Fair games.
Real rankings.
Live, every rally.

RallyMouuu is a free, mobile-first web app for organising casual badminton, tennis, table tennis, pickleball, volleyball and other racket sports events, with fair auto-generated rotations, per-sport Elo/MMR leaderboards, and live scoring & video streaming so anyone can follow along. Pick who's playing and it builds a balanced schedule while tracking your crew's rankings. The 'mou' is a playful Malaysian-Chinese 'shall we?', so RallyMouuu reads as 'wanna rally?'.

Badminton, volleyball, pickleball, table tennis, tennis, or a custom sport of your own. Each session uses exactly one sport at a time, and ratings never combine across sports — so your badminton MMR and your pickleball MMR are tracked as completely separate leaderboards.

Yes — RallyMouuu is free for fair, personal use, so please don't abuse it. There's no paywall on running sessions, generating rotations, or viewing leaderboards. If it helps your crew and you'd like to help keep it running, you're welcome to chip in via Buy me a coffee.

You pick who's playing and RallyMouuu auto-generates the schedule. It evens out playing time, forms balanced sides by closest rating, offers a Balanced or Mixed gender mix, and caps how many rounds anyone rests in a row — across one or more parallel courts in 1v1, 2v2 or custom formats.

For each sport, RallyMouuu keeps an all-time Elo/MMR leaderboard built from every submitted game, with separate boards for solo players, pairs and named teams. Everyone starts at a 1000 baseline, and beating stronger opponents earns more. Each player card shows a rating-over-time chart, peak rating, win/loss record, best partner and toughest opponents.

Yes. You can jump straight in with no-signup Guest mode to try building a session and generating a rotation. Saved rankings and the all-time leaderboards are gated until you create a free account, so convert your guest session whenever you're ready to keep your results.

Sign in with an email and password, use 'Continue with Google' for one-tap SSO, or start instantly as a guest with no signup. Signups are open, so you can create a free account and invite your whole crew to share one roster, sessions and leaderboards.

Yes. Group players into named teams and run team-vs-team sessions that get their own leaderboard, separate from the solo and pairs boards. Each named team carries its own rating, moved only by team-vs-team results — independent of the members' individual solo ratings.

Yes — turn on RSVP for an individual session and share its public link. Anyone can join and add their own name if they're not already on the list, no account needed, and only confirmed players count toward the headcount and the auto-generated rotation.

Yes — add an address when creating a session. It autocompletes as you type and shows on an embedded map, with a one-tap link to open it in Google Maps for anyone heading over. A venue isn't required.

Yep — open a court's live scoring page and tap Go live to stream straight from your phone's camera, one live channel per court. Share the watch link (with an optional access code if you don't want it fully public) so the friends who couldn't make it down can still watch from the couch.

Yes, automatically — recordings are saved and playable right from the same watch link, no extra step needed. Don't want a copy kept? Turn off Record streams before you go live.

Yes — as the crew owner, promote a member to admin and they can rename the crew and manage the roster (add, edit, remove or link players) without needing your account. Only you can grant or revoke that access.

English, Simplified Chinese, Japanese and Korean. RallyMouuu matches your browser's language automatically, with a manual switch in Settings if you'd rather pick one yourself.

Yes, anytime — open Settings and tap Export data. Download your profile, sessions, rankings or roster as a CSV file, whenever you like, no need to ask. Exports only ever cover your own data plus whatever a crew you're in already lets you see.

Yes — RallyMouuu is a PWA, so your phone or desktop browser can install it to the home screen or app dock for a full-screen, app-like experience with no app store needed.

Yes — add costs like court fees to a session and split them by Credit Split (everyone pays whoever's owed the most, who then settles up with anyone else owed money) or Fair Split (pay each creditor directly). Each player can mark a payment sent or received, attach proof, and the host or a crew admin can confirm or revert a payment on their behalf.

Add your bank account details in Settings — payee name and account number — so anyone who owes you can copy them straight from the cost sheet or receipt. Payment details are per-player and only shown to people settling up with you.

Yes — from a session's cost sheet or its receipt page, generate a PDF invoice for the whole session or for one player's share, with a numbered invoice for your own records.

Yes — tap Search in the header to look across crews, players and sessions you have access to, then jump straight to any result.

Once a session hits its player cap, anyone who joins after that lands on a FIFO waitlist instead. If a confirmed player drops out or is removed, the next person on the waitlist is automatically promoted to confirmed and notified.