Custos

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Custos helps you reply to emails in seconds by creating drafts that sound like you and include the right context. It lives inside your inbox, learns from your past emails, and writes replies that are fast, personal, and accurate.0
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What is Custos?

Custos is an AI email assistant designed for busy professionals who need to manage their inbox efficiently without sacrificing quality. It integrates directly into your email client, learning your unique writing style to draft accurate, context-aware replies in seconds. This allows you to reclaim your time while ensuring every communication sounds authentically like you.

Key Features

✍️ Personalized Tone Matching Custos analyzes your past sent emails to learn your unique voice, tone, and phrasing. This ensures that the AI-generated drafts it creates sound genuinely like you, maintaining authenticity and trust in all your professional communications.

🧠 Deep Contextual Drafts The tool doesn't just look at the last email; it analyzes the entire conversation thread, your calendar information, and public details about your recipients. This allows it to create highly relevant and accurate drafts that reflect the full picture, saving you from manually searching for details.

📥 Seamless Inbox Integration Custos operates directly within your existing inbox, eliminating the need to switch between different apps or tabs. Drafts appear right where you need them, creating a frictionless workflow that lets you review, edit, and send with minimal effort.

📊 Measurable Efficiency Gains By automating the initial draft, Custos helps you write emails up to 3x faster and can reduce your overall response time by 70%. This efficiency boost frees you up to focus on more strategic work that drives real impact.

How Custos Solves Your Problems:

  • For Client Communication: You're an account manager juggling multiple client requests. Instead of starting from scratch each time, Custos instantly drafts replies that incorporate the conversation history and maintain your professional, helpful tone, allowing you to respond promptly and strengthen client relationships.

  • For Internal Updates: As a project lead, you need to keep stakeholders informed without spending an hour crafting the perfect summary. Custos uses the context from recent meetings and email threads to draft clear, concise updates, ensuring your team stays aligned with minimal effort on your part.

  • For Sales Outreach: You need to follow up with dozens of leads personally. Custos drafts tailored follow-up messages that reference your previous touchpoints, helping you re-engage prospects with relevant, personalized content that has been shown to achieve a 30% higher response rate.

Unique Advantages

Human-Centric AI, Not a Robot Unlike generic AI writers, Custos is built to augment your skills, not replace them. Its primary goal is to capture your unique voice, ensuring the AI serves as a true personal assistant that enhances your natural communication style. It's AI that doesn't sound like AI.

Works Where You Work We believe you have enough tabs and applications to manage. Custos is designed with an intuitive, "out-of-the-box" philosophy, integrating smoothly into your email client. There's no complex setup or new platform to learn—just immediate value inside your existing workflow.

Conclusion:

Custos empowers you to master your inbox by combining the speed of artificial intelligence with the personality and context that only you can provide. It's the ideal solution for any professional looking to save significant time on email without compromising on the quality or authenticity of their communication.

Explore how Custos can restore balance to your workday and help you communicate more effectively!

FAQ

1. How does Custos learn my specific writing style? Custos learns by analyzing the emails you've previously written and sent. It identifies your common phrasing, sentence structure, level of formality, and overall tone. The more you use it, the more accurately it captures your unique voice, ensuring the drafts it produces are a reliable and authentic starting point.

2. Is my email data kept private and secure? Custos is built with user trust as a priority. When you connect your inbox, the tool is granted permission to read email content for the sole purpose of learning your style and generating relevant drafts. It is designed to operate securely within your email environment to augment your workflow.

3. Will I still have control over the final email? Absolutely. Custos provides a high-quality first draft, but you always have the final say. You can review, make any edits you see fit, or provide simple prompts to refine the message until it's perfect. You are always in full control of what you send.


More information on Custos

Launched
2024-03
Pricing Model
Freemium
Starting Price
$9.99 mo/user
Global Rank
4074733
Follow
Month Visit
5K
Tech used

Top 5 Countries

50.97%
36.55%
11.02%
1.45%
United States Spain Mexico Colombia

Traffic Sources

4.29%
0.93%
0.06%
4.44%
45.09%
45.03%
social paidReferrals mail referrals search direct
Source: Similarweb (Sep 25, 2025)
Custos was manually vetted by our editorial team and was first featured on 2025-07-29.
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