LinkDays vs Syn9
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LinkDays
Simplify your daily schedule management with an intuitive calendar app. Easily share events with family and friends, customize your view, and organize your time with flexible recurring event settings and schedule categorization.
- Intuitive and user-friendly design
- Easy calendar sharing with family and friends
- Vertical calendar display option
- Customizable week start day
- Schedule categorization with color coding
- Flexible recurring event settings
- Dark mode compatibility
Read full descriptionHide full description
"LinkDays" is a calendar app that embodies simplicity. We have removed unnecessary features to make daily schedule management easier and more efficient, focusing on maximizing the usability of the calendar screen. Key features: * Simple and user-friendly design: Intuitive operability suitable for users of all ages. For example, you can change the font size within the calendar and the interval settings for times. * Vertical Calendar: By default, the calendar is displayed horizontally, but it can also be set to display vertically. * Easy calendar sharing: Share calendars with family or couples in just a few taps. Share schedules with loved ones, making it easier to understand each other's schedules. * Customizable: Create your own calendar to express your individuality. Customize which day your week starts on. * Schedule categorization: Assign categories to schedules and choose from a wide range of colors to make them easy to identify on the calendar. * Easy copying of events to other dates: When you need to repeat the same events amidst a busy schedule, you can copy them to another date with just a few taps. * Flexible recurring event settings: Set up events to recur weekly, monthly, or on a custom pattern to further optimize your time management according to your lifestyle. * Create schedules from history and templates: You can create new schedules from your schedule history or templates. * Options to show or hide specific traditional Japanese calendar signs and public holidays. * Dark mode compatibility. Our goal is to alleviate the scheduling concerns that users face in their daily lives. "LinkDays" is a tool to support your time management and enrich your everyday life. Message from the developers: This app was developed with passion by an independent developer. Your feedback is a valuable resource for improving the app. If you have any comments or suggestions during use, please let us know. Let's create the best calendar app together. Make your daily life more comfortable and convenient. Download "LinkDays" and start a new scheduling experience!
Syn9
Read full descriptionHide full description
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
Screenshots
Verdict
The clearest difference is ads: Syn9 at none against LinkDays's shown. Syn9 also leads on update cadence (every 5 days vs every 3 weeks). LinkDays's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.0). On price and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. LinkDays sells 2 in-app purchases, starting at $1.99 per month and Syn9 sells 6 in-app purchases, starting at $3.00 per month. Whichever you choose, the download price is not the number that matters.
LinkDays ships an update every 3 weeks, Syn9 every 5 days. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.
| Parameter | LinkDays | Syn9 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (25 ratings) — better | — |
| Positive reviews | 76.9% of reviews | — |
| Number of ratings | 25 — better | — |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 43 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Akito Nishiyama | Tomohiro Sekikawa |
In-app purchases
LinkDays
- Monthly Plan$1.991 Month
- Yearly Plan$19.991 Year
Syn9
- Plus$3.001 Month
- Max$6.991 Month
- Plus annual$29.001 Year
- Light size$1.99
- Regular size$3.99
- Generous size$7.99









