AIX Diary vs Nikki
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AIX Diary
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AIキャラクターが日記にコメントしてくれる、完全オフラインの日記アプリです。 12人の個性豊かなAIフォロワーが、あなたの投稿にそれぞれの口調でやさしく反応します。 【AIフォロワー一覧】 おかん・ダチ・センパイ・先生・ねこ・ギャル・詩人・ヤミちゃん・もこ・占いゴースト・まめお・れきしオタク 【特徴】 • すべてのデータは端末内にのみ保存。インターネットには一切公開されません。 • AIキャラクターが日記に個性的なコメントをくれるので、書く楽しさが続きます。 • 毎日の記録を振り返るカレンダー機能搭載。 • シンプルな操作で、日記を書くハードルをぐっと下げます。 プライバシーを守りながら、AIと一緒に日記を続けよう。
Nikki
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Lighter than a diary. Jot it down the moment it happens, tweet-style. Your days add up on their own—your lifelog. Nikki is a lifelog / diary app that lets you capture "right now" with the speed of social media. No need to brace yourself and write at the end of the day. Something you noticed, what you ate, where you went—just jot a quick line when it comes to mind. Because it's easy, you'll actually keep it up. ■ Great for people who - Start a diary but quit after a few days - Want to capture daily life casually, like on X / SNS - Want to log photos, places, and tags too - Want to look back and enjoy past memories - Use multiple devices (phone + PC) ■ Features (free plan) - Social-style timeline UI - Text + photo posts - Places (search via Google Places) - Tags - Calendar & "Trail" for looking back (Media / Map / Tags, plus category rankings for your favorite places) - Reply & quote to connect your own posts like a thread - Dark mode / 11 languages ■ Plus (¥680/mo or ¥5,800/yr) - Video posts (up to 5 min, 20/month) - Unlimited photos and places - Ad-free - Offline posting (auto-sync) - Data export (coming soon) ■ Notion sync (power feature) Your entries can auto-sync to Notion—tags, dates, places, and photos included. Perfect for long-term storage and organization. Built solo, updated daily. Feedback, ideas, and bug reports are all welcome. Support: nikki@fairvalue.jp Privacy Policy: https://nikki-notion.pages.dev/privacy.html Terms of Use: https://nikki-notion.pages.dev/terms.html
Screenshots
Verdict
The clearest difference is in-app purchases: AIX Diary at none against Nikki's 2. AIX Diary also leads on iOS requirement (13.0 vs 15.1). On price, ads and device support 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. Nikki sells 2 in-app purchases, starting at $4.99 per month. AIX Diary asks for nothing beyond the download.
| Parameter | AIX Diary | Nikki |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Daily |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 43 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | NAOKI MURASE | TARO KATSUKI |
In-app purchases
AIX Diary
No in-app purchases
Nikki
- Nikki Plus Monthly$4.991 Month
- Nikki Plus Yearly$44.991 Year









