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Build Calimero Apps

A Calimero application is a sandboxed WASM module that defines a shared, replicated state machine — its data types and the methods that mutate them. You write it in Rust against the SDK; the cluster runs each call once on the app’s leader and replicates what it wrote.

Start here

Section titled “Start here”
  1. Quickstart — install a node, install an app, call a method (15 min).
  2. Build your first app — scaffold → state → methods → build → run, end to end.
  3. Pick a how-to guide for the task in front of you.
  4. Keep the Reference open as you go.

Get started

Section titled “Get started”
QuickstartZero to a running app in 15 minutes.
Build your first appThe full guided walkthrough.

How-to guides

Section titled “How-to guides”
All guidesTask-focused recipes.
Example appsAnnotated walkthroughs of real apps.
Testing your appTestApp on the real engine, and shared JSON scenarios.

Reference

Section titled “Reference”
SDK macrosThe app macros, with examples.
Tables & CollectionsTables, collections, pages, costs and limits.
The env APIThe caller, the org, time, ids, events, cross-app calls.
App interface (ABI)What the component declares and the node enforces.

Deep dives

Section titled “Deep dives”
Upgrades & stateWhat an upgrade keeps, and how to keep the state readable.
Access controlWho may call what, and write rules as data shapes.
Gotchas & sharp edgesThe non-obvious things that bite.