LinkupAPI vs Maison Cartouche

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

LinkupAPI compared with Maison Cartouche
Detail	LinkupAPI	Maison Cartouche
What it does	Connect your users' LinkedIn, email, WhatsApp and iMessage accounts to send messages at scale and get every reply back through one API	API for sending handwritten letters through AI agents and assistants
Stage	Not given	Not given
Founded	Not given	Not given
Based in	FR	DE
Pricing model	Paid	Not given
Pricing	$55/month for up to 10 connected accounts, $5.50 per account for 11–50 accounts, $5.00 per account for 51–200 accounts, $4.50 per account for 201–640 accounts, $3,000/month flat for unlimited accounts. Dedicated iMessage lines $199/month per line. Unlimited usage on all channels; no per-call fees.	Not given
Key features	LinkedIn messaging, invitations, Sales Navigator InMails, posts and engagement Email outreach from Gmail, Outlook and SMTP with email finder and verification WhatsApp messaging with text, files and voice notes Dedicated iMessage lines with US and UK numbers Real-time webhook delivery of replies and bounces MCP server for Claude, ChatGPT and Gemini integration Device signature binding for account security No-code integration via Make, n8n and Zapier Account health monitoring with real-time alerts	Agent policy configuration with send limits and approval settings Relationship management with contact details restricted from API Moment tracking for birthdays and anniversaries Letter quote and pricing with customizable upgrades Real-time send tracking with multiple status states Address request generation with privacy protection Webhook event system with signature verification OAuth support for custom connectors like Claude
What makes it different	Unified API for four channels with the same request format across LinkedIn, email, WhatsApp and iMessage Account safety prioritized with dedicated infrastructure and real-time monitoring rather than blind limits Price capped at $3,000/month regardless of scale after 640 connected accounts GDPR and CCPA compliant with EU-hosted data and Google-verified security	Same API primitives used in the app itself Hands-on compliance with frequency limits and approval workflows Model Context Protocol integration for AI assistants Hosted MCP server with no installation required
Community votes	0	0
DR (Domain Rating by Ahrefs)	42 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	4	0
Citation Flow (Majestic)	31	0
Referring domains (Majestic)	77	0

4 details filled in for both companies.

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