Master Inbox vs Missive: Which Fits Outbound Teams? (2026)
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Why trust this comparison?
This comparison is written by the Master Inbox team and reviewed by our founder, Abdul Mukati. Every Missive fact comes from Missive's own pages, read on 28 October 2026, and each source is listed at the bottom. Master Inbox is one of the two products compared, so we stick to what is published, and we mark anything the pages do not say. Missive is a strong product for the work it was built for. For the full price list, read our Missive pricing guide. For other options, see the Missive alternative page and the Missive alternatives guide.
What Missive is
Missive is a collaborative inbox for teams. It brings email, SMS, WhatsApp, Messenger, Instagram and live website chat into one place, and it runs as desktop, web and mobile apps. Teams assign conversations to people or teams, talk in internal comments, share drafts, create tasks and keep an audit trail. It also includes an AI assistant, rules and automations, a REST API, rule-based webhooks and an MCP server.
Missive's own site and docs describe a general team inbox for support, sales and operations teams that share customer-facing mailboxes. It is priced per user on three plans: Starter, Productive and Business.
What Master Inbox is
Master Inbox is the reply inbox for outbound. It connects Smartlead, Instantly, EmailBison, Reply.io, Lemlist, HeyReach, Expandi, Aimfox and more, and shows every email and LinkedIn reply in one queue. It reads the mailboxes themselves, so it also threads forwards, CC replies and new-address replies that a sequencer's own inbox does not show.
Replies are labeled by intent as they land. Workflows route them to Slack, sync to HubSpot, stop a sequence when a meeting is booked and fire webhooks. Reply agents answer, follow up and book meetings on your real calendar. It works alongside the sequencer, CRM and support desk you already use. See the outbound teams and agencies pages for how teams set it up.
Missive vs Master Inbox side by side
1. Reply capture
Missive connects Gmail, Microsoft and IMAP/SMTP accounts as personal or shared accounts, with up to 10 personal and 5 shared accounts per user and extra shared accounts sold in blocks of 5. Conversations land in team inboxes where they can be assigned, and auto-assignment balances workload. Master Inbox is built around your sending stack: it connects to your sequencers and reads the mailboxes behind them, so replies from many mailboxes and clients arrive in one queue, with forwards and CC replies threaded in. Master Inbox internal data shows roughly 12% more replies captured than a sequencer reports.
Fit: Missive for conversations that arrive in shared company mailboxes, Master Inbox for replies to campaigns sent from many mailboxes.
2. Labeling and AI
Missive includes an AI assistant that reads thread context, searches the inbox and calendar, and drafts replies for approval. It offers tone matching, translation, summaries, custom prompts and AI rules, with Anthropic, OpenAI or Gemini models through Missive AI Credits or your own key. These features are in Productive and Business. Master Inbox labels every email and LinkedIn reply by intent as it lands, using thirteen default labels or your own taxonomy, on your own OpenAI, Anthropic or OpenRouter key. AI labeling then drives routing, and reply agents can respond, from human-in-the-loop to fully autonomous.
Fit: Missive's assistant helps people write better replies, Master Inbox's labels and agents sort and answer outbound replies at volume.
3. Integrations
Missive's integrations page lists 36 integration listings across 9 categories, including Zapier, Make, HubSpot, Salesforce, Pipedrive, Close, Zoom, Aircall, Google Drive and Asana. Integrations require Productive or Business. Its integrations directory does not list Slack or LinkedIn as of 28 October 2026. Master Inbox lists sequencers, LinkedIn tools, CRMs, booking tools, Slack, Zapier, n8n and Clay across 58 integration pages, and its REST API has 150+ endpoints with webhooks for every event, included on every plan. See the Slack and HubSpot pages.
Fit: Missive for a general business tool stack, Master Inbox for the outbound stack of sequencers, LinkedIn tools and CRMs.
4. Time to set up
Missive offers a 30-day trial of the Productive plan for a user's first organization, with no credit card. Trial limits are 25 users, 10 shared accounts, 2 personal accounts per user and 30 days of history. Master Inbox starts with a free 7-day POC, and onboarding is done with you: we connect your sequencers and inboxes. Agencies can clone a client workspace in one click, each with its own mailboxes, labels, members and limits.
Fit: Missive suits teams who want to self-serve a shared inbox, Master Inbox suits teams who want a guided start with their sending stack.
5. Interface and team work
Missive's strength is collaboration inside the conversation: assignments, internal comments, shared drafts, tasks and an audit trail, in desktop, web and mobile apps. Master Inbox gives sellers one queue across email and LinkedIn, with one thread per prospect, plus reporting on SLA tracking, reply coverage, missed replies and team performance by channel and label. Client logins are scoped to their own inbox only, and client reporting works without a login. Unlimited users on every plan means the whole team can work replies.
Fit: Missive for teams who talk through each conversation together, Master Inbox for teams who work a high volume of replies against an SLA.
