Side-by-side comparison of two listed Games — real listing data only, no paid placement.
On record, they differ in: pricing (ct.js Free vs Flax Engine Freemium); platforms (ct.js 1 official install link found vs Flax Engine 2 — store/installer links only); unique tags (ct.js 3: #2d #javascript #open-source vs Flax Engine 2: #3d #gamedev); category rank (ct.js #23 vs Flax Engine #27). Same category (Games). Listing facts only — not a recommendation.
Free 2D game engine based on web technologies with visual tools
ct.js is a free 2D game engine built on web technologies that aims to make learning programming fun and game development easy. It combines visual tools, documentation and a flexible modular library, with several coding language options and localized versions.
Published 2026-08-13 · Links checked 2026-09-06
Fully featured game engine with full source code access
Flax Engine is a game engine positioned as slim and agile, offering full source code and a fully featured toolset. It focuses on development performance to help teams iterate on games faster, with documentation, roadmap and community channels.
Published 2026-08-13 · Links checked 2026-09-06
| ct.js | Flax Engine | |
|---|---|---|
| Pricing | Free | Freemium |
| Category | Games | Games |
| Rank in Games | Position #23 of 74 | Position #27 of 74 |
| Alternatives listed | 12 → | 12 → |
| Shared tags | #game-engine | |
| Unique tags | #2d #javascript #open-source | #3d #gamedev |
| Platforms | Windows | macOS · Windows |
| Source code | github.com/ct-js/ct-js | github.com/FlaxEngine/FlaxEngine |
| Documentation | docs.ctjs.rocks/ | docs.flaxengine.com/ |
| Company | Not detected on official site (checked 2026-09-20) | Flax |
| In their own words | — | Best development performance out there Unleash your creativity and be more productive. With Flax you can boost your game development and bring it to another…— official site (homepage description), checked |
| Official channels | X (Twitter)declared on ctjs.rocks via homepage link with a matching handle | X (Twitter)LinkedInGitHubYouTubeInstagramFacebookdeclared on flaxengine.com via schema.org sameAs / homepage link with a matching handle |
| Official website | ctjs.rocks | flaxengine.com |
| Site preview | ||
Rank = neutral rotation by listing ID, not a quality score · how it works
Only platforms with an official store or installer link are listed; others may exist.
ct.js is Free; Flax Engine is Freemium. Both are listed in Games on ToolDock.
What they have in common: #game-engine
ct.js is listed as free; Flax Engine is listed as freemium (free tier alongside paid plans). Pricing label set at listing time; official pricing page linked where verified — see each official website for current details.
Both are Games listed on ToolDock, and they share the tag game-engine.
ToolDock keeps a tag-matched alternatives list for each: see ct.js alternatives and Flax Engine alternatives.