How many copies did WWII Online sell?

94k to 153k 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: ≈ 94k–153k; 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) 521k–1.1M

best case 64.7M (War Thunder)

Games like WWII Online

The middle of these games

≈ 521k–1.1M copies

≈ $5.9M–$14.1M after Steam's cut

from ~10k reviews

Only the top fifth of 2019’s Steam releases earned about $34k gross, so plan for that or less.

All 8 of your similar games are hits.

Best case: War Thunder at ≈ 49.3M–80.1M copies. A breakout hit, far above a typical game.

The genre you'd be entering

Your set: Your set clusters on Flight (6 of 8) and Simulation (6 of 8).
The winners: Winners here lead with Simulation + Vehicular Combat. The breakout hits carry Vehicular Combat + Combat + Free to Play; a typical game here doesn't.
The era: The games you compared span 2012 to 2022, and none of them shipped in the last two years.

How these numbers were worked out

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

Copies come from each game's reviews times a sales-per-review rate that falls with release age, from about 31 for the most recent game here to about 79 for the oldest, then widened into a range; revenue rides on that estimate times price. Source: GameDiscoverCo (2020) and VG Insights (2021).

Similar games

Game	Est. copies	Est. revenue	Price	Reviews	Tags
War Thunder 2013	Est. copies ≈ 49.3M–80.1M 79x vs typical SteamSpy 20M–50M	Est. revenue Free	Free	780k reviews Mostly Positive	Free to PlaySimulation
Ace Combat Assault Horizon - Enhanced Edition 2013	Est. copies ≈ 332k–539k SteamSpy 200k–500k	Est. revenue Free	Free	5k reviews Mixed	ActionFlight
DCS World Steam Edition 2013	Est. copies ≈ 2.6M–4.2M 4.1x vs typical SteamSpy 5M–10M	Est. revenue Free	Free	41k reviews Very Positive	SimulationFlight
World of Warplanes 2022	Est. copies ≈ 140k–227k SteamSpy 1M–2M	Est. revenue Free	Free	6k reviews Mixed	FlightFPS
STAR WARS™: Squadrons 2020	Est. copies ≈ 698k–1.1M 2.8x vs typical SteamSpy 1M–2M	Est. revenue $7.7M–$20.6M after Steam's cut $14.0M–$31.8M before the cut	$39.99	28k reviews Mixed	FlightSpace
X Rebirth 2013	Est. copies ≈ 462k–751k SteamSpy 500k–1M	Est. revenue $3.8M–$10.3M after Steam's cut $6.9M–$15.8M before the cut	$29.99	7k reviews Mixed	SimulationSpace
Guns of Icarus Online 2012	Est. copies ≈ 927k–1.5M SteamSpy 2M–5M	Est. revenue $1.3M–$3.4M after Steam's cut $2.3M–$5.3M before the cut	$4.99	15k reviews Very Positive	SteampunkTeam-Based
IL-2 Sturmovik: Battle of Stalingrad 2014	Est. copies ≈ 555k–902k SteamSpy 200k–500k	Est. revenue $7.6M–$20.5M after Steam's cut $13.9M–$31.6M before the cut	$49.99	10k reviews Mostly Positive	FlightRealistic