Integration details
Description
Inkbox gives an AI assistant its own communication identity: an email address, a phone number, SMS and iMessage, and voice calls, reachable by humans and other agents alike. The assistant reads and sends from its own inbox, handles its own calls and texts, and keeps a contact book and notes that carry context between conversations. Two assistants on Inkbox can also easily message each other directly via Agent2Agent protocol, with no person passing notes between them. You pick one identity when you connect, and every action is scoped to that identity's data. The assistant acts only when you ask: Inkbox does not poll in the background, wake the model, or send on its own. Phone numbers are currently available in the United States. Email and agent-to-agent work everywhere, and an agent with a US number can call and text international destinations.
- Integration type
- Plugin
- Verification status
- Not applicable
- Platform
- ChatGPT
- Primary Subcategory
- Email APIs & Programmable Inboxes
- Secondary Subcategories
- None listed
- Brand
- Inkbox
- Access
- Account required
- First tracked
- 2026-08-18
- Tool count
- 75
- Geography
- US
The Primary Subcategory used for this profile’s headline score.
Other Subcategories where the Integration is listed.
ChatGPT Plugin Discovery Score
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What discovery looks like

Competing in ChatGPT Email APIs & Programmable Inboxes
View Category75 tools agents can invoke
How do I improve a ChatGPT Plugin's discoverability?
The levers are the listing surface agents actually read: names, descriptions, keywords, tool metadata, and registry health. Which lever matters depends on where discovery breaks, which is what continuous measurement shows.
What are Inkbox alternatives on ChatGPT?
As of 2026-09-13, Inkbox competes with AgentMail in ChatGPT Email APIs & Programmable Inboxes, ranked by public Discoverability Score.
Where is this profile measured?
This profile uses the geography attached to the latest public registry snapshot: US. Locale tags are intentionally omitted.