One Unified Inbox for HeyReach. Every reply answered in under 5 minutes.
HeyReach runs LinkedIn campaigns across many sender accounts with rotation and sequencing built in. Underfive takes it from there. Every LinkedIn reply from every sender and client lands in one Unified Inbox, where AI inbox agents write a human-like response, send it from the same LinkedIn profile, follow up, and book the meeting on your calendar.
- 50 free replies
- No credit card
- Webhook created for you
Reply via HeyReach 
Read & classified
Interested · drafted in 48s 
HeyReach gets the reply. Your Unified Inbox wins the meeting.
HeyReach already collects LinkedIn replies in its inbox. The expensive gap is the hours between a prospect replying and someone on your team finding it, reading it, and writing back. Underfive closes that gap with one inbox across every sender and client, and agents that answer in minutes.
Reply time, around the clock
Every reply to a HeyReach campaign gets a human-like response in under five minutes. Nights, weekends, and holidays included.
More likely to qualify the lead
Harvard Business Review found that firms contacting a lead within an hour were nearly seven times more likely to qualify it, meaning they reached a real decision maker, than firms that waited an hour longer (Oldroyd, McElheran and Elkington, HBR, March 2011). That window is the whole product.
API key. The webhook is created for you.
Paste your HeyReach API key into Underfive and Underfive creates the reply webhook in HeyReach through its API. No webhook screen to fill in, nothing in your campaigns changes.
Connected in three steps
One API key. Underfive creates the webhook. No changes to your campaigns.
Connect HeyReach with one API key
Copy your HeyReach API key and paste it into Underfive under Integrations. Underfive calls the HeyReach API and creates the reply webhook for you. From that moment, every LinkedIn reply in that HeyReach account flows into your Unified Inbox.
- Webhook created automatically through the HeyReach API
- Takes about a minute, no code
- Campaigns, sender rotation, and sequences are untouched
Choose your senders and teach your inbox agents how you sell
Pick which LinkedIn sender accounts the inbox agents should reply for. Train them per sender or once for the whole workspace. Upload your offer, FAQs, pricing, and objection handling, connect Google Calendar or Outlook, then decide which reply categories send automatically and which wait for a human.
- Sender-level scopes: agents reply only for the LinkedIn senders you select
- Knowledge base per sender or per workspace
- Auto-send or Require Approval, per category
Replies are answered, followed up, and booked
When a prospect replies on LinkedIn, HeyReach sends the conversation to your Unified Inbox. An inbox agent reads it, classifies it, writes a response in your voice, and sends it back through HeyReach as a DM from the same LinkedIn profile. Interested prospects get a meeting on your calendar.
- Sent from the LinkedIn profile that received the reply, so the conversation stays with the same person
- Smart follow-ups when a thread goes quiet
- Every conversation in one Unified Inbox across senders and clients
Unified Inbox- Meeting bookedJordan MeyerThursday at 10:30 works. Talk then.Meeting booked
-
Replied · autoEmily TranCan you send over a case study first?Replied · auto -
Follow-up · Apr 2Omar HaddadWe're mid-contract until Q2, circle back then?Follow-up · Apr 2 -
Needs approvalLena SchulzWho else at your company should I loop in?Needs approval
Already on HeyReach? You are five minutes away.
Sign up, paste the API key, pick your senders, and the first LinkedIn reply that lands in your HeyReach account gets handled. Nothing changes in your campaigns or sender setup.
What happens to each kind of reply
Your inbox agents classify every LinkedIn DM reply before they act. You decide which categories auto-send and which wait for a human.
Interested
Answers, proposes times, and books the meeting on your calendar.
Pricing question
Replies with the pricing guidance from your knowledge base and moves toward a call.
Product question
Answers from your FAQs and offer details, in your tone of voice.
Objection
Handles the objection using your playbook and keeps the thread alive.
Not right now
Acknowledges, then schedules a follow-up for the timeframe they gave.
Referral
Thanks them and continues the conversation with the person they named.
Not interested
Closes politely and stops the thread. No more follow-ups.
