The Companies That Help Us
Subprocessors
Last updated June 18, 2026
To run Our Little Book, we rely on a small set of trusted companies, our subprocessors. Each one handles information only to provide its service to us, under its own data protections and a data-processing agreement. This page lists who they are, what they do, the information they handle, and where they process it. We keep it current as the service grows.
| Subprocessor | Purpose | Data categories | Region |
|---|---|---|---|
| Supabase | Account authentication, database, and file storage | Email address, sign-in credentials, the details you provide for a book (character names, descriptions, story ideas), and the finished books and artwork created for you | United States |
| Vercel | Website and application hosting | Requests to the site, including basic technical information such as device and browser type and IP address | United States (global edge network) |
| Railway | Hosting for the background worker that generates your book | The book-generation job in progress, including the details and reference images it draws from | United States |
| Anthropic | AI provider that writes the story text and helps quality-check the art | The character and story details you provide so your book can be written, and, during quality checks, the AI-generated page and character art | United States |
| xAI (Grok Imagine) | Primary AI provider that illustrates your book | Illustration prompts and the AI-generated character reference art, which depicts the people the book is about as illustrations (you do not upload photos) | United States |
| Google (Vertex AI / Gemini) | Backup AI provider that illustrates your book | Illustration prompts and the AI-generated character reference art, which depicts the people the book is about as illustrations (you do not upload photos) | United States |
| Resend | Delivery of account, security, and service emails | Email address and the contents of the messages we send you | United States |
| Stripe | Payment processing for purchases and memberships | Email address, purchase details, and payment information (card details are entered on Stripe and are never seen by us) | United States |
| Lulu | Printing and shipping of hardcover books | Shipping name, postal address, phone number, contact email, and the book file to be printed (only when you order a hardcover book) | United States |
| Apple (Push Notification service) | Delivery of push notifications, only if you use a mobile app and turn them on | A device notification token and the notification text, such as a note that your book is ready | United States |
| Google (Analytics and Tag Manager) | Website analytics, only after you accept analytics in our cookie banner | Website usage with identifiers removed from web addresses; no advertising or ad-personalization signals are ever enabled | United States |
Supabase
- Purpose
- Account authentication, database, and file storage
- Data categories
- Email address, sign-in credentials, the details you provide for a book (character names, descriptions, story ideas), and the finished books and artwork created for you
- Region
- United States
Vercel
- Purpose
- Website and application hosting
- Data categories
- Requests to the site, including basic technical information such as device and browser type and IP address
- Region
- United States (global edge network)
Railway
- Purpose
- Hosting for the background worker that generates your book
- Data categories
- The book-generation job in progress, including the details and reference images it draws from
- Region
- United States
Anthropic
- Purpose
- AI provider that writes the story text and helps quality-check the art
- Data categories
- The character and story details you provide so your book can be written, and, during quality checks, the AI-generated page and character art
- Region
- United States
xAI (Grok Imagine)
- Purpose
- Primary AI provider that illustrates your book
- Data categories
- Illustration prompts and the AI-generated character reference art, which depicts the people the book is about as illustrations (you do not upload photos)
- Region
- United States
Google (Vertex AI / Gemini)
- Purpose
- Backup AI provider that illustrates your book
- Data categories
- Illustration prompts and the AI-generated character reference art, which depicts the people the book is about as illustrations (you do not upload photos)
- Region
- United States
Resend
- Purpose
- Delivery of account, security, and service emails
- Data categories
- Email address and the contents of the messages we send you
- Region
- United States
Stripe
- Purpose
- Payment processing for purchases and memberships
- Data categories
- Email address, purchase details, and payment information (card details are entered on Stripe and are never seen by us)
- Region
- United States
Lulu
- Purpose
- Printing and shipping of hardcover books
- Data categories
- Shipping name, postal address, phone number, contact email, and the book file to be printed (only when you order a hardcover book)
- Region
- United States
Apple (Push Notification service)
- Purpose
- Delivery of push notifications, only if you use a mobile app and turn them on
- Data categories
- A device notification token and the notification text, such as a note that your book is ready
- Region
- United States
Google (Analytics and Tag Manager)
- Purpose
- Website analytics, only after you accept analytics in our cookie banner
- Data categories
- Website usage with identifiers removed from web addresses; no advertising or ad-personalization signals are ever enabled
- Region
- United States
Data-processing agreements
We put a data-processing agreement in place with each company above before it handles your information, and we choose established providers that hold recognized security and privacy certifications.
Changes to this list
As the service grows we may add or change subprocessors. When we do, we’ll update this page and the date at the top. This list is meant to stay consistent with the companies named in our Privacy Policy.
Getting in touch
If you have a question about how your information is handled, write to us at hello@ourlittlebook.com and we’ll be glad to help.