Jets
Built into every app
Jets
Built into every app
Unified apps
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.
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
Firebase: Partly built in
Apps in one Firebase project share sign-in. Separate projects have separate users.[3]
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
Firebase: Not offered
Projects reach each other over HTTP, with credentials you manage.[2]
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
Firebase: Not offered
There is no MCP server for your users, so there is none to connect.[1]
Built for agents
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.
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
Firebase: Not offered
The Firebase MCP server runs on a developer's computer and manages Firebase projects with the developer's Firebase sign-in.[1]
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
Firebase: Not offered
There is no MCP server for your users.[1]
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
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
Substrio includes every one of these services in one platform. Firebase includes 6 of