How do their growth rates compare?

Missive has a month-over-month growth rate of +0.2%; Sixty has -100%.

How does pricing compare?

Missive: Free Trial, Paid. Missive offers a free trial so teams can invite colleagues and evaluate the product before paying. Paid plans are subscription-based per user, with tiers determined by team size and required features. Exact rates are published on the Missive pricing page. Sixty: Freemium. Sixty offers both free and paid plans. You can sign up for free and upgrade to a paid tier for more capacity and features. Check the site for current plan details.

What are alternatives to Missive and Sixty?

Other tools in related categories include Superhuman, Motion, Town, Spark Mail, Carly AI.

Missive vs Sixty — Traffic (631.35K vs 0), Pricing & Verdict

Open AI Tools

Missive vs Sixty — Traffic (631.35K vs 0), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Missive	Sixty
Official Domain	missiveapp.com	sixty.app
Pricing Model	Free Trial, Paid	Freemium
Monthly Visits	631.35K (631,353)	0 (0)
MoM Traffic Delta	+1.05K (+0.2%)	-3.22K (-100%)
Primary Market & Share	🇺🇸 United States (52.1%)	🌐 Global (—)
Direct Visits / mo	480.37K	0
User Rating	4.7	4.3
Supported Platforms	Website	Website

Missive

Collaborative inbox and email management for teams

Shared team inboxes

Let multiple people work the same inbox with clear assignment, internal statuses, and visibility into who is answering what.

Internal conversation on emails

Discuss and prepare replies inside the email thread itself, so context stays attached and nobody is left out of the loop.

Tasks and workload visibility

Turn any email into an assigned task and see what each teammate is working on today, tomorrow, and next week.

Automations and rules

Automate repetitive routing, tagging, and follow-up with rules, rule templates, and workflow automations.

Strengths & Pros

+Turns shared inboxes into genuinely collaborative workspaces with internal chat
+Combines email, tasks, automations, and integrations in one client
+AI assistant pulls context from connected tools rather than acting as a generic sidebar
+Strong fit for small and mid-sized teams that run on email