# Which Lottie / After Effects features do rlottie, ThorVG, Skottie and lottie-web document or log as unsupported?

- id: art_01M5MDYKWVQFST270ZSRW44HN6
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T07, T17 · tags: none
- updated: 2026-10-23T13:07:07.796Z
- url: https://veyrul.com/articles/art_01M5MDYKWVQFST270ZSRW44HN6

Lottie playback depends on the renderer: rlottie's README marks skew, several mask modes, all merge-path modes, layer effects, all text features and expressions as unsupported and says the project gets no security support; ThorVG logs merge paths and twist as unsupported, 3D transforms as not fully compatible and some font types and layer effects as unsupported; Skottie warns on unsupported mask modes and ignores the legacy track-matte flag for Lottie >= 1.0. The lottie-web README has no support matrix (producer negative result, not re-read).

Lottie playback depends on the renderer: rlottie's README marks skew, several mask modes, all merge-path modes, layer effects, all text features and expressions as unsupported and says the project gets no security support; ThorVG logs merge paths and twist as unsupported, 3D transforms as not fully compatible and some font types and layer effects as unsupported; Skottie warns on unsupported mask modes and ignores the legacy track-matte flag for Lottie >= 1.0. The lottie-web README has no support matrix (producer negative result, not re-read).

Curator qualifications: Specs and code read 2026-10-22; no file round-tripped or rendered. ThorVG expression coverage not read (producer conflict note kept). Log strings show unsupported paths; full feature coverage is not established by them.

Limitations: Specs and code read 2026-10-22; no file round-tripped or rendered.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://github.com/Samsung/rlottie/blob/ea06d2f29ba01b8d06c00a838d107f5e484ae59b/README.md",
      "note": "rlottie README.md at ea06d2f2 (raw), L7-L8 and Supported After Effects Features table; thorvg src/loaders/lottie/tvgLottieParser.cpp at b6d6a687 (raw), L569, L912-913, L1086, L1547; skia modules/skottie/src/Layer.cpp at ca14cab7 (raw), L189, L546"
    },
    {
      "url": "https://github.com/thorvg/thorvg/blob/b6d6a687ec206ba109409ec98308559f0676cb52/src/loaders/lottie/tvgLottieParser.cpp",
      "note": "rlottie README.md at ea06d2f2 (raw), L7-L8 and Supported After Effects Features table; thorvg src/loaders/lottie/tvgLottieParser.cpp at b6d6a687 (raw), L569, L912-913, L1086, L1547; skia modules/skottie/src/Layer.cpp at ca14cab7 (raw), L189, L546"
    },
    {
      "url": "https://github.com/google/skia/blob/ca14cab77c861e85d12c4dccf256ea4713d76460/modules/skottie/src/Layer.cpp",
      "note": "rlottie README.md at ea06d2f2 (raw), L7-L8 and Supported After Effects Features table; thorvg src/loaders/lottie/tvgLottieParser.cpp at b6d6a687 (raw), L569, L912-913, L1086, L1547; skia modules/skottie/src/Layer.cpp at ca14cab7 (raw), L189, L546"
    },
    {
      "url": "https://github.com/airbnb/lottie-web/blob/bede03d25d232826e0c9dca1733d542d8a7754fb/README.md",
      "note": "rlottie README.md at ea06d2f2 (raw), L7-L8 and Supported After Effects Features table; thorvg src/loaders/lottie/tvgLottieParser.cpp at b6d6a687 (raw), L569, L912-913, L1086, L1547; skia modules/skottie/src/Layer.cpp at ca14cab7 (raw), L189, L546"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Lottie playback depends on the renderer: rlottie's README marks skew, several mask modes, all merge-path modes, layer effects, all text features and expressions as unsupported and says the project gets no security support; ThorVG logs merge paths and twist as unsupported, 3D transforms as not fully compatible and some font types and layer effects as unsupported; Skottie warns on unsupported mask modes and ignores the legacy track-matte flag for Lottie >= 1.0. The lottie-web README has no support matrix (producer negative result, not re-read). · locator: rlottie README.md at ea06d2f2 (raw), L7-L8 and Supported After Effects Features table; thorvg src/loaders/lottie/tvgLottieParser.cpp at b6d6a687 (raw), L569, L912-913, L1086, L1547; skia modules/skottie/src/Layer.cpp at ca14cab7 (raw), L189, L546 · source: https://github.com/Samsung/rlottie/blob/ea06d2f29ba01b8d06c00a838d107f5e484ae59b/README.md

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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