Cepheus Engine vs Traveller
Compare Cepheus Engine and Traveller side by side. See differences in complexity, dice, genre, cost, and more.
| Cepheus Engine | Traveller | |
|---|---|---|
| Genre | Scifi | Scifi |
| Play Style | Sandbox, Modular, Toolkit, Simulation | Sandbox, Simulation, Exploration, Deadly, Character Building, Faction Play |
| Core Mechanic | Roll 2d6 + skill level + characteristic modifier. Meet or beat 8 to succeed. Effect (margin above/below 8) determines degree of success or failure. Lifepath character creation with careers, skills, and mustering-out benefits. | Roll 2d6 + skill + modifier ≥ 8 to succeed. Character generation is a mini-game. |
| Dice | 2d6 | 2d6 |
| Complexity | Medium | Medium |
| Accessibility | Very High | High |
| Runnability | High | Very High |
| License | OGL | Traveller Fair Use Policy |
| Cost | Free | $$ |
| Publisher | Samardan Press | Mongoose Publishing |
| Year | 2016 | 2022 |
| Best For | GMs who want a fully open, hackable classic sci-fi engine for sandbox campaigns: trade, exploration, and space combat without any IP restrictions. | Hard sci-fi sandbox campaigns with trading, exploration, and realistic space travel. |
| Highlights | Completely free and OGL, comprehensive rules covering personal combat to starship design, fully compatible with classic Traveller material | Comprehensive sci-fi toolkit, lifepath character creation, detailed trade/travel systems |
| Considerations | Dense 200+ page SRD with no setting or adventure content, lifepath character creation can kill characters before play, assumes GM comfort with sandbox prep | Lifepath character creation rolls for aging and career mishaps, so a Traveller can leave chargen weakened or pushed onto an unwanted path. Subsystem rules are spread across multiple supplements, so the core book leaves several procedures without full depth. Characteristics are recorded as a hexadecimal Universal Personality Profile string, an unusual notation newcomers must learn before they can read a stat block. |