Terms of Service

Last updated 21 October 2026

Our Terms and Privacy Policy are translated for convenience. Where the translation and the English text differ, the English version is the one that applies.

What changed on October 21, 2026. The Player lookup now shows any account’s recent ranked games, champion pool, roles and LP over the last weeks, beside its rank and the advice for its rank. It scores each of those games against games on the same champion, role and rank, and names no other player in them. An account that has opted out is not shown; how to opt out is on the opt-out page.

What changed on 23 September 2026. A player can now ask for their account to be opted out: no page shows it, and its identity is not used in predictions or in training data exported afterwards. What that does and does not do is set out on the opt-out page.

What changed on 22 September 2026. Several statements here did not match the site, and this version corrects them. Head to head shows each account’s own recent record beside the games the two played in the same match; the earlier text said it showed nothing about either account alone. The draft page’s Duo queue and Clash formats take other players’ Riot IDs; the earlier text said every page except head to head asked only for your own. Not everything the site knows comes from Riot’s API: its professional-match data comes from the public sources credited on the About page. The betting clause now says only what the site does and does not do. What these terms forbid is unchanged: tracking, profiling or monitoring a player, and compiling a record of someone’s play that they did not ask for.

KayLoL (kaylol.gg) is a free tool that estimates the probability that blue side wins a League of Legends draft, and publishes champion statistics derived from completed ranked games. These terms describe what you can expect from it and what it asks of you. Using the site means you accept them.

KayLoL is a hobby project run by one person. It is free, it carries no advertising today, and there is no company behind it. It can go offline, change, or stop without notice, and nothing here should be read as a commitment that it will not.

What KayLoL is

A model trained on millions of completed ranked games returns a probability, not a verdict. A draft scored at 45% still wins close to half the time, and the site is explicit about the size of its own edge: the Accuracy page publishes the model’s measured accuracy and calibration, including the parts that are unflattering.

The champion rankings on the Tier list are historical win rates for a cohort of players, not a measurement of how strong a champion is. That distinction is not a footnote, and the page states it permanently rather than in a tooltip.

What KayLoL is not

  • It is not affiliated with, endorsed by, or connected to Riot Games. See the notice at the bottom of every page.
  • The website does not interact with the game client, read your game files, inject anything, or automate any part of playing. The {companion} is a separate program that reads champion select from the League client on your own computer; it is offered only to invited testers, and what it reads, sends and never does is set out on its page. What the site knows comes from Riot’s API and Data Dragon, from the public professional-match sources credited on the About page, from what you type into it, and, for testers, from the companion.
  • It does not offer, facilitate, promote or link to betting or gambling, and it must not be used to inform a bet.
  • It is not advice. A prediction is for interest and practice, and which champion you pick is still your decision.

Using the site

Please do not:

  • Automate requests against the site or its API, scrape it in bulk, or proxy it to redistribute its responses. The API runs on one small server inside Riot’s rate limits, so a script that hammers it takes the site away from everyone rather than just from us.
  • Republish or resell KayLoL’s output as your own product, or present it as an official Riot Games source.
  • Use what the site shows about a player to harass, stalk or monitor them, or compile and publish a record of someone’s play beyond what the site itself shows. Looking an account up is a use the site offers: the player lookup shows any account’s solo-queue rank and record, champion mastery, recent ranked games, champion pool, roles and LP over the last weeks, from Riot’s public match data and the games KayLoL collects from it, beside advice for players of that rank; head to head compares two accounts the same way. The lookup also scores each of those games against games on the same champion, role and rank, and sets the account’s averages beside the typical ones at its rank. Neither page names the other players in a game, and an account that has opted out is not shown.
  • Interfere with the service, probe it for vulnerabilities without telling us first, or try to reach data that the published pages do not offer.
  • post anything unlawful, abusive or hateful on the ideas board or the research page, or anyone's personal information. Posts are public, and we may edit, hide or delete any of them.

Entering a Riot ID is optional everywhere it is offered. Most pages ask for your own; head-to-head asks for two, because a comparison cannot be made from one, and the draft page’s Duo queue and Clash formats take the Riot IDs of the players in the lobby. The site cannot check that an account belongs to the person who typed it. A player can have their own account opted out, after which no page shows it: see the opt-out page.

There is no email account, and nothing is charged for

KayLoL does not offer an account made with an email address and a password. What it offers is an opt-in private drafting profile that needs neither, and every page works without it. Choosing it sets one Secure, HttpOnly first-party cookie so this browser can retrieve or erase its own drafting history; it is not used for advertising or tracking. You can reach the same profile from another browser or device with a one-time code, by signing in with Riot, or by proving your League account with the profile icon the site names. Without one of those, it cannot be recovered after browser data is cleared. It is free, like everything else here.

If that changes, the draft predictor, the tier list and the metrics page as they exist today will remain available free of charge. Voluntary donations, sponsorship or an optional paid tier may be added to cover hosting; this page will be updated before any of them appears, and none of them will put a feature that is free today behind a payment.

Riot Sign-On — Riot’s own login, where Riot vouches for the account — is the primary way to link a League account on the profile page; the profile-icon check remains as a fallback. KayLoL keeps the Riot ID, server, verification method and time with your private profile, never a password, Riot token or PUUID, and it sets no cookie beyond the profile’s own. Everything the site does works without a profile and will keep working without one. What the private profile holds is set out in the Privacy Policy.

Availability and accuracy

KayLoL is provided as is, without any warranty. There is no uptime commitment. The model is retrained as new patches land and its numbers will change: a prediction describes the games in its training data, and League changes underneath it constantly. Riot’s API can be slow, rate-limited or unavailable, and parts of the site stop working when it is.

To the extent the law allows, we are not liable for any loss arising from using the site or from relying on anything it says — including lost games, lost LP, and decisions made because of a number on this page.

Your data

What the site stores, and what it deliberately never stores, is set out in the Privacy Policy — including the live retention settings of the running service, read from the service itself rather than described from memory.

Riot Games

KayLoL uses the Riot Games API under Riot’s API Terms of Use and developer policies. Champion names, images and other game assets belong to Riot Games and are used through Riot’s published developer assets. Your use of League of Legends itself is governed by Riot’s Terms of Service, not by this page.

Changes and contact

These terms will change as the site does. The date at the top is the date of the last change, and a material change will be noted on the site rather than made quietly.

Questions, corrections, takedown requests and data-deletion requests all go to the same place: contact@kaylol.gg.