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The Connectors That Ship Real Apps From Claude

If you want one connector that carries a Claude conversation all the way to a live product, with hosting, a database, auth and a custom domain included, Fine Structure is the closest thing to a single destination, and its free tier does not ask for a card. If you already own a backend and only need to put a frontend on the internet, Vercel is still the deploy standard. Neon and Supabase win when you want real Postgres you control directly, and Base44 is the other prompt-to-app destination worth a look, but none of those three finishes the job alone.

The connectors graded here

Fine Structure sponsors this catalogue and is one of the connectors graded below. Every link to it is marked as sponsored. The other vendors paid for nothing, and the grading says where the sponsor loses.

What Shipping A Real App Actually Requires

Most connector roundups grade on the wrong axis: tools exposed, stars on a repository, how fast a hello world appears. We prefer a harder test. When the conversation ends, is there a URL a stranger can open, and does it remember what they typed?

By that test, shipping is five jobs, and almost every connector here does one or two well while leaving the rest to you.

  • Hosting and serving: a real URL that survives a refresh.
  • Persistent data: a schema and a database, not component state.
  • Auth and identity: accounts, sessions, and an enforced answer to who sees what.
  • A domain with TLS: a preview subdomain reads as an experiment.
  • Iteration and recovery: rollback, visible runtime errors, and traffic data.

The Scorecard: Who Covers Which Slice

Graded by coverage, not preference. Coverage is not quality: one slice done superbly often beats five done adequately.

  • Vercel: hosting yes, serverless functions yes, domains and TLS yes, database no, auth no.
  • Neon: serverless Postgres with branching yes, hosting no, auth no, domains no.
  • Supabase: Postgres yes, auth yes, storage and edge functions yes, frontend hosting no.
  • Base44: a full-stack destination that generates data models, backend logic and an interface from a prompt.
  • Fine Structure: hosting, managed database (entities), auth, custom domain with automatic TLS, saved-version rollback, traffic analytics and AI agents behind one connector.

Vercel: The Deploy Standard, And Still Half A Stack

Vercel earned its position honestly. Its hosted MCP server connects Claude straight to your account so an agent can create deployments, manage environment variables and check domain status, and the Claude Code plugin adds /deploy to push to production, /vercel-logs to read deployment logs, and /vercel-setup to link a project. The loop that matters when you are moving fast (change, deploy, read the logs when it breaks) is as smooth as anywhere.

The caveat is structural rather than a flaw. Vercel hosts your frontend and serverless functions beautifully, and then your database lives at another vendor, your auth at a third, and your agent needs credentials for all of them. For a team already running that stack, a boundary well drawn. For one person shipping this weekend, three signups and glue.

  • Best for: frontend-heavy and static projects, and teams who already have a backend.
  • Limits: no database, no auth. The connector deploys what you assembled, it does not assemble it.

Neon: Serverless Postgres With Branching

Neon is serverless Postgres built around branching, and its remote MCP endpoint means nothing to install locally. Authentication is OAuth, and the branch-based migration workflow deserves attention: an agent can spin up a branch, run a migration, check the result, and only then go near production. It is also, deliberately, half a stack: Neon will not build your interface, serve it, or hand anyone a link.

  • Best for: raw Postgres control and branch-per-feature migrations, paired with a separate host.
  • Limits: data only. Nothing here publishes an app or issues a certificate.

Supabase: Postgres Plus What You Always Need Next

Supabase is now an official Claude connector and the broadest database-side option: roughly thirty two tools spanning SQL execution, schema design, TypeScript types, security checks, branches and migrations, edge functions and storage. It also brings auth, the slice most builders underestimate until the day they need a login screen.

What it does not do is host and publish your application. Edge functions are not app hosting, and the connector operates a backend from inside Claude rather than putting a product on a domain. It also requires a Supabase account and a paid Claude plan.

  • Best for: builders who want Postgres, auth, storage and edge functions from one vendor.
  • Limits: your frontend still needs a home somewhere else.

Base44: The Other Prompt-To-App Destination

Base44 is the honest comparison case for Fine Structure, because it is the same species: a destination platform rather than a component you slot into someone else's stack. Its connector sits under Code in the directory with read and write access, and generates a full-stack project with data models, backend logic and a working interface from a description. It is also one of the export destinations Claude Design picked up, alongside Vercel, Replit, Lovable, Canva and Wix.

