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About this app

Make sure to check this before your round this weekend!

From Shin Perio calculations to caddie etiquette, a complete guide to mastering Korean golf.

Green Book — The essential golf app to consult anytime during a round

"Where do I hit the ball if I hit out of bounds?"

"How much should I pay for the caddie fee?"

"Is it okay to clear branches out of a bunker?"

"How do I calculate a four-ball bet?"

These are questions you are bound to encounter while enjoying a round. Solve them all with just Green Book.

【55 Golf Rules】

A practical rules guide organized according to the latest 2019 R&A/USGA revisions.

OB & Lost Ball: From declaring a provisional ball to local rules for fairway drops

Water Hazards: A complete guide to relief methods using yellow and red stakes

Greens: Flagstick rules revised in 2019, ball marks, and the 10-second rule

Bunkers: No tackling, loose impediments, and raking

Drops & Relief: Knee-high drops, relief zones, and GUR processing

Balls & Equipment: Wrong ball processing, the 14-club limit, and rangefinder rules

Scores & Competition: Scorecard errors, match play, ESC, and handicap application

Complex rules are explained with simple examples, and you can check at a glance whether there are any penalties.

【53 Korean Golf Etiquette Tips】

We have captured the culture and manners applicable only at Korean golf courses, which you absolutely cannot find in foreign apps.

Caddie Culture: Caddie fee standards, tipping etiquette, titles, things not to do to caddies

Betting Culture: Shin Perio calculation, Skins, Nearest to the Pin, no sand bagging

Cart Etiquette: No-entry zones, proper waiting locations, no driving a cart after drinking

Game Progression: Prepared golf, consideration for the group behind, giving and receiving OKs, no forcing lessons

Attire: Dress code, winter/rain attire, golf shoe etiquette

Safety: Shouting "Fore!", evacuating from lightning, maintaining a safe distance from the group ahead

Others: Social media verification etiquette, reservation cancellation culture, handling marshals, playing rounds with foreigners

【Key Features】

Quick Search — Instant search by context keywords (e.g., "OB", "Caddie", "Bunker")

Category Filter — View only the categories you want

Favorites — Bookmark frequently confusing rules/etiquette

Truly Offline — Use without internet

Fast Loading — Serverless local app, instant launch

From beginner golfers to single-digit handicaps, on the green Confidently.

The night before the round, open the Green Book.

What’s new

- 벌타 계산기를 추가했습니다!