Supported Features
-
Dark Interface
-
Reduced Motion
Letterex — Word Duel
Grow it. Spin it. Outword.
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
A word duel on one phone — or take on The Locksmith. Free to play, no ads, no accounts, nothing tracked. One $1.99 unlock opens everything, forever.
Letterex turns spelling into a duel.
Start from a 3-letter word. Take turns reshaping it — GROW it by adding a letter to either end, or SPIN a dial to change one letter in place. Every result must be a real word. No repeats. Corner your rival and the chain seals in your favor — first to 100 points takes the match.
DUEL ON ONE PHONE
Pass-and-play battles with family and friends. No second device, no accounts, no setup — hand the phone over and outword them.
FACE THE LOCKSMITH
A cunning AI opponent with a personality. Beat him at Apprentice for free — Journeyman and Mastermind await in Letterex Complete.
THE DAILY DUEL
One shared duel a day, everywhere in the world. Same word, same spins, the Locksmith at the day's difficulty. No hints, one try — first to 100 wins. Share your spoiler-free result card and settle who's the real wordsmith.
ZEN MODE
No opponent, no clock — just you and the cylinder. Keep one unbroken chain alive for as long as the dictionary allows, with unlimited hints and an auto-spin assist.
NOTHING IS COLLECTED
No ads. No accounts. No analytics. No tracking. Works completely offline. Your words never leave your device — that's a design decision, not a settings toggle.
FREE TO PLAY — ONE UNLOCK FOR EVERYTHING
Letterex Complete ($1.99, one time): all Locksmith difficulties, 3 hints every duel, your full lifetime ledger, and Daily Duel do-overs — replay any past day from the Archive. No subscriptions. No energy meters. Buy once, own it forever.
Over 125,000 playable words. One tiny game. Endless duels.
The developer, Arko Services Inc., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- ARKO Services Inc.
- Size
- 8.3 MB
- Category
- Word
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Infrequent
Profanity or Crude Humor
Mature or Suggestive Themes
- In-App Purchases
Yes
- Letterex Complete $1.99
- Copyright
- © 2026 Arko Services Inc.