# Inbox Zero vs Sixty

Inbox Zero records 89,348 monthly visits with +6.8% month-over-month growth and Freemium, Free Trial pricing. Sixty records 0 monthly visits with -100% growth and Freemium pricing.

| Metric | [Inbox Zero](https://openaitools.app/tool/inbox-zero) | [Sixty](https://openaitools.app/tool/sixty) |
| :--- | :--- | :--- |
| Website URL | https://www.getinboxzero.com | https://www.sixty.app |
| Categories | AI Email Assistant, AI Assistant, AI Productivity Tools, AI Email Writer | AI Assistant, AI Productivity Tools, AI Email Assistant |
| Pricing Model | Freemium, Free Trial | Freemium |
| Monthly Visits | 89,348 | 0 |
| MoM Growth Rate | +6.8% | -100% |
| Primary Market | United States | Global |
| Direct Visits | 26,075 | 0 |
| Review Score | 4.4 | 4.3 |
| Saved Count | 6 | 2 |
| Supported Platforms | Website | Website |

## Inbox Zero

Inbox Zero is an AI executive assistant layered on top of Gmail and Outlook, built by developer Elie Steinbock (elie2222) and one of the most-starred open-source email projects on GitHub. Once you connect a Google or Microsoft account, it sorts incoming mail into smart categories such as To Reply, Newsletter, Marketing, Calendar, Cold Email and Notification, so you can triage by intent instead of scrolling chronologically. Every message that needs an answer arrives with a pre-written draft based on your past writing and your calendar availability, which you edit and send from the same view.

The tool is unusually broad for an email assistant. It blocks cold outreach before it reaches your inbox, shows you which senders you never open and lets you bulk-unsubscribe and archive them in a few clicks, and produces email analytics about who emails you most and what is clogging your inbox. Because it is open source and self-hostable, developers can inspect the code or run it on their own infrastructure — the company is SOC 2 Type 2 compliant and states your data is never used for AI training.

Inbox Zero also ships a dedicated email app for Gmail and Outlook across web, macOS, Windows and iPhone, is designed to be used from Slack, Telegram or Microsoft Teams, and offers AI meeting notes and pre-meeting briefings on higher tiers. The core app is free; the AI features are billed as a per-user subscription add-on.

**Pricing & Plans:** Freemium with a 7-day free trial on paid tiers. The email app is free; AI plans are billed per user per month (roughly $20 for Starter, $28 for Plus and $40 for Professional on annual billing, with monthly options costing about 20% more). Enterprise pricing with SSO, SCIM and on-premise deployment is available on request.

- **Automatic inbox labelling:** Incoming mail is sorted into categories like To Reply, Newsletter, Cold Email, Calendar and Notification as it arrives, using default rules or categories you define yourself.
- **Pre-drafted replies:** Emails that need a response get a draft written in your tone and referencing your real calendar availability and CRM context, ready to review and send.
- **Cold email blocking and bulk unsubscribe:** Stop cold outreach from ever reaching the inbox, see which newsletters you never read, then unsubscribe and archive them in bulk.
- **Email analytics:** Dashboards reveal who emails you most, which senders dominate your inbox and how your habits change over time so you can act on it.
- **Open source and self-hostable:** The full codebase is public under an open licence, so teams can audit, extend or self-host it, with SOC 2 Type 2 compliance and no AI training on your data.

**Strengths:** Genuinely open source and self-hostable, unlike most AI email assistants; Free core email app plus optional AI add-on keeps entry cost at zero; Combines triage, drafting, unsubscribe, cold-email blocking and analytics in one tool; Works across Slack, Telegram, Teams, web, desktop and mobile

**Limitations:** Best experience requires connecting Google or Microsoft account data; Free tier excludes most AI features, which need a paid per-user plan; Advanced tiers quickly get pricey for large teams

[Profile (Markdown)](https://openaitools.app/tool/inbox-zero.md)

## Sixty

Sixty was built around a simple thesis: modern knowledge workers are stuck in a technology-driven time crisis, buried in endless emails, nonstop notifications, false urgency and constant interruption. Its answer is an AI assistant that highlights what genuinely needs your attention and quietly handles the rest, so you can focus on the work and relationships that matter.

Practically, Sixty works as a layer over your inbox and calendar. It generates briefings before meetings by summarizing past interactions with the people involved, assembles customizable agendas for your day, week or even weekend, and triages email so the noise disappears. Alerts keep you informed of last-minute schedule changes and late notices, but deliberately only when they impact your day — the anti-notification design runs through the whole product. A people layer tracks your network and nudges you about birthdays and milestones.

