Choose Book of Demons
Choose Book of Demons if you want an Action, Indie, and Adventure game with Steam Leaderboards. 3,873 Steam reviews back the pick.
Book of Demons vs Idle D
Book of Demons and Idle D both land in RPG on Steam, which is why they keep getting compared. The comparison below is built from each game's Steam metadata — release year, genres, categories, Steam Deck status, price, and review score — refreshed daily by imho.run's scraper. Headline differences: Both are RPG games on Steam. Idle D is free; Book of Demons is paid (24.99 USD). Book of Demons is Deck Playable on Steam Deck; Idle D has no Deck rating yet. No login or purchase needed — scroll for the full table, the verdict FAQ, and links to ranked similar games for both titles.
Which should you pick?
Choose Idle D
Choose Idle D if you want a Free To Play experience. On Steam, it's free to play, so the barrier to trying it is zero.
Both Book of Demons and Idle D sit in RPG on Steam, so either pick lands in the same broad neighborhood. Use the side-by-side table for the feature view, or follow the "Games like" links below to see ranked alternatives for either title.
Side-by-side comparison
 Book of Demons |  Idle D | |
|---|---|---|
| Released | 2018 | — |
| Genres | Action, Indie, Adventure, RPG, Casual | RPG, Free To Play |
| Platforms | Windows, macOS | Windows |
| Steam Deck | Deck Playable | Unrated |
| Price | 24.99 USD | Free to play |
| Steam reviews | 90.3% positive (3,873 reviews) | — |
| Multiplayer | Single-player only | Single-player only |
| Developers | Thing Trunk | A&A |
Side by side
- Both are RPG games on Steam.
- Idle D is free; Book of Demons is paid (24.99 USD).
- Book of Demons is Deck Playable on Steam Deck; Idle D has no Deck rating yet.
Book of Demons vs Idle D — FAQ
- Are Book of Demons and Idle D similar?
- They overlap on RPG on Steam, so the catalogue groups them together — but "similar" depends on the specific mechanics. Use the genre + category rows above to decide whether the overlap matches what drew you to the one you've already played.
- Is Idle D free?
- Yes — Idle D is a free-to-play Steam title. Book of Demons is paid (24.99 USD).
- Does Book of Demons run on Steam Deck?
- Yes — Book of Demons is rated Deck Playable by Valve. Idle D doesn't have a Deck rating yet, so its Deck behaviour is currently unverified.