Where the manga data comes from

Manga Vault uses its own curated catalog for all manga information — series, volumes, ISBNs, covers, metadata. We do not query third-party services (like Google Books or ISBNdb) at runtime. Here’s why and what that means for you.

How our catalog works

The catalog is a database we build and maintain ourselves. It contains:

Every series we’ve added.
Every volume of each series.
ISBNs (13-digit and 10-digit where applicable).
Cover art (sourced from publishers, with rights or fair use).
Author and publisher information.
Release dates and MSRP.
Page counts, descriptions, genres.

When you scan a barcode or enter an ISBN, the app sends the ISBN to our cloud catalog and gets the matching volume back — no third-party API call.

Why our own catalog

External services have limitations:

Inaccurate data — Many manga entries on third-party sources are mislabeled, duplicated, or have wrong covers.
Inconsistent quality — Coverage varies wildly by series and language.
Reliability — Depending on a third-party API for every scan would slow the app and create failure points.
Cost and rate limits — Many APIs charge per query or have strict rate limits.
Privacy — Sending every ISBN you scan to a third party isn’t great for privacy.

By maintaining our own catalog, we control quality, consistency, performance, and privacy.

How we add new entries

Two main paths:

Bulk catalog updates — We periodically import new releases from publisher data sources, manga distributor catalogs (like TOKYOPOP, Viz, Kodansha, etc.), and verified bibliographic sources.
User requests — When users scan a volume that’s not yet in our catalog, they can request it. Our team manually reviews and adds. See Requesting a manga.

How accurate is the catalog

Our catalog is well-maintained for:

Mainstream English-language manga (high accuracy).
Major French, German, Italian, Polish, Spanish, Brazilian Portuguese, and Japanese editions (good accuracy).
Recent releases (kept current within days to weeks).

Accuracy is lower for:

Out-of-print volumes from before our catalog era.
Obscure indie or self-published titles.
International editions in less-covered languages.

If you spot an error, contact support and we’ll correct it.

What if the catalog is wrong about a volume

Common issues:

Wrong cover art — We use the most common edition’s cover. If your specific printing has a different cover (variant, alternate edition), we may show the more common one. Let us know and we’ll add the variant.
Wrong title — Sometimes localized titles or alternate edition names get conflated. Report and we’ll fix.
Wrong page count or release date — Same — report and we’ll verify and update.

How catalog data reaches the app

Manga Vault is a thin client — the catalog data lives in our cloud, not bundled in the app:

Browse, Discover, and Library views read from a small catalog snapshot (~1 MB compressed) that the app downloads from our CDN. The snapshot updates when we publish catalog changes — usually within minutes of a request being approved. The app caches the snapshot locally so previously-browsed content stays accessible offline.
Scanning a barcode sends the ISBN to our cloud catalog and gets the matching volume back, live.
Opening a series detail page fetches the full series + all its volumes from our cloud catalog. Once loaded, the data caches locally.
Volume search queries a search endpoint that’s also live against the cloud catalog.

Going through the cloud means the data is always as fresh as our latest publish — there’s no “catalog frozen at app build time” lag.

Catalog version

You can see your current catalog version in Settings → About → Catalog Version. The version number increments as we publish new catalog updates.

Privacy: scanning doesn’t phone home with personal info

When you scan a barcode, the camera image is processed entirely on your device — we never see or store images. The 13-digit ISBN is sent to our catalog endpoint to fetch the matching volume, but we don’t tie that lookup to a profile of what you scan. We do log catalog requests (when you submit a request for a missing ISBN). Routine scans don’t generate per-user analytics on what you’re looking at.

What if a volume is in the catalog but I think it shouldn’t be

If we have an entry that’s clearly wrong (e.g., a non-manga product mistakenly cataloged as manga), contact support with the ISBN and we’ll review.

Catalog gaps

If your collection has volumes we don’t have in our catalog, request them. We prioritize requested volumes and approve quickly.

The more users use Manga Vault and submit requests, the faster catalog coverage grows.