# Syn9 — Share schedules and notes

> Share schedules and notes (iPhone/iPad app by Tomohiro Sekikawa.)

- Source: https://appshunter.io/ios/app/syn9/id6758545066 (this page in markdown: same URL + `.md`)
- Developer: [Tomohiro Sekikawa](https://appshunter.io/developer/1670259539)
- Category: Productivity, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 18.0 · 57 MB
- Languages: American English, Japanese
- Released: 2026-03-27
- Data updated: 2026-10-02

## What is Syn9?

Every memory starts with a plan. Syn9 lets you make plans, share them, and keep the photos — with family and friends. Choose who sees each schedule and note: family plans for family, weekend plans for friends.

Schedules
Choose who to share each event with — family schedules for family, friend plans for friends. Each event gets its own chat so you can coordinate without losing context. Reminders and recurring events keep nothing slipping through.

Notes
Share shopping lists, trip plans, and more — with whoever you choose. Edit lists together in real time so no one's grocery list is out of sync. Lock a note to require Face ID or your passcode before it opens on your device.

Chat
Tap any schedule or note to open its chat — never lose the thread. Group with friends-of-friends without exchanging contacts. Reactions, pins, and unread badges keep things organized.

Albums
Create an album from any schedule, note, or chat, and collect everyone's photos and videos in one place. The plan becomes a memory you can look back on.

Friends
Add friends easily via QR code or a shareable link. Set your go-to share list in advance to save time every time.

Push Notifications
Get notified instantly when a schedule, note, or message is shared with you. Never miss what matters.

Koe (AI assistant)
- Say "dinner tomorrow at 7" — Koe creates the schedule
- "Share with my crew" — Koe knows your friends, groups, and the nicknames you use
- Ask anything — Koe searches the web too

Make everyday life with family and friends smoother and more fun. Give Syn9 a try.

Some features require a Syn9 Plus or Max subscription: photo and video attachments, albums, recurring events, reminders, default share lists, note folders, note lock, and monthly Koe usage.

Terms of Use & Privacy Policy:
https://syn9.jp/en/terms-of-service
https://syn9.jp/en/privacy-policy

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Plus | $3.00 | per month |
| Max | $6.99 | per month |
| Plus annual | $29.00 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Light size | $1.99 | one-time |
| Regular size | $3.99 | one-time |
| Generous size | $7.99 | one-time |


## Is Syn9 safe?

Not enough ratings yet to assess Syn9.

## Is Syn9 legit?

Syn9 appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Syn9 is 70 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.6.27 — 2026-09-29

• You can now add friends by scanning a QR code from an image
• Added a clear button to the friend search field
• You can now invite friends to past schedules
• Tapping a schedule invitation notification now opens that schedule
• Improved wording throughout the app for clarity
• Fixed an issue where some older past schedules couldn't be opened
• Fixed an issue where chats you were invited to didn't appear in the chat list right away
• Other minor improvements and bug fixes

### 1.6.26 — 2026-09-27

Improvements and bug fixes.

### 1.6.25 — 2026-09-26

- You can now leave a single past occurrence of a recurring schedule.
- Improvements and bug fixes.

### 1.6.24 — 2026-09-22

Improvements and bug fixes.

### 1.6.23 — 2026-09-21

Improvements and bug fixes.

## Apps similar to Syn9

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [PO!N: Chat Notes & Quick Memo](https://appshunter.io/ios/app/pon-chat-notes-and-quick-memo/id6755642189) | — | Free | Productivity |
| [Habit Streaks \| 1‑tap tracker](https://appshunter.io/ios/app/habit-streaks-1tap-tracker/id6753813021) | — | Free | Productivity |
| [MemoLune —chat, speak,and pics](https://appshunter.io/ios/app/memolune-chat-speakand-pics/id6752797808) | — | Free | Productivity |
| [チョイリマ](https://appshunter.io/ios/app/id6754753058) | 3.0 (1) | Free | Productivity |
| [LinkDays: Calendar Sharing App](https://appshunter.io/ios/app/linkdays-calendar-sharing-app/id6478069044) | 4.6 (25) | Free | Productivity |
| [LooSche](https://appshunter.io/ios/app/loosche/id1530317270) | 5.0 (5) | Free | Productivity |

## More apps by Tomohiro Sekikawa

- [hitoma-note](https://appshunter.io/ios/app/hitoma-note/id1670259537)
- [syn9](https://appshunter.io/ios/app/syn9/id6449186616)

All apps by Tomohiro Sekikawa: https://appshunter.io/developer/1670259539

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-02.*