7 Best LinkedIn Unibox Tools in 2026: Compared
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Start your free 7-day POC. Want the how-to first? Read 5 ways to manage LinkedIn and email replies in one inbox or the LinkedIn inbox management guide.
Why trust this list?
This list is written by the Master Inbox team and reviewed by our founder, Abdul Mukati. Every feature and price for the other six tools comes from that vendor's own pages, read on 28 October 2026, and the sources are listed at the bottom. Master Inbox is one of the seven options, and we say so up front. We state only what each vendor publishes, phrase limits as neutral facts, leave out ratings, and say so where a vendor's page does not state something. Each tool here is strong at the job it was built for.
Why teams look for a LinkedIn Unibox
LinkedIn automation tools send connection requests and messages. The replies then need a home. Teams usually compare Unibox options for one of three reasons.
Several sender accounts
A team that runs LinkedIn outreach from many sender accounts does not want to log in to each one. A LinkedIn Unibox lists conversations from all connected accounts in one view, so a teammate can reply without switching profiles.
Email and LinkedIn side by side
Most outbound runs on email and LinkedIn together. When a prospect answers on one channel, the rep wants the history from the other in the same thread. That is the idea behind multichannel outreach and the LinkedIn Inbox in Master Inbox.
Labels, CRM and speed
Interested replies should reach a person fast and land in the CRM. Teams look for automatic labels, webhooks and CRM sync around the inbox. Our Unibox glossary entry explains the term.
LinkedIn Unibox tools at a glance
| Tool | Best for | Pricing model (checked 28 Oct 2026) |
|---|---|---|
| 1. Master Inbox | LinkedIn and email replies from every tool in one inbox | By connected mailboxes and client workspaces, unlimited users, from $499 a month |
| 2. HeyReach | Multi-sender LinkedIn outreach for teams and agencies | Growth per sender, Agency and Unlimited flat monthly fees |
| 3. Expandi | LinkedIn outreach across several accounts with a Global Inbox | Per seat, $99 monthly or $79 annually |
| 4. Aimfox | Founders and agencies running LinkedIn campaigns from one or more profiles | Per seat, $49 a month |
| 5. Waalaxy | Individuals and small teams at a low per-user price | Per user, 19 to 69 euros a month, plus an Inbox add-on |
| 6. Lemlist | Multichannel outreach with an inbox on every plan | Per user, from $55 on the yearly option |
| 7. Smartlead | Cold email sending, with LinkedIn through integrations | Subscription by contacts and sends, from $39 a month |
1. Master Inbox
Master Inbox is the reply management platform for outbound teams and agencies: one unified inbox for every sequencer, LinkedIn tool and inbound form, with AI labeling and AI reply agents. LinkedIn replies and email replies land in the same inbox, threaded per prospect.
Key features
- LinkedIn Inbox: HeyReach, Expandi, Aimfox and native seats in one inbox, threaded next to email per prospect, AI labeled and synced to the CRM.
- Unibox: one AI-labeled inbox for Smartlead, Instantly, EmailBison, Reply.io, Lemlist, HeyReach, Expandi, Aimfox and more. It reads the mailboxes themselves, so it also threads forwards, CC replies and new-address replies.
- AI labeling: every email and LinkedIn reply labeled by intent as it lands, with thirteen default labels or your own taxonomy, on your own OpenAI, Anthropic or OpenRouter key.
- Workflows: label-triggered actions such as Slack cards, HubSpot sync, stopping the sequence on a booked meeting and webhooks.
- Client workspaces and Reply Agents: one workspace per client with scoped logins, and agents that answer replies and book meetings on your real calendar.
Pricing
Master Inbox is never priced per seat. Plans scale with connected mailboxes and client workspaces, and every plan includes unlimited users. A native LinkedIn seat is $15 a month per account. Full details are on the pricing page.
| Plan | Price | Built for |
|---|---|---|
| Reply Agent | From $499 per month | Reply agents that answer, follow up and book meetings |
| Agency | $599 per month | Agencies, with up to 3,000 mailboxes and 15 client workspaces |
| Team | $799 per month | Sales teams, with up to 2,000 mailboxes |
Larger plans are listed on the pricing page. Every plan starts with a free 7-day POC, and onboarding is done with you.
