About
What the GMS Upgrade Tracker is
A free GMS boss clear calculator and upgrade planner for Interactive and Heroic worlds. See your boss clears from your stat window, then find your next upgrade. Also available through Tools, the Guide, the public API, the Discord bot, and the assistant.
Where the numbers come from
One shared calculation per mechanic
Star Force, Potential and cubing, flames, scrolling, the damage model, HEXA, and Liberation each come from a single implementation, so every page, the API, and the assistant show the same number the planner used to rank an upgrade.
GMS sources
Rates and tables come from current GMS sources: official Nexon data, live in-game tooltips and API observations, and maintainer-verified screenshots. Regional data and third-party calculators are used only to sanity-check direction; they never override a GMS value.
Calibrated against real characters
The power score and damage model are calibrated to real high-level GMS characters and cross-checked against an independent damage calculator to check estimated damage gains.
Unsupported means withheld, not guessed
When an input is missing or a mechanic is not yet supported, the tool names the item and the missing fact and leaves everything else working. Random results are never applied to your gear automatically — you enter what actually happened.
The assistant does not do its own math
Its numeric answers come from the same calculations, or they are withheld. Researched information is shown with its source, and a web source never overrides a GMS value.
Who it is for
- Players on Interactive or Heroic worlds deciding what to upgrade next against a real weekly meso budget.
- Players tracking HEXA Matrix, Liberation, Astra secondary, and Eternal progress week to week.
- Anyone pricing an Auction House listing or an unequipped item against the gear they have on.
- Guilds and parties checking boss clear pacing, and anyone browsing public rankings, character lookups, and population statistics.
Your data
Character profiles live in your browser, and nothing leaves it until you set an IGN. After that, two things are on by default and each is a toggle you can turn off in Settings:
- Auto-save to cloud — your build uploads in the background about a minute after each edit, so you can open it on another device. Off, only the Save button writes to the server.
- Public visibility— a saved build with enough gear appears on the leaderboard and gets a public character page once Nexon's rankings confirm the character. Off, both go away immediately; a link someone already has still unfurls into a card.
The Discord bot stores nothing of its own: it answers a command and discards it. The Terms and Privacy page explains what is stored, how shared builds work, and how to remove your data.
Found a number that looks wrong?
Use the Feedback button in the corner of any page with the item, the inputs you entered, and what you expected. Confirmed discrepancies become regression tests so they stay fixed. Shipped corrections are listed on the changelog.
MapleStory and all related names, logos, and artwork are trademarks of Nexon Co., Ltd. This is an unofficial fan project and is not created by, endorsed by, or affiliated with Nexon.