The Master Inbox alternative for agencies, at $99 a month
Both tools pull your cold email replies into one inbox, sort them with AI, answer interested leads and book the meeting. Master Inbox starts at $599 a month on an annual contract. Revbound starts at $49, month to month. If you are looking for a Master Inbox alternative, here is what you get for the difference, including where Master Inbox is still the better pick.
Master Inbox Agency
Their entry plan for agencies.
- 15 client workspaces
- Unlimited users
- Email and LinkedIn replies in one thread
- AI reply agents and labels
- Calendar booking
- Workflows, webhooks and API
- Analytics and SLA reporting (from $1,297)
- HubSpot suite (from $1,697)
Revbound Agency
For agencies running campaigns for several clients at once.
- 10 clients, 1,500 replies a month
- Unlimited team seats and sequencer accounts
- AI sorting and drafted answers, AI included
- Interested leads answered within 5 minutes
- Free calendar times offered, meeting booked on yes
- Out-of-office pick-ups and 2 months of follow-ups
- Weekly client reports with proof of every meeting
- LinkedIn replies
Running more than 10 clients? Revbound Connector has unlimited clients for $149 a month. Master Inbox charges $1,297 for 40 clients and $1,697 for unlimited.
All Revbound plansFeature by feature
| Master Inbox | Revbound | |
|---|---|---|
| Price and contract | ||
| Cheapest plan | $299 / month (Ramp, under 5 clients, by application, $500 onboarding fee) | $49 / month (Solo) |
| Agency plan | $599 / month, 15 clients | $99 / month, 10 clients |
| Unlimited clients | $1,697 / month | $149 / month (Connector) |
| Contract | Annual. Month to month costs 25% more | Month to month |
| Pay once | No | $149 lifetime plan |
| Free trial | 7 days | 3 days, self-serve, every feature |
| Users | Unlimited on every plan | Unlimited on Agency and Connector, 1 on Solo |
| AI costs | Bring your own LLM key | Included, or bring your own key |
| Replies | ||
| Unified inbox for your sequencers | Yes | Yes |
| AI labels on every reply | Yes | Yes |
| AI answers interested leads on its own | Yes, after a review period, per label | Yes on Agency, within 5 minutes, and you can take over |
| LinkedIn replies in the same thread | Yes | No, email only |
| SMS and voice | Add-on plans from $799 / month | No |
| Follow-up | ||
| Out-of-office leads picked up when they are back | Not described on their site | Yes |
| Quiet leads followed up | Mentioned, no schedule given | Every 3 to 4 days for 2 months |
| Referrals ("talk to my colleague") followed up | Not described on their site | Yes |
| Booking | ||
| Offers times that are free on your calendar | Yes | Yes |
| Books when the lead says yes | Yes | Yes |
| Calendars | Cal.com, Calendly, Chili Piper, Google Calendar, GoHighLevel, HubSpot | Cal.com, Google Calendar |
| Integrations | ||
| Email sequencers | Smartlead, Instantly, Email Bison, PlusVibe, Reply.io, Salesforge, Mixmax | Instantly, Smartlead, Email Bison, PlusVibe, SendKit, ArcSend |
| CRM sync | HubSpot, Salesforce, Pipedrive, Attio, Close and more | Built-in pipeline, no CRM sync yet |
| Slack | Reply from Slack | Alerts in Slack |
| API | API, webhooks, workflows | API and MCP |
| Agency | ||
| Client workspaces and permissions | Yes | Yes |
| Client reports | Analytics and SLA reporting from $1,297 / month | Weekly reports with proof of every meeting, from $99 |
| White label | Embed from $1,297, full white label from $2,500 | No |
| Matching and paid introductions | No | Yes, on Connector |
What a year costs as you add clients
| Clients | Master Inbox | Revbound | You keep |
|---|---|---|---|
| Up to 10 | $7,188 (Agency) | $1,188 (Agency) | $6,000 |
| Up to 15 | $7,188 (Agency) | $1,788 (Connector) | $5,400 |
| Up to 40 | $15,564 (Scale) | $1,788 (Connector) | $13,776 |
| Unlimited | $20,364 (Unlimited) | $1,788 (Connector) | $18,576 |
Master Inbox prices are their annual rates billed monthly, from masterinbox.com/pricing on 29 October 2026. Revbound plans include a monthly reply allowance (1,500 on Agency, 5,000 on Connector). Extra replies are $15 per 1,000.
Pick the one that fits how you work
Pick Master Inbox if
- You run LinkedIn and email together and want both in one thread
- Replies have to sync into HubSpot, Salesforce or Pipedrive
- You want SMS or voice follow-up on inbound leads
- You resell the inbox under your own brand
- You need SLA and per-rep reporting for a large reply team
Pick Revbound if
- Your outbound is email, and every reply needs an answer fast
- You want leads followed up for weeks without anyone remembering to
- Clients ask what you did for them, and you want to show the meetings
- You use SendKit or ArcSend
- You would rather not sign an annual contract or book a sales call to start
Questions about switching
Is Revbound a Master Inbox alternative?
Yes, for email. Both put every sequencer's replies in one inbox, label them with AI, answer interested leads and book meetings from free calendar times. Revbound does not handle LinkedIn, SMS or voice.
Why is Revbound so much cheaper?
We do less. Revbound is built for email replies, follow-up and booking, with no LinkedIn, SMS, voice or CRM suite to pay for. It is also self-serve: you sign up and connect a sequencer without a sales call.
How do I move over from Master Inbox?
Connect the same sequencer accounts and calendar to Revbound and it pulls your replies in from there. There is nothing to export, and the free trial lets you run both side by side before you cancel anything.
Does Revbound send replies without my approval?
On Agency and Connector, yes. When a lead replies with interest, Revbound answers in the same thread within 5 minutes, and you can take over at any point in those 5 minutes. On Solo every answer is a draft for you to read and send.
Does Revbound work with LinkedIn?
Not today. Revbound reads email replies only. If LinkedIn replies are a big part of your pipeline, Master Inbox covers both.
Do I need my own AI key?
No. Monthly plans include the AI. You can still connect your own Anthropic, OpenAI, Gemini, Azure OpenAI or OpenRouter key if you prefer.
Master Inbox is a trademark of its owner. Revbound is not affiliated with Master Inbox. Their features and prices are taken from masterinbox.com on 29 October 2026 and may have changed since.
See it on your own replies
Connect a sequencer and a calendar, and watch Revbound sort, answer and book from the replies already sitting in your campaigns.