Flutter Motion Kit v3.32.0
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// verifier
All 12 entries passing
verified on Flutter 3.32 · re-verified monthly

Every animation runs the same four checks on every commit.

No vibes. The verifier formats, analyzes, builds for web, and leak-tests each main.dart against a pinned Flutter SDK. Anything red gets pulled from the catalog until it's fixed.

Entries passing
12 / 12
Actionable checks green
37 / 37
11 n/a (leak test not applicable)
Last verification run
Flutter 3.32 / 2026-06
cron: 1st of each month

Per-entry status

hover any check for the exact command
Animation
Format
Analyze
Build web
Leak test
SDK
Verified
Swipe to dismiss
explicit · diff 2/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Expand / collapse (AnimatedSize)
implicit · diff 2/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Hero shared-element transition
hero · diff 2/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Custom page transition (fade + slide-up)
explicit · diff 2/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
AnimatedList insert & remove
explicit · diff 3/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
3D card flip
explicit · diff 3/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Draggable bottom sheet
explicit · diff 3/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Shimmer skeleton loading
explicit · diff 3/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Collapsing SliverAppBar (parallax)
explicit · diff 3/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Staggered list entrance
staggered · diff 3/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
✓ pass flutter test --enable-leak-tracking
3.32
2026-06
CustomPainter progress ring
custom-painter · diff 4/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
Spring drag & release
physics · diff 4/5
✓ passdart format --set-exit-if-changed
✓ passflutter analyze (very_good_analysis)
✓ passflutter build web
n/a flutter test --enable-leak-tracking
3.32
2026-06
↗ View full run logs ↗ CI configuration (verify.yml)
// why this matters

Bad Dart compiles too.

A snippet that "looks right" can ship a leaking controller, a Hero tag collision, or a Paint allocated inside a 60fps callback. Linting won't catch any of those. The verifier does.

Our hierarchy of trust:

1 unsourced claim · "I heard it leaks"
2 sourced claim · link to a github issue or doc page
3 provable · a test that fails on the wrong version
4 machine-verified · CI runs the test, every month, on a pinned stable SDK
counter-example · bad.dart
⨯ fails leakTest 
// Every entry ships a bad.dart that fails the same checks.
// Proof the pitfall is real, not theoretical.

class _RotatingState extends State<Rotating>
    with SingleTickerProviderStateMixin {

  late final AnimationController ctrl
      = AnimationController(
          vsync: this,
          duration: Duration(seconds: 1),
        )..repeat();

  // ⨯ forgot dispose() — Ticker leaks on rebuild

  @override
  Widget build(BuildContext ctx) =>
      RotationTransition(turns: ctrl, child: ...);
}
flutter test --enable-leak-tracking catches this and refuses to publish the entry until main.dart calls ctrl.dispose().
▸ Verification status (JSON) — machine-readable, for agents 
{
  "verifiedOn": "Flutter 3.32 / 2026-06",
  "reVerified": "monthly (1st, via CI cron)",
  "totalEntries": 12,
  "passing": 12,
  "checks": [
    "format",
    "analyze",
    "buildWeb",
    "leakTest"
  ],
  "entries": [
    {
      "id": "dismissible-swipe",
      "category": "explicit",
      "difficulty": 2,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "expand-collapse-size",
      "category": "implicit",
      "difficulty": 2,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "hero-shared-element",
      "category": "hero",
      "difficulty": 2,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "page-route-transition",
      "category": "explicit",
      "difficulty": 2,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "animated-list-insert-remove",
      "category": "explicit",
      "difficulty": 3,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "card-flip-3d",
      "category": "explicit",
      "difficulty": 3,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "draggable-bottom-sheet",
      "category": "explicit",
      "difficulty": 3,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "shimmer-skeleton",
      "category": "explicit",
      "difficulty": 3,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "sliver-collapsing-appbar",
      "category": "explicit",
      "difficulty": 3,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "staggered-list-entrance",
      "category": "staggered",
      "difficulty": 3,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "pass"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "custom-painter-progress-ring",
      "category": "custom-painter",
      "difficulty": 4,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    },
    {
      "id": "spring-physics-drag",
      "category": "physics",
      "difficulty": 4,
      "checks": {
        "format": "pass",
        "analyze": "pass",
        "buildWeb": "pass",
        "leakTest": "n/a"
      },
      "verifiedOn": "Flutter 3.32 / 2026-06"
    }
  ]
}
Catalog endpoint: /api/animations.json Crawler index: /llms.txt