Which repository has the largest number of games: Proton, Steam, Heroic, and others?

Here's the latest information on the number of games available and catalog compatibility for Steam, Proton/ProtonDB, Heroic (Epic via Heroic), the Epic Games Store, and GOG. The answer is simple: Steam has the largest catalog by far.

Quick comparison (summary)

• Steam — largest catalog by a wide margin (millions of product entries including games, DLC, apps; hundreds of thousands of distinct playable games).

• Epic Games Store (via Heroic) — far smaller than Steam (tens of thousands of titles). Heroic is a launcher that accesses Epic’s catalog; it does not itself host a larger catalog than Steam.

• GOG — smaller than Epic; focused on curated DRM‑free catalog (thousands of titles).

• Proton / ProtonDB — not a storefront; Proton is a compatibility layer for running Windows games on Linux and ProtonDB is a community database of compatibility reports covering many Steam/Epic/GOG titles. ProtonDB’s entries reflect games from other stores rather than being a separate catalog larger than Steam.

Catalog size — quick sourced counts

Platform	Most relevant metric	Count (approx.)
Steam (store)	Total store listings / games	~70,000–60,000 playable games.
Epic Games Store (catalog)	Total titles available on Epic	~10,000–12,000.
GOG (catalog)	Total games on GOG	~7,000–8,000.
Proton / ProtonDB	Proton is a compatibility layer; ProtonDB entries reflect games tested (not a storefront)	ProtonDB lists ~100,000+ game reports / entries (covers many Steam/Epic/GOG titles).
Heroic (launcher)	Heroic is a third‑party launcher for Epic/GOG/other stores; it does not host its own catalog	Uses Epic/GOG catalogs (so smaller than Steam).

Short explanation and context

• Steam has by far the largest game catalog among the stores you listed; its store hosts tens of thousands of distinct playable games, plus DLC and non‑game products.

• Epic Games Store (and therefore Heroic when it accesses Epic content) has a much smaller catalog than Steam — on the order of ten thousand titles. Heroic itself is a launcher and doesn’t add extra unique titles beyond the stores it connects to.

• GOG is more curated and smaller than Epic and Steam.

• Proton is not a store; ProtonDB is a community compatibility database that aggregates reports for many games across stores — its entry count can exceed individual store catalogs because it covers titles from Steam, Epic, GOG, and others.