How much revenue did Summer Islands make?

$20k–$54k after Steam's roughly 30% cut, derived from the copies estimate and its price.

How many copies did Summer Islands sell?

Q: How many copies did Summer Islands sell?

5k to 8k copies, based on its 196 Steam reviews. This is a labeled estimate from the review count, not exact sales.

Estimated copies sold: ≈ 5k–8k; $20k–$54k after Steam's cut $36k–$83k before Steam's cut; from 196 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 Summer Islands and predicted how it would do from its 8 similar games. Every figure here, including Summer Islands's, is estimated from Steam reviews.

Copies, estimated from reviews

typical (middle half) 497k–928k

best case 1.0M (Dwarf Fortress)

Games like Summer Islands

A typical game among these

≈ 497k–928k copies

≈ $4.6M–$12.4M after Steam's cut

from ~18k reviews

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

All 8 of the similar games are hits.

Best case: Dwarf Fortress at ≈ 783k–1.3M copies, ≈ $6.5M–$17.4M after Steam's cut.

What their first month looked like

About half the games that made it here had over 16k reviews in their first month; the range was 1k to 21k.

The genre you'd be entering

These games: The similar games share Sandbox (7 of 8) and City Builder (5 of 8).
The winners: Winners here lead with Dwarf + Colony Sim, priced around $30.
When they shipped: The similar games span 2015 to 2026, and 2 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 61 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
Software Inc. 2015	Est. copies ≈ 385k–625k SteamSpy 100k–200k	Est. revenue $2.4M–$6.5M after Steam's cut $4.4M–$10.1M before Steam's cut	$22.99	8k reviews Very Positive	Early AccessManagement
X4: Foundations 2018	Est. copies ≈ 920k–1.5M 1.7x vs typical SteamSpy 1M–2M	Est. revenue $12.7M–$34.0M after Steam's cut $23.0M–$52.3M before Steam's cut	$49.99	30k reviews Mostly Positive	Space SimSimulation
Avorion 2020	Est. copies ≈ 362k–588k SteamSpy 500k–1M	Est. revenue $2.5M–$6.7M after Steam's cut $4.5M–$10.3M before Steam's cut	$24.99	15k reviews Very Positive	ExplorationSandbox
Dwarf Fortress 2022	Est. copies ≈ 783k–1.3M 1.7x vs typical SteamSpy 2M–5M	Est. revenue $6.5M–$17.4M after Steam's cut $11.7M–$26.7M before Steam's cut	$29.99	32k reviews Very Positive	DwarfColony Sim
Going Medieval 2026	Est. copies ≈ 535k–869k SteamSpy 500k–1M	Est. revenue $4.4M–$11.9M after Steam's cut $8.0M–$18.2M before Steam's cut	$29.99	22k reviews Very Positive	RPGEarly Access
Transport Fever 2016	Est. copies ≈ 452k–734k SteamSpy 1M–2M	Est. revenue $3.7M–$10.0M after Steam's cut $6.8M–$15.4M before Steam's cut	$29.99	11k reviews Very Positive	FlightCity Builder
Kingdoms Reborn 2020	Est. copies ≈ 242k–393k SteamSpy 500k–1M	Est. revenue $1.3M–$3.6M after Steam's cut $2.4M–$5.5M before Steam's cut	$19.99	10k reviews Very Positive	City BuilderBase-Building
Workers & Resources: Soviet Republic 2024	Est. copies ≈ 682k–1.1M 1.5x vs typical SteamSpy 500k–1M	Est. revenue $7.5M–$20.2M after Steam's cut $13.6M–$31.0M before Steam's cut	$39.99	27k reviews Very Positive	StrategySimulation