Heroku alternative for SaaS custom domains
An evidence-based comparison of Heroku and subdomain.to for connecting customer-owned domains, managing certificates and routing HTTPS traffic.
Reviewed · Sources checked against first-party documentation
Is subdomain.to a good Heroku alternative?
Yes, when the job is specifically to connect customer-owned domains to an existing SaaS application. Heroku is the practical option when the application already runs there and custom domains should follow the Heroku app. Its Automated Certificate Management is included and the Platform API can manage domains. subdomain.to is the alternative when hosting must remain portable, domains need a dedicated customer-facing lifecycle or many tenant hostnames should route to an origin outside Heroku. Heroku attaches custom domains to apps and uses Automated Certificate Management to issue and renew Let’s Encrypt certificates. Domain operations are available through the CLI and Platform API, while Heroku routing sends the hostname to the selected app.
The products are not identical. This page compares only the overlapping custom-domain job; it does not score unrelated hosting, CDN, registrar or infrastructure features as if they were interchangeable.
Heroku vs subdomain.to
“Different” is not automatically worse. The right choice depends on whether you need a broader platform, direct infrastructure control or a focused custom-domain layer.
Product and pricing information reviewed July 30, 2026. Confirm current contractual terms with each vendor before purchasing.
Heroku in three verifiable facts
The comparison uses public, first-party material rather than review-site scores or inferred capabilities.
Certificate service
Automated Certificate Management
Certificate cost
Included with Heroku applications
Automation
CLI and Platform API domain resources
Compare the cost boundary, not one headline number.
Heroku states that ACM is included for all applications. The meaningful total is therefore the dyno, data and platform cost of the hosted app.
For a fair total-cost comparison, include implementation time, bandwidth or compute, certificate recovery, monitoring, support tooling and the cost of changing providers later. See the build-versus-buy model.
Where Heroku is strong
Heroku attaches custom domains to apps and uses Automated Certificate Management to issue and renew Let’s Encrypt certificates. Domain operations are available through the CLI and Platform API, while Heroku routing sends the hostname to the selected app.
- Free automated certificate issuance and renewal for Heroku apps.
- Domain operations available in the Platform API and CLI.
- Simple operational fit for teams already using Heroku.
- One platform owns runtime routing and TLS.
What your team still owns
These are scope differences to evaluate, not claims that the competitor is unsuitable.
- 01Custom domains are attached to a Heroku application.
- 02A customer-facing onboarding widget and granular subsystem state model are not the primary abstraction.
- 03Moving the workload later also changes the domain delivery path.
Choose from your operating constraints
A useful comparison names the conditions under which either product wins.
Choose Heroku when…
- The production application is already on Heroku.
- Included ACM satisfies the certificate requirement.
- Your team wants domains managed by the same platform as dynos.
Choose subdomain.to when…
- The application is not on Heroku or may move between hosts.
- Many domains need one purpose-built onboarding and support model.
- Signed webhooks and an embedded widget reduce product work.
Moving from Heroku without a DNS cliff
Run both paths during the transition. A domain move combines DNS propagation, certificate readiness and application routing; deleting the old route first removes your safest rollback.
- 01
Inventory
List Heroku app domains, DNS targets and ACM status before changing anything.
- 02
Prepare
Prepare the replacement HTTPS origin and confirm it resolves the tenant from forwarded hostname data.
- 03
Cut over
Register and activate domains, update DNS and only remove Heroku mappings after the cutover is stable.
How this comparison was produced
subdomain.to publishes this page and is therefore not a neutral review marketplace. We compare the shared customer-domain workflow, acknowledge where Heroku is stronger, cite first-party product documentation and avoid ratings we did not collect. subdomain.to claims are checked against the implemented application and public pricing page.
We review pricing, scope and source links quarterly or after a material product announcement. If a public fact cannot be verified, it is described as plan-dependent or omitted. Send corrections to hello@subdomain.to.
Heroku alternative FAQ
Short answers for engineering, product and procurement teams.
Does Heroku charge extra for automatic certificates?
Heroku states that Automated Certificate Management is included for all applications. Normal Heroku application and service charges still apply.
Can Heroku domains be automated?
Yes. Heroku exposes domain resources in its Platform API and provides CLI commands for domain and certificate management.
Why use a separate domain layer with a Heroku origin?
It can make customer-domain onboarding portable and product-specific. The origin must remain publicly reachable over an accepted HTTPS port.
How current is this comparison?
It was last reviewed on July 30, 2026 against the official product and documentation links above. Vendor plans and features can change, so verify contractual details before purchase.