Compare
YGO Lab and Dueling Nexus
Both enforce the rules for you. Dueling Nexus is built for playing people, with ranked seasons and a basic bot on the side. YGO Lab is built around its AI opponent, which pilots real decklists and their combos so you can practice a matchup alone.
On this page
What Dueling Nexus is
Dueling Nexus is a free, browser-based simulator with automated rules: in its own words, it is impossible to make an invalid move. Every card is unlocked when you sign up, and new cards are added soon after they are announced, marked as beta until they are reliable. It runs ranked seasons for TCG, Genesys and Edison that reset with each banlist, and it added a manual mode in 2025. It is supported mainly by advertising.
It also has a computer opponent: Nyx, which the site calls a basic bot, with over 30 decks of its own. The most recent additions to those decks that we could find were in November 2024.
What YGO Lab is
YGO Lab automates the rules on ygopro-core, the open-source engine EDOPro runs on. The difference is the opponent. The Rival is an AI that pilots a real decklist: going first it plays the deck's combo lines, checked move by move on the engine; when you interrupt one it switches to a follow-up line; on your turn it decides when to use its hand traps.
Side by side
| YGO Lab | Dueling Nexus | |
|---|---|---|
| Rules | Automated on ygopro-core | Automated, with a manual mode |
| Computer opponent | An AI that plays each deck's combo lines | Nyx, a basic bot |
| Its decks | Real decklists, played with their combos | Over 30 decks |
| Playing people | Not the focus | Ranked TCG, Genesys and Edison seasons, and unranked play |
| New cards | The current TCG card pool | Added soon after announcement, marked beta |
| Where | Browser, on phone or desktop | Browser, on desktop or mobile |
| Cost | A free duel every week; a plan for more | Free, supported mainly by ads |
Where each one fits
Dueling Nexus is the place for automated games against people: ranked climbs, Genesys, Edison, and trying a card days after it is revealed. Its bot, which the site itself calls basic, plays its own set of decks.
YGO Lab is the place to practice a matchup when you can't find, or don't want, an opponent. The AI plays the deck the way its players do, so a game against it is a rehearsal of the real one: their combo going first, their hand traps on your turn.
When Dueling Nexus is the better choice
- You want ranked games against people.
- You play Genesys or Edison.
- You want to try newly announced cards before their TCG release.
When YGO Lab is the better choice
- You want an opponent that plays a current deck's real combos, not a basic bot.
- You want to practice going second into the board a deck actually makes.
- You want to drill a single interruption: record your turn in Combos, interrupt it with the hand trap you expect, and practice that branch until you get through it.
Moving your deck between them
YGO Lab imports a .ydk file, a ydke:// link, or a decklist pasted as text, and exports all three, so a list can go back and forth.
Questions
Does Dueling Nexus have an AI?
Yes: Nyx, which Dueling Nexus calls a basic bot. It plays over 30 decks of its own.
What is the difference between Dueling Nexus's bot and YGO Lab's AI?
Nyx is a basic bot with its own set of decks. YGO Lab's AI pilots real decklists by their combo lines, adapts when you interrupt them, and holds hand traps for your turn.
Is Dueling Nexus automated?
Yes. It enforces the rules, and since 2025 it also has a manual mode.
Is YGO Lab free?
Every account gets a free duel against the AI each week, with no credit card. Solo and puzzles are free any time.