Dev tools · alternatives · 2026
24 alternatives to I'm working on an open-source Gmail replacement
This is an open-source project aimed at providing an alternative to Gmail. Built for developers and users seeking a self-hosted email solution, it has been in development since 2013. The project offers source code… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Prices are shown for the 1 we have checked on their own sites, 1 of them free or with a free tier. I'm working on an open-source Gmail replacement launched in 2013; newer entries below may have overtaken it.
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- 2APA personal Gmail▲127
Hey guys, so I've been building my own Gmail for the past few weeks and would like your feedback. Find a preview here: http://i.imgur.com/UDz2y.png (Mouse cursor is over the "REPLY" button, to show the hover-effect) The app you see in the screenshot is what I've been using in the past week and it starts to feel better than the gmail interface. Just a quick explanation: - It's conversation-based like Gmail. - Conversations with new emails are on the left. - Conversations may be labeled ... based on predefined filters or manually. - Every conversation stays in the left sidebar until marked…
2012 · i.imgur.com · its alternatives →
- 3OS
Hi HN! We’re Aleem, Chris, Borys, Meichen and Zach from Streak (YC S11) and today we’re open sourcing our InboxSDK https://www.inboxsdk.com, which makes it easy to build apps for Gmail. Over 1.8B users spend their days in Gmail! Having your app built into the Gmail workflow is a better user experience and gives you great user retention. InboxSDK gives you a high-level, declarative API to insert your UI into Gmail without having to directly manipulate the DOM yourself. End users install a browser extension to use your app. The SDK can add UI to multiple areas of Gmail. For example,…
2022 · its alternatives →
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Free and open-source. Simple alternative to cal.com / calendly, built on Google-App-Script for Gmail users. Built with modern technologies like React, TypeScript, Shadcn/UI, and Vite.
2024 · github.com · its alternatives →
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Keep your Gmail inbox focused on people you know
2022 · keepknown.com · its alternatives →
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InboxSDK▲508First usable API to write Gmail Apps for 1B active users
2015 · inboxsdk.com · its alternatives →
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Sidemail 2.0▲306Hi all! I'm Kristyna, maker of Sidemail. I'd love to share with you what we've been building. We built Sidemail because sending emails from a SaaS app was way harder than it should be. Sidemail is made for developers and teams that want one simple place to handle SaaS emails with reliable delivery and no bloat. It has: - Everything for creating, managing and delivering SaaS emails in one platform, - Easy-to-use email API for sending password resets, receipts, etc. - Messenger for writing product updates and newsletters, - Email automations for onboarding and lifecycle flows, - Fast email…
Nov 2025 · sidemail.io · its alternatives →
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Hey Hacker news, Over the last couple months, I've been hacking with a friend on an email client for gmail that is similar to superhuman. A little backstory, we think that superhuman, in it's current implementation is vim-like. We hope to mostly match the performance and usability there and expand it into something more vscode-like. Looking for feedback and suggestions!
2023 · github.com · its alternatives →
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Hey HN! I'm the developer of one of the most popular Android clients for HN, Harmonic for Hacker News. Over the years I have recieved many requests to open source the app which I am finally doing - sorry about taking so long :) Having been very busy working on my PhD during the last two years - Harmonic has not recieved the attention it deserves. I therefore hope that open sourcing it can give it a new lease on life. I also hope that by posting here many of the nice people who have reached out to me will notice that the app is finally open source. I'm also happy to answer questions about the…
2023 · github.com · its alternatives →
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I got frustrated with Gmail's lack of customization, and built an extension for myself. It doesn't do much other than modify how Gmail is displayed in Chrome. Does it as minimally as possible (that I can engineer). Done locally, zero remote processing. Currently built the following settings (want to add more soon): Conversations: * Show newest message first * Show every message in a thread (sometimes they're collapsed into numbered bubbles) * Remove AI overviews (retches) Layout/UI: * Minimize the search & top bar * Minimize the far left "rail" (Mail/Chat/Meet) * Hide a bunch…
Mar 2026 · chromewebstore.google.com · its alternatives →
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opensend.ccfree▲160The open source email platform that runs on your server
21d ago · opensend.cc · its alternatives →
- 14EE
Manage sales and customer relationships directly inside Gmail. Streak is the CRM your team will actually use—integrated, smart, and loved by 750,000+ users.
2013 · streak.com · its alternatives →
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Responsive, Free, and Community Driven
2014 · dyspatch.io · its alternatives →
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Simplify / Gmail▲255Chrome extension that simplifies Gmail to the bare minimum
2019 · chromewebstore.google.com · its alternatives →
- 17AD
Hi, Piotr here I was collecting nice open-source companies for quite some time now. Mostly to take some inspiration and learn from their code. Last week, I though it would be fun to learn this Astro thing everyone's talking about. So I thought building a directory website out of this collection was pretty good idea. After 2 days of building, OpenAlternative was born. It's a community driven list of open source alternatives to proprietary software and applications. Enjoy and thank you for your support!
2024 · openalternative.co · its alternatives →
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.meteoremails▲107Send cold emails for free! Free and open source project
2020 · tempmailo.co · its alternatives →
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Use unique, random addresses when signing up for websites.
2025 · github.com · its alternatives →
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Everything you need to start sending newsletters, drip campaigns, transactional emails. Mailcoach is a fully featured email marketing platform built for growing creators, developers, and businesses.
2020 · mailcoach.app · its alternatives →
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- 22MA
The mnm project is building a legitimate* replacement for email: a client, a server, and a simple protocol between them. https://mnmnotmail.org The project is seeking contributors and patrons. It has been in progress since 2017, wholly self-funded. This is the first announcement to a wide audience. [*] Legitimate, meaning decentralized, store-and-forward, open protocol, open source.
2020 · its alternatives →
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Flashissue▲129Design amazing emails for Gmail with drag & drop editor.
2015 · flashissue.com · its alternatives →
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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →