One login across every app
Substrio: Built in
A person signs in once with Substrio, and every app connected to that sign-in lets them in without a password. Read the docs
Vercel: Separate service
Shared sign-in comes from a separate provider.[4]
Unified apps
Build one app.Connect them all.
Every app you build on Substrio can work with every other one. Your users sign in once and move between your apps as the same person. One app uses another app's data and functions directly, with no HTTP and no shared code, and one agent works across all of them. You choose what each app shares.
Apps that use each other
Substrio: Built in
One app can use another app's functions and queries directly, with no HTTP and no shared code. You choose what each app shares. Read the docs
Vercel: Not offered
Projects reach each other over HTTP.[7]
One agent across your apps
Substrio: Built in
An agent signs in once, at one app, and uses the tools of every app connected to it, as the same person. Read the docs
Vercel: Not offered
An MCP server that spans your apps is code you write and deploy.[2]
Built for agents
Agents build it.Agents can use it.
Every app on Substrio is an MCP server. Your agent builds the app, and your users' agents can use it with the permissions of their login.
An MCP server in every app
Substrio: Built in
Every app you launch is an MCP server. Each route you write becomes a tool on the first deploy. Read the docs
Vercel: Separate service
An MCP server for your app is code you write and deploy, for example with mcp-handler.[2]
Your users' agents
Substrio: Built in
Your users connect their agents with OAuth or an agent token. Each agent works with that user's permissions and nothing more. Read the docs
Vercel: Separate service
Your users' agents need an MCP server and an OAuth setup that you build.[2]
Your agent builds the whole app
Substrio: Built in
One connection gives your agent every operation, from data and functions to email, files, the site, and custom domains. Read the docs
Sandbox, then go live
Substrio: Built in
Every version runs in a sandbox first. Going live backs up your data, and one call rolls back. Read the docs
Everything built in
Everything built in.Nothing to piece together.
Substrio includes every one of these services in one platform. Vercel includes 3 of the 17 capabilities on this page.
Database
Substrio: Built in
Collections you can query with SQL or JavaScript, on the same records. Read the docs
Vercel: Separate service
Postgres, Redis, and other databases come from Marketplace providers such as Neon and Upstash.[3]
Sign-in and users
Substrio: Built in
Passwords, passkeys, email codes, eight sign-in providers, roles, and permissions. Read the docs
Vercel: Separate service
Sign-in comes from a separate provider.[4]
Email to your users
Substrio: Built in
Ready-made templates and one API call to send. Standard sends from your own domain. Read the docs
Vercel: Separate service
Email comes from a separate provider, such as Resend.[4]
Maps and geocoding
Substrio: Built in
Vector maps, address autocomplete, geocoding, and IP location. Read the docs
Vercel: Separate service
Maps come from a separate provider, such as Mapbox.[4]
Functions
Substrio: Built in
Functions run beside your data, with routes, schedules, and triggers. Read the docs
Vercel: Built in
Vercel Functions.[7]
Files
Substrio: Built in
File storage with public and private access. Read the docs
Vercel: Built in
Vercel Blob.[3]
Realtime
Substrio: Built in
Realtime messages and live connections are part of every plan. Read the docs
Vercel: Partly built in
WebSockets run on Vercel Functions. Sharing messages across connections needs an outside store, such as Redis.[5]
Site hosting
Substrio: Built in
Your site launches at your-app.substrio.com on Free. Standard adds custom domains with TLS certificates. Read the docs
Vercel: Built in
Vercel hosting, with custom domains.[7]
Ledger
Substrio: Built in
Balances and transfers are recorded in a built-in ledger. Read the docs
Vercel: Not offered
There is no ledger.[3]
One bill
One platform.One simple bill.
Egress costs $0 on every Substrio plan, and every service is part of one monthly price.
Egress
Substrio: Built in
Egress costs $0 on every plan. Read the docs
Vercel: Partly built in
Data transfer past the plan's allowance is billed.[7]
The same app costs $19/month on Substrio Pro and $315.25/month on Supabase, Vercel, Resend and Mapbox. That's 16× the price.
The app: 10 GB of data, 50,000 users, 30,000 emails, and 250 GB of egress a month. Every price is a list price, checked on October 27, 2026.
Sources
Check every line.
Every Vercel line on this page links the page it comes from, checked on October 29, 2026.
One platform.Every app connected.
Start free with no credit card and no time limit. Launch on Free, then grow with Standard for just $9/month.