17on: A Haiku Poetry Journal

IROIRO LLC

In-app purchases

About this app

Capture life in three lines.
17on (pronounced "seventeen-on") is a haiku composition and journaling app: a quiet space to write in the traditional 5-7-5 form or contemporary variations. A built-in syllable counter lets you focus on the words, not the count.

A QUIET SPACE FOR DAILY HAIKU
No social feed. No algorithm. No pressure. Just you, your words, and the form that has shaped poets for centuries. Whether you keep a daily haiku practice, capture a single observation, or write your first 5-7-5, 17on stays out of the way.

INTELLIGENT SYLLABLE COUNTING
A real-time 5-7-5 syllable counter, line by line. No more counting on your fingers. 17on uses a dictionary-based approach backed by over 126,000 English words from the CMU Pronouncing Dictionary, plus hidden language data from the EDRDG dictionary.

COMPOSITION STYLES
Choose the form that fits the moment.

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.
...and more.

INSPIRATION WHEN YOU NEED IT
Swipe through an inspiration feed of timeless haiku from masters including Bashō, Issa, Buson, and Shiki. When enabled, on-device AI generates original haiku using seasonal kigo (季語), processed privately on your phone and never uploaded to the cloud.

YOUR PERSONAL HAIKU JOURNAL
Every haiku you write is saved to your journal, stored locally on your device. Search by keyword, hashtag, date, or composition style. Revisit any moment you have written down. Optional backup to Google Drive, only if you choose.

BEAUTIFUL TO SHARE
Turn any haiku into a shareable image. Choose from a collection of stationery backgrounds, pick a pen style, and select an ink color to match the mood. Share to Instagram, Messages, or anywhere else inspiration belongs.

COLLECT STATIONERY
Earn Pages by composing, sharing, and exploring the inspiration feed. Trade them at the gacha machine for new papers, pens, and inks. From everyday finds to rare treasures, build a writing kit that feels uniquely yours.

DESIGNED FOR DELIGHT
A subtle haptic on each completed line. A gentle animation when a haiku is complete. Small details that make the practice feel as intentional as the poetry.

FREE (AD SUPPORTED)
- 31 haiku across Traditional and Modern formats
- Full journal and search
- Share your creations, styled your way
- Stationery gacha for paper, pen, and ink
- Inspiration feed with famous haiku
- On-device AI haiku (where supported)

PREMIUM (ONE-TIME PURCHASE)
- Unlimited haiku
- All composition styles
- Watermark removal
- Complete creative freedom

WHY 17ON
In a world of endless scrolling, 17on offers something different: a calm, distraction-free space for brief, meaningful expression. No social feeds. No algorithmic pressure. Just you, your words, and the timeless Japanese poetry form that has inspired writers for centuries. Begin your haiku practice today.

17on is made 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.

What’s new

Send us a note, and we write back.

What's New in 2.0.2:
• Feedback is now a conversation. Your report opens a thread, and our reply lands in your feedback inbox with a notification.
• Reply from the thread until your bug or idea is settled.
• Editing an older haiku no longer breaks your streak.
• A companion re-roll now always lands on a different form.
• Optional email for IROIRO news. Off by default, never attached to your feedback.

Thank you for writing with us.
-17on