# Inbox Zero vs Spike

Inbox Zero records 89,348 monthly visits with +6.8% month-over-month growth and Freemium, Free Trial pricing. Spike records 93,475 monthly visits with -26.6% growth and Freemium pricing.

| Metric | [Inbox Zero](https://openaitools.app/tool/inbox-zero) | [Spike](https://openaitools.app/tool/spike) |
| :--- | :--- | :--- |
| Website URL | https://www.getinboxzero.com | https://www.spikenow.com |
| Categories | AI Email Assistant, AI Assistant, AI Productivity Tools, AI Email Writer | AI Email Assistant, AI Assistant, AI Productivity Tools, AI Copilot |
| Pricing Model | Freemium, Free Trial | Freemium |
| Monthly Visits | 89,348 | 93,475 |
| MoM Growth Rate | +6.8% | -26.6% |
| Primary Market | United States | United States |
| Direct Visits | 26,075 | 36,886 |
| Review Score | 4.4 | 4.2 |
| Saved Count | 6 | 0 |
| 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)

## Spike

Spike reimagines email as a chat-style feed instead of a stack of threads. You can connect an existing Gmail, Microsoft, or other account and use Spike as your daily client, or create a new business email on a custom domain hosted by Spike. Conversations group by person, attachments and files appear in one place, and a unified inbox pulls every account into a single view so you stop jumping between apps.

AI is woven through the experience. Smart sorting surfaces important messages first, AI summaries give instant snapshots of unread mail and long threads, and contextual drafting helps you compose quick replies or brainstorm with AI in your own voice. Built-in translation handles messages you receive or write, and natural-language search helps you find emails and files fast.

For teams, Spike adds shared inboxes for customer email, channels and groups for discussion, collaborative docs and notes, tasks that live inside the inbox, and one-click audio or video meetings. Non-Spike recipients still receive a normal email, so external contacts need no special setup. A free tier is available alongside paid plans, and the company also promotes iGPT, an email intelligence API that powers AI agents and automations with email context.

**Pricing & Plans:** Offers a free plan plus paid tiers; exact pricing and per-seat limits for teams change over time, so check the official pricing page for current numbers.

- **AI summaries and smart sorting:** AI snapshots unread mail and long conversations so you can catch up in seconds, while priority inbox surfaces the messages that matter first.
- **Context-aware AI drafting:** Draft quick replies, contextual responses, and brainstormed messages with AI assistance directly inside the composer.
- **Conversational email and unified inbox:** Threads are grouped by person like a messenger app, and every connected account lands in one inbox with file management and powerful search.
- **Team collaboration tools:** Shared inboxes, channels and groups, collaborative docs and notes, tasks, and one-click audio and video meetings all live inside your mail workspace.
- **Works with your existing email:** Use Spike with an existing Gmail or Microsoft account, or create a business email on a custom domain with Spike's email hosting.

**Strengths:** Conversational, chat-like interface makes long email threads easier to follow; AI summaries and drafting cut time spent catching up and replying; Consolidates mail, chat, docs, tasks, and meetings into one workspace; External recipients still get standard email, so no one else has to switch

**Limitations:** Best experience requires adopting Spike as your primary mail client; Advanced team features sit behind paid tiers, so costs scale with seats; Feature breadth can feel overwhelming for users who only want a simple inbox

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

## Frequently Asked Questions

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

Inbox Zero has 89,348 monthly visits, while Spike has 93,475. 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%; Spike has -26.6%.

### 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. Spike: Freemium. Offers a free plan plus paid tiers; exact pricing and per-seat limits for teams change over time, so check the official pricing page for current numbers.

## 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 | [Routine](https://openaitools.app/tool/routine-co) | 144,581 | -14.5% | Freemium | One AI-powered workspace for tasks, calendars, notes and meetings | [.md](https://openaitools.app/tool/routine-co.md) |

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

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