Pros
- LinkedIn and email replies share one queue, one set of labels and one thread per prospect.
- Unlimited users on every plan, so adding a teammate does not change the bill.
- Master Inbox internal data shows roughly 12% more replies captured than a sequencer reports.
- EU hosting in Finland and Germany, GDPR-ready, and white-glove onboarding.
Best for
Outbound sales teams and lead generation agencies that run LinkedIn and email together and want every reply in one place. See Master Inbox for outbound teams and for agencies.
Works alongside
Master Inbox works alongside your LinkedIn tool. Keep HeyReach or Aimfox for running campaigns, connect Expandi if you use it, and add Master Inbox for the replies. It also connects your email sequencer, HubSpot as your CRM and Slack for alerts.
2. HeyReach
HeyReach is a LinkedIn outreach automation platform that runs campaigns from multiple connected LinkedIn sender accounts and collects replies in a Unibox. It is an excellent LinkedIn sending tool, and Master Inbox customers who use it keep it for that. See HeyReach and Master Inbox.
Key features
- One Unibox lists conversations from all connected LinkedIn senders, with filters for sender, campaign, tag, auto-tag and message type. Standard LinkedIn, Sales Navigator and Recruiter messages are covered.
- Bulk actions let you filter, select several leads, then tag, archive or add them to a list or campaign at once.
- Auto-Tag classifies replies as Interested, Generic or Not Interested and can trigger webhooks. An API with 12 documented webhook events and an MCP connector are available.
Pricing
Per HeyReach's pricing page, checked 28 October 2026, Growth is $79 per LinkedIn sender per month billed monthly. Agency is $999 per month and Unlimited is $2,999 per month, both flat fees, with Unlimited capped at 300 senders under the fair-use policy. Quarterly and yearly rates are also shown, so confirm in checkout.
Pros
- Teammates can reply to leads from a colleague's LinkedIn account without owning it.
- No per-user charge, and a native HubSpot integration.
Cons
- HeyReach is LinkedIn-first. The pages we read show no cold email mailbox inbox of its own, and email follow-up runs through its Instantly and Smartlead integrations.
- Auto-tags cannot be edited manually, and replies outside campaigns are not classified.
- Per the pricing page FAQ, the Agency and Unlimited plans require bringing your own proxies.
Best for
Sales teams and agencies that run LinkedIn outreach from several sender accounts and want those replies in one place.
3. Expandi
Expandi is a cloud-based LinkedIn outreach automation tool with a built-in Inbox and a workspace-wide Global Inbox for replies across connected LinkedIn accounts.
Key features
- The Inbox shows LinkedIn and Sales Navigator messages in one conversation window. Campaign emails for existing leads appear in the same thread, labeled Email.
- The Global Inbox shows all LinkedIn accounts in a workspace on one screen, with role-based access and filters for status, campaign, tags and interest rating.
- AI Sentiment Analysis rates replies Interested, Maybe interested or Not interested. HubSpot, Salesforce and Pipedrive connect natively, and 25 webhook event types are documented.
Pricing
Per Expandi's pricing page, checked 28 October 2026, Business is $99 per month billed monthly or $79 per month billed annually. Expandi's comparison page describes this as per seat, one LinkedIn account. Agency is custom, and a 7-day trial is offered.
Pros
- Snooze, scheduled send, notes and archive controls for each conversation.
- An MCP connection that lets an AI assistant read inbox conversations and draft replies for approval.
Cons
- Priced per LinkedIn account.
- Campaign emails are view-only in the Inbox, and replies are sent from the mailbox.
- Sentiment Analysis can be enabled in 5 active campaigns per LinkedIn account at a time, and the AI reply draft is English only.
Best for
Sales teams and agencies that run LinkedIn outreach across several accounts and want one inbox with CRM syncing and webhooks around them.
Running LinkedIn and email together? Start your free 7-day POC and see both channels threaded in Master Inbox.
