Capture life in three lines.
17on (pronounced "seventeen-on") is a thoughtfully designed haiku composition and journaling app that brings the meditative art of Japanese poetry to your fingertips. Whether you follow the traditional 5-7-5 form or prefer to explore contemporary variations, 17on gives you the tools to express yourself with precision and beauty.

Intelligent Syllable Counting
Never count on your fingers again. 17on uses a dictionary-based approach with over 126,000 English words from the CMU Pronouncing Dictionary for accurate syllable counts. Real-time feedback shows your progress as you write, line by line.

Five Composition Styles
Go beyond traditional haiku. Express yourself your way with multiple formats:

Traditional — 5-7-5, where it all begins
Modern — 4-4-6, say more with less
Lune — 5-3-5, distilled to essence
Monoku — One line, one moment
Freeform — No rules, pure expression

Find Your Inspiration
Writer's block? Swipe through an inspiration feed featuring timeless haiku from masters like Bashō, Issa, Buson, and Shiki. When enabled, on-device AI generates original haiku using seasonal kigo (季語) themes—all processed privately on your device, never uploaded to the cloud.

Your Personal Haiku Journal
Every haiku you compose is saved to your journal. Search by keywords, hashtags, dates, or composition style. Revisit your poetic journey anytime—your words are stored locally on your device.

Share Beautiful Creations
Transform your haiku into shareable images. Choose from a collection of beautiful stationery backgrounds, customize your font with various pen styles, and select ink colors that match your mood. Share to Instagram, Messages, or anywhere inspiration should travel.

Collect Stationery
Earn Pages by composing, sharing, and exploring the inspiration feed. Trade them at the gacha machine for new stationery, pen styles, and ink colors. From common finds to special treasures, build a collection that makes every haiku uniquely yours.

Designed for Delight
Subtle haptic feedback celebrates each completed line. A gentle animation marks the moment your haiku reaches completion. These small touches create a writing experience that feels as intentional as the poetry itself.

What's Included
Free:
25 haiku with Traditional and Modern formats
Full journal and search functionality
Share your creations, styled your way
Stationery gacha to collect paper, pen, and ink
Inspiration feed with famous haiku
On-device AI haiku (where supported)

Premium (one-time purchase):
Unlimited haiku
All five composition styles
Complete creative freedom

Why 17on?
In a world of endless scrolling, 17on offers something different: a quiet space for brief, meaningful expression. No social feeds. No algorithmic pressure. Just you, your words, and the timeless form that has inspired poets for centuries.
Start your haiku journey today.

17on is created by IROIRO, LLC. Syllable data courtesy of Carnegie Mellon University. Japanese dictionary data from the Electronic Dictionary Research and Development Group (CC BY-SA). Famous haiku courtesy of the Haiku Society of America. Your haiku are yours alone—AI features use a stock on-device model with no training on user content.