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How many copies did Harbor Captain sell?

Estimated copies sold
≈ 124–202
$443–$1k after Steam's cut $805–$2k before Steam's cut
from 5 reviews (5 user reviews)
Only 5 reviews so far, so that range swings on one or two people. Read it as a hint, not a measurement.

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 Harbor Captain and predicted how it would do from its 8 similar games. Every figure here, including Harbor Captain's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 135k–594k
best case 848k (Blackwake)
Games like Harbor Captain

A typical game among these

≈ 135k–594k copies

≈ $899k–$2.4M after Steam's cut

from ~5k reviews

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

7 of the 8 similar games are hits.

Best case: Blackwake at ≈ 646k–1.0M copies.

What their first month looked like
About half the games that made it here had over 1k reviews in their first month; the range was 1 to 13k.
The genre you'd be entering
These games
The similar games share Naval (7 of 8) and Pirates (5 of 8).
The winners
Winners here lead with Pirates + Naval Combat.
When they shipped
The similar games span 2005 to 2025, 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 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

Blackwake
2020
Est. copies
≈ 646k–1.0M
4.9x vs typical
SteamSpy 500k–1M
Est. revenue
Free
Free
26k reviews
Very Positive
PiratesMultiplayer
Windward
2015
Est. copies
≈ 177k–288k
SteamSpy 200k–500k
Est. revenue
$487k–$1.3M after Steam's cut $886k–$2.0M before Steam's cut
$9.99
4k reviews
Mostly Positive
PiratesNaval Combat
Spilled!
2025
Est. copies
≈ 132k–214k
SteamSpy 50k–100k
Est. revenue
$217k–$584k after Steam's cut $395k–$898k before Steam's cut
$5.99
5k reviews
Very Positive
ShortRelaxing
Sid Meier's Pirates!
2005
Est. copies
≈ 478k–777k
SteamSpy 200k–500k
Est. revenue
$1.3M–$3.5M after Steam's cut $2.4M–$5.4M before Steam's cut
$9.99
8k reviews
Very Positive
PiratesOpen World
Naval Action
2019
Est. copies
≈ 428k–695k
2.8x vs typical
SteamSpy 200k–500k
Est. revenue
$2.4M–$6.3M after Steam's cut $4.3M–$9.7M before Steam's cut
$19.99
15k reviews
Mixed
SailingNaval Combat
Maelstrom
2019
Est. copies
≈ 74k–121k
SteamSpy 200k–500k
Est. revenue
Free
Free
3k reviews
Very Positive
Free to PlayPirates
Fishing: North Atlantic - Enhanced Edition
2020
Est. copies
≈ 69k–112k
SteamSpy 200k–500k
Est. revenue
$662k–$1.8M after Steam's cut $1.2M–$2.7M before Steam's cut
$34.99
3k reviews
Mostly Positive
SimulationFishing
Docking Ships
2023
Est. copies
≈ 74–121
too small to compare
SteamSpy under 20k
Est. revenue
$20–$55 after Steam's cut $37–$84 before Steam's cut
$0.99
3 reviews
3 user reviews
RelaxingPuzzle

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