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The Masterinbox alternative: Master Inbox, beyond Smartlead's inbox

Connect hundreds of mailboxes across email and LinkedIn. Built for those serious about sales and lead gen!
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Master Inbox app screenshot
Once we embedded and built out the Master Inbox flow, everything changed. And now clients aren't complaining, they're not churning, and they're actually able to manage all the leads that we get them at a high pace.
nick abraham leadbird
Nick A., LeadBird

Sales teams and agencies like yours choose Master Inbox because they care about better experiences and outcomes for their clients, and their teams.

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Master Inbox app screenshot
Master Inbox app screenshot
Master Inbox app screenshot
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Master Inbox app screenshot
Master Inbox app screenshot
Master Inbox app screenshot
Customer logo
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Master Inbox app screenshot
Master Inbox app screenshot
Master Inbox app screenshot
Customer logo
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Master Inbox app screenshot
Master Inbox app screenshot
Master Inbox app screenshot
Customer logo
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Master Inbox app screenshot
Master Inbox app screenshot
Master Inbox app screenshot
Customer logo
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Master Inbox app screenshot
Master Inbox app screenshot
Master Inbox app screenshot

Quick comparision guide

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FeatureS

Master Inbox
Other Tools
Never Miss a linkedin and Email reply
Included
Not included
AI Reply Agent
Included
Not included
Automated workflows for replies
Included
Not included
Linkedin Integration
Included
Not included
Auto draft replies
Included
Not included
Native EmailBison, Smartlead and Instantly Integration
Included
Not included
Native Hubspot Integration
Included
Not included
Quick Reply Snippets
Included
Not included
Custom views and robust filters
Included
Not included
Embedded Inbox Experiance
Included
Not included
Starting Price
$299
$99-299+
Never Miss a linkedin and Email reply
Master Inbox
Included
Master Inbox app screenshot
Not included
AI Reply Agent
Master Inbox
Included
Master Inbox app screenshot
Not included
Automated workflows for replies
Master Inbox
Included
Master Inbox app screenshot
Not included
Linkedin Integration
Master Inbox
Included
Master Inbox app screenshot
Not included
Auto draft replies
Master Inbox
Included
Master Inbox app screenshot
Not included
Native EmailBison, Smartlead and Instantly Integration
Master Inbox
Included
Master Inbox app screenshot
Not included
Native Hubspot Integration
Master Inbox
Included
Master Inbox app screenshot
Not included
Quick Reply Snippets
Master Inbox
Included
Master Inbox app screenshot
Not included
Custom views and robust filters
Master Inbox
Included
Master Inbox app screenshot
Not included
Embedded Inbox Experiance
Master Inbox
Included
Master Inbox app screenshot
Not included
Starting Price
Master Inbox
Included
Master Inbox app screenshot
Not included

Trusted by the top lead gen agencies and sales teams

Companies worldwide, from startups to the biggest lead gen agencies, have switched to Master Inbox for its reliability, ease of use and focus on privacy. Our software is a Hothawk alternative that combines more value and better results.
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Master Inbox app screenshot
That's why I use Masterinbox.com. Every reply, every forward, every CC - email and LinkedIn in one place. Stop losing deals.
Master Inbox costs less than one churned client.
can timagur
Can T., Founder at Allbound OS
Master Inbox app screenshot
Replying to 100+ positive replies is a full time job in itself but Masterinbox.com makes the job more simple and enjoyable. They have agents to draft/send replies, custom AI labelling and also sub sequences. 
naufal
Naufal N., Head of GTM Engineering @ understory
trudial
Felipe Soza
Pay only when a meeting is attended
So you’re an Ops leader who thinks Masterinbox.com is “a waste of money” because

“that’s what SDRs are for!!! They should read the inbox and tell me how campaigns are trending on top of making sure all replies are handled”

If that’s your model, here’s the uncomfortable truth: you’re flying blind on outbound.

[Master Inbox] gives you a clean, real-time read of every reply across every campaign and channel, so you can instantly see what’s working, what’s slipping, and where you’re leaving money on the table.

Clarity in → better decisions out.
Alex Fine
Alex Fine
Co-Founder at Understory | Investor | Top Clay.com Enterprise Partner
To give the client a cleaner feel, we're piping all responses across all channels through Masterinbox.com to give this unified view with AI sentiment analysis.

We're working closely with the company's CMO, RevOps department, and sales team to make sure that they have a very clear set of SOPs on how to respond to each reply in real-time.
understorry masterinbox

FAQs

Have a question? We’re here to help.

Sequencers often miss replies or lose thread context. Master Inbox consolidates every reply email + LinkedIn into a single “Master Thread,” so no deal opportunity slips away.

With AI auto-labeling (Lead, Demo, Objection, Interested etc) and reminders, reps instantly see priority replies, improving speed to lead and conversion rates.

Master Inbox is the only solution that gives you master threads which is a complete context window on a prospects conversation journey with you across multiple campaigns and subjects lines, it all lives in one view!

You can run campaigns on Smartlead or Bison, Instantly, HeyReach, Expandi or Aimfox, all replies show up in one centralized master inbox for your clients! Manage multiple clients using workspaces, control access using member controls and show only positive replies, or route specific ones to client's mailbox of choice.

Master Inbox pushes replies, thread context, and labels into HubSpot using our integration, we support a deeper attribution based integration through our partnership with OutboundSync, which also supports Salesforce!

Yes. Master Inbox supports both Email Bison and HeyReach simultaneously, allowing you to manage email and LinkedIn replies in one unified workspace.

Yes. You can filter by channel and create custom views to manage email and LinkedIn conversations separately while keeping them in one system.

Master Inbox displays new replies in real time inside the unified workspace and can trigger instant Slack notifications for important or high-intent responses.

Yes. AI labeling and manual labels can be applied consistently across both email and LinkedIn conversations.

Yes. Reply Agents can operate across selected channels, allowing automated or draft responses for both email and LinkedIn replies.

Yes. Master Inbox continuously syncs replies from connected Email Bison and HeyReach accounts and displays them instantly as they arrive.

Agencies using Master Inbox avoid lost leads, respond faster, and close more deals, one client credited us with helping close $260k+ in revenue by capturing replies they’d otherwise miss.

Still have questions?

Can’t find the answer you’re looking for? Please get in touch.
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