How many copies did Exo One: Prologue sell?

19k to 30k copies, based on its 746 Steam reviews. This is a labeled estimate from the review count, not exact sales.

How much revenue did Exo One: Prologue make?

Exo One: Prologue is free to play, so there is no copy-sales revenue to estimate.

How big is Exo One: Prologue?

Estimated players who have it: ≈ 19k–30k; from 746 reviews (Very Positive)

Copies are estimated from the public review count, adjusted for release year, and cross-checked against SteamSpy's own estimate.

Did the prediction match what actually happened?

We hid Exo One: Prologue and predicted how it would do from its 8 similar games. Every figure here, including Exo One: Prologue's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 423–2k

best case 172k (Exo One)

Games like Exo One: Prologue

A typical game among these

≈ 423–2k copies

≈ $754–$9k after Steam's cut

from ~17 reviews

Only the top fifth of 2019's Steam releases earned $34k or more before Steam's cut, so plan for that or less.

1 of the 8 similar games is a hit.

Best case: Exo One at ≈ 131k–213k copies, ≈ $612k–$1.6M after Steam's cut. It is a breakout hit, far above a typical game.

What their first month looked like

About half the games that made it here had over 6 reviews in their first month; the range was 2 to 2k.

Games with under about 100 reviews in month one almost never recover.

The genre you'd be entering

These games: The similar games share Space (6 of 8) and Flight (4 of 8).
The winners: Winners here lead with Exploration + Space, priced around $17. The breakout hits carry Physics + Walking Simulator + Relaxing; a typical game here doesn't.
When they shipped: The similar games span 2016 to 2024, and 1 of the 8 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 52 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
Exo One 2021	Est. copies ≈ 131k–213k 311x vs typical SteamSpy 200k–500k	Est. revenue $612k–$1.6M after Steam's cut $1.1M–$2.5M before Steam's cut	$16.99	5k reviews Very Positive	AtmosphericExploration
Earth Analog 2021	Est. copies ≈ 3k–5k 6.6x vs typical SteamSpy under 20k	Est. revenue $15k–$41k after Steam's cut $28k–$64k before Steam's cut	$19.99	113 reviews Mixed	SpaceExploration
Tales of Cosmos 2016	Est. copies ≈ 2k–3k 3.0x vs typical SteamSpy under 20k	Est. revenue $9k–$24k after Steam's cut $16k–$36k before Steam's cut	$14.99	51 reviews Very Positive	AdventureIndie
Jetscout: Mystery of the Valunians 2020	Est. copies ≈ 521–846 SteamSpy under 20k	Est. revenue $715–$2k after Steam's cut $1k–$3k before Steam's cut	$4.99	21 reviews Positive	Precision PlatformerFlight
stardust 2021	Est. copies ≈ 298–484 SteamSpy under 20k	Est. revenue $409–$1k after Steam's cut $744–$2k before Steam's cut	$4.99	12 reviews Positive	AtmosphericSurreal
Asteroid Five 2022	Est. copies ≈ 347–564 SteamSpy under 20k	Est. revenue $571–$2k after Steam's cut $1k–$2k before Steam's cut	$5.99	14 reviews Mostly Positive	AdventureExploration
Silverwing 2022	Est. copies ≈ 298–484 SteamSpy 20k–50k	Est. revenue $409–$1k after Steam's cut $744–$2k before Steam's cut	$4.99	12 reviews Mostly Positive	Space SimAction
Flight Risk 2024	Est. copies ≈ 422–685 SteamSpy under 20k	Est. revenue $115–$309 after Steam's cut $209–$475 before Steam's cut	$0.99	17 reviews Positive	FlightPuzzle