6. Pricing
Missive is priced per user per month. Per its billing docs, Starter is $14 on yearly billing or $18 monthly for up to 5 users, Productive is $24 yearly or $30 monthly for up to 50 users, and Business is $36 yearly or $45 monthly with unlimited users. There is no free plan, and the trial runs 30 days. Master Inbox is priced on connected mailboxes and client workspaces: Reply Agent from $499 a month, Agency $599 with up to 3,000 mailboxes and 15 client workspaces, and Team $799 with up to 2,000 mailboxes. Every plan includes unlimited users and starts with a free 7-day POC.
Fit: Missive's bill follows headcount, Master Inbox's follows mailboxes and workspaces.
7. Support and security
Missive's Business plan adds SAML SSO, IP restrictions, advanced analytics and personalized onboarding. Its REST API and webhooks publish rate limits and retry rules, and webhook deliveries can carry an optional HMAC-SHA256 signature. Master Inbox is EU-hosted in Finland and Germany, GDPR-ready with data processing agreements on file, and onboarding is done with you on every plan. Client logins are scoped to their own inbox only, so an agency can show a client their replies without opening the rest of the account.
Fit: Missive's Business plan for SSO and IP controls on a team inbox, Master Inbox for EU-hosted outbound reply data with guided onboarding.
Quick comparison table
| Area | Missive | Master Inbox |
|---|---|---|
| Built for | General team inbox for support, sales and operations | Reply management for outbound teams and agencies |
| Channels | Email, SMS, WhatsApp, Messenger, Instagram, live chat | Email and LinkedIn replies from your sequencers, plus inbound forms |
| AI | AI assistant drafts replies for approval | Intent labeling on every reply, plus reply agents |
| Integrations | 36 listings across 9 categories; Slack and LinkedIn not listed as of 28 October 2026 | 58 integration pages, including Slack and LinkedIn tools |
| Pricing model | Per user per month, $14 to $36 yearly or $18 to $45 monthly | Mailboxes and client workspaces, unlimited users |
| Starting point | 30-day trial, no free plan | Free 7-day POC on every plan |
Missive figures come from its billing docs and pages, checked on 28 October 2026. Master Inbox figures come from our pricing page.
Who Missive suits
Missive suits teams that share customer-facing mailboxes and want to work on them together. If your day is shared company email, SMS, WhatsApp and website chat, with assignments, comments and tasks, and you want API, webhooks and an MCP server for your own tools, Missive is built for that. Teams that need SAML SSO and IP restrictions can look at the Business plan.
Who Master Inbox suits
Master Inbox suits outbound sales teams and lead generation agencies that send from many mailboxes and LinkedIn accounts. If your replies come from Smartlead, Instantly, EmailBison, HeyReach and similar tools, and you want every one labeled, routed and answered fast, it is built for that. Agencies that run client work get a workspace per client, and no per-seat charge when a client manager joins. Read our guides on reply management and the cold email reply management guide.
How teams use both
The two products connect to different parts of a stack, so they do not overlap. A team can keep Missive as the shared inbox for company email, SMS and chat, and use Master Inbox for the replies that come from outbound campaigns. Master Inbox labels each reply, sends hot ones to Slack with an approve button, syncs to the CRM and stops the sequence when a meeting is booked. Your sequencer keeps sending, and your support desk keeps handling tickets. Each tool stays in its lane, and the reply layer connects them. For more on the idea, see the unified inbox glossary entry and our shared inbox guide for outbound teams.
Frequently asked questions
What is the difference between Missive and Master Inbox?
Missive is a general team inbox for email, SMS and social conversations. Master Inbox is the reply inbox for cold outbound, built around sequencers, LinkedIn tools and AI intent labels.
How much does Missive cost compared with Master Inbox?
As of 28 October 2026, Missive costs $14, $24 or $36 per user per month on yearly billing, or $18, $30 or $45 monthly. Master Inbox starts with a free 7-day POC and is priced on mailboxes and workspaces, with unlimited users on every plan.
Does Missive work with LinkedIn?
Missive's integrations directory does not list LinkedIn as of 28 October 2026. Master Inbox connects HeyReach, Expandi and Aimfox and shows LinkedIn replies next to email in one thread per prospect.
Does Missive integrate with Slack?
Missive's integrations directory does not list Slack as of 28 October 2026. Master Inbox sends label-triggered Slack cards with an approve button.
Can I use Missive and Master Inbox together?
Yes. They connect to different parts of the stack. Keep Missive for the shared company inbox and use Master Inbox for outbound replies.
Does Master Inbox price per seat?
No. Plans are based on connected mailboxes and client workspaces, and every plan includes unlimited users.
Which is easier to set up?
Missive offers a 30-day trial with no credit card. Master Inbox starts with a free 7-day POC, and onboarding is done with you so your sequencers and inboxes are connected for you.
Sources
Missive facts checked on 28 October 2026 from Missive's own pages:
Master Inbox pricing comes from our pricing page. Start your free 7-day POC. Missive is a trademark of its owner. Master Inbox is an independent product and is not affiliated with Missive.