Castalia: Journal & Insight
A Journal That Learns You
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
InkWell is now Castalia. Same journal, same Sophy, and a calmer look: one question to start, three ways to write, and goals with a plan for the hard moments.
Castalia is a journal for people who think in circles, forget what they figured out last month, and want one place that holds all of it. Write it or say it. Find it later. (Formerly InkWell.)
ONE QUESTION TO START
Each day opens with a single question and a blank page. Nothing here needs to be good. It just needs to be true.
WRITE IT, OR SAY IT
Type, or tap the mic and your words land on the page. Want a push? Start the timer for a timed write.
THREE WAYS IN
• Free-write: the page, with your voice and a timer when you want one.
• Gratitude: three short practices from gratitude research, one suggested each day.
• Reframe: four steps to look at a hard moment from a second angle.
SOPHY, WHEN YOU ASK
Sophy is Castalia's AI companion. She offers a prompt when you want one and a reflection after you write. She reads your journal only when you ask, or when you turn on her insight emails.
FIND WHAT YOU WROTE
Ask your recent entries in plain words, like "when did I last feel rested?", or open the calendar to any day. Search is free.
GOALS WITH A PLAN
Name what you want, picture it, plan for the snag that usually stops you, and let Sophy check the plan. Not sure what you want yet? Start from your values. Finished goals stay in your journal.
NOTICE WHAT WRITING DOES
If you like, rate how heavy a day feels before and after you write.
PRIVATE BY DESIGN
Your entries are encrypted in transit and at rest, never sold, and never used to train AI. Export all your entries and goals, any time.
FREE, AND PLUS
The full journal is free: every way to write, voice, search, goals and a daily reminder. Castalia Plus adds Sophy without a daily limit, a monthly read of your writing, cleaned-up voice entries, photos and files, and weekly and monthly insight emails if you turn them on. $6.99 a month or $49.99 a year.
Castalia is a coaching tool. It is not used for diagnosis or therapy.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://pegasusrealm.com/privacy-policy/
Made in Honolulu by Pegasus Realm.
InkWell is now Castalia. Same journal, same Sophy, new name and a cleaner look. Your entries and goals come with you, and so does Plus if you have it.
New in 2.0: one question to start each day, three ways to write, a timer right on the page, gratitude one practice at a time, and goals with a plan for the moment it gets hard. Finished goals now stay in your journal.
The developer, Pegasus Realm LLC, 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 Linked to You
The following data may be collected and linked to your identity:
- Financial Info
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Pegasus Realm LLC
- Size
- 36.4 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Frequent
Medical Treatment information
Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Plus Annual $49.99
- Plus Monthly $6.99
- Copyright
- © 2026 Pegasus Realm LLC