How many copies did Spiral Knights sell?

1.3M to 2.0M copies, based on its 24k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Spiral Knights make?

Spiral Knights is free to play, so there is no copy-sales revenue to estimate.

How big is Spiral Knights?

Estimated owners: ≈ 1.3M–2.0M; from 24k reviews (Very Positive)

A labeled estimate from the public review count (adjusted for release year), not exact sales. Owner data cross-checked with SteamSpy.

Does this actually work?

We left Spiral Knights out and predicted the genre from its 8 similar games. Every figure here, including Spiral Knights's, is estimated from Steam reviews, not self-reported sales.

Copies, estimated from reviews

typical (middle half) 4.5M–12.2M

best case 29.3M (The Binding of Isaac: Rebirth)

The Dungeon Crawler genre

All 8 of your similar games are hits. A big, proven genre for a game like yours.

A hit here: 1,000+ reviews, roughly $150k+ before Steam's cut (a standard indie benchmark).

A typical game

≈ 4.5M–12.2M copies

≈ $32.8M–$91.9M after Steam's cut

from ~192k reviews

Best case

≈ 22.3M–36.3M copies

The Binding of Isaac: Rebirth · ≈ $92.0M–$247.5M after Steam's cut

The genre you'd be entering

Your set: Your set clusters on Dungeon Crawler (6 of 8) and Rogue-like (5 of 8).
The winners: Winners here lead with Action Roguelike + Rogue-like, priced around $15.
The era: The games you compared span 2013 to 2024, a genre with a long track record.

Copies and revenue are rough lifetime estimates from the review count.

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
Cult of the Lamb 2022	Est. copies ≈ 3.0M–4.9M SteamSpy 2M–5M	Est. revenue $20.9M–$56.1M after Steam's cut $37.9M–$86.3M before the cut	$24.99	126k reviews Overwhelmingly Positive	Base-BuildingCute
Noita 2020	Est. copies ≈ 2.3M–3.8M SteamSpy 2M–5M	Est. revenue $12.8M–$34.3M after Steam's cut $23.2M–$52.7M before the cut	$19.99	88k reviews Overwhelmingly Positive	PhysicsRogue-like
Path of Exile 2013	Est. copies ≈ 12.9M–20.9M SteamSpy 20M–50M	Est. revenue Free	Free	248k reviews Very Positive	Free to PlayDark Fantasy
Enter the Gungeon 2016	Est. copies ≈ 3.6M–5.8M SteamSpy 2M–5M	Est. revenue $14.7M–$39.6M after Steam's cut $26.8M–$61.0M before the cut	$14.99	89k reviews Overwhelmingly Positive	Bullet HellAction Roguelike
Darkest Dungeon® 2016	Est. copies ≈ 6.4M–10.4M SteamSpy 2M–5M	Est. revenue $44.1M–$118.7M after Steam's cut $80.3M–$182.6M before the cut	$24.99	161k reviews Very Positive	Turn-Based CombatDark Fantasy
Hades 2020	Est. copies ≈ 8.1M–13.1M 1.6x vs typical SteamSpy 5M–10M	Est. revenue $55.6M–$149.4M after Steam's cut $101.0M–$229.8M before the cut	$24.99	306k reviews Overwhelmingly Positive	Action RoguelikeRogue-lite
The Binding of Isaac: Rebirth 2014	Est. copies ≈ 22.3M–36.3M 2.2x vs typical SteamSpy 5M–10M	Est. revenue $92.0M–$247.5M after Steam's cut $167.3M–$380.7M before the cut	$14.99	429k reviews Overwhelmingly Positive	Action RoguelikeRogue-like
Path of Exile 2 2024	Est. copies ≈ 5.3M–8.7M SteamSpy 20M–50M	Est. revenue $44.1M–$118.6M after Steam's cut $80.2M–$182.5M before the cut	$29.99	223k reviews Mostly Positive	Action RPGHack and Slash