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Every reply. Every tool. One inbox

Helping Sales Teams and Agencies Never Miss a Reply

Your current tools are sending at scale but they’re missing replies. Master Inbox catches what they don’t, so you never lose a lead again.
Master Inbox unified inbox dashboard
Master Inbox helps GTM & Revops teams manage Linkedin + Email inboxes in one clean view
Case studies

The Biggest agencies rely
on Master Inbox everyday

Three teams. Three setups. Same outcome — zero missed replies.
Sales team working replies together in Master Inbox
Agency customer logo
"Master Inbox helped us cut our response-handling team by more than half while enabling each rep to handle five times the workload. Quality improved, response times got faster, and we’re never going back."
Nick Verity
CEO of Cleverly
View full case study
Sales team working replies together in Master Inbox
Agency customer logo
“Master Inbox delivers exactly what they promise: we’re capturing all of our replies, and their team has replaced fragile API workarounds with reliable integrations we no longer have to worry about. We absolutely endorse them.”
Eric Nowoslawski
Founder Growth Engine X
View full case study
Sales team working replies together in Master Inbox
Agency customer logo
“Reply management was our number-one reason for client churn. Once we embedded Master Inbox into our portal and workflow, everything changed clients stopped complaining, churn dropped, and they could finally manage leads at scale.”
Nick Abraham
ounder of LeadBird
View full case study

Managing Linkedin DMs + Email inboxes is chaotic.
Replies Get Missed. Clients Get Pissed.

Your team wastes hours jumping between accounts, chasing replies, and updating sheets. Master Inbox centralizes every campaign response so you stay organized, responsive, and in control.
Organize and manage

Stay in control, no matter how many Inboxes you handle

Build a clear structure for your inboxes and workflows. From unlimited client inboxes to labels, filters, and shared workspaces you’ll always know where everything belongs.

Scale effortlessly with unlimited client inboxes synced in real-time.

Manage 1k or 100k mailboxes across any sequencer. Use Smartlead, Bison, Instantly, HeyReach, Expandi or Aimfox, we support them all in one Master Inbox.
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All replies, all client workspaces, campaigns or forwarded replies, in one inbox.

Get a clean, real-time view of every response no matter which platform or sender it came from.
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Views and Filters

Create custom view and add filters to support internal operations and workflows, from follow ups, to reply handling to support. Automatically exclude warm up and unwanted emails.
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Workspaces

Add unlimited clients, create unlimited master inboxes for each of them! Assign channels across Email or Linkedin and provide a custom experience using our member permissions for client and team access!
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Labelling

Track replies, response times, lead progress, and export insights for client check-ins anytime.
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Communicate and perform

Work smarter, reply faster, deliver better

Keep conversations flowing and clients happy. Whether it’s smart lead management, quick replies, LinkedIn + Email outreach, client-ready reports, or reminders you’ll always stay one step ahead.
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Create deal stages. Custom lists & pipeline views.

Allow client workspaces to manage their own custom lists for better deal and sales cycle management .
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Reminders and Snooze

Set reminders, get a notification on slack when you need to act, see them popup right back into your inbox at the right time and place!
reply template

Quick Replies

Reply templates combined with keyboard shortcuts allow you to reply faster and on brand every single time.
More features

And much more..

Keep conversations flowing and clients happy. Whether it’s smart lead management, quick replies, LinkedIn + email outreach, client-ready reports, or reminders you’ll always stay one step ahead.
Merge threads
Archive replies
Universal message search
Inbound prospect routing
Send message API
Custom views
Custom Inboxes
Notifications
Integrations
Unlimited Channels
Follow ups
Add notes for prospects
Auto Store Attachments
AI Labeling
AI Reply Agents
Linkedin DMs
Multiple Inboxes
Client Workspaces
Warm up tag handling
Custom webhooks
Slack notifications
Custom labels
Custom lists
Reminders for Linkedin DMs
DM & Email Tagging

One Inbox. Every channel. Zero missed leads.

From Gmail, Outlook, LinkedIn DMs, native or through Expandi and HeyReach and custom SMTPs, Master Inbox gives your GTM and Rev Ops team a single, powerful view of every reply.
Master Inbox app screenshot

Threads that actually help you convert

We auto-thread conversations across tools, so your team always sees the full picture. Follow-ups stay on track and your team stops guessing who replied last.
new thread view min
Pricing

What is a missed reply worth?

Unlimited users on every plan. Prices are annual, billed monthly. Month-to-month +25%. Annual prepaid saves 15%.

You run reply management for clients. Priced on client workspaces, unlimited users on every plan.

