---
title: "Letterhearth: a paid newsletter for an independent writer"
author: "@chris"
author_url: https://elements.dev/users/chris
published: 2026-09-30T22:01:08.798Z
url: https://elements.dev/demos/8l3w567l/letterhearth-a-paid-newsletter-for-an-independent-writer
kind: post
format: article
---

# Letterhearth: a paid newsletter for an independent writer

by [@chris](https://elements.dev/users/chris) · 2026-09-30

## Description

Free or $8 a month subscriptions by card, a teaser on paid posts, and markdown posts the writer schedules and emails.

Letterhearth needed free and paid subscriptions billed monthly by card, scheduled posts that go out by email, a teaser for readers who are not paying, one-click unsubscribe, and live counts for the writer. Each of those is a part of Elements, so the agent spent its 22 minutes on the newsletter itself.

**What Elements gave the app**

- **Live counts and revenue.** Subscribers are a LiveTable, so the writer's free and paid counts and monthly revenue move the moment a reader subscribes or upgrades.
- **Monthly subscriptions.** Subscribing, upgrading and cancelling are `@rpc` calls, and paid plans go through Stripe at $8 a month. The return page and Stripe's webhook record a new subscription once. Until a Stripe key is added, a built-in test checkout takes the payment through the same code, and in production the app registers its own webhook.
- **Posts on a schedule.** A cron schedule checks every minute for posts whose time has come and queues one email job per reader, so a failed send retries alone. Paid posts go in full to paid readers and as a teaser to everyone else.
- **One-click unsubscribe.** Every email carries the headers mail clients turn into an unsubscribe button, and the app answers that button directly.
- **Data from SQL files.** Migrations define the newsletter and seed the writer, six posts (three paid), five free readers and three on complimentary paid plans.
- **Sessions for readers and the writer.** Readers are signed in when they subscribe and later by an emailed link, and every writer page shares one guard on the writer's role.

**What the project server gave the agent**

The project server runs alongside the agent and answers as soon as a file is saved: it type-checks the templates, TypeScript and SQL, applies migrations and reruns the tests, so every question came back right away and the agent kept building.

**What shipped**

The app type-checks with zero errors and all 57 tests pass. Every page works on desktop and phone. A real sandbox payment went through Stripe end to end.