# Inbox Zero vs Letty

Inbox Zero records 89,348 monthly visits with +6.8% month-over-month growth and Freemium, Free Trial pricing. Letty records 198 monthly visits with -85.4% growth and Freemium pricing.

| Metric | [Inbox Zero](https://openaitools.app/tool/inbox-zero) | [Letty](https://openaitools.app/tool/letty) |
| :--- | :--- | :--- |
| Website URL | https://www.getinboxzero.com | https://www.useletty.com |
| Categories | AI Email Assistant, AI Assistant, AI Productivity Tools, AI Email Writer | AI Email Writer, AI Email Assistant, AI Email Generator, AI Reply |
| Pricing Model | Freemium, Free Trial | Freemium |
| Monthly Visits | 89,348 | 198 |
| MoM Growth Rate | +6.8% | -85.4% |
| Primary Market | United States | India |
| Direct Visits | 26,075 | 77 |
| Review Score | 4.4 | 3.8 |
| Saved Count | 6 | 1 |
| 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)

## Letty

Letty positions itself as an inbox productivity layer rather than a full email client. After installing the Chrome extension, it appears alongside your Gmail composition window and analyses the thread in front of you. From there it can propose a contextually relevant reply, draft a longer message from a short prompt, or help you match the tone of earlier messages in the chain. The goal is straightforward: cut the minutes you spend staring at a blank reply box.

What separates Letty from a generic writing assistant is the training step. You can feed it your own documents, an FAQ list, or the text of a website, and it will pull answers and phrasing from that material when it writes. The dashboard reports how many characters you have attached, which makes it practical for support teams or founders who answer the same questions repeatedly.

Pricing follows a freemium shape with a genuinely usable entry point. The Free plan gives 10 AI credits each month and room for up to 400,000 training characters. Paid tiers step up quickly: Premium adds 150 credits and up to 4 million characters, and Platinum lifts credits to unlimited with a 10 million character training allowance. Credits reset on the first of each calendar month. The platform is Gmail-only today, with Outlook and Zoho described as future additions.

**Pricing & Plans:** Freemium. A Free plan offers 10 AI credits per month and up to 400,000 training characters. Premium is $9/month for 150 credits and 4M characters, and Platinum is $19/month for unlimited credits and 10M characters. Annual billing discounts are available, and credits reset each calendar month.

- **Context-aware smart replies:** Letty reads the incoming thread and proposes replies that fit the conversation, helping you clear your inbox without writing every response from scratch.
- **One-click email drafting:** Turn a rough idea into a finished message. Letty drafts professional emails for pitches, follow-ups, introductions, and everyday correspondence.
- **Train on your own knowledge:** Attach documents, FAQs, or a website URL and Letty draws on that material to answer questions accurately in your replies.
- **Style matching:** Letty can mirror your tone and phrasing so outgoing mail sounds like you rather than a generic template.
- **Gmail-native extension:** Letty lives inside Gmail as a Chrome extension, so drafting and replying happen where you already work with no separate app to manage.

**Strengths:** Works inside Gmail, so there is no new inbox to learn; Training on your own documents or website produces more accurate, on-brand replies; Free tier lets you test the core workflow at no cost; Clear, tiered pricing with an unlimited-credit top plan

**Limitations:** Officially supports Gmail only; Outlook and other providers are listed as “coming soon”; Free tier is capped at 10 AI credits per month and modest training-character limits; Credit allowances reset on the calendar month rather than the billing anniversary; Advanced controls for style fine-tuning require effort before replies fully match your voice

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

## Frequently Asked Questions

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

Inbox Zero has 89,348 monthly visits, while Letty has 198. 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%; Letty has -85.4%.

### 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. Letty: Freemium. Freemium. A Free plan offers 10 AI credits per month and up to 400,000 training characters. Premium is $9/month for 150 credits and 4M characters, and Platinum is $19/month for unlimited credits and 10M characters. Annual billing discounts are available, and credits reset each calendar month.

## 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 | [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) |
| 4 | [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) |
| 5 | [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) |
| 6 | [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) |
| 7 | [WriteMail.ai](https://openaitools.app/tool/writemail-ai) | 79,919 | -29.9% | Freemium | Turn a few key points into polished, on-tone emails | [.md](https://openaitools.app/tool/writemail-ai.md) |
| 8 | [Smart Assistant by Mailbutler](https://openaitools.app/tool/smart-assistant) | 47,200 | -8.7% | Freemium, Free Trial, Paid | An AI email assistant that drafts, summarizes, and perfects your messages in place | [.md](https://openaitools.app/tool/smart-assistant.md) |
| 9 | [FiloMail](https://openaitools.app/tool/filo-mail) | 35,548 | -5.1% | Freemium | AI email client that turns your inbox into clear next steps | [.md](https://openaitools.app/tool/filo-mail.md) |
| 10 | [AImReply – Free AI Email Writer](https://openaitools.app/tool/ai-email-assistant-aimreply) | 17,618 | +6.9% | Free | Write polished, on-tone emails in seconds — free, right in your browser | [.md](https://openaitools.app/tool/ai-email-assistant-aimreply.md) |

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

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