AGENCY
$599/mo
15 client workspaces
3,000 mailboxes
$40 per client
  • AI reply agents & labeling
  • Your own LLM key, no markup
  • Workflows, webhooks, core API
  • Slack reply bot
  • Client inbox & permissions
  • All major sequencers
Book a demo
Most popular
SCALE
$1,297/mo
40 client workspaces
15,000 mailboxes
$32 per client
  • Everything in Agency
  • Provisioning API & SSO
  • Embeddable inbox
  • Inbound reply forms, 24/7
  • Analytics & SLA reporting
Book a demo
UNLIMITED
$1,697/mo
Unlimited client workspaces
30,000 mailboxes
  • Everything in Scale
  • Unlimited client accounts
  • HubSpot Suite included
  • Priority support
  • Past 30k: priced per mailbox
Book a demo
Under 5 clients? Apply for the Ramp.$299/mo to start · click to see how it works

The Ramp is the full Agency plan at $299 a month while you are still small. Same onboarding as everyone else. The step-ups are printed on your invoice from day one, so nothing sneaks up on you. There is a one-time $500 onboarding fee and we credit it back once you reach Agency. A few spots open each month.

$299months 1–2 · up to 5 clients
$449months 3–4 · up to 10 clients
$599month 5+ · Agency, 15 clients

You qualify with fewer than 5 clients, a live sequencer, and replies coming in. The application takes 2 minutes and we answer within a day.

You sell for your own company. Unlimited seats, priced on dedicated mailbox tiers, never per rep.

TEAM
$799/mo
2,000 mailboxes
Never priced per seat
  • AI reply agents & labeling
  • Email + LinkedIn in one thread
  • Reply from Slack or email
  • Who-replied attribution
  • Workflows, webhooks, core API
Book a demo
Built for revenue teams
REVENUE
$1,499/mo
7,500 mailboxes
HubSpot today · Salesforce on the roadmap
  • Everything in Team
  • HubSpot Suite included
  • Rep activity & SLA reporting
  • Round-robin assignment
  • Pipeline analytics
Book a demo
ENTERPRISE
from $2,500/mo, annual
Custom mailbox volume
Priced per mailbox at volume
  • Everything in Revenue
  • SSO & EU data residency
  • Signed DPA
  • Custom integrations
  • Named CSM, priority support
Book a demo

Master Inbox as the reply engine inside your own product. Your brand, our machinery.

OEM
PLATFORM
from $2,500/mo, annual
Workspace & mailbox allotment included, then per workspace above it
  • Zero-branding embed on your domain
  • Provisioning API
  • SSO & auto-login, hidden chrome
  • White-labeled notification SMTP
  • Your LLM keys, all tenants
Book a demo
EMBEDDING FOR YOUR OWN CLIENTS?

Putting Master Inbox inside your client portal, not reselling it? You don't need Platform.

  • Embeddable inbox is included in Scale
  • White-Label Embed add-on: +$900/mo
  • Upgrade to Platform when you provision at volume
See full pricing

One business with inbound leads. The agent replies in minutes, 24/7, and books the meeting.

REPLY AGENT
$499/mo
Less than a part-time reply handler, awake 24/7
  • Replies in minutes, day and night
  • Books meetings automatically
  • Escalates the tricky ones to you
  • Trained on your offer & FAQ
Book a demo
Fastest speed-to-lead
REPLY + SMS
$799/mo
A2P registration done for you
  • Everything in Reply Agent
  • Texts leads back in seconds
  • Two-way SMS, same agent
  • Compliant A2P 10DLC setup
Book a demo
REPLY + SMS + VOICE
$1,199/mo
Early access · voice minutes billed at usage
  • Everything in Reply + SMS
  • Calls new leads within minutes
  • Books or transfers live
  • We onboard you personally
Book a demo
See full pricing, the Ramp and FAQs →

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!

Absolutely. Master Inbox integrates smoothly with Instantly and many other outreach tools like HeyReach, Smartlead, Lemist, etc. This allows agencies to manage replies from multiple outreach tools in a single, combined inbox.

Teams often manually categorize replies, notify clients, and update CRMs. Master Inbox solves this with advanced AI labeling, workflows, and CRM integrations.

Master Threads automatically groups all conversations with a prospect into one unified thread, even if they come from different campaigns or subject lines. This ensures your team always sees the complete conversation history in one place.

Yes. Master Inbox provides API access that allows you to connect your platform directly to the inbox system, enabling authentication, workspace connections, and a fully integrated user experience.

Yes. Clients can easily invite their team members into their workspace, making it simple for teams to collaborate on replying to leads and managing conversations together.

Yes. Master Inbox works with popular inbox providers and resellers such as Hypertype, InboxKit, Zapmail and other inbox provisioning services. Many of these integrations are already built, making setup extremely fast.

Yes. Workflows can automatically send notifications through Slack or email whenever an important reply is received, ensuring teams respond quickly to high-value leads.

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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