Five sites, one game, and the difference that matters is whose servers you land on
Yes, Counter-Strike 1.6 runs in a browser tab, and as of October 2026 five sites offer it: play-cs.com, dos.zone, CSJS, PlayCSOnline and this one. None of them asks you to install anything. Where they really differ is the server list behind the Play button. Three run servers of their own, from two to a few dozen, dos.zone does not say what its servers are, and one connects to the public CS 1.6 network that people with the original game play on. That decides how many people you will find, which maps and mods you get, and whether a server will kick you back to the menu partway through.
Join a public CS 1.6 server nowHow many people still play 1.6Everything below was read from each site's own pages on 3 October 2026, and the live counts were all taken within the same two minutes, at about 16:59 UTC. Live counts move all day, so treat them as a snapshot.
play-cs.com is the oldest of them. It launched in 2020 as cs-online.club, the address that reached the front page of Hacker News on 12 June 2020 with 878 points and 317 comments, and its own FAQ says the project has since moved to play-cs.com. PlayCSOnline and CSJS are newer. CSJS is open source: its footer says it is built on the GPL-licensed Xash3D FWGS engine, and it links its source on GitHub. dos.zone is the DOS-games archive run by the author of js-dos, and Counter-Strike is one title in its catalogue. This site runs the same Xash3D FWGS engine with the Counter-Strike client, compiled to WebAssembly.
| Version | Servers behind the Play button | Account | Phone | What costs money | Limits the site states |
|---|---|---|---|---|---|
| play-cs.com | Its own classic servers plus private servers players rent from it: 52 active, 736 players online on its counter | Optional: play as a guest or sign in | No. Its FAQ says a mobile version is under development | Gold, bought through a donation system; a premium tier; a skin shop; renting a server | Classic servers send you back to the main page after 20 rounds; rented servers do not. Needs at least 10 Mbps |
| PlayCSOnline | Its own servers: 3 (Classic, GunGame, Half-Life Deathmatch), 21 players online | A name to play; sign in to keep skins | Yes, with touch controls | Nothing required; weapon cases, a skin shop and a player market | Bots fill empty slots and are counted separately from people |
| CSJS | Its own servers: 2, nobody on them at the time | Not stated | A "Play on your phone" link | Nothing; donations | Open source; anyone can host a server for it |
| dos.zone | Not shown on its page | Not stated | Not stated | Nothing; the site is ad-free and funded by an optional subscription | Matches of up to 32 players |
| Combat Skirmish (this site) | The public CS 1.6 server list: 812 servers, 3,882 players not counting bots | None needed | Yes: on-screen touch controls, and an Android app | Nothing; ads on the website pages, never during a match | Servers that require a Steam ticket need the free desktop client |
A browser version is two things: the game running in your tab, and a list of servers it can reach. The first part is what each site shows in its screenshots, and all five advertise the same twenty-year-old Counter-Strike. The second part is where they split, and it is the part you notice within a minute of pressing Play.
play-cs.com, PlayCSOnline and CSJS each list the servers on their own platform: CSJS marks both of its servers as official, PlayCSOnline calls its three "our free browser-based servers", and play-cs.com's FAQ describes its list as its classic servers plus private servers rented from it. That keeps the experience controlled, since every server is configured the same way, but it also caps the population at whoever is on that one site. On 3 October at 16:59 UTC that was 736 people on play-cs.com, 21 on PlayCSOnline and nobody on CSJS. The public CS 1.6 network, the servers people with the original game have joined since 2003, had 3,882 players at the same moment across 812 servers, with bots left out of the count. That figure comes from this site's own scan of the CS 1.6 master server list, which runs every five minutes.
Playing on the public network means the server list holds every map and mod the community runs: zombie servers, surf, deathrun, jailbreak, 32-player de_dust2 that has been up for a decade, and quiet 5v5 servers. It also means the servers have their own admins and their own rules, and a few insist on a Steam login, which no browser can provide. This site lists them, and for the ones that require Steam it offers a free desktop client that uses the Steam client on your own computer to get in.
The game runs inside the browser's sandbox, so nothing is installed on your computer and the page cannot reach your files. The project has been public since 2020, first as cs-online.club and now as play-cs.com, with a Discord, a forum and a published FAQ. You can play as a guest without giving it an email address. Money is optional: Gold and premium are bought through a donation system, and its FAQ says Gold can also be earned through offers from partner sites, which are third-party sign-ups worth reading carefully before you accept one.
Two practical cautions apply to every browser version, this one included. If a site offers an account, give it a password you use nowhere else. And the "Download CS 1.6" links that several of these sites carry in their footers lead to installers, which are a different thing from the browser game and need the usual care with anything you download and run. The browser versions themselves need no download at all.
play-cs.com runs its own servers with ranks, clans and a skin shop; renting a private server there removes its 20-round limit. Its counter showed 736 players when we read it, while the public CS 1.6 network that this site joins showed 3,882 at the same time. On a phone, this site has on-screen touch controls and an Android app, PlayCSOnline states touch support, and play-cs.com says its mobile version is not ready. CSJS publishes its source code, and dos.zone lists the game in an archive of classic browser games.
For the public CS 1.6 network itself, the same servers you would join from Steam, with their maps, mods and regulars, the browser route is this site. It also runs ranked 5v5 matchmaking, Sven Co-op and PC VR from the same tab, though those matter less than the server list for most people searching this.
None of the five uses Valve's VAC anti-cheat, because VAC needs the Steam client. play-cs.com advertises its own anti-cheat and moderation on its own servers; on the public network, each server's admins and plugins do that job, as they always have. A browser version also costs some performance compared with the native game on the same computer, which a casual player will rarely notice and a competitive one might.
School and office networks are the other limit. Browser versions connect over the same kinds of connection web pages use, which is why they work on many locked-down machines, but a network that filters games by name or blocks those connections will stop them. And not every result for this search is Counter-Strike: the Counter Strike 1.6 game on Unity Play, which also ranks for it, is a fan-made Unity project its author describes as a shooter they tried to make on a phone, with no connection to the real game.