Why lazer private servers are a special case
osu!lazer is the open-source rewrite of the rhythm game. Its own repository calls it "the future – and final – iteration of the osu! game client", and Wikipedia describes the older osu!stable as being in maintenance mode. Most private servers were built around stable, so lazer support is the exception rather than the rule.
This explainer covers how a lazer client reaches a private server, what that means for safety and which listed servers support it. For the full list of servers by style, see the osu! private server directory and the Relax and Autopilot servers page.
- Lazer code licence
- MIT
- Official audience
- About 20,000 daily
- Lazer servers in our research
- 2 of 17
Per Wikipedia; assets are CC BY-NC
Players, with 30 million accounts, July 2025
somtum.fun and Torii
What the official lazer client does
Stable players switch servers with a launch flag, a switcher or a patcher: the research behind our directory shows servers such as Datenshi using the -devserver flag. Lazer has no equivalent setting in the code we read. In the public repository, the production endpoint class points the website and API at osu.ppy.sh and the spectator, multiplayer and metadata services at spectator.osu.ppy.sh. The game base class picks development or production endpoints depending on whether the build is a debug build, and the desktop launcher parses only a few arguments, none of them a server address.
| Route | How it works | Examples in our research |
|---|---|---|
| Stable with a launch flag | Start osu!stable with -devserver and the server's domain | Datenshi (-devserver datenshi.pw), osu!gatari (switcher or -devserver) |
| Stable with a patcher | The server's own patcher or installer points stable at its servers | Titanic, Nekosu, osu!era, Somtum Patcher |
| Lazer fork or custom build | A separate lazer build supplied by the server | somtum.fun (TumThai), Torii (lazer.shikkesora.com) |
| Unmodified official lazer | Built for the official endpoints only | Not a private server route |
Lazer-ready servers we have reviewed
Two of the seventeen osu! servers in our directory research list lazer support. somtum.fun is a fan-run server from Thailand that supports stable and lazer clients. Its FAQ says you play with TumThai, described as its osu!lazer client, or with osu!stable through the Somtum Patcher, and that one account works in all of them. Torii runs at lazer.shikkesora.com, which signals a lazer focus, and its Discord reported 335 members and 86 online when we checked.
| Topic | Detail |
|---|---|
| Lazer client | TumThai, which the server describes as its own osu!lazer build; installable or portable |
| Platforms | Windows, Linux, macOS and Android, and it updates itself |
| Stable route | Somtum Patcher or the Somtum Launcher |
| Registering | In the game client, then sign in on the website with the same name and password |
| Accounts | One account; VPN, proxy, Tor and hosting-network sign-ups blocked; one account per network per day |
| Scores | Only its launcher, patcher, TumThai and rebuilt legacy clients submit scores |
Both servers are independent communities. somtum.fun states it has no affiliation with ppy, and its FAQ says your osu.ppy.sh account and scores are not shared with it.
How to connect safely
- 1
Read the server's connection guide
Use the guide on the server's own site, not a video or forum post of unknown age. Client builds change as lazer changes.
- 2
Download only from the server's official page
A custom lazer build is an executable. Avoid reposts on file hosts and read the project's repository or changelog if it has one.
- 3
Keep it separate from your official install
The lazer README encourages players to install a release alongside stable, so a second client folder is normal. Do not point a modified client at the official servers.
- 4
Register inside the client
somtum.fun asks you to register in the game, not on the website. Use a password you do not use anywhere else.
- 5
Test with one map
Play a ranked map and check that the score appears on the server's leaderboard before you invest time.
What your scores mean on a private server
A private server runs its own leaderboards and performance points. Official pp is a ranking metric based on beatmap difficulty, and the wiki explains each score is weighted by its position among your best plays. Private servers choose their own rules. somtum.fun's FAQ lists which beatmap states earn leaderboard placement and pp.
| Beatmap state | Leaderboard on somtum.fun | pp on somtum.fun | pp on the official site |
|---|---|---|---|
| Ranked and Approved | Yes | Yes | Yes |
| Qualified | Yes | No, until it is ranked after 1 day | No |
| Loved | Yes | No | No |
| Pending, WIP, Graveyard | No | No | No leaderboards |
Relax and Autopilot are a bigger difference. The official wiki says that enabling Relax makes a play unranked, while somtum.fun says both mods have their own leaderboards, rankings and pp separate from normal play. Other servers apply their own formulas: Datenshi publishes an in-house pp calculator, and osu!era offers multiple pp eras. Do not assume pp transfers between servers or back to the official site.
Checklist before you install a lazer client
- Is the connection guide on the server's own site, and when was it last updated?
- Does the Discord show recent staff answers about the lazer client, or only old messages?
- Is the client's source or changelog public, so others can inspect it?
- Does the server explain its pp rules and anti-cheat approach on a rules page?
- Are accounts, VPN rules and the one-account policy clear before you register?
Player counts are small across this scene. In our research, somtum.fun's API showed 473 registered accounts and no one online at the time, while the largest stable server, EZPPFarm, showed 22,566 registered accounts. Compare that with the official figure of about 30 million accounts and you can see why a quiet leaderboard is normal rather than a warning sign. The status page shows whether each listed server's website answered at its last check, and read understanding server rates for how scoring and rate terms are used across games.
Stable or lazer: which should you pick?
Private server client choice
Stable-based server
- Most servers support it
- Launch flag, switcher or patcher
- Mature community guides
- Stable is in maintenance mode
Lazer-based server
- Only a few servers support it
- Requires the server's own lazer build or fork
- Works on Windows, Linux, macOS and Android for TumThai
- Follows the actively developed client
If you want the widest choice of Relax boards, communities and maps, start with a stable-based server and check the how to join a private server basics. If you play on lazer, choose a server whose guide is current and whose Discord is active. The glossary defines pp, Bancho and Relax, and how to choose a private server gives a general checklist. Remember that smaller scenes can disappear, as the history in history of private servers shows for other games.
Related pages