4. Aimfox
Aimfox is a LinkedIn outreach automation platform organized into workspaces, where each LinkedIn account that runs campaigns uses a paid seat. Its Unibox shows conversations from every connected LinkedIn account in one place. See Aimfox and Master Inbox.
Key features
- A unified inbox over all connected LinkedIn accounts in a workspace, filterable by account, with labels and notes that stay in sync with the Leads page.
- Campaigns can auto-apply chosen labels to new connections and replies.
- Integrations include Slack, HubSpot, Pipedrive, Zapier, Make, n8n, Clay, Instantly, Smartlead, EmailBison and PlusVibe, plus webhooks, an API and an MCP server.
Pricing
Per Aimfox's pricing page, checked 28 October 2026, an Outreach seat is $49 per month, where one seat is one LinkedIn account running campaigns. Outreach avatar is $387 per month for 3 rented LinkedIn profiles. Agency is from $499 per month flat for 20 seats, plus $20 per additional seat. The Outreach seat has a 14-day trial with no credit card.
Pros
- Unlimited team members and unlimited connected LinkedIn accounts per workspace.
- A published per-seat price of $49 a month.
Cons
- No cold-email mailbox inbox was found. Email tools connect through integrations.
- No AI feature inside the Unibox, such as reply drafting or sentiment classification, was found on the pages we read.
- Per the help center, replied conversations can be exported only one at a time from the Inbox.
Best for
Founders, sales teams and agencies that run LinkedIn campaigns from one or more profiles and want a shared reply inbox.
5. Waalaxy
Waalaxy is a prospecting automation tool for LinkedIn and, on higher plans, cold email, priced per user per month. Its LinkedIn Inbox is a separate optional add-on that recreates LinkedIn messaging with saved replies, tags, reminders and scheduled messages.
Key features
- Saved reply templates, scheduled messages, follow-up reminders and tags, with filters for message status, tags and who sent the last message.
- Tags sync between the Inbox and the prospect records and lists used in campaigns.
- Native two-way HubSpot and Pipedrive integrations, a Zapier connector, and Make and n8n modules on the Advanced plan.
Pricing
Per Waalaxy's pricing page, checked 28 October 2026, Pro is 19 euros, Advanced is 49 euros and Business is 69 euros per user per month. The LinkedIn Inbox is an optional add-on at 20 euros per month. Enterprise is custom for teams of 5 or more seats. Each paid plan lists a 14-day trial.
Pros
- A low published entry price.
- Multichannel sequences with LinkedIn plus cold email on the Business plan.
Cons
- The Inbox is a paid add-on, and the Inbox guide says many filters are still in development.
- The Inbox guide states that sharing Inbox access with other team members is not available yet.
- Cold email sequences are listed on the Business plan only.
Best for
Individuals, founders and small sales teams that want LinkedIn prospecting automation at a low per-user price.
6. Lemlist
Lemlist is an AI-powered sales engagement platform for finding leads and running campaigns across email, LinkedIn, calls, WhatsApp and SMS. See also Lemlist and Master Inbox.
Key features
- The lemlist Inbox is available on all plans, with views for Unread, Favorites, Snoozed and Archived and filters by contact, company, campaign and teammate.
- LinkedIn replies can be handled in the Unified Inbox, and the composer can send as email, LinkedIn, WhatsApp or SMS.
- Two-way HubSpot and Salesforce sync, Slack notifications and an API with webhooks.
Pricing
Per lemlist's pricing page, checked 28 October 2026, plans are per user per month. Email is $69, or $55 on the yearly option. Multichannel, which adds LinkedIn automation, is $109, or $87 on the yearly option. Enterprise is custom, and the trial is 14 days.
Pros
- Email, LinkedIn, WhatsApp, SMS and calls in one workflow.
- Replies from different sending addresses for the same lead appear in one thread.
Cons
- LinkedIn automation is included from the Multichannel plan upward.
- Per lemlist's help article, the Inbox shows conversations that were started in lemlist, plus campaign events and tracked activity.
Best for
Sales reps, RevOps teams, founders and agencies running multichannel outbound from a single platform.
