
Mailflow.sh
Stackmail is a webmail service whereby you can log in to your emails from any browser at any time!

Unipile
Reach MCP
Unipile LinkedIn API
Linked API
Phantombuster
Expandi.io
Waalaxy
The outreach API for your AI agents. Reach your prospects on LinkedIn, Email and WhatsApp through a single powerful API, built for AI agents and software.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | stackmail.com | linkupapi.com |
| Pricing | — | |
| Company | — | Startup from France |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of StackMail yet.
LinkupAPI is the outreach API for AI agents and software. Connect your users' LinkedIn, Gmail, Outlook and WhatsApp accounts, then send connection requests, messages, InMails, emails and WhatsApp messages from your product or agent, and get every reply back through real-time webhooks. What you...
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing StackMail and LinkupAPI.
LinkupAPI's answer:
LinkupAPI is built for AI agents first. One API and an MCP server let Claude, ChatGPT, Gemini or Cursor run LinkedIn, email and WhatsApp outreach directly, across all of a team's accounts, and get every reply back in real time. It is also the only unified outreach API that caps the bill: per-account pricing with unlimited usage, and a flat $3,000 a month for unlimited accounts.
LinkupAPI's answer:
Compared with Unipile and other per-account APIs, LinkupAPI charges the same per connected account up to a few hundred accounts ($55 for 10, then $5.50 to $4.50), but caps the bill at $3,000 a month for unlimited accounts, so it becomes cheaper from about 640 accounts. Compared with LinkedIn automation tools like PhantomBuster, Expandi or Waalaxy, it is an API: your product or AI agent decides who to contact, on which channel and when, instead of running fixed templates. Every account gets a dedicated IP, hosted login and account health alerts.
LinkupAPI's answer:
SaaS companies and AI-agent builders that want to add LinkedIn, email and WhatsApp outreach to their product, GTM and sales teams running multichannel outreach from Claude or other AI agents across many accounts, recruiting platforms (ATS) that source and contact candidates, and agencies managing outreach for many clients.
Share your experience with using StackMail and LinkupAPI. For example, how are they different and which one is better?
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