companion.ink | AI e-reader · House #36,505

What it is

Calls itself “AI chat interface”.

• Calls itself: AI chat interface

“…companion.ink – Use ChatGPT & Claude on Your Kindle | AI Chat for E-Readers”

“A lightweight AI chat interface built for e-readers”

Where it puts itself

Rules out “store your chats”.

• Says it will not: store your chats

“No, we don't store your chats.”

What it costs

Monthly subscription. No free plan. Prices quoted: $5 / mo.

• Monthly: yes
• Free plan: no
• Price: $5 / mo

“$5 / mo”

“Pricing companion.ink $5 / mo”

Who it sells to

Sells to consumers.

• Sells to: consumers

“Use ChatGPT & Claude on Your Kindle”

How it runs

A web app. Runs locally and works offline. AI is the core of the product. Built with Google Analytics and Stripe.

• Kind: web
• Runs where: on the device, offline
• AI role: core to the product
• Analytics: Google Analytics
• Payments: Stripe

“…companion.ink brings AI chat directly to your Kindle through its built-in web browser”

“All chats are stored on your device.”

What it works with

Runs inside Kindle. Names ChatGPT, Claude and 2 more on its pages.

• Runs inside: Kindle
• Names: ChatGPT · Claude · GPT-4o · +1

“Kindle doesn't have a native ChatGPT or Claude app”

“We support GPT-5, GPT-4o, Claude Opus 4.6, Claude Sonnet 4.6, and more”

What it offers as proof

Live, no waitlist. Instant signup. Publishes a blog.

• Instant signup: yes

“Sign me up”

“Blog -> https://www.companion.ink/blog”