Luke: AI Companion & Journal
Auto diary, fully on-device
Only for iPhone
Free · In‑App Purchases
iPhone
Luke turns your photos and places into a journal you never had to write, then talks with you about it like a friend who was there. Everything stays on your iPhone.
Luke is a lifelog that remembers your life, and keeps every bit of it on your iPhone.
Give Luke access to your photos and location, and it quietly builds a journal you never had to write: where you went, who you were with, what the day looked like. Ask about any of it in plain language, and Luke answers from your own memories, not from the internet.
JOURNAL
• A timeline for every day, built from your photos and the places you visited
• Add a note, a voice memo, or a mood in seconds
• Month and year views to look back on any stretch of your life
MEMORIES
• People: Luke recognizes faces on your iPhone and shows who you spend time with, as a ranking, a circle, or a connection graph
• Places: your rhythm across home, work, and favorite spots, with the visit history of each
• Timeline: month highlights, trips, and then-vs-now comparisons
• Chats: import a LINE or WhatsApp chat and see your story with someone as charts and a portrait
TALK
• Chat with Luke about your past: "When did I last see Priya?" "Where did we eat in Lisbon?"
• Answers are grounded in your photos, places, and diary, with the photos to prove it
• Call Luke and talk out loud, or record a dinner or a meeting; transcription and speaker recognition run on the phone
• Runs a language model on the phone itself. Optional 3.4 GB download over Wi-Fi; nothing you say leaves the device
PRIVATE BY DESIGN
• No account. No cloud. Photos, faces, locations, conversations, and diary never leave your iPhone
• App Lock with Face ID, hide or delete people, export your data, back up and restore, or erase everything in one tap
• Sharing anonymous usage statistics is off by default
LUKE PRO (optional subscription)
Everything above is free, including voice calls and recorded conversations. On the free plan, text conversations and voice calls each have a daily limit; a call already in progress is never cut off, and both reset at midnight. Luke Pro removes the daily limits and adds Agent Access, so AI tools on your own computer can search your memories. $4.99 per month or $29.99 per year after a 7-day free trial. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel it in your Apple Account settings.
Privacy Policy: https://ryuichi-sumida.github.io/luke-legal/privacy/
Terms of Use: https://ryuichi-sumida.github.io/luke-legal/terms/
REQUIREMENTS
iPhone 15 Pro or later with iOS 27 and Apple Intelligence turned on. Photos access and Always location are required for Luke to build your journal.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Ryuichi Sumida, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ryuichi Sumida
- Size
- 736.7 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 27.0 or later and a device with the A17 Pro chip or later.
- iPhone
Requires iOS 27.0 or later and a device with the A17 Pro chip or later.
• iPhone 15 Pro
• iPhone 15 Pro Max
• iPhone 16
• iPhone 16 Plus
• iPhone 16 Pro
• iPhone 16 Pro Max
• iPhone 16e
• iPhone 17 Pro
• iPhone 17 Pro Max
• iPhone 17
• iPhone Air
• iPhone 17e
• iPhone 18 Pro
• iPhone 18 Pro Max
• iPhone Duo
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Luke Pro $29.99
- Luke Pro $4.99
- Copyright
- © 2026 Ryuichi Sumida