Open-Source Newsletter Software
Own Your Subscribers and Your Data

Hyvor Post is open-source newsletter software. You can read every line of the code, export your whole list whenever you like, and send without open or click tracking.

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Read the code behind your newsletter

The whole Hyvor Post codebase is public on GitHub. You can see how subscribers are stored, how emails are built, and what happens when you hit send, before you trust it with your list.It's released under the AGPLv3 license, so you're free to use, study and change it. The backend is PHP (Symfony), the Console and signup form are SvelteKit, and the data lives in PostgreSQL.

Browse the Source Code

Your subscriber list stays yours

You can download your full list as a CSV file at any time from Console → Tools → Export. Each row has the email, status, subscribe date, source and any metadata fields you've added.Moving in works the same way. Import a CSV and map its columns to lists, subscribe dates, IP addresses and your own fields. If your move is bigger, our support team can do it for you.

Importing Subscribers

Sent without a third-party email service

Most newsletter tools hand your list to an outside email provider to deliver it. Hyvor Post sends every issue through Hyvor Relay, an email service we built ourselves for this reason. Relay is open source under the AGPLv3 too.There's no open or click tracking either. No pixels, no rewritten links, and no hidden setting to turn them back on. Your readers get the email and that's it.

Explore Hyvor Relay

Connect it to your own tools

The Console API is the same API the Console runs on. You can add and update subscribers, manage lists, create and send issues, and start subscriber exports over HTTP.Each API key only gets the scopes you pick, so a script that syncs signups from your app can't send an issue or delete your newsletter.

Console API Docs

Frequently asked questions

It's a newsletter platform whose source code is public. Anyone can read how it stores subscribers, builds emails and sends them, and the license lets you change and run the code yourself. For you, it means you can check what the software does with your list instead of taking it on trust.

Hyvor Post is released under the GNU Affero General Public License v3 (AGPLv3). You can use, study and change the code. If you modify it and let others use your version over a network, the AGPLv3 asks you to share those changes under the same license. The full source is on GitHub.

Not in a supported way yet. The code is all public, but a few pieces are still in progress, like the OIDC sign-in setup and the self-hosting docs. You can follow the work on the GitHub repository. Until then, the cloud version at post.hyvor.com is the way to use Hyvor Post.

Export a CSV from your current platform and import it at Console → Tools → Import. You can map emails, lists, subscribe dates, IP addresses and your own metadata fields. For bigger moves, our support team can handle the migration for you. See Importing Subscribers.

Yes. Go to Console → Tools → Export and download your list as a CSV file. It has each subscriber's email, status, subscribe date, source and metadata. You can also create exports from the Console API.

No. There's no open or click tracking, and no hidden setting to turn it on. Emails are sent through Hyvor Relay, our own open-source email service, so your list isn't shared with a third-party sender.

Open an issue on the GitHub repository. For questions, there's the community forum. If you want to send a pull request, hyvor/dev explains how to set up the development environment.

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