Right Inbox vs Mixmax for Gmail Sequences: Which Scales Better?

Right Inbox vs Mixmax for Gmail sequences is a real decision, not a marketing one. Both live inside Gmail, both send timed follow-ups, both stop when someone replies, and both do mail merge. They diverge on what happens after the first two or three people are using them.

This comparison is built on what each vendor documents on its own pages, checked on 17 September 2026. Prices move constantly in this category, so this post describes packaging shape rather than quoting figures — check the current numbers on each vendor's pricing page before you buy.

The verdict up front#

If you are one person, or two, and your sequences run out of your own Gmail account to lists you assembled yourself, Right Inbox is the better tool. It is a Gmail extension that adds sequences, mail merge, tracking, templates, reminders and CRM logging to the compose window you already use. There is nothing to adopt and nothing to migrate.

If you are a sales team, Mixmax is the one that keeps working as you grow. It carries per-stage sequence reporting, engagement signals that sync to HubSpot and Salesforce, and outreach steps that are not only email — its own product pages describe messaging "across email, phone, SMS, and LinkedIn". That is a meaningfully larger surface, and it comes with a meaningfully larger setup.

The honest framing is that these are not the same class of product. Right Inbox is a Gmail power-up. Mixmax is a sales engagement platform that happens to run inside Gmail. Picking the wrong class costs more than picking the wrong vendor.

At a glance: Right Inbox vs Mixmax#

The table below compares only things each vendor states on its own pages. Where a page does not address a dimension, this says so rather than guessing.

How many emails can you send in a Gmail sequence?#

Neither tool answers this, because neither tool decides it. Both send through your own Gmail account, so Google's sending limits are the ceiling — and no extension raises them.

Google's consumer Gmail help page states that limits apply above 500 emails sent in a day and above 500 recipients in a single email. Google Workspace is documented separately and higher: 2,000 messages per day per user (500 on trial accounts), 2,000 recipients per message with a maximum of 500 external recipients, and 3,000 external recipients per day. Both sets of figures were read on Google's own pages on 17 September 2026.

Practical consequence: a 300-person mail merge with three follow-up stages is 1,200 sends spread over a fortnight, and that is comfortable on Workspace and tight on consumer Gmail. If you hit the limit, Gmail throttles the account — not the tool — and the follow-ups queued behind it are what suffer.

Where Right Inbox wins#

Right Inbox wins on time-to-first-sequence. You install the extension, open a compose window, write the first email and the follow-ups, set the delay, and send. There is no workspace to configure, no seats to assign, no CRM to connect first.

It also wins on breadth of small, useful Gmail features that have nothing to do with outreach. Its features page lists send later, reminders, private notes, multiple signatures, templates, recurring emails, embedded GIFs, smart link previews, inbox pause, email encryption, an email summariser, tracking, mail merge, CRM sync and sequences. Several of those are things a solo operator would otherwise buy separately.

The second win is one people notice only after a month: nothing about Right Inbox changes how Gmail works. The compose window is still the compose window, threads are still threads, and a colleague looking at your sent folder sees ordinary mail. Tools that wrap Gmail in their own interface make that trade the other way, and it is a real cost when you spend all day in the inbox rather than in a campaign screen.

• Follow-ups are written in advance and sent only if the condition holds — its own wording is to send them "if recipients don't open or reply to your first email".
• Reply detection is automatic and needs no action from you: "If you do receive a reply, then all your scheduled follow-ups are immediately canceled."
• Mail merge is positioned directly at Gmail outreach, so the merge and the follow-up live in the same product.
• Recurring emails and reminders cover the internal, non-sales half of follow-up that most sequence tools ignore.

Does Right Inbox detect replies automatically?#

Yes. Right Inbox's sequences page states that when a reply arrives, every scheduled follow-up for that thread is cancelled without you doing anything. That is the single feature that separates a sequence tool from a pile of scheduled sends, and Right Inbox has it.

