Traveller Trade Simulator

A free, browser-based speculative trade companion for Traveller campaigns — Classic Traveller, T5, and Mongoose 2022.

🌐 Live app: https://code-monki.github.io/trav-trade-sim/ 🛠 Source: https://github.com/code-monki/trav-trade-sim

What Is It?

The Traveller Trade Simulator is a web tool that brings speculative trade to the table — built on live data from the Traveller Map API and covering nine milieus, from the Interstellar Wars through Year 1900. Referees and players connect to a shared campaign in real time — no installation, no accounts, no email. Just a campaign code and a PIN.

Prices shift every jump-week based on world trade codes, active market events, and a deterministic seeded engine that keeps every player's view in sync without a central server doing the rolling. Pick a ruleset per campaign — Classic Traveller Book 7, T5, or Mongoose Traveller 2022 — and the trade math, passage fares, and freight/mail rules follow it.

For Players

• Market tab — See purchase and sale prices for all 36 trade goods at the current world, updated each tick. Goods affected by active events are highlighted.
• Price charts — Weekly, monthly, annual, and realized (actual trade prices) candlestick charts (TradingView-style) show price history the moment you first visit a world, thanks to automatic backfill.
• Jump tab — Identify the most profitable destination for your cargo before you commit to a jump.
• Cargo hold — Track what you're carrying, what you paid, and your running profit/loss.
• Passengers, mail & freight — Book High/Middle/Low passage, accept Imperial mail contracts, and haul freight lots; manifests auto-deliver and pay out on arrival.
• Fuel — Buy refined or unrefined fuel priced by starport class, with a fill-level bar and a one-click "fill for jump."
• Aboard & Reports — See everything currently aboard your ship in one place, plus a full ledger, trade history, and income breakdown filterable by date range.
• Fleet & organizations — Track ship debts, ownership shares, and net worth; found or join an organization to pool dues and disburse funds across a fleet.
• Mobile-friendly — On a phone, the sector/world sidebar collapses out of the way, the header stays to one compact row, and the price chart moves into a drag-to-resize bottom sheet with a tap-to-select Compare mode for plotting multiple goods — no more crushed tables or off-screen controls. Desktop is unaffected.

For Referees

• One-click campaign setup — New Campaign pre-fills with generated Traveller-flavored defaults (name, code, referee name) so you can start playing without typing anything, or tap 🎲 to randomize everything — including a starting date consistent with the milieu's canonical era. The PIN is always yours to choose.
• Market events — Create narrative price events (shortage, trade fair, pirate blockade) with independent buy-side and sell-side modifiers, scoped to a single world or an entire subsector. Events fire automatically at random (M.U.L.E.-style), stack with manual ones, and draw from a 20-entry catalogue.
• Tick control — Advance the in-game clock with a single button. Prices recalculate, random events may fire, and monthly/annual OHLC rollups happen automatically.
• Ship & fleet tools — Manage ships, crew assignments, skills, and PIN resets, plus reusable ship templates, per-ship debts, and joint ownership shares.
• Organization financials — Set dues rates and collection frequency, disburse funds, and review fleet-wide P&L.
• Full audit trail — Every transaction and market event is logged with Imperial date stamps and price history, so players can review the tape after the session.

Technical Notes

• Runs entirely in the browser (Vue 3 + Vite); backend is Cloudflare Workers (Hono) + D1 (SQLite at the edge).
• No PII collected — identity is campaign code + character name + hashed PIN only.
• Application code is open source under Apache License 2.0; the Traveller game rules and trade mechanics are used under a non-commercial fan-project arrangement consistent with Mongoose Publishing's fair use policy.
• Free to use. No ads, no accounts, no data sold.

Traveller is a registered trademark of Mongoose Publishing Ltd. This is an unofficial fan project and is not affiliated with or endorsed by Mongoose Publishing.