* fix(rich-markdown-editor): stop drag/paste of an existing image from re-uploading a duplicate
Dragging an image block to reorder it, or copy-pasting an already-hosted image within the
editor, both re-uploaded the image as a brand-new file instead of reusing/moving the existing
one:
- Dragging an <img> to reorder it is a native HTML5 drag; browsers synthesize an image File
into event.dataTransfer for it (the same mechanism that lets you drag a web image to your
desktop), indistinguishable from a real external drop by dataTransfer contents alone. Our
handleDrop treated that File as a genuinely new image, uploaded it, and inserted a duplicate
node — while ProseMirror's own default move logic never got to run, so the original was left
behind too. Fixed by checking `view.dragging` (ProseMirror's own signal that a drop follows a
dragstart within this same view) and bailing out to let its default move logic run.
- The same browser behavior applies to copy-paste: selecting a rendered <img> already on the
page and pressing Cmd+C puts BOTH `text/html` (the real node, with its real hosted src) AND a
synthesized image File onto the clipboard. Our handlePaste preferred the File, re-uploading and
inserting a new node rather than cloning the original (silently dropping width/href/title in
the process). Fixed by preferring the HTML sibling — via the existing extractEmbeddedFileRef
helper — whenever it already names one of our own hosted files.
* fix(rich-markdown-editor): fix link color lost under bold/italic/strikethrough/code
strong/em/del/s/code each set their own explicit `color` for the plain (no-link) case. Nested
inside a link, that explicit rule on the mark itself always wins over the color inherited from
the ancestor <a> — an inherited value never beats an element's own explicit rule, regardless of
how specific the ancestor's selector is. So an italic (or bold/struck-through/inline-code) link
rendered in the mark's plain-text color instead of the link's blue.
Adds an explicit `.rich-markdown-prose a <mark>` / `.rich-markdown-prose <mark> a` override,
covering both DOM nesting orders since ProseMirror's mark order (and so which nests outside the
other) depends on which was toggled first, not a fixed schema order. Only `color` is touched —
each mark's own font-weight/font-style/text-decoration/background composes normally underneath.
24 new tests load the real, shipped CSS into jsdom and assert against getComputedStyle for every
mark x both nesting directions x multi-mark stacks, plus regression guards that a mark with no
link keeps its own color and a link elsewhere in the doc doesn't bleed color into unrelated text.
Verified all 11 color-assertion tests fail against the pre-fix CSS.
* fix(rich-markdown-editor): fix real-world gaps in the image dupe-upload fix
Found while re-verifying the drag/paste dupe-upload fix against the actual rendered DOM before
trusting it:
- hasHostedImageHtml's predicate only recognized the *persisted* src shape
(extractEmbeddedFileRef, e.g. /api/files/view/...). The DOM (and so a same-page copy's
clipboard html) always contains resolveImageSrc's REWRITTEN inline-route URL instead
(/api/workspaces/{id}/files/inline?key=.../?fileId=..., or the public-share equivalent) — a shape
the fix never recognized, so it silently never engaged for a real browser copy. Added
isInlineRouteSrc to also recognize it, verified end-to-end against the real resolveImageSrc
output (not a hand-typed guess).
- The img-src regex only matched quoted attribute values; an unquoted src (valid HTML) fell
through to the old re-upload path instead of being recognized as hosted.
- The paste bypass fired on ANY hosted image found in the html, even when the clipboard also
offered additional image files — a genuinely mixed paste (the hosted image plus a separate new
one) would have the new file silently dropped instead of uploaded. Narrowed to only bypass when
exactly one image file is offered.
- The drop bypass checked view.dragging unconditionally, including for the plain-file swallow
branch below it — a stale view.dragging (ProseMirror clears it up to ~50ms late via dragend when
a prior internal drag was dropped outside the view) could suppress swallowing an unrelated
non-image file drop (e.g. a PDF) in that window, letting it fall through to the browser default.
