Should I vibe code
Collaborative flowcharts, system diagrams, and visual documentation
Boxes and arrows is an afternoon. Arrows that stay attached when you move the box is a career.
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Their verdict, the Individual price and the build-time estimate come from their entry, MIT-licensed. Checked 2026-08-04.
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Our verdict, the regret score and everything below it. Editorial and unsponsored — nobody can pay to be moved.
The honest answer
why the verdict is what it is
A canvas with draggable boxes is a weekend, and the screenshot will be convincing. Then you move a box. Connectors that stay attached and route orthogonally around three other shapes, grouping and multi-select that behave under rotation, undo that survives a second cursor, snapping that feels right rather than merely correct, and a PDF export that matches what is on screen — that is the actual product, and each one is a fortnight you did not plan for. Nothing here is dangerous. The risk is that you spend three months building a worse Excalidraw and end up with your architecture documentation in a format only your app can read.
What actually breaks
not "if". the specific failures.
- Connector routing. Attaching a line to a shape takes an hour; keeping it attached, orthogonal and out of the way of everything else while the shape moves is what Lucid has spent a decade on
- Undo, the moment there are two cursors. Collaborative editing needs a real CRDT or OT layer, and last-write-wins means one of you watches their work vanish mid-sentence
- Autosave. A canvas app that loses a two-hour diagram to a refresh is a canvas app nobody opens a third time
- Export fidelity — fonts, arrowheads and text wrapping that look right in the browser and wrong in the PDF the client actually receives
- Your file format, which is a JSON blob whose meaning lives inside your renderer, for documents that will outlive the tool by years
- The import nobody mentions in the plan: the .vsdx a colleague sends, or the Lucidchart link the rest of the team is still using
Is that you?
the verdict is a default, not a law
- The diagrams are yours, mostly explanatory, and losing one costs an afternoon
- You need one specific thing no general canvas does — rendering infrastructure from a config file, say — rather than a general-purpose editor
- Everything can also be expressed as Mermaid or Graphviz text, so the pictures survive the app that drew them
- Two people need to edit the same diagram at once
- The diagrams are documentation somebody will need to open in three years
- The only copy would live in your own undocumented format
- The audience opens them in Confluence, Visio, or a printed PDF
If you build it anyway
the checklist, then the prompt that enforces it
- Make the file format the deliverable: plain documented JSON, plus a generated text form (Mermaid or DOT) written from the same model on every save.
- Autosave to local storage on every change and to the server on a debounce, and restore on load. Do this before the second shape type.
- Version snapshots are cheaper than conflict resolution. Let people restore an older version rather than merging two.
- If you want multiplayer, adopt Yjs or Automerge. Do not invent a merge algorithm for a canvas.
- Get PNG, SVG and PDF export working early — export is where fidelity bugs hide, and they are much harder to fix after fifty features.
- Steal the interaction model, not the feature list. Lucidchart feels right because of snapping and hit targets, which is tuning rather than code.
I am building a diagramming canvas. It is not dangerous, it is bottomless, so constrain scope and protect my documents first. 1. Define the document model and its on-disk JSON format before any UI, and write it down in the README. This file has to be readable in five years by something other than my renderer. 2. Implement autosave to local storage on every mutation plus a debounced server save, and a recovery path on load, before adding a second shape type. Losing an hour of work is the failure mode that kills this project. 3. Add version snapshots and restore. Do not build merge or conflict resolution — if I ask for real-time collaboration, use Yjs or Automerge and tell me plainly that hand-rolled OT is a research project. 4. Export to SVG, PNG and PDF must work before the fifth feature, and every export gets a visual check against the canvas. Fidelity bugs found late are rewrites. 5. Generate a Mermaid or DOT representation from the same model on save, so my diagrams outlive this application. 6. Connectors attach to anchor points on shapes, never to coordinates. Routing is orthogonal with obstacle avoidance, and I want that solved before styling, themes or templates. 7. Undo is a command stack over the document model, not DOM state, and every feature you add must push onto it. Show me the test for undo after a multi-select drag. 8. Keep the renderer independent of the editor so a read-only viewer stays possible without shipping the whole toolbar. 9. Out of scope, and say so rather than half-building it: shape libraries at Lucid’s scale, .vsdx import, data-linked shapes, and presentation mode. If I need any of those, tell me to open Excalidraw or draw.io first.
That one keeps you out of trouble. For the prompt that actually builds it, canivibecodeit.com has one.
their build prompt ↗Or don’t build it
the boring option, and the way back out
Anyone else needs to open the file. Lucidchart is around $9 a month for an individual and buys shape libraries, Visio import, Confluence and Jira embedding, and diagrams your colleagues can edit without installing anything. If the real objection is the subscription rather than the tool, Excalidraw and draw.io are free, open source, and better than what you would finish.
$9/mo is cheaper than your weekend.
Export every diagram to SVG on a schedule and keep the JSON beside it, plus the generated Mermaid or DOT text. SVG opens anywhere forever, the text form survives a redesign of your own model, and between them you can rebuild in Lucidchart, draw.io or Excalidraw without redrawing anything by hand. The failure case is a database of shapes with no exporter, which is why the exporter is guardrail number four.
Open-source canvas with the interaction model everyone tries to copy, plus a documented file format.
Client-side diagram editor with Visio import and export fidelity nobody rebuilds by hand.
Infinite-canvas SDK if what you actually want is a canvas inside your own product.
Questions
Why demo-only rather than ship-it, if nothing here is dangerous?
Because you will not finish. The gap between a canvas that demos well and one you would choose over Excalidraw is measured in months of geometry and interaction tuning, and the entry is about whether to rely on it, not whether it is safe.
What is the one thing worth building myself?
A generator. Diagrams rendered from a file you already have — infrastructure from Terraform state, a schema from a migration, a sequence from a log — are genuinely better homemade, because the value is the mapping and not the editor.
Is real-time collaboration really that hard?
The transport is not; the semantics are. Two people dragging shapes in the same group, one of them undoing, is exactly the case naive implementations get wrong, and the symptom is silently destroyed work rather than an error. Use an existing CRDT and spend the time on hit targets instead.
Every week, someone ships something they shouldn’t have.
New verdicts, the worst thing that landed in the trap, and the occasional incident report. No other email, ever.
Fourteen people in a live workshop is not a feature called multiplayer. It is a distributed system with an audience.
A whiteboard whose shapes carry fields is a database with a canvas on top. That is two products, not one.
The canvas is a weekend. A .pptx that opens correctly on someone else's Windows machine is a career.
last reviewed 2026-08-04 · verdict is editorial and unsponsored · shared entry data from canivibecodeit under MIT · not legal advice