7. Smartlead
Smartlead is a cold email platform with sequencing, mailbox rotation and warmup, and an inbox it calls the Master Inbox. Smartlead is an excellent sending tool, and Master Inbox customers who use it keep it for sending. LinkedIn comes in through integrations. See Smartlead Master Inbox alternatives.
Key features
- Smartlead's blog says LinkedIn steps can be added through its HeyReach and Aimfox integrations. Its integrations page also lists GetSales.io, Waalaxy and Expandi as LinkedIn tools.
- The Master Inbox shows replies to Smartlead campaigns, with tags, filters, team assignment and Slack alerts.
- Unlimited email accounts on every plan, native CRM integrations and a public API with webhooks.
Pricing
Per Smartlead's pricing page, checked 28 October 2026, plans are Base at $39, Pro at $94, Unlimited Smart at $174 and Unlimited Prime at $379 per month on monthly billing. Plans scale by contacts and monthly email sends.
Pros
- Email sending at volume, with mailbox rotation and warmup.
- Client workspaces and white-labeling for agencies.
Cons
- LinkedIn is not part of the Master Inbox in the documentation reviewed.
- LinkedIn steps are added through partner integrations such as HeyReach and Aimfox.
Best for
Teams that send cold email from Smartlead and add LinkedIn through HeyReach or Aimfox. Master Inbox connects to all of them, as covered in Master Inbox vs Smartlead.
How to choose a LinkedIn Unibox
Start with the channels you run, then check how the bill scales.
- LinkedIn and email replies in one queue: choose Master Inbox. It threads both channels per prospect and labels every reply. Compare options on our compare page.
- LinkedIn only, several senders: HeyReach, Expandi and Aimfox each include a multi-account inbox with their automation.
- A low per-user entry price: Waalaxy publishes plans from 19 euros per user per month.
- Email and LinkedIn in one sending platform: Lemlist, or Smartlead with a LinkedIn partner tool.
Then check the pricing unit. HeyReach Growth, Expandi and Aimfox follow LinkedIn accounts, Waalaxy and Lemlist follow users, and Smartlead follows contacts and sends. Master Inbox follows connected mailboxes and client workspaces with unlimited users. Also read our guides to the best unified inbox for cold email and the unified inbox guide.
Start your free 7-day POC and try Master Inbox next to your current setup.
Frequently asked questions
What is a LinkedIn Unibox?
It is one inbox that lists the LinkedIn conversations from all your connected sender accounts. Tools such as HeyReach, Expandi and Aimfox include one, and Master Inbox adds email replies to the same view.
What is the best LinkedIn Unibox for teams that also use email?
Master Inbox is built for that job. It threads LinkedIn and email replies per prospect, labels each by intent and syncs to the CRM, with unlimited users on every plan.
Do I need to stop using HeyReach, Expandi or Aimfox?
No. Master Inbox connects to all three. Teams keep them for running LinkedIn campaigns and use Master Inbox to work the replies next to email.
Can Smartlead show LinkedIn replies?
Smartlead's blog says LinkedIn steps can be added through its HeyReach and Aimfox integrations. LinkedIn is not part of its Master Inbox in the documentation we reviewed.
Which of these tools are priced per seat?
Expandi and Aimfox price per seat, HeyReach Growth prices per LinkedIn sender, and Waalaxy and Lemlist price per user. Master Inbox is priced on connected mailboxes and client workspaces, with unlimited users.
How do I try Master Inbox?
Every plan starts with a free 7-day POC, and onboarding is done with you. You can start from the pricing page.
Sources
Prices and features checked on 28 October 2026 from each vendor's own pages:
- HeyReach pricing and HeyReach Unibox overview
- Expandi pricing and Expandi Global Inbox
- Aimfox pricing and Aimfox Unibox
- Waalaxy pricing and Waalaxy LinkedIn messaging
- lemlist pricing and lemlist Inbox help article
- Smartlead pricing and Smartlead integrations
Master Inbox pricing comes from our pricing page. HeyReach, Expandi, Aimfox, Waalaxy, Lemlist and Smartlead are each a trademark of its owner. Master Inbox is an independent product and is not affiliated with HeyReach, Expandi, Aimfox, Waalaxy, Lemlist or Smartlead.