimistically stamped cells pending in the rows cache but never bumped the activeDispatches counter — so when the dispatcher's real pending SSE arrived, applyCell saw the cell was already in-flight (wasInFlight === isInFlight) and skipped the counter delta. The optimistic stamp ate the transition. - onMutate now bumps runningCellCount / runningByRowId by the cells it stamps, snapshotting prior run-state for rollback on error. - onSuccess seeds the dispatch into the overlay list from the response instead of invalidating activeDispatches (a refetch would reset the optimistic counter to the server's still-zero count before the dispatcher stamps). * fix(table): drive cell typewriter with rAF so concurrent reveals stay smooth The character-by-character reveal used a per-cell setInterval. When many cells reveal at once (a Run-all completing in waves), the independent interval callbacks fire at uncoordinated times and each forces its own render + layout/paint — O(cells) reflows over an un-virtualized grid, so it degrades as more cells fill. Switch to requestAnimationFrame: all cells' callbacks run before one paint, so React batches them into a single render + paint per frame regardless of cell count. Reveal length is derived from elapsed time, so a dropped frame catches up instead of slowing the animation. * fix(table): roll back optimistic run counter when no dispatch is created useRunColumn.onSuccess returned early on a null dispatchId (no matching groups / eligible rows) without undoing the onMutate counter bump — and no SSE would arrive to correct it, leaving the counter permanently inflated. Restore the pre-mutation run-state on that path, mirroring onError. * chore(table): tighten inline comments on dispatcher cold-start fixes
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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