GURPS vs Ishanekon: World Shapers

Compare GURPS and Ishanekon: World Shapers side by side. See differences in complexity, dice, genre, cost, and more.

	GURPS	Ishanekon: World Shapers
Genre	Universal	Universal
Play Style	Crunchy, Simulation, Sandbox, Character Building, Tactical, Grid-Based	Character Building, Crunchy, Tactical, Toolkit, Hackable, Open Source
Core Mechanic	Roll 3d6 under target number. Advantage/disadvantage system via character traits.	Skill Check — roll d10, add your level in the relevant Skill plus half the matching Stat Bonus (a stat's value minus 10), and meet or beat a difficulty from 1 (Very Easy) to 19 (Nearly Impossible). Attacks instead roll d20 plus a weapon's hit bonus against the target's Evasion. Combat runs in rounds where each character spends three Action Points per turn, with an attack costing two and a natural 20 adding bonus damage. The GM awards Narrative Momentum for inventive roleplay, which players spend together with Action Points on Cinematic Actions — freeform stunts resolved at the GM's discretion.
Dice	3d6	d4–d20
Complexity	Very High	High
Accessibility	High	Very High
Runnability	High	High
License	SJ Games Online Policy	CC BY 4.0
Cost	Free (Lite) / $$$	Free
Publisher	Steve Jackson Games	Blaze Reason
Year	2004	2022
Best For	Groups who want a single system for every genre with granular simulation and deep customization.	Groups who want maximal character customization in a free, setting-agnostic system — players who enjoy assembling a bespoke concept from a huge option pool and a GM willing to supply the world the rules deliberately leave blank.
Highlights	Highly customizable point-buy system, simulation-focused, one system for any genre	Characters are assembled from ten Archetypes, more than 210 Sub-Archetypes, over a thousand Abilities, plus Paths, Talents, and Traits, giving a single concept many independent axes of mechanical customization. Abilities draw on a Willpower pool, and spending extra Willpower upcasts them on the fly — scaling effects like damage, area, targets, or duration up to a per-tier limit — so one ability flexes to the moment instead of being a fixed effect. Every feature carries a complexity rating from 1 to 4, and Beginner Traits, a Cinematic Rules mode, and thirteen alternative-rule modules let a group run the same engine as a rules-light game or a dense tactical one.
Considerations	Character creation requires significant point-budget planning, combat rules are granular with many modifiers to track, full system spans two 576-page core books plus supplements, GM prep is substantial for campaigns using multiple sourcebooks	Character creation draws from over a thousand abilities plus hundreds of talents and traits, so building a character means selecting from a very large catalogue rather than a curated short list. The system is setting-agnostic and ships with no default world, so a group must supply or adapt a setting before the customization options mean anything in play. Skill checks and attacks resolve on separate scales — d10 plus half a Stat Bonus for skills, d20 plus full bonuses against Evasion for attacks — so the two halves of the system use different math players must keep straight.