Harp vs OXYGEN
OXYGEN describes itself as a GTM operating system: CRM, tables, waterfall enrichment, sequences across email, LinkedIn, WhatsApp, X and phone, content scheduling and its own agents, reachable from a web app, a CLI or a hosted MCP server. Harp is narrower on purpose. It is the harness your own AI agent runs outbound through, built around two things: LinkedIn that runs from your own browser, and replies that get answered, not just drafted.
The short answer
If you want one broad, self-serve platform for data, CRM, many channels and content, with a free tier and plans from $49 a month, OXYGEN is built for that. If you care most about your LinkedIn account staying in your own Chrome on your own Mac, and about your agent answering replies and booking meetings within minutes, Harp is built for that.
Side by side
| Topic | Harp | OXYGEN |
|---|---|---|
| What it is | The MCP harness for pipeline generation: research memory, sequences, sending, replies and LinkedIn, driven by your agent | A GTM operating system: CRM, tables, enrichment, multichannel sequences, content scheduling and built-in agents |
| How LinkedIn connects | Your real Chrome on your Mac, in your own session, driven at the OS level like a person | A cloud connection through Unipile: you sign in through a hosted link with your login country, and actions run from the cloud |
| LinkedIn pace | Click navigation, human mouse and typing, per-action limits that vary day to day, a four-week warm-up and a right-person check before sending | Per-account limits spread across working hours, a ramp of about two weeks, half volume at weekends by default |
| Replies | The sequence stops; your agent is woken within minutes to answer email replies and book the meeting. LinkedIn replies wait for your yes in Slack | Unibox for every channel; the AI Sales Agent drafts replies into a review queue and a person approves each one |
| Agent access | MCP server that runs locally next to Claude Code, Claude Desktop or Cowork | Hosted MCP server with OAuth, plus a CLI; works from Claude, Codex, Cursor and ChatGPT |
| AI costs | Your own agent on your own plan; Harp sells no AI credits | AI runs on credits, or on your own model key with no OXYGEN fee |
| Data and CRM | No data sold; your agent brings accounts in with the tools you use and saves research with evidence | Built-in waterfall enrichment across many providers and a free CRM |
| Channels | Email and LinkedIn | Email, LinkedIn, WhatsApp, X and phone |
| Buying | Flat subscription after a short call; set up with you | Self-serve: a free tier, then credit plans from $49 to $1,999 a month; each connected LinkedIn account reserves $34 a month in credits |
Where your LinkedIn account lives
OXYGEN connects LinkedIn through Unipile, a cloud service: you sign in through a hosted link, choosing the country you normally log in from, and OXYGEN’s sends and reads run from there. That is what lets it work around the clock and across many accounts.
Harp never takes your LinkedIn session anywhere. It drives your real Chrome on your own Mac at the operating-system level, moving the mouse and typing like a person, with no extension and no code injected into LinkedIn’s pages. It navigates by clicking, and before it sends a message or invite it checks it is on the right person’s profile. The trade-off is honest: your Mac has to be on, inside the hours you set. No tool can guarantee LinkedIn will never restrict an account; Harp keeps activity at human volumes and patterns.
Replies answered, not queued
In OXYGEN, the AI Sales Agent drafts replies into a review queue, and a person approves each one before it goes out. Some teams want exactly that.
Harp is built for speed to the first answer. A reply stops the sequence at once and wakes your agent, which answers the email from the product facts you give it, offers times from the receiving mailbox’s calendar and books the meeting, within minutes during your working hours. Anything it cannot answer from those facts it hands to a person. LinkedIn replies always wait for your yes in Slack.
Broad platform or focused harness
OXYGEN’s pitch is to replace a stack of tools with one system, and it covers a lot of ground: data, CRM, channels from WhatsApp to X, content and its own agents. Harp does less on purpose. It assumes your agent and your existing tools are good at what they do, and gives the agent what outbound needs around it: memory with evidence, sequences, sending, reply handling and LinkedIn at human pace.
When OXYGEN is the better choice
- You want data, CRM, sequences and content in one self-serve platform.
- You want to start today on a free tier or a low monthly plan.
- You need WhatsApp, X or phone in your outreach.
- You want LinkedIn running around the clock, across several accounts, without a Mac.
- Your team works from ChatGPT; OXYGEN’s MCP server is hosted.
When Harp is the better choice
- Your LinkedIn account matters and you want it to stay in your own Chrome on your own Mac.
- You want email replies answered and meetings booked within minutes, not queued for approval.
- You want a right-person check before every LinkedIn message or invite.
- Your agent already does the thinking and you want a focused harness, not another platform.
Questions
How does OXYGEN connect to LinkedIn?
OXYGEN’s documentation describes connecting a LinkedIn account through a hosted sign-in link, with inbox sync from Unipile, a cloud LinkedIn connection service. Harp runs LinkedIn from your own Chrome on your Mac instead.
Does OXYGEN send AI replies automatically?
OXYGEN’s documentation says its AI Sales Agent drafts replies into a review queue and a person approves every one. Harp’s agent answers email replies itself within minutes during your working hours, and LinkedIn replies wait for your yes.
Can I use Harp from ChatGPT like OXYGEN?
Not today. Harp is set up with Claude: Claude Code, Claude Desktop or Cowork. If your team runs on a different agent, talk to us.
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