How many copies did WWII Online sell?

An estimated 91k to 148k copies, based on its 4k Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did WWII Online make?

WWII Online is free to play, so there is no copy-sales revenue to estimate.

How big is WWII Online?

Estimated owners: ≈ 91k–148k; from 4k reviews (Mixed)

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

Copies, estimated from reviews

typical (middle half) 428k–986k

best case 52.2M (War Thunder)

The Flight lane

A solid, mid-sized genre: most sell around 671k copies, with a few that break out far above.

A typical game

≈ 671k copies

≈ $9.4M after Steam's cut

from ~10k reviews

Best case

≈ 52.2M copies

War Thunder

from 765k reviews

A breakout hit, far above a typical game.

7 of your 8 games sit in the typical range; 1 is a breakout hit far above it.

Copies and revenue are rough lifetime estimates from the review count; typical figures are medians per column, so they can come from different games.

The lane you'd be entering

Winners here lead with Free to Play + Simulation, priced around $35.
The breakout hits carry Vehicular Combat + Combat + Free to Play; a typical game here doesn't.
The games you compared span 2012 to 2022, a lane with a long track record.
A typical game here lands in Diamond ($1M+ before Steam's cut, est.). Tiers: Chris Zukowski's benchmark tiers.

Similar games

Game	Price	Reviews	Tags	Est. copies	Est. revenue
War Thunder 2013	Est. copies ≈ 39.8M–64.7M 78x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	765k reviews Mostly Positive	Free to PlaySimulation +6
Ace Combat Assault Horizon - Enhanced Edition 2013	Est. copies ≈ 272k–443k SteamSpy 200k–500k	Est. revenue Free	Free	5k reviews Mixed	ActionFlight +6
DCS World Steam Edition 2013	Est. copies ≈ 2.1M–3.4M 4.1x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	41k reviews Very Positive	SimulationFlight +6
World of Warplanes 2022	Est. copies ≈ 134k–218k SteamSpy 1M–2M	Est. revenue Free	Free	6k reviews Mixed	FlightFPS +6
STAR WARS™: Squadrons 2020	Est. copies ≈ 740k–1.2M 2.9x vs typical SteamSpy 1M–2M	Est. revenue $8.1M–$21.9M net $14.8M–$33.7M gross	$39.99	28k reviews Mixed	FlightSpace +6
X Rebirth 2013	Est. copies ≈ 380k–618k SteamSpy 500k–1M	Est. revenue $3.1M–$8.4M net $5.7M–$13.0M gross	$29.99	7k reviews Mixed	SimulationSpace +6
Guns of Icarus Online 2012	Est. copies ≈ 763k–1.2M SteamSpy 2M–5M	Est. revenue $1.0M–$2.8M net $1.9M–$4.3M gross	$4.99	15k reviews Very Positive	SteampunkTeam-Based +6
IL-2 Sturmovik: Battle of Stalingrad 2014	Est. copies ≈ 511k–831k SteamSpy 200k–500k	Est. revenue $7.0M–$18.9M net $12.8M–$29.1M gross	$49.99	10k reviews Mostly Positive	FlightRealistic +6