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Action indie game Book of Demons launched in 2018 from Thing Trunk, with the developer also serving as publisher. It has 9,453 Steam reviews at 91% positive, a very positive signal, and an initial price of $24.99.
Overview
Book of Demons is a 2018 Action game developed by Thing Trunk and published by Thing Trunk. On Steam it has gathered 9,758 player reviews, 91% of them positive, which counts as a very positive reception among indie titles in the Action category. The game is available on mac, windows, and launched at $25. The pairing of developer Thing Trunk with publisher Thing Trunk is one of the studio-publisher relationships indielist tracks, letting players find comparable games and letting developers and investors study how Action projects reach the market. indielist's white-box method estimates its lifetime sales at roughly 468,000 to 1.1 million units, with the full Boxleiter factor breakdown shown on this page rather than a single black-box figure. Within indielist's catalog of indie games mapped to their studios, publishers, and funding, Book of Demons can be compared against similar Action titles and benchmarked on review counts and estimated sales.
Reviews
9,758
Positive
91%
Steam appid
449960
Engine
Unknown
Players (snapshot)
Unavailable
Sales estimate
v1.0468K to 1.1M
units (median: 781K)
≈ $6.7M to $15.6M modeled net revenue (fixed store-cut, refund, and regional-price assumptions applied)
+ - How is this calculated?
| Factor | Adjustment |
|---|---|
| base | +50 |
| year_2018 | +15 |
| price_$25 | +5 |
| positive_91% | +10 |
| final NB | 80 |
Heuristic display range: median × [0.6, 1.4]. Boundary protection: NB ∈ [15, 150].
Methodology & limitations
Sales estimates use an additive Boxleiter-derived heuristic against public Steam review
counts. They are not authoritative sales data, and the fixed display range
is not a statistically validated confidence interval. Actual results may fall outside it,
especially for deeply discounted or bundle-heavy titles. Algorithm version
v1.0. Read the exact method and validation status.
indielist estimates lifetime unit sales for Book of Demons at roughly 468,000 to 1.1 million copies, with a median around 781,000, derived from its 9,758 Steam reviews using a multi-factor Boxleiter method (version v1.0). That median maps to approximately $11.1M in net revenue after Steam's 30% cut, regional pricing, and refunds. Unlike black-box trackers, the full calculation is shown on this page: a base review-to-sales multiplier is adjusted for release year, launch price, review sentiment, studio size, and genre, and every adjustment is listed so developers, publishers, and investors can audit exactly how the figure was reached. The range itself reflects genuine uncertainty — review-to-sales ratios vary widely between games — so indielist publishes a low, median, and high band rather than a false-precision single number, and treats free-to-play, heavily discounted, and bundle-distributed titles as having wider error margins still.
Price history
27 observed days · window low $6.24Across 27 observed UTC days from 2026-06-26 to 2026-07-22, the daily lowest tracked USD price across stores ranged from $6.24 to $24.99. The tracked-window low was $6.24 on 2026-06-26.
Real store observations · daily lowest tracked USD price across stores · missing days are not filled.
Where to buy
Affiliate disclosureLatest tracked store observations (2026-07-22 10:58 UTC), cheapest first. Prices may have changed since observation. Some are affiliate links — we may earn a commission at no extra cost to you. Learn more.
Platforms
macwindows
Frequently asked questions
- How many copies has Book of Demons sold?
- indielist estimates Book of Demons has sold between 468,384 and 1,092,896 units (median 780,640), derived from its 9,758 Steam reviews with the white-box Boxleiter v1.0 method. The full breakdown is shown on the page.
- Who developed Book of Demons?
- Book of Demons was developed by Thing Trunk and published by Thing Trunk.
- Who published Book of Demons?
- Book of Demons was published by Thing Trunk, developed by Thing Trunk. See Thing Trunk's full catalogue and submission status on indielist.
- When was Book of Demons released?
- Book of Demons was released in 2018.
- How many reviews does Book of Demons have on Steam?
- Book of Demons has 9,758 Steam reviews, of which 91% are positive.
- Is Book of Demons worth playing?
- Steam players rate Book of Demons 91% positive across 9,758 reviews. indielist doesn't score games editorially; it surfaces public review sentiment and a white-box sales estimate so you can judge reception and reach yourself.
Ecosystem
Players looking for games like Book of Demons can compare it on indielist against semantically similar Action titles such as Rust, Terraria, Phasmophobia, ARK: Survival Evolved, ranked by shared tags and genre rather than by ad spend. On the developer side, Thing Trunk's other releases and Thing Trunk's wider catalog are one click away, letting developers benchmark where Book of Demons sits among a studio's body of work and how its publisher's portfolio performs. Because indielist maps studios, publishers, games, and funding into one connected graph, the same Book of Demons page serves three audiences at once: players hunting their next Action game, developers studying how comparable projects were positioned and what they sold, and investors tracing which teams and labels are active in the space. A machine-readable markdown mirror of this page is published at the same path with a .md suffix for AI assistants, and its review, price, and sales-estimate figures are refreshed on a schedule rather than frozen at launch.
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