About Manatab

A deck browser, editor, and rules-accurate simulator for Magic: The Gathering. It runs entirely in your browser.

What it does

Browse and build

Every deck with its mana curve, color and rarity breakdown, keep-on-seven rate, and Karsten mana-base checks. Read it as cards, as a sortable table, or as card art. Start your own by pasting a list from Arena, Archidekt, Moxfield, TappedOut, or MTGGoldfish, then edit it in place. A Lint panel names illegal cards, mana shortfalls, and curve problems as you go.

Playtest

A rules-accurate simulator compiled to WebAssembly, running the same engine as the command-line tools. Draw a sample opening hand from any deck page, or play a full game with mulligans, the stack, and combat. Take on another deck or a mirror of your own, and resume where you left off. Each deck reports how much of its list the engine implements. The engine can't play a deck that holds a card it doesn't implement yet.

Ask Tutor

An optional assistant. It reads your open deck, searches the card database, lints the list, and runs simulated matches to settle whether a change helps. Then it proposes concrete edits you can apply or undo.

lock We don't store any of your data

Not "we anonymize it" or "we only keep what we need". There is no server to store it on. Manatab is a static site: HTML, CSS, and JavaScript delivered to your browser, with no backend, no database, and no analytics.

No account, no sign-up, no email address.
No cookies, no tracking pixels, no analytics or telemetry.
Your decks are never uploaded. They live in your browser's local storage.
Nothing you type reaches us. Not deck lists, not notes, not Tutor questions. There is no "us" to reach.

The flip side of having no server: clearing your browser data deletes your decks. Nothing is backed up anywhere, because a backup would mean sending your decks somewhere. Download a single deck from its page, or export every deck you own as one archive from the decks page. That archive is also how you move your decks to another browser.

What's stored, and where

Everything below lives in your own browser and never leaves it. You can inspect or delete any of it from your browser's developer tools.

Storage key	What it holds
manatab:local-decks:v2	Decks you create or edit
manatab:favorites:v1	Decks you star
manatab:tutor:config:v1	Tutor provider, model, and API key
manatab:tutor:threads:v1	Tutor conversation history
manatab:drive-sync:v1	What Drive sync remembers about each deck
manatab:drive-sync:note-dismissed:v1	Whether the sync note was dismissed
manatab:prefs-sync:v1	When your synced preferences last changed
manatab:decks-view	Decks view mode (cards, table, or art)
manatab:decks-tab	Decks tab (mine, vault, or all)
manatab:deck-grouping	How a deck page groups its cards
manatab:deck-row-density	Dense or fat deck card rows
manatab:lint-open	Whether a deck page shows its Lint panel
manatab:sideboard-open	Whether a deck page expands its sideboard
manatab:maybeboard-open	Whether a deck page expands its maybeboard
manatab:detail-rulings-open	Whether the card detail pane expands Rulings
manatab:detail-mana-open	Whether the card detail pane expands Mana
manatab:detail-copies-open	Whether the card detail pane expands Copies
manatab:detail-draw-odds-open	Whether the card detail pane expands Draw odds
manatab:card-printings-open	Whether a card page expands Printings
manatab:card-decks-open	Whether a card page expands In your decks
manatab:card-legality-open	Whether a card page expands Legality
manatab:card-rulings-open	Whether a card page expands Rulings
manatab:kernel-save:v1	In-progress playtest game
manatab:theme	Light or dark preference
manatab:colors	Custom color theme, if you set one
manatab-cards (IndexedDB)	The card database, cached for offline use

Tutor and your API key

Tutor is the built-in deckbuilding assistant. You bring your own key: supply a key for a provider you already have an account with, and Manatab never sees it.

Manatab stores your key in this browser only, under manatab:tutor:config:v1. It never reaches us, because there is nowhere to send it.
Requests go directly from your browser to the provider you chose. No proxy, no relay. Your key and your conversation are between you and them.
Manatab stores your conversations in your browser, so a thread survives a reload. Clear them any time from the Tutor panel.
Whatever you send to a provider is then subject to their privacy policy and data handling. That relationship is yours, not ours. Check their terms if it matters to you.
Tutor is optional. With no key configured, nothing is ever sent anywhere.

What the app does talk to

These are the only outbound requests there are:

This site's own host, for the app, the WebAssembly simulator, and the card database. The database downloads once and then caches in your browser for offline use.
Scryfall's image CDN (cards.scryfall.io), to load card art as you view it.
Your AI provider, only if you configure Tutor, and only when you send a message.

None of these carry your decks or an identifier for you. They are requests for public card data and images.

Credits

Card data, rulings, and imagery come from Scryfall. This app follows their terms: it shows card images unmodified, and every art crop credits its illustrator. Rules text comes from the Wizards of the Coast Comprehensive Rules. The full legal notices are in the footer, and the source is open for inspection, including every claim on this page.

License

Manatab's own source is licensed under PolyForm Noncommercial 1.0.0, free to use, modify, and share for any noncommercial purpose. It is source-available rather than OSI open source, because it withholds commercial use.

That covers the code, not the cards. Magic's card text, rules, and imagery belong to Wizards of the Coast, and the cached card data comes from Scryfall under their terms.