No moat. Still in business.
Software directory for those who don’t want to rebuild, own the updates, the bugs, the support.
- Sunnybox
Connect email accounts and get messages sent to your webhooks, with an API for replies and content analysis.
Since 2023
Free trial · Developer tools · Developers
- Maileroo
An SMTP relay and email API for sending transactional and marketing mail from apps, with searchable delivery logs.
Free plan · Transactional email · Developers
- Lettermint
Sends app and site emails such as receipts and password resets through EU-only servers, with an API, SMTP and SDKs.
Free plan · Email marketing · Developers
- Sweego
Send transactional email and SMS from your app through one API, then track delivery, with data kept in France.
Transactional email · Developers
- Pharos
Sends app email such as receipts and resets over an API or SMTP, and checks domain authentication before you start sending.
Free plan · Transactional email · Developers
- AhaSend
Sends app emails through an API or SMTP relay, plus simple campaigns, hosted in Europe for developers and software teams.
Since 2025
Free plan · Email marketing · Developers
- Pidgeon
Gives AI agents their own email addresses and inboxes through an API, hosted in the EU, for developers building agents.
Since 2026
Free plan · Transactional email · Developers
- Emails. Done.
Sends ready-made app emails like password resets, verification and billing notices for developers who want no email setup work.
Since 2026
Transactional email · Developers
- Lumbox
Gives each AI agent a real email address, and soon a phone number, so it can read mail, reply and use login codes.
Since 2026
Free plan · Developer tools · Developers
- Deplexo
Connect a Git repo and every push gets built and served as a live app with its own HTTPS address, for developers.
Free plan · Developer tools · Developers
- MailChannels
Sends email for hosting companies and multi-tenant apps, and stops spam from compromised customer accounts before it hurts delivery.
Transactional email · Developers
- Anypost
An email sending API and SMTP service for apps sending large volumes of receipts, resets and alerts, with a vetted shared network.
Since 2026
Subscription · Transactional email · Developers
- Pingram
One API for sending and receiving email, SMS and voice calls, with US A2P 10DLC SMS registration handled for you.
Free plan · Transactional email · Developers
- SMTPfast
An email sending API for developers that shows every message's path from queue to delivery, bounce or open.
Free plan · Transactional email · Developers
- Helo
Email API and SMTP relay for sending app emails, priced on usage, from an independent self-funded team.
Since 2026
Pay as you go · Transactional email · Developers
- MailboxKit
Gives AI agents their own email address through an API or MCP server so they can send, read and reply to mail.
Since 2026
Free plan · Transactional email · Developers
- SendRaven
Lets AI agents send, receive and reply to email in threads over an API or MCP, with usage limits and approvals.
Free plan · Transactional email · Developers
- Sidemail
Sends app emails like password resets through an API or SMTP, plus product updates and automated sequences, for SaaS companies.
Since 2025
Free trial · Email marketing · Software companies
- DollarDeploy
Deploys apps from a GitHub repo onto a server in your own cloud account, with HTTPS and redeploys on each push.
Since 2026
Free plan · Developer tools · Developers
- Zedmail
Transactional email API and SMTP relay for apps, run by a Canadian company that keeps all data and servers in Canada.
Since 2026
Free plan · Transactional email · Developers
- Reloop
An open-source email service for developers that sends app email and campaigns, run in their cloud or on your own server.
Free plan · Email marketing · Developers
- FreeResend
Self-hosted drop-in replacement for the Resend API that sends app email through Amazon SES for developers.
Since 2025
Free · Transactional email · Developers
- Unitpost
Sends app email and text messages such as receipts, login codes and newsletters through an API, SDKs or an AI agent.
Since 2026
Free plan · Email marketing · Developers
- useSend
Sends transactional and marketing email through an API or visual editor, billed by emails sent rather than contacts stored.
Free plan · Email marketing · Developers
- Appliku
Sets up and manages your own cloud server to deploy Django apps, with a dashboard, CLI and API.
Since 2021
Free plan · Developer tools · Developers
- SwiftWave
Lightweight self-hosted platform for deploying apps from git or Docker onto your own servers, with domains and SSL handled.
Since 2024
Free · Developer tools · Developers
- Recivo
Gives each of your app's users their own email address and passes incoming mail and attachments to your code by API or webhook.
Since 2025
Free plan · Transactional email · Developers