ReplyPen

Enables AI assistants to manage cold-email infrastructure through natural language, covering domain and mailbox provisioning, DNS setup, email warming, inbox and reply triage, exports, pre-warmed domain purchases, and webhooks. Supports hosted OAuth or local stdio installs with scoped read, write, and purchase permissions, plus two-step confirmation for anything that charges a card.

Enables agents to run support workflows across Gmail, Linear, Stripe, Slack, Notion and other apps — turning support email into tracked bugs with drafted replies, handling refunds end to end, and replying in-thread once issues are fixed.

Enables an AI assistant to run tasks on a hosted cloud desktop that belongs to the user, with a browser that stays signed in to their accounts, its own email address, and its own files, so it can fill forms, download and edit documents, and carry out long jobs that outlast a chat reply, returning answers with screenshots and recordings. It also exposes tools for checking current activity, task history, sent mail, interrupting a run, and saving or recalling notes, reached over OAuth-authenticated Streamable HTTP or a stdio bridge.

Enables AI agents to draft and send customer-support email replies, access brand knowledge, list mailboxes, and check credit balance via the RespondThat API.