Tool
A
Retro Diffusion
Pixel-art diffusion models as an Aseprite extension (one-time) or hosted API.
⚠ Preliminary, based on public research, hands-on test pending. These scores come from a desk review of public sources (official pricing pages, docs, changelogs), linked on each tool page. Rex hasn't run the hands-on tests yet, so tiers shown are projected. Under our rubric, a tool's official tier is capped at B until it's tested.
What looks good
- One-time purchase option that runs locally: you own your pipeline
- Lives inside Aseprite, where many pixel artists already work
- Hosted API for animations and tilesets
Watch-outs
- Local extension needs a capable GPU (check requirements)
- Pixel art only
From public sources below, not from our own hands-on testing (yet).
Scores
Rank #2 · projected tier A · official tier B (untested cap) · ⚠ Preliminary
One-time $65 Aseprite extension that runs locally. Best ownership story for pixel artists.
Pricing as found Oct 15, 2026
| Plan | Price | Notes |
|---|---|---|
| Aseprite extension | $65 one-time | Local static generation, no credits |
| Lite extension | $20 one-time | |
| Web/API | Prepaid credits | ~$0.03 (Fast) to $0.18 (Pro) per image; 50 free credits for new accounts |
Prices in USD, excluding tax. Vendors change pricing often; check the official page before buying.
Sources
- Retro Diffusion on itch.io (astropulse.itch.io)
- Retro Diffusion Lite (astropulse.itch.io)
- Retro Diffusion API examples (github.com)
Accessed Oct 15, 2026. Spot an error? Request a correction.