Two caveats worth knowing before you rely on it. Reply detection is tied to the thread, so a prospect who answers from a different address or starts a fresh thread may not register as a reply. And Right Inbox's own material describes no-reply as the trigger for follow-ups on its sequences page, while the features page also mentions opens — so confirm on the current build which conditions your plan exposes.

Where Mixmax wins#

Mixmax wins everywhere the work is shared. Its sequence view reports "Sent, opened and replied, per stage", which is the number a manager needs and the number Right Inbox does not surface in the same shape. Engagement signals sync into HubSpot and Salesforce, so the record of what was sent lives where the pipeline lives rather than in one person's Gmail.

It also wins on reach beyond email. Mixmax's product pages describe outreach "across email, phone, SMS, and LinkedIn", with an example cadence of an email on day one, a LinkedIn touch on day three and a call reminder on day six. If your process already includes calls and LinkedIn, running them in the same cadence as the email is a genuine advantage.

There is a third, quieter win: Mixmax is built so that the sequence is not the only thing on the page. Its product material describes tasks and reminders so a follow-up is not missed, engagement data combined across email, calendar, meetings and CRM into a view of the customer, and recommended next actions surfaced in the inbox. Whether you want that depends entirely on whether outreach is your job or a part of your job.

Its reply handling is also broader in an interesting way. Mixmax states that sequences "stop the moment someone replies" and adds that "a calendar click or a poll answer counts too" — so booking a meeting from the email ends the chase, which is exactly the behaviour you want and a step beyond thread-only reply detection.

• Per-stage sequence analytics, so you can see which follow-up is doing the work.
• Recipients can be pulled from Salesforce or HubSpot, not only from a CSV.
• Scheduling, embedded calendars, polls and surveys are built in, and the engagement they produce feeds the stop condition.
• Higher tiers add AI assistance for sequence building and, on the Suite, advanced workflow rules.

Pricing model: two different shapes#

This post does not print prices, because both vendors change them and a stale number is worse than none. The shapes, read from their pricing pages on 17 September 2026, are what matter for a scaling decision.

Right Inbox publishes three tiers — Limited, Professional and Team. Limited is free and heavily capped, with the outreach features reserved for the paid tiers; Professional is the individual paid plan; Team is the multi-user plan. It is a short ladder with few decisions in it.

Mixmax publishes a free plan, then a set of per-seat Copilot tiers (Inbox, Meeting, Engagement), a combined Suite, and a Mixmax for Teams plan that requires five or more users. It also advertises a 14-day free trial of the full Suite with no card required, and sells several capabilities as add-ons rather than including them — a dialer for US and international calling, SMS, custom branding and domains, and additional sequence recipients.

The practical difference for a growing team: Right Inbox's cost is roughly seats multiplied by one number. Mixmax's cost is seats multiplied by a tier, plus the add-ons your process actually needs. Model the add-ons before you compare, or the two will look closer than they are.

Who each is genuinely for#

The clean split is not company size, it is whether the sequence is a personal habit or a team process. A habit needs to be fast to start and invisible the rest of the time. A process needs to be visible to someone who did not send the email — a manager, a colleague covering an account, a CRM record six months later.

That is the question to answer before you compare feature lists, because it decides which feature list you should be reading.

A third option, honestly#

Neither of these tools has a problem with the part of outreach that usually breaks first: the replies. A sequence that works produces a stream of inbound mail that has to be read, sorted and answered fast, and that is a different job from sending.

That is the job we do. We build AI Emaily, an AI email client for Gmail, Outlook and IMAP that triages what arrives and drafts replies you approve before anything sends, with undo and a full audit trail. Its voice comes from a Personal Context brain and per-client profiles that you set — not from reading your old mail — and we do not train models on your email.

The limit, stated plainly: AI Emaily is not a sequencer and does not run mail merge. If you need timed multi-step campaigns out of Gmail, you need Right Inbox or Mixmax, and nothing here changes that. Where we fit is the other side of the same workflow — see our take on handling follow-ups at scale.