Alternatives

Products that do what Structure Pie does

Email API for Developers

1. 1IB
   I built Mailhub – A scalable API for sending emails with ease not tears▲104

   2024 · mailhub.sh

2. 2
   Blocks▲715

   AI-powered builder to create your emails

   2023 · useblocks.io

3. 3
   Quartz▲270

   AI email client built for focus. Runs locally on your Mac

   Jun 2026 · quartzmail.ai

4. 4
   Resend▲1,326

   Email for developers

   2023 · resend.com

5. 5
   Loops▲1,561

   Email made easy

   2023 · loops.so

6. 6
   Waypoint▲138

   Build and send data-rich emails, faster than ever

   2023

7. 7
   Mailmodo Email API▲244

   APIs to send automated interactive emails with forms

   2021

8. 8
   Mailercloud Email API Platform▲165

   1,000+ Emails per Second with 99%+ Deliverability

   Mar 2026 · mailercloud.com

9. 9
   Send API by beehiiv▲259

   Craft and send emails directly from your website or CMS

   2025

10. 10OS
    Open-Sourcing InboxSDK (YC S11) – Build Apps in Gmail▲257

    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

11. 11
    Newton Mail▲161

    Email app designed to supercharge business communication

    2019

12. 12
    FiloMail for Android▲140

    AI Gmail client that turns emails into clear tasks

    Jan 2026 · filomail.com

13. 13
    Waypoint▲103

    A refreshingly simple way to send data-rich emails

    2023

14. 14
    10xBeast▲270

    Customized email campaigns for outbound B2B sales teams

    2024

15. 15
    Blocks▲84

    Blocks is a drag-n-drop email builder

    2022

16. 16
    Mailazy▲203

    Cloud email infrastructure for the internet

    2022

17. 17
    Mailhub▲14

    Send & monitoring Tailwind Email with ease

    2025

18. 18
    Email API benchmarks▲113

    A real-time dashboard of email provider performance

    Mar 2026 · knock.app

19. 19
    FiloMail for iOS▲131

    AI-native inbox that turns emails into actionable to-dos

    2025

20. 20
    MailCue▲82

    Run as a fully hardened production email server.

    Apr 2026 · olib-ai.github.io

21. 21
    Banger Mail▲139

    Shared mailboxes for teams and AI agents

    Jul 2026 · bangermail.com

22. 22
    Enveloop▲105

    Build no-code email/sms templates, send with a simple API

    2023

23. 23
    MailToDock▲70

    Turn Gmail into Google Tasks with AI-powered

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24. 24MS
    Maildown – Super Simple Email API▲98

    2019 · github.com

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