2D Game Art Tool Ecosystem

Quick refs: aseprite-shortcuts.md, ldtk-vs-tiled.md, aseprite-lua-scripting.md

Aseprite (the standard)

Pixel-art DCC. Buy once $20 / FOSS source available (compile yourself for free, but the binary is paid). De-facto industry standard for indie pixel art. Used by Stardew Valley, Celeste, Hyper Light Drifter, hundreds more.

Key features:

• Layers + groups with blend modes.
• Animation (timeline, onion skin, tags, per-frame duration).
• Tilemap mode (since v1.3) — author tilesets natively.
• Slice tool for sub-region metadata (collision, hitboxes).
• Symmetry (X/Y mirror painting).
• Indexed mode for palette swaps.
• Lua scripting (extensive API for batch operations, custom tools).
• Aseprite Importer for Unity (native, Unity Asset Store / OpenUPM).
• Export: PNG, GIF, sprite sheet + JSON sidecar.

Companion: Pixelorama = FOSS alternative (GDScript-based, Godot project). Less polished, less docs, but free.

Tiled (level editor, generic)

Free + open-source. Multi-platform. Mature. Most engines have an importer.

• Tilesets: import from PNG, define tile properties.
• Tile layers + object layers (collision, spawn points).
• Wang sets built-in (autotile).
• Custom properties per tile, per object, per layer.
• Export: TMX (XML), JSON. Engine importers everywhere.

Strengths: stable, scriptable (Python), well-documented, supports hexagonal + isometric out of box. Weaker auto-tiling than LDtk.

LDtk (Level Designer Toolkit)

By Sébastien Bénard (creator of Dead Cells). Newer than Tiled, gaining ground rapidly in indie scene.

• IntGrid layers: design with abstract values (1=wall, 2=floor), rules paint sprites on top — separates gameplay logic from visual representation.
• Auto-Layer rules: pattern-match IntGrid → place tiles. Most powerful autotile system available.
• Levels in a world (multi-level layout).
• Entities with custom fields (gameplay objects).
• Exports: JSON (rich), GodotImporter, LDtk Unity importer (well-maintained), Phaser, Heaps, custom.

Strengths: rule-based autotile, multi-level worlds, gameplay-friendly IntGrid abstraction.

Weaknesses: less scriptable than Tiled (no Python plugin), newer = less community content.

See quick-ref/ldtk-vs-tiled.md for the detailed comparison.

Tilesetter (autotile generator)

Specialized: generates autotile patterns from a few base tiles. ~$10. Output: PNG tileset + JSON metadata.

• Provide 4-7 base tiles (interior, edge, corner).
• Tilesetter generates blob (256-tile / 47-tile) automatically.
• Export to engine.

Use case: don't want to hand-paint 47 transition tiles.

Pixel-art alternatives

Skeletal 2D animation

For high-frame-count animation that would be impractical frame-by-frame (complex characters with 200+ frame animations across many states).

Spine

• Industry standard ($69-299).
• Skeletal rigging: bones, IK, mesh deformation, free-form deformation.
• Runtimes for Unity, Unreal, Godot, Cocos2d, libGDX, etc.
• Used by: Hollow Knight, Dragon Age 2D portraits.

DragonBones

• FOSS alternative.
• Similar feature set, runtimes for Unity, Cocos2d-x, Phaser, etc.
• Less polished than Spine.

Unity 2D Animation Package

• Built-in to Unity.
• Bone-rigging via Sprite Editor.
• Less features than Spine, but free + integrated.

When to use skeletal vs frame-by-frame:

• Skeletal: 100+ frames per character, 10+ animations, characters with many parts.
• Frame-by-frame: pixel art, ≤20 frames per animation, distinctive silhouettes per frame.

Normal map authoring

Sprite Lamp

$15. Lighting-pass based: provide 3-4 directional renderings, get normal map. Quality:high. Used by: Owlboy, Dust: An Elysian Tail.

Sprite DLight

$15. Procedural: just provide diffuse, get a heuristic normal map. Quality: medium. Fast workflow.

Materialize

Free. Cross-platform. Generates normal + height + AO. Less specialized for pixel art but versatile.

Manual painting in Photoshop / Krita

Highest quality, slowest. Paint each pixel directly in normal-map color space.

TexturePacker

Standard atlas generator. ~$40 (free for personal projects with limitations).

• Pack many sprites into atlases.
• Trim transparent borders.
• Auto-extrude (anti-bleeding padding).
• Output: JSON / XML / Unity / Godot / Phaser-specific formats.

In Unity: typically use the built-in Sprite Atlas instead. In raw / browser engines: TexturePacker is essential.

Engine import pipelines

Unity

• Aseprite Importer (Unity, com.unity.2d.aseprite): native .ase reading. Generates AnimationClips per Aseprite tag. Recommended.
• PSD Importer (com.unity.2d.psdimporter): Photoshop PSDs as multi-layer sprites. Good for character rigs.
• Sprite Atlas v2: pack sprites at build time.

Godot

• AsepriteWizard (community add-on): import .ase → AnimatedSprite2D
  • frames.
• TextureRegion editor built-in.

Phaser / web

• TexturePacker JSON output → Phaser Atlas loader.
• Aseprite JSON sidecar can be parsed manually.

Larger-resolution 2D tools

For non-pixel-art 2D (painterly, vector):

• Procreate (iPad, $13): mobile painting.
• Krita (FOSS): desktop painting, Linux/Mac/Win.
• Photoshop (subscription): industry standard for digital painting.
• Affinity Photo / Designer ($55 each, no subscription): Photoshop / Illustrator alternatives.
• Clip Studio Paint ($50): manga + animation focus.
• Figma: vector UI design.

For vector specifically (UI, scalable assets): Affinity Designer or Figma.

File format cheat sheet

AI-assisted generation

For AI-driven sprite / pixel-art / tileset generation (PixelLab, Scenario, Leonardo, Retro Diffusion, Stable Diffusion + LoRAs) see the dedicated ai-art-tools/SKILL.md. Short take: PixelLab is the purpose-built choice for pixel art with native sprite-sheet + animation output and an Aseprite plugin; Scenario wins for project-style-locked asset libraries; Stable Diffusion + a pixel-art LoRA is the free, fully-local route for technical artists.

See also

• ai-art-tools/SKILL.md — AI generators trade-offs
• tile-design/SKILL.md
• animation-frames/SKILL.md
• seamless-textures/SKILL.md
• Engine: unity-2d-core, unity-2d-animation, unity-2d-tilemap