Writing and content decision
Substack
A single developer can build a usable newsletter + paid-subscription stack and host media, but Substack's discovery network and production-scale media/search infrastructure are durable advantages that you won't replicate; paying Substack remains reasonable if you value built-in audience and scale.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need - the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship. All Substack alternatives, with the arithmetic →
What a replacement has to do
- Write long-form posts -> publish web post + send as email -> accept paid subscriptions -> host media (audio/video) and show discovery for readers
What it still won’t have
- Substack Network built-in discovery and cross-publication recommendations
- Scale and infrastructure for large media hosting, streaming, and podcast distribution
- Built-in audience/referral mechanics (leaderboards, referral rewards)
- Integrated native features such as AI text-to-speech, live streaming, and clipping tools
- Polished analytics and subscriber lifecycle automations at Substack scale
What remains hard
- Network effects
Substack Network (built-in discovery network across all Substack publications)
- Infrastructure at scale
Search (Elasticsearch + semantic/embedding search across publications, posts, and profiles)
First-year cost
No published price
Substack does not publish a price we could read, so there is nothing to compare against. What building costs is below.
Money you would actually spend
Time you would spend
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What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal Substack-like publishing platform using Next.js + PostgreSQL (Supabase optional) + S3-compatible storage and a managed search (Elasticsearch or Algolia). Implement: 1) a TipTap/ProseMirror-based rich text editor with drafts, scheduling, and post templates; 2) an email pipeline that renders posts to responsive HTML, sends via a transactional email provider, tracks opens/clicks, and supports one-click unsubscribe; 3) Stripe integration for paid subscriptions, with gated content handling and subscriber records in Postgres; 4) media upload and serving (images, audio files) plus generation of a podcast RSS feed for episodes; 5) a basic discovery/search index (title, body, tags, author) and a simple recommendations feed based on tag matching. Out of scope: full network discovery engine, large-scale live streaming, advanced AI features, and federated social Notes. Include input validation, error handling, CI tests for API endpoints, and scripts to deploy to a managed cloud (VPS or Cloud Run).
How we checked
How the score was reached
- Pay verdict base20
- An open-source build was found+5
- 3 cited sources+3
- Hard moats found in the evidence-6
- Evidence score22
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 3
Every page the run actually retrieved.
- official productSubstack (homepage)
- official productSubstack features
- open sourceNotifuse/notifuse
Integrity checks
What held up, and what did not.