The company is Sixty AI, Inc., founded by long-time Portland entrepreneur Mat Ellis. Sixty raised a $3.5 million seed round led by 468 Capital, with coverage in Axios Pro Rata, Fortune TermSheet, TechNews180 and Portland Inno. It also anchors the "Take Back Your Time" (#tbyt) movement, a campaign about changing attitudes and behaviors around time. Sixty is offered with both free and paid plans for individual professionals.

**Pricing & Plans:** 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.

- **Meeting briefings:** Arrive at meetings prepared with a summary of all past interactions with the people involved, generated automatically before you join.
- **Daily agendas:** Get customizable snapshots of your day, week or even weekend schedule so you always know what is next without digging through a calendar.
- **Inbox triage:** Eliminate inbox noise and surface only the email that actually needs your attention, so your inbox reflects real priorities.
- **Smart alerts:** Receive instant notifications for last-minute schedule changes and late notices — but only when they genuinely impact your day.
- **Relationship and outreach reminders:** Never miss a birthday or milestone for anyone in your network, and send a thoughtful greeting or gift in a couple of clicks.

**Strengths:** Attack a real problem — communication overload rather than more task-tracker features; Meeting briefings built from past interactions genuinely reduce prep time; Notification design deliberately filters out anything that does not impact your day; Combines email, calendar and relationship management in one assistant

**Limitations:** Requires connecting email and calendar accounts, which some users may find privacy-sensitive; Value depends on consistent use — it works best as a daily hub, not an occasional tool; The 2023 copyright date suggests the product has not been actively refreshed recently; Feature set focuses on relationship and communication management rather than general task management

[Profile (Markdown)](https://openaitools.app/tool/sixty.md)

## Frequently Asked Questions

### How do Inbox Zero and Sixty compare in monthly traffic?

Inbox Zero has 89,348 monthly visits, while Sixty has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Inbox Zero has a month-over-month growth rate of +6.8%; Sixty has -100%.

### How does pricing compare?

Inbox Zero: Freemium, Free Trial. Freemium with a 7-day free trial on paid tiers. The email app is free; AI plans are billed per user per month (roughly $20 for Starter, $28 for Plus and $40 for Professional on annual billing, with monthly options costing about 20% more). Enterprise pricing with SSO, SCIM and on-premise deployment is available on request. 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.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Superhuman](https://openaitools.app/tool/superhuman) | 6,514,241 | +7.9% | Paid | The AI productivity suite with agents, email, and docs that work wherever you do | [.md](https://openaitools.app/tool/superhuman.md) |
| 2 | [Missive](https://openaitools.app/tool/missive) | 631,353 | +0.2% | Free Trial, Paid | Collaborative inbox and email management for teams | [.md](https://openaitools.app/tool/missive.md) |
| 3 | [Motion](https://openaitools.app/tool/usemotion-com) | 511,886 | -15.5% | Free Trial, Paid | The AI super app for work — tasks, projects, calendar and meetings in one place | [.md](https://openaitools.app/tool/usemotion-com.md) |
| 4 | [Town](https://openaitools.app/tool/town) | 472,909 | -12.8% | Freemium, Free Trial | An adaptive AI work assistant that learns how you work across inboxes, calendars, chats, and apps | [.md](https://openaitools.app/tool/town.md) |
| 5 | [Spark Mail](https://openaitools.app/tool/spark-mail) | 435,229 | -13.5% | Freemium, Free Trial | Smart, focused email with AI help — for individuals and teams | [.md](https://openaitools.app/tool/spark-mail.md) |
| 6 | [Carly AI](https://openaitools.app/tool/carly-ai) | 340,001 | +1.5% | Freemium | Email an AI assistant and let it run your schedules, inbox and CRM | [.md](https://openaitools.app/tool/carly-ai.md) |
| 7 | [BlueMail](https://openaitools.app/tool/bluemail) | 319,805 | -5.8% | Free | A privacy-first email client with built-in AI writing help | [.md](https://openaitools.app/tool/bluemail.md) |
| 8 | [Fyxer](https://openaitools.app/tool/fyxer-ai-executive-assistant) | 298,288 | -3.8% | Free Trial, Paid | An AI executive assistant that works across your inbox, calendar and meetings | [.md](https://openaitools.app/tool/fyxer-ai-executive-assistant.md) |
| 9 | [Shortwave](https://openaitools.app/tool/shortwave) | 193,316 | -5.1% | Freemium, Free Trial | Automate your email with AI | [.md](https://openaitools.app/tool/shortwave.md) |
| 10 | [Spike](https://openaitools.app/tool/spike) | 93,475 | -26.6% | Freemium | AI-first email that turns your inbox into a chat-like workspace | [.md](https://openaitools.app/tool/spike.md) |

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Source: https://openaitools.app/compare/inbox-zero-vs-sixty

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