# Anniversary Tracker- Koi Diary — Relationship Day Counter

> Relationship Day Counter (iPhone/iPad app by Kobayashi Ryotaro.)

- Source: https://appshunter.io/ios/app/anniversary-tracker-koi-diary/id6752251393 (this page in markdown: same URL + `.md`)
- Developer: [Kobayashi Ryotaro](https://appshunter.io/developer/1838443062)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 12+
- Requires: iOS 15.0 · 84 MB
- Languages: American English, Japanese
- Released: 2026-01-29
- Data updated: 2026-08-27
- User reviews in markdown: https://appshunter.io/ios/app/anniversary-tracker-koi-diary/id6752251393/reviews.md

## What is Anniversary Tracker?

Make every special day with your loved one even more meaningful. Make every special day with your loved one even more meaningful. 

Koi Diary is a simple and cute relationship day counter app that helps you track anniversaries, celebrate milestones, and save precious memories — for couples and fandom moments alike.

Count how many days you’ve been together, check how many days remain until your next anniversary, or record important dates like the day you fell in love, became a fan, or your favorite artist’s debut day.

Every day becomes a moment worth remembering.

How many days have you been together?
How many days until your next special milestone?

With Koi Diary, you’ll never miss what matters most.

【Main Features】

■ Anniversary Counter
・Count days since you started dating or days until your next anniversary
・Switch between days / weeks / months / years with a single tap
・Customize backgrounds and icons using built-in wallpapers or your own photos
・Change text colors and fonts to create a screen that feels truly yours

■ Special Milestones
・Automatically highlights special dates such as 100 days, 1,000 days, repeating numbers, monthly and yearly anniversaries
・Easily check how many days remain until each milestone

■ Personal Diary
・Save memories from dates, daily life, or fan events
・Each entry shows how many days have passed since your chosen anniversary
・Add photos and notes to keep your memories like a private album

■ Secure & Private
・Protect your diary with a 4-digit passcode
・Your personal memories stay safe and private

Perfect for you if:
・You enjoy counting relationship days
・You don’t want to forget important anniversaries
・You want to keep memories in a cute and simple way
・You’re looking for a romantic but easy-to-use diary app

Turn your everyday moments into shining memories with Koi Diary 

Terms of Use
https://koisurudiary.com/terms

Privacy Policy
https://koisurudiary.com/privacy

Contact
https://koisurudiary.com/contact

EULA
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium Plan (1 Month) | $3.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Premium Plan (Lifetime) | $19.99 | one-time |



## Version history (last 5 releases)

### 1.19.2 — 2026-08-23

・Improved the tutorial flow
・Updated the customization screen design
・Added sample content to the Diary and Album sections

### 1.19.1 — 2026-08-18

・Added a new tutorial
・Made minor UI and behavior improvements

### 1.19.0 — 2026-07-29

Added iCloud Backup, allowing Premium users to securely back up and restore their precious memories.

### 1.18.1 — 2026-07-09

・Improved the design of the diary feature
・Increased the character limit for diary entries

### 1.18.0 — 2026-03-29

・Added a referral feature
・Fixed minor bugs

## Apps similar to Anniversary Tracker

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Anniversary365 -Daily memories](https://appshunter.io/ios/app/anniversary365-daily-memories/id1562118489) | — | Free | Utilities |
| [Photo Holder](https://appshunter.io/ios/app/photo-holder/id6736399057) | — | Free | Utilities |
| [IsTalk - Talk Analysis](https://appshunter.io/ios/app/istalk-talk-analysis/id1555905116) | 5.0 (2) | Free | Utilities |
| [MeroTalk \| LINE Analysis](https://appshunter.io/ios/app/merotalk-line-analysis/id6757545135) | 4.5 (4) | Free | Utilities |
| [Anniversary Tracker](https://appshunter.io/ios/app/anniversary-tracker/id1570714816) | 4.7 (1,910) | Free | Utilities |
| [MeroTalk DM \| DM Compatibility](https://appshunter.io/ios/app/merotalk-dm-dm-compatibility/id6759235144) | — | Free | Utilities |

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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 2026-08-27.*