How do their growth rates compare?

LinkupAPI has a month-over-month growth rate of +7.1%; Respond.io has -8.7%.

How does pricing compare?

LinkupAPI: Paid. LinkupAPI is a paid, credit-based API product. The site advertises a free trial with API keys and usage metered in credits (for example, a send action consuming credits). Exact plan tiers and per-credit pricing are not published on the homepage, so check the pricing page or sales for current numbers. Respond.io: Freemium. Freemium with a free trial. Paid tiers scale by users and monthly active contacts, and WhatsApp messaging fees are billed separately by the channel provider.

What are alternatives to LinkupAPI and Respond.io?

Other tools in related categories include Intercom, Gorgias, Crisp, Exa, AiSensy.

LinkupAPI vs Respond.io — Traffic (37.35K vs 1.61M), Pricing & Verdict

Open AI Tools

LinkupAPI vs Respond.io — Traffic (37.35K vs 1.61M), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	LinkupAPI	Respond.io
Official Domain	linkupapi.com	respond.io
Pricing Model	Paid	Freemium
Monthly Visits	37.35K (37,347)	1.61M (1,606,802)
MoM Traffic Delta	+2.46K (+7.1%)	-152.34K (-8.7%)
Primary Market & Share	🇳🇱 Netherlands (25.6%)	🇲🇾 Malaysia (17.4%)
Direct Visits / mo	7.87K	1.24M
User Rating	4.3	4.5
Supported Platforms	Website	Website

LinkupAPI

One outreach API to reach prospects on LinkedIn, email, WhatsApp and iMessage

One API for four channels

Send on LinkedIn, email, WhatsApp and iMessage with the same request format, and receive all replies on a single webhook.

Prospect and company data

Search people, pull full profiles, company details, job postings and funding rounds as JSON for your product or agent.

Mail API

Verify, find and enrich professional email addresses at scale, with real-time deliverability checks.

MCP server

Run searches, messages and reply reads from Claude, ChatGPT, Cursor or any MCP-compatible client.

Strengths & Pros

+Single API covering search, messaging, data enrichment and replies reduces vendor sprawl
+Strong channel breadth, including iMessage and WhatsApp alongside LinkedIn and email
+MCP server enables direct use from mainstream LLM clients
+Published performance and compliance posture (99.9% uptime, zero-storage, GDPR/CCPA)