Costan vs Lucy Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Costan
Learn everyday greetings in 14 languages to connect with people worldwide. This app promotes a peaceful, borderless world through simple, friendly communication.
- Learn greetings in 14 languages
- Promotes cross-cultural communication
- Focuses on everyday phrases
- Aims for a peaceful world
- Simple and friendly interface
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In Costan, you also Cosmopolitan from today! From "Time" and "Hello" First. Acquire the voice of the 14 languages of everyday greeting to dodge with a smile. A peaceful world without boundaries in heart!
Lucy Diary
A private and cozy digital journal for daily thoughts, dreams, and memories. Offers a clean writing space with optional premium features for enhanced customization and photo attachments.
- Daily diary entries
- Distraction-free writing space
- Privacy-focused experience
- Customization and cozy themes
- Photo attachments
- Premium diary layouts
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Lucy is a private, cozy diary for daily thoughts, dreams, reflections, gratitude notes, and memories. Free features: - Create diary entries and keep a daily writing habit. - Write in a clean, distraction-free space. - Keep personal notes in a privacy-focused diary experience. Diary+ features require an optional in-app purchase: - Extra diary customization and cozy themes. - Photo attachments for memories. - Additional personalization tools. - Premium diary layouts and styles. Whether you use the free journal or choose Diary+ for more customization, Lucy helps you keep life organized in one beautiful place. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://tahjx.github.io/lucy-legal/
Screenshots
Verdict
The clearest difference is in-app purchases: Costan at none against Lucy Diary's 3. Costan also leads on iOS requirement (15.6 vs 17.0). Lucy Diary's advantage is update cadence (weekly vs every 6 weeks). 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. Lucy Diary sells 3 in-app purchases, starting at $1.99 per month. Costan asks for nothing beyond the download.
Costan ships an update every 6 weeks, Lucy Diary weekly. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.
| Parameter | Costan | Lucy Diary |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Every 6 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 72 MB |
| Age rating | 4+ | 4+ |
| Developer | Shinichi Aokawa | Tahj Elliott |
Customer experience
Costan
Lucy Diary
In-app purchases
Costan
No in-app purchases
Lucy Diary
- Diary+ Monthly$1.991 Month
- Diary+ Yearly$7.991 Year
- Diary+ Lifetime$11.99