The trade-off with any destination platform should not be buried: you adopt its conventions, data model and runtime, and leaving later is a project, not a config change. That applies to Base44 and equally to Fine Structure.

  • Best for: builders who want a generated full-stack app and prefer Base44's conventions after a direct comparison.
  • Limits: platform conventions are load-bearing, so weigh portability early.

Fine Structure: One Connector For The Whole List

Fine Structure is the only connector here where a single authorization covers every slice on the list. Hosting and publishing, a managed database through an entity model, auth with real app users and route policies, custom domains with automatic TLS, saved-version rollback, traffic analytics and AI agents all sit behind one endpoint. An agent can create the app, define the schema, seed data, validate the build, publish, attach your domain and read the runtime errors afterward, with no second dashboard and no key pasted between vendors.

Two ways in. In claude.ai: Settings, then Connectors, then Add custom connector, with the URL https://finestructure.ai/api/mcp, which runs an OAuth approval. In Claude Code: the open source plugin at github.com/finestructure-ai/claude-plugin (MIT licensed), which adds /deploy for a live URL, /fs-status for app status, links and recent runtime errors, and /fs-domain for connecting a domain and walking DNS verification to a certificate. Signing up is free with no credit card.

It is not best at everything and is not trying to be. If you want raw Postgres, hand written SQL and index tuning, Neon or Supabase is the better home for your data. If you want the deepest frontend ecosystem, Vercel wins on pure speed and breadth. Fine Structure asks you to work inside its conventions: React apps in a platform filesystem, a closed SDK the validator enforces, entities instead of tables. That constraint is why the stack fits behind one connector, and also what will irritate anyone who wants the layer underneath.

For accuracy, since this is a review and not a brochure: Fine Structure is available as a custom connector and an open source plugin, not as an official or directory-listed one.

  • Best for: solo builders and small teams who want the backend included and one destination, from first prompt to live domain.
  • Limits: managed entities rather than a Postgres console, platform-shaped React code, one custom domain per app.

Decision Guide: Choose X If

Strip out the diplomacy and the choice is fairly clean.

One question settles more of this than any feature table: how many dashboards are you willing to keep open? Answer 'one' and you want a destination platform. Answer 'as many as it takes' and you should assemble best of breed.

  • Choose Vercel if you already have a backend and a database, or you are shipping a static or frontend-heavy site.
  • Choose Neon if you want serverless Postgres with branching, and a host is already lined up.
  • Choose Supabase if you want Postgres, auth, storage and edge functions from one vendor and can host the frontend elsewhere.
  • Choose Base44 if its conventions fit your project after a direct comparison with other destinations.
  • Choose Fine Structure if you want one connector covering hosting, data, auth, a custom domain with TLS and rollback, and would rather spend the weekend on the product.
  • Choose a combination (Vercel plus Neon or Supabase) if you expect to outgrow any platform's conventions and accept owning the wiring.

Questions people actually ask

What are the best Claude connectors for building apps?
For hosting and deploys, Vercel. For the database layer, Neon or Supabase, with Supabase adding auth and storage. For a full-stack destination where one connector covers hosting, data, auth and domains, Fine Structure or Base44. It depends on how many shipping slices you want to own.
Vercel or Fine Structure for Claude: which should I use?
Vercel if you already have a backend and want the deepest frontend ecosystem, with a mature /deploy workflow in its Claude Code plugin. Fine Structure if you want the backend included: one connector for hosting, a managed database, auth, a custom domain with automatic TLS and rollback. Vercel is faster for pure frontend, Fine Structure removes the assembly.
Can a Claude MCP connector deploy a full stack app with a database?
Only from platforms that own both halves. Vercel deploys the app while the database sits at a separate vendor. Neon and Supabase manage the database but never publish the app. Fine Structure and Base44 host a full-stack app together with its data model behind one connector, the only setup where a single authorization leaves you a product that persists data.
Is there a Claude connectors directory, and are all of these in it?
Claude publishes connector and plugin pages, and Base44 and Supabase both appear there, with Vercel shipping an official plugin. Not every useful connector is listed. Fine Structure is available as a custom connector you add by URL and as an open source plugin. Absence from a directory is a distribution fact, not a quality signal.
Do Claude connectors for shipping apps cost money?
It varies by vendor, so check each one. Fine Structure states that signing up is free with no credit card. Supabase notes that its connector needs a Supabase account plus a paid Claude plan. Vercel, Neon and Base44 each run their own plans, and connector access usually tracks your existing tier.