Gated on images.length > 0 so staleness can only ever affect the image-specific path it exists
for.
Extracted the paste/drop bypass decisions into shouldSkipPasteUpload/shouldSkipDropUpload so
they're unit-testable without mounting the full editor component.
* fix(rich-markdown-editor): fix the entire class of mark-color-vs-ambient-color bugs, not just links
Auditing every explicit `color` in this file for the same failure mode (an element's own explicit
color always wins over an inherited one, regardless of ancestor specificity) surfaced a second,
previously-unfixed instance: bold/italic text inside an h6 heading showed the brighter
--text-primary instead of h6's own intentionally dimmer --text-secondary, since strong/em hardcoded
--text-primary as their default.
strong/em's color was always redundant with the prose root's own default anyway — removing it
entirely (matching the highlight/`mark` rule's existing `color: inherit` convention in this same
file) lets normal CSS inheritance carry the correct color through from ANY ambient context, not
just links: a link's blue, h6's dimmer tone, or any future colored container this file doesn't
know about yet. `code` has the same redundant color, also removed.
del/s genuinely need their own dimmer default (distinct from the prose default), so they keep an
explicit color plus the link-color override — now the only mark that needs one, since strong/em/
code no longer set a competing color to override in the first place.
10 new tests cover every heading level x strong/em/code/del/s x link, including 2 that fail against
the pre-fix CSS (bold/italic and inline-code inside h6 both incorrectly showed --text-primary).
* fix(rich-markdown-editor): stop paste-clone from persisting the display-layer image URL
Cursor caught a real correctness bug in the paste/drop dupe-upload fix: bypassing to the editor's
DEFAULT html-based paste for an already-hosted image made it re-parse the clipboard html's <img
src>, which is resolveImageSrc's REWRITTEN *display* URL, not the real persisted one — baking that
display-only URL into the document. Public share, export, and referenced-by-doc tracking only
recognize the persisted shape, so the pasted image would silently vanish from all three.
Fixed by no longer letting default paste construct the node at all: findHostedImageAttrs walks the
CURRENT doc for an existing image node whose *resolved* src matches the clipboard html's, and
returns that node's real, persisted attrs (src, width, href, title — everything) to clone
ourselves. Falls through to a normal upload (always correct, just occasionally redundant) if no
match is found, rather than ever trusting the html's src directly.
Also merged the paste- and drop-specific skip checks into one shouldSkipFileUpload, and switched
the drop side off `view.dragging` entirely (Greptile: it can go briefly stale, up to ~50ms, when a
prior internal drag was dropped outside the view, which could suppress upload of an unrelated new
file dropped in that window) — now purely a function of what the current event's html/images
actually contain, which the drop's own default move logic (relocating the real node, never
re-parsing html) was never at risk from in the first place.
A workspace to build, deploy and manage AI agents and workflows.
Quickstart
Cloud-hosted: sim.ai
Self-hosted
npx simstudio
Docker must be installed and running. Use -p, --port <port> to run Sim on a different port, or --no-pull to skip pulling the latest Docker images.
Capabilities
- Connect 1,000+ integrations and every major LLM
- Add Slack, Notion, HubSpot, Salesforce, databases, and more
- Build agents visually, conversationally, or with code
- Ingest files, knowledge bases, and structured table data
- Monitor runs, logs, schedules, and workflow activity
One workspace, every surface
Chat and workflows are just the start — tables, files, knowledge, and scheduled tasks all live in the same workspace.
Tables — a database, built in |
Files — one store for your team and every agent |
Knowledge — your agents' memory |
Scheduled tasks — runs on your schedule |
Self-hosting
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.
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).
Chat API Keys
Chat is a Sim-managed service. To use Chat on a self-hosted instance:
- Go to https://sim.ai → Settings → Chat keys and generate a Chat 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
Next.js · Bun · PostgreSQL · Drizzle · Better Auth · Tailwind — and the rest of the 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.





