Work
Product design lead · Remote
Prefers concise briefs
Timezone: Tokyo (GMT+9) Save your context once. The CardGo Chrome extension brings it to any AI chat — ChatGPT, Claude, Gemini, Perplexity, Grok, and more.
Your cards, at a glance
Encrypted at rest · Nothing shared until you attachProduct design lead · Remote
Prefers concise briefs
Timezone: Tokyo (GMT+9) Training for a half marathon
Vegetarian
Knee-friendly plans only
Planning life with two little ones
Weekend ideas
Budget-conscious picks
Encrypted at rest · Nothing shared until you attach
Works with
How to use CardGo
Install the Chrome extension, create a card, and attach it when you chat with AI.
Add CardGo to Chrome. Your cards will be ready beside the AI chats you use.
Save the context you want to reuse, from your role and goals to your preferences.
Choose the card you need in ChatGPT, Claude, Gemini, Perplexity, Grok, or another supported AI.
Coming soon
A dedicated desktop app for your cards and context.
A mobile keyboard for Android and iOS that brings your cards into any app.
Pick an everyday scenario and watch the same question answered twice—once without your card, once with it.
Your card — a few lines about you
Your question
A recorded example. Nothing leaves your browser—pick a scenario and watch the same question answered twice.
How it works
Profile, Now, Goals, Guidance, Memory, Timeline, Skills. Fill in what’s useful, skip the rest—empty sections save nothing. Pick one below to see what goes in it.
What is this card about?
Who or what this card is about. The things you would say first if someone asked, and would still be true next quarter.
Stable — changes in months, not days
Profile
New in CardGo Keeping a profile current is work, and work is why profiles go stale. So CardGo drafts the cards, surfaces the right one as you type, and files what you say back where it belongs.
Live now
One paragraph in — a named set out, already sorted into sections. You keep the ones that are right.
I lead product design at a startup in Tokyo, I’m training for a half marathon, and I have two kids under five.
Suggestions and Capture read only your own draft, and read it on your device — a small model in your browser, not a server. CardGo never reads the conversation, and nothing is attached, saved, or changed until you tap.
Why CardGo
Choose what each chat knows
Attach only the card a conversation needs. Nothing else is shared.
Switch AIs without starting over One card works in ChatGPT, Claude, Gemini, Perplexity, and Grok.
Encrypted end-to-end Cards are locked on your device with a key we never receive. We store ciphertext.
Filter sensitive details before sharing
Review the snapshot before you attach a card. Sensitive values are filtered on your device, so you can see exactly what the AI will receive.
Share one card—not your profile
Send a read-only card when it helps. You decide exactly what goes with it.
Your cards are sealed on your device with a key we never receive. What reaches CardGo is ciphertext — we can sync it, count it, and delete it, but we cannot read it.
What you write
Work
Product design lead · Timezone: Tokyo (GMT+9) What our servers store
An opaque block of ciphertext.Ciphertext · 412 bytes · rev 7 — and nothing else
Your key is born on your device
The vault key is generated in your browser and never sent to CardGo. No copy, no escrow, no reset.
AES-256-GCM, a key per card Every card gets its own content key, sealed with the platform’s audited crypto before it is uploaded.
Our servers hold ciphertext
We sync opaque blobs, sizes, and timestamps. Nobody at CardGo can read a card — there is no key to read it with.
A recovery phrase only you hold
Setup shows a 15-word phrase once and asks you to confirm it. We never store it, so only you can restore a vault.
Encryption protects your cards from us — it cannot protect what you deliberately send to an AI provider. Once you attach a card, that context is governed by that provider’s terms. Read the full privacy policy.
Early access
Install the extension, build your first context card, and bring it to your next AI conversation.
Free early access · No credit card