Account
Manage your subscription, your token, or sign out.
Not signed in
Paste the subscriber token from your welcome email, or view pricing and subscribe if you don't have one yet.
Create a free account or sign in with Google. Subscribers, use your subscription's email.
Lost your token?
Enter the email address on your subscription and we will send your access token to it. That is the address you subscribed with, which can differ from a billing email you changed later in Stripe.
Account
Upgrade
Pick a plan and your email is filled in at checkout. Paying upgrades this account, and Continue with Google then signs you in to the paid plan.
Your data
Download what Hammerstein stores for your free account: your email, your Google account link, the date you joined, and your current usage counts.
Delete account
Permanently erases your free account: your email address and Google account link. This cannot be undone.
Type DELETE to confirm:
Subscription
Cancel, update payment method, change billing email, or view invoices via Stripe's hosted customer portal.
Usage
Subscriber token
The same token unlocks every paid surface (wargamer, chat, kriegsspiel, matrix). Stored only in this browser. If you lose access on another device, paste it again from your welcome email.
Refer a friend
Surfaces unlocked
Monthly turn caps vary by plan. See hammerstein.ai/pricing/ for the current tier breakdown.
Privacy
By default your conversation content is never used for improvement work — manual review, prompt tuning, or similar. Toggle this on if you'd like to contribute.
Your data
Download a copy of everything Hammerstein has stored for your account: conversations, campaign memory, RPG campaigns, and account preferences. The file is JSON and does not include payment or Stripe billing data.
Delete account data
Permanently erases your Hammerstein-stored data: conversations, campaign memory, RPG campaigns, spend counters, and account preferences. This cannot be undone.
This does not cancel Stripe billing. Cancel first via Manage subscription above if you want charges to stop.
Type DELETE to confirm: