Best Email & Messaging Apps in 2026

Voice, video, and text chat

Baïkal

Email & Messaging

Lightweight CalDAV and CardDAV server based on sabre/dav. )

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ConvertKit

Email & Messaging

Kit (formerly ConvertKit) is the creator-first email marketing and newsletter platform. Grow your audience, automate campaigns, and sell without burnout.

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Loops

Email & Messaging

Loops makes email marketing for modern SaaS companies easy. It

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Instantly

Email & Messaging

Cold email outreach and deliverability platform

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Web app that lets you send email time capsules

Email & Messaging

I had an issue where I would journal stuff, and then never look at what I wrote. So I thought it'll be cool to schedule something that will get sent to you at a later time (like a time capsule). Also, was inspired by futureme, where you can send yourself letters that'll arrive in the futur

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Keila

Email & Messaging

Reliable and easy-to-use newsletter tool (alternative to Mailchimp and Sendinblue).

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AI in Email Conversations

Email & Messaging

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Lemlist

Email & Messaging

Cold outreach and email automation platform

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Mattermost

Email & Messaging

Open-source collaboration for developers

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AutoSend

Email & Messaging

Email for teams who ship with Agents Transactional, marketing, & automations in one platform. Priced by volume, not contacts

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Intercom

Email & Messaging

Fin is the leading AI Agent for customer service delivering the highest quality answers and handling the most complex queries. Employ Fin on any helpdesk or the Intercom Suite today.

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I built a Yahoo Messenger-inspired web chat app

Email & Messaging

I’ve been feeling a bit nostalgic lately, so I decided to build a little web chat app inspired by Yahoo! Messenger. Right now it’s got group chat rooms. Super simple setup, no email required to register. You can create your own room or hop into one that’s already open. Room owners can customize thin

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Brevo

Email & Messaging

Email marketing and CRM platform

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AgentMail

Email & Messaging

Hey HN, we're Haakam, Michael, and Adi. We're building AgentMail ( https://agentmail.to/ ), an API to give AI agents their own email inboxes. We’re not talking about AI for your email, this is email for your AI. We started building email agents because they can converse with

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Crisp

Email & Messaging

All-in-one business messaging platform

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Kapso

Email & Messaging

Hey HN, I'm Andres. I've been building Kapso as a solo founder, and just crossed 4,000 developers, all organic. WhatsApp has 3B+ users and 98% open rates. You'd expect developers to be building tons of stuff on it, especially when the US is the fastest-growing market in WhatsApp usage

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Transactional Email with a Stripe-like CLI

Email & Messaging

I'm the founder of AhaSend. We've built a transactional email service specifically for developers, with a Pay-As-You-Go pricing model ($0.50 per 1,000 emails) and up to 70% volume discount for platform partners. While there are many ESPs out there, we focused heavily on the Developer Exper

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Resend

Email & Messaging

The best way to reach humans instead of spam folders. Deliver transactional and marketing emails at scale.

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Rocket.Chat

Email & Messaging

Centralize real-time messaging, voice, video, AI, and apps for secure, reliable and unified communication among internal and external stakeholders.

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SAMA

Email & Messaging

Next-Gen self-hosted chat server and clients.

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ZeptoMail by Zoho

Email & Messaging

SMTP relay and email API for reliable transactional email delivery. Ensure your welcome emails, OTPs, and invoices hit the inbox every time. Whether you need a plug-and-play SMTP relay for your legacy systems or a high-speed email sending API for your modern app, ZeptoMail ensures your transactional emails reach the inbox in milliseconds

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Sendmux

Email & Messaging

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Element

Email & Messaging

Fully-featured Matrix client for Web, iOS & Android. )

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Eonvelope

Email & Messaging

Email archiving software that allows you to preserve your emails for an indefinite long period of time. )

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Listmonk

Email & Messaging

Open-source newsletter and mailing list manager

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Postmark

Email & Messaging

Reliable transactional and marketing email delivery service

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Recivo

Email & Messaging

Hi HN, these last couple of weeks I've been building 'Recivo', a simple way to receive emails programmatically. There are plenty of API-based services that can be used to send emails, but receiving them is harder. As a Recivo user, you create a new email address which will then immedi

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Beehiiv

Email & Messaging

Access the best tools available in email, helping your newsletter scale and monetize like never before.

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Buttondown

Email & Messaging

Buttondown is the last email platform you'll migrate to. We're focused on your success, not on bleeding you dry.

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Chatwoot

Email & Messaging

Chatwoot is an AI-powered, open-source customer support platform. Self-host on your infrastructure or use our cloud to manage conversations across live chat, email, WhatsApp, Instagram, Facebook, and more. Built-in AI assistant helps agents respond faster. A modern, privacy-focused alternative to In

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Mailchimp

Email & Messaging

Utilize real-time user behavior data and artificial intelligence to convert more customers. Easy to use, get started for free!

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Mephisto

Email & Messaging

Hi HN, I built Mephisto because I was frustrated with the current state of disposable email services—most are riddled with intrusive ads, trackers, and captchas. I wanted a tool that felt like a proper developer utility rather than a spam farm. The stack is React, Vite, and Tailwind. Key architectur

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SendGrid

Email & Messaging

SendGrid's trusted email API and marketing campaigns platform is now available through Twilio.com.

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Smart email filters to unfuck your email

Email & Messaging

Fix your inbox instantly

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Centrifugo

Email & Messaging

Language-agnostic real-time messaging (Websocket or SockJS) server.

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Talanoa

Email & Messaging

Hi HN, I’m a fullstack developer, and honestly, I’ve lost count of how many side projects I’ve worked on over the years. But one idea kept coming back to me: a different kind of email client. It first came to me in 2014: “What if we could handle emails more like conversations?” Every year, I’d revis

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