Knock
Message users across channels
- Category
- Marketing
- Primary Subcategory
- Email & SMS Lifecycle Marketing Automation
Integration details
Description
Knock is agent-first customer engagement infrastructure for your product, marketing, and transactional messaging. One platform to manage all your messaging across email, SMS, push, chat, and in-app. Inspect workflows and manage notifications, directly in ChatGPT and Codex.
- Integration type
- Plugin
- Verification status
- Not applicable
- Platform
- ChatGPT
- Primary Subcategory
- Email & SMS Lifecycle Marketing Automation
- Secondary Subcategories
- None listed
- Brand
- Knock
- Access
- Account required
- First tracked
- 2026-09-03
- Tool count
- 24
- Geography
- US
The Primary Subcategory used for this profile’s headline score.
Other Subcategories where the Integration is listed.
ChatGPT Plugin Discovery Score
ChatGPT Plugin discovery is coming soon
ChatGPT can surface a Plugin when it matches a user's request.Your Plugin Discovery Score measures how often yours appears.
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What discovery looks like

Competing in ChatGPT Email & SMS Lifecycle Marketing Automation
View Category24 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 Knock alternatives on ChatGPT?
As of 2026-09-12, Knock competes with ActiveCampaign, Aivie, AWeber, Bizgo, Brevo, Conversion, Customer.io, Flodesk, Intuit Mailchimp, Kanal, Klaviyo, L Message(エルメ), Life Analytics Mail, Loops, magnews, MailerLite, Mailrith, MailSenpai, Nitrosend - AI Native Email, Notifly, Omnisend, OneSignal, Resend, SAMWAD, Sent, Spoki, Systeme.io, Textmagic, VerticalResponse in ChatGPT Email & SMS Lifecycle Marketing Automation, 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.