Growth · alternatives · 2026

24 alternatives to Happy Mail

Inbox Helper For Gmail

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Happy Mail launched in 2019; newer entries below may have overtaken it.

1
Joy for Gmail▲96
A Gmail with clearer inbox, focused writing, less noise
Mar 2026 · chromewebstore.google.com · its alternatives →
2
Inbox by Google▲1,147
Next generation inbox
2014 · google.com · its alternatives →
3
Inboxer▲212
A clean, open-source desktop client for Google Inbox 💌
2018 · denysdovhan.com · its alternatives →
4
Boxy▲572
Inbox by Gmail, finally on your Mac
2015 · boxyapp.co · its alternatives →
5
Inbox Zero Tabs▲398
Split inbox tabs for Gmail. 100% private. 100% free
2025 · chromewebstore.google.com · its alternatives →
6
Inbox Zero▲821
Clean Up Your Inbox In Minutes Newsletter management, AI automation, and email analytics. Inbox Zero is the open-source email app that puts you back in control of your inbox.
2023 · getinboxzero.com · its alternatives →
7
New Gmail▲935
The new version of Gmail web
2018 · blog.google · its alternatives →
8
Silent Inbox for Gmail▲251
Receive unimportant emails and newsletters on your schedule
2020 · workspace.google.com · its alternatives →
9
Hello Inbox▲283
Hey HN, I built an email deliverability SaaS with a RAG system. It's trained on all my knowledge and hundreds of real deliverability use cases from 4+ years experience as an Email Deliverability Specialist on Upwork. It solves a frustration problem a lot of businesses are experiencing. I'm looking for feedback so let me know in the comments.
Aug 2026 · helloinbox.email · its alternatives →
10
InboxSDK▲508
First usable API to write Gmail Apps for 1B active users
2015 · inboxsdk.com · its alternatives →
11
Darwin Mail▲259
Enhance Gmail to get your Google Inbox features back.
2019 · darwinmail.app · its alternatives →
12
Mailjoy▲513
Mailchimp for direct mail
2017 · its alternatives →
13
Zero▲845
Hi HN, I’m Nizar, and I’m building Zero (https://0.email) — an AI-powered email client that manages your inbox for you. Email hasn’t changed in decades, even though the way we work has. The average knowledge worker now spends close to 30% of their week on email, constantly reacting, replying, and sorting through noise. It’s become one of the biggest productivity sinks in modern work. At the same time, AI has transformed how we write, plan, and collaborate — yet our inboxes are still stuck in the past. I built Zero to fix that. Zero automatically prioritizes, organizes, and even…
2025 · 0.email · its alternatives →
14
Mailjoy 2.0▲182
Delightfully simple postcard marketing
2017 · its alternatives →
15
The Inbox Zero Challenge▲115
Gamify managing your inbox, reach inbox zero within minutes
2022 · coda.io · its alternatives →
16
Superinbox▲531
Email vibing in your Gmail / Outlook
Oct 2025 · superinbox.com · its alternatives →
17
Warmbox▲383
Warm-up your inbox and never land in spam
2021 · warmbox.ai · its alternatives →
18
Boxy 2▲301
The best Mac client for Inbox by Gmail
2017 · boxyapp.co · its alternatives →
19
Neat Messages for Gmail▲121
No more long and annoying lines of text in Gmail
2018 · chromewebstore.google.com · its alternatives →
20
Reply▲325
Send cold emails that feel warm
2015 · reply.io · its alternatives →
21
Signal – Edit emails in your Gmail inbox▲151
2013 · trysignal.com · its alternatives →
22
Gentle Invoice▲140
AI-powered inbox assistant for managing invoices
2025 · its alternatives →
23
Email Warm-Up Tool by Reply▲311
Make sure your emails land in the inbox, not spam
2021 · reply.io · its alternatives →
24
Inbox When Ready▲116
Protect your focus... hide your Gmail inbox by default
2016 · chromewebstore.google.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 →