Dev tools · alternatives · 2026

24 alternatives to Nylas Sync Engine

Modern developer platform for email, contacts, & calendar

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Nylas Sync Engine launched in 2015; newer entries below may have overtaken it.

1. 1
   Nylas N1 Email App▲400

   The extensible, open source mail client.

   2015 · nylas.com · its alternatives →

2. 2
   Nylas Pro▲375

   The extensible, open source mail app.

   2016 · nylas.com · its alternatives →

3. 3
   Nylas Mail▲255

   The most powerful and extensible email client

   2017 · nylas.com · its alternatives →

4. 4
   Nylas▲6

   Communications APIs for Developers

   2019 · nylas.com · its alternatives →

5. 5
   Nylas - N1▲4

   The extensible, open source mail client...

   2015 · nylas.com · its alternatives →

6. 6
   Nylas CLI▲83

   Email, calendar, and contacts for AI agents

   May 2026 · cli.nylas.com · its alternatives →

7. 7
   Taiga▲104

   Mailbox theme for Nylas N1

   2015 · noahbuscher.github.io · its alternatives →

8. 8
   Mailcloud▲110

   A New Way to Email

   2014 · mailcloudapp.com · its alternatives →

9. 9
   Inbox▲175

   Next-generation email platform (pre-launch)

   2014 · inboxapp.com · its alternatives →

10. 10
    Nilas▲2

    The next-generation email platform

    2015 · its alternatives →

11. 11
    Nylas

    The future of email

    2015 · nylas.com · its alternatives →

12. 12
    SwiftIntro▲94

    Professional "matchmaking" done over email

    2014 · swiftintro.com · its alternatives →

13. 13
    Yesware Mobile▲107

    Email Tracking in Gmail for Sales Productivity

    2014 · apps.apple.com · its alternatives →

14. 14
    Apache Weex▲127

    A framework for building mobile cross-platform UIs

    2017 · incubator.apache.org · its alternatives →

15. 15
    Restyaboard▲197

    An open source alternative to Trello

    2015 · restya.com · its alternatives →

16. 16
    MailPile▲75

    A fast, responsive open source email client

    2014 · mailpile.is · its alternatives →

17. 17
    Duet▲211

    A self-hosted alternative to Trello

    2016 · its alternatives →

18. 18
    Hello Aria▲163

    I built HelloAria because every task manager I tried required too many steps to do something simple. The core idea: say "remind me to review the PR tomorrow at 10" and it creates the task, sets the reminder, and files it. No forms, no manual input. It works on iOS natively and also through WhatsApp, Telegram, and email — so you can capture tasks from wherever you already are. Tech stack: Swift/SwiftUI on the client, with NLP handling the intent parsing and entity extraction from natural language input. Looking for feedback from the HN community. What would make this actually useful for…

    Apr 2026 · helloaria.io · its alternatives →

19. 19
    Flock▲67

    Private Contact and Calendar Cloud Sync.

    2014 · play.google.com · its alternatives →

20. 20
    Planleaf▲97

    Task management with email

    2014 · planleaf.com · its alternatives →

21. 21
    Pingly▲86

    A new messaging platform working to evolve email

    2014 · its alternatives →

22. 22
    Yanado▲101

    Task management inside Gmail

    2014 · yanado.com · its alternatives →

23. 23
    Timeless▲80

    A unique clock and calendar visualization

    2015 · timeless.simplebots.co · its alternatives →

24. 24
    Seer▲98

    Making emails actionable.

    2014 · getseer.com · its alternatives →

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 →