Heroku's free tier was discontinued in 2022 and paid plans now start at $5/dyno/month — with no included databases, storage billed separately, and costs that compound quickly as you add apps and workers. Self-hosted PaaS tools replicate the Heroku experience (Git push to deploy, automatic SSL, web UI, database provisioning) on a VPS you control, at a fraction of the cost.
Vercel Pro costs $20/month per team member — and that's before you add bandwidth overages, concurrency limits, or a second project. If you're running more than a handful of apps, the bill grows faster than your team. Self-hosting a deployment platform on a $3.50/month VPS lets you deploy unlimited apps, keep your code and environment variables off a third-party cloud, and pay a flat monthly rate that doesn't scale with your headcount.
Coolify and Dokploy both turn a VPS into a Heroku-style platform: push code, get a URL, forget about Nginx configs and SSL certificates. Both are Apache-2.0 licensed, both install with a single command, and both support Docker Compose deployments, Let's Encrypt TLS, Git webhooks, and database provisioning. The difference is scale, maturity, and complexity tolerance.