About Offerbook

A free Grand Exchange trading terminal for Old School RuneScape. Every margin is after the GE tax, every ranking accounts for how much actually trades, and every number shows its working.

What you can do here

Economy: what to flip right now, sized to your bankroll.
Screener and Terminal: the whole board, filtered your way.
Strategies: other ways the GE pays, like high alchemy, sets and decanting.
Alerts: a message when a price or margin crosses a line you set.
RuneLite plugin: syncs your own trades into a flip journal. It is submitted to the RuneLite Plugin Hub and waiting on review, and its source is public.
Glossary: what every term on the site means, in plain words.

Where the numbers come from

Prices come from the OSRS Wiki real-time prices API, a RuneLite and WeirdGloop project. We read it once a minute, which is how often it updates.

Every margin subtracts the 2% GE tax, including its 5m cap per item and the list of exempt items.
Profit per hour never assumes you can buy more than the 4-hour buy limit allows.
One-off stray trades, like a 1 gp panic sale, are kept off the board instead of ranked.
Wherever the age of a price matters, it is shown next to it.

What it will never do

Automate anything in the game, or ask for your RuneScape login.
Run ads, or sell or share your data.
Have anything to do with trading gold or items for real money.

The plugin only reads your own GE offers. It can never act on your account.

How it is paid for

The math is free and stays free: margins, the full board, live prices, the Terminal and plugin sync. Pro launches in January 2027 and lifts the caps on alerts and saved screens and adds journal analytics. Nothing can be bought today; the waitlist holds early-bird pricing.

Independence

Offerbook is an independent project, not affiliated with or endorsed by Jagex Ltd. Old School RuneScape and RuneScape are trademarks of Jagex Ltd. It is also independent of the OSRS Wiki, WeirdGloop and RuneLite, whose public data and tools it builds on.

Contact

Questions, corrections, or a number you think is wrong: hello@offerbook.gg. Corrections to the math are the most welcome email we get.

See also the privacy policy and the terms.

What you can do here

Economy: what to flip right now, sized to your bankroll.

Screener and Terminal: the whole board, filtered your way.

Strategies: other ways the GE pays, like high alchemy, sets and decanting.

Alerts: a message when a price or margin crosses a line you set.

RuneLite plugin: syncs your own trades into a flip journal. It is submitted to the RuneLite Plugin Hub and waiting on review, and its source is public.

Glossary: what every term on the site means, in plain words.

Where the numbers come from

Prices come from the OSRS Wiki real-time prices API, a RuneLite and WeirdGloop project. We read it once a minute, which is how often it updates.

Every margin subtracts the 2% GE tax, including its 5m cap per item and the list of exempt items.

Profit per hour never assumes you can buy more than the 4-hour buy limit allows.

One-off stray trades, like a 1 gp panic sale, are kept off the board instead of ranked.

Wherever the age of a price matters, it is shown next to it.