Uncategorized
Goes to the approval queue so a human decides. Nothing is sent blind.
Categories and their behaviour are yours to edit per workspace. Nothing is sent without a category you approved.
Pick the senders. One inbox for all of them.
HeyReach agencies run many LinkedIn senders for many clients. Underfive uses sender-level agent scopes, so you choose exactly which LinkedIn sender accounts the inbox agents reply for, give each one its own training or share one playbook, and see every client's replies in one view.
Sender-level scopes
Select the LinkedIn senders the inbox agents should act for. Senders you leave out are untouched, so a client who wants manual replies keeps them.
Train per sender or per workspace
Give each LinkedIn sender its own voice, offer, and calendar, or train the agent once at workspace level and apply it to every selected sender.
One workspace per client
Connect each client's HeyReach account to its own Underfive workspace with its own API key. Agents, knowledge, approvals, and Slack channel stay separate per client.
A workspace per client
Team members are unlimited on every plan and workspaces are unlimited on Agency, so adding a client or a sender never adds a per-seat fee on the reply side.
Two tools. One job each.
HeyReach owns LinkedIn automation, sender rotation, and sequencing. The Underfive Unified Inbox owns everything after the reply lands.
| Capability | HeyReach | Underfive |
|---|---|---|
| Multi-account LinkedIn automation with sender rotation | — | |
| Campaign sequencing, connection requests, lead lists | — | |
| Unified LinkedIn inbox per HeyReach account | ||
| One Unified Inbox across every sender, client, and tool | — | |
| Writes a human-like reply to each LinkedIn response | — | |
| Replies within 5 minutes, 24/7 | — | |
| Negotiates times and books the meeting | — | |
| Follows up when a thread goes quiet | — | |
| Approval queue with Slack notifications | — |
Watch the full setup
From a blank Underfive account to the first HeyReach reply handled, in one short recording.
HeyReach integration FAQ
Everything people ask before connecting.
Do I need to set up a webhook in HeyReach?
No. When you paste your HeyReach API key into Underfive, Underfive creates the reply webhook in your HeyReach account through the HeyReach API. There is nothing to copy or paste on the HeyReach side.
Where do I find my HeyReach API key?
In HeyReach, open Settings and look for the API key section. Each HeyReach account has its own key, so connect each client account to its own Underfive workspace if you run multiple clients.
Does Underfive reply from my LinkedIn profiles?
Yes. Replies are sent through HeyReach as LinkedIn DMs from the same LinkedIn profile that received the reply, so the prospect sees one continuous conversation with the same person.
Will this change my HeyReach campaigns?
No. Campaigns, sequences, sender rotation, and connection requests keep running exactly as they do today. Underfive only acts on replies.
What are sender-level scopes?
In Underfive you choose which of your HeyReach LinkedIn senders the inbox agents should reply for. You can train the agent separately for each sender or once for the whole workspace. Senders you do not select are left alone.
HeyReach already has a unified inbox. What does Underfive add?
The HeyReach inbox collects LinkedIn replies inside one HeyReach account. Underfive brings replies from every HeyReach account, every sender, and every other tool into one Unified Inbox, and its inbox agents actually write and send the response, follow up, and book the meeting.
Can I review replies before they go out?
Yes. Each reply category can be set to auto-send or require approval. Replies that need approval wait in your Underfive queue, and you can approve them from the app, from Slack, or through the Underfive MCP connector.
I run several clients on HeyReach. How does that work?
Create one Underfive workspace per client HeyReach account and connect each with its own API key. Select the senders for each, and train agents per sender or per workspace. Team members are unlimited on every plan, workspaces are unlimited on Agency, and the Unified Inbox shows every client in one place.
What does it cost?
Start with 50 free replies and no credit card. After that, plans are priced by agent credits. See the pricing page for current plans.
Stop leaving HeyReach replies unanswered.
Connect in under five minutes. Your first 50 replies are free, and nothing changes in your campaigns.
Not on HeyReach yet? Learn about HeyReach.