Side-by-side comparison of two listed Games — real listing data only, no paid placement.
On record, they differ in: platforms (surviv.io 1 official install link found vs ct.js 1 — store/installer links only); unique tags (surviv.io 3: #battle-royale #multiplayer #free-to-play vs ct.js 3: #game-engine #javascript #open-source); category rank (surviv.io #22 vs ct.js #23). Same pricing model (Free) and category (Games). Listing facts only — not a recommendation.
2D battle royale game
surviv.io is a 2D battle royale game where players compete to be the last one standing. It features solo, duo, and squad modes, with a variety of weapons, medical items, and adrenaline boosts. The game is free to play and supports multiple regions.
Published 2026-08-08 · Links checked 2026-09-18
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
| surviv.io | ct.js | |
|---|---|---|
| Pricing | Free | Free |
| Category | Games | Games |
| Rank in Games | Position #22 of 74 | Position #23 of 74 |
| Alternatives listed | 3 → | 12 → |
| Shared tags | #2d | |
| Unique tags | #battle-royale #multiplayer #free-to-play | #game-engine #javascript #open-source |
| Platforms | Web app (installable) | Windows |
| Source code | Not detected on official site (checked 2026-09-18) | github.com/ct-js/ct-js |
| Documentation | Not detected on official site (checked 2026-09-18) | docs.ctjs.rocks/ |
| In their own words | Like games such as Player Unknown's Battlegrounds (PUBG), Fortnite or Apex Legends? Play this free 2d battle royale io game in your browser!— official site (homepage description), checked | — |
| Official channels | X (Twitter)InstagramFacebookdeclared on surviv.io via homepage link with a matching handle | X (Twitter)declared on ctjs.rocks via homepage link with a matching handle |
| Official website | surviv.io | ctjs.rocks |
| 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.
surviv.io is Free; ct.js is Free. Both are listed in Games on ToolDock.
What they have in common: #2d
surviv.io is listed as free; ct.js is listed as free. 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 2d.
ToolDock keeps a tag-matched alternatives list for each: see surviv.io alternatives and ct.js alternatives.