System design templates
For sketching services, data stores and the requests that pass between them. Each one opens as a new Drawdy board, free, with every element on it yours to edit.
English · 50 elements
System architecture
Clients, edge, services, data and external services, joined by arrows.
English · 38 elements
Sequence diagram
Four participants with lifelines, request arrows and dashed replies, plus notes.
English · 38 elements
C4 system context
Level 1 of the C4 model: your system, the people who use it and the systems around it, with a key.
English · 47 elements
C4 container diagram
Level 2 of the C4 model: the apps, services and databases inside one system, with a key.
English · 48 elements
C4 component diagram
Level 3 of the C4 model: the components inside one container and what they call, with a key.
English · 86 elements
Entity relationship diagram
Five tables with key and column cells, joined by relationship lines, plus a notation key.
English · 42 elements
Data flow diagram
External entities, processes and a data store joined by data flows, inside a trust boundary.
English · 83 elements
Threat model (STRIDE)
Sketch the system, list assets and entry points, then walk the six STRIDE threats to mitigations.
English · 41 elements
State machine
States joined by transitions, from an initial dot to a final ring, with loops back and a key.
English · 50 elements
Cloud deployment diagram
A region with public and private subnets, a load balancer, servers, a database and a cache.
English · 72 elements
CI/CD pipeline
Six stages from commit to monitor, plus environments from dev to production with an approval gate.
English · 57 elements
Event storming
A sticky colour key and a timeline with rows for commands, domain events and policies.
English · 76 elements
Architecture decision record
Title, status and context, three options with pros and cons, then the decision and its consequences.
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