generated: '2026-09-05'
method: searched
source: https://carvel.dev/ytt/
note: >-
  There is no sandbox in the payments sense — no test keys, no test mode, no fixtures, because
  there is no hosted service to run against. What Carvel does publish is a genuinely hosted
  try-before-install surface for ytt, plus a locally-servable copy of the same thing.
test_mode: null
test_credentials: null
test_values: null
surfaces:
  - name: ytt Playground
    kind: hosted-playground
    url: https://carvel.dev/ytt/#playground
    auth_required: false
    summary: >-
      In-page interactive editor on carvel.dev — edit template, data-values and overlay files and
      see the rendered YAML without installing anything. Reached from the "Try in Playground" call
      to action on https://carvel.dev/ytt/.
    examples_published: true
    examples_note: >-
      The playground ships worked examples (basics, data values, overlays, load, functions,
      libraries) that double as the ytt tutorial.
  - name: ytt website (self-hosted playground)
    kind: local-playground
    command: ytt website
    auth_required: false
    summary: Runs the same playground locally from the installed binary — the offline equivalent.
    docs: https://carvel.dev/ytt/docs/v0.52.x/
  - name: example applications
    kind: reference-workloads
    url: https://github.com/carvel-dev/simple-app-on-kubernetes
    summary: >-
      Runnable end-to-end examples (simple-app-on-kubernetes, guestbook-example-on-kubernetes,
      ytt-library-for-kubernetes-demo) that exercise the ytt / kbld / kapp pipeline against a real
      cluster. A local kind or minikube cluster is the de facto test environment.
  - name: kctrl dev deploy
    kind: local-reconcile
    command: kctrl dev deploy -f app.yml
    summary: >-
      Reconciles an App CR locally without a cluster-side kapp-controller — the supported way to
      rehearse a package before installing it.
    docs: https://carvel.dev/kapp-controller/docs/v0.57.x/
dry_run:
  supported: true
  command: kapp deploy -a <app> -f <config> --diff-run
  note: See conventions/carvel-conventions.yml dry_run_mode for the full flag set.