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Lucid (Lucidchart)

Lucid is the maker of Lucidchart, a dedicated diagramming tool for flowcharts, ER diagrams, and system architecture diagrams. Made by Lucid Software, it's a freemium product ranking around #14 among documentation tools at roughly 5.3% usage share. Teams choose it over a general whiteboard when they need structured diagram types with a large shape/template library and rules that keep connectors, swimlanes, and entity relationships properly aligned rather than free-hand sketches.

Quick facts
Type: Dedicated diagramming tool (flowcharts, ER diagrams, system architecture)
Made by: Lucid Software
Cost: Freemium — free tier for basic diagrams, paid tiers for teams/enterprise
Best for: Structured technical diagrams that need a large shape library and precise layout rules
Primary use case: System architecture diagrams, ER diagrams, and flowcharts documented alongside engineering specs
Jump to: ExampleGetting startedBest for

Example

Lucidchart's REST API lets you generate documents programmatically, useful for auto-generating an architecture diagram from a deploy pipeline or infra-as-code definition.

# create a new Lucidchart document via the REST API
curl -X POST https://api.lucid.co/documents \
  -H "Authorization: Bearer $LUCID_ACCESS_TOKEN" \
  -H "Lucid-Api-Version: 1" \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Payments Service Architecture",
    "product": "lucidchart"
  }'

# export an existing diagram as a PNG for embedding in docs
curl https://api.lucid.co/documents/{document_id}?exportType=png \
  -H "Authorization: Bearer $LUCID_ACCESS_TOKEN" \
  -H "Lucid-Api-Version: 1" -o architecture.png

Getting started

Sign up free, start from a shape library (flowchart, ER diagram, AWS/Azure architecture icons), and drag connectors between shapes — or import an existing diagram from Visio.

# 1. Sign up free at lucid.co
# 2. New document → pick a template (Flowchart, ERD, Cloud Architecture)
# 3. Drag shapes from the library on the left, connect with snap-to lines
Best for: Teams documenting precise, structured technical diagrams — system architecture, database schemas, network topology — where consistent shapes and connector rules matter more than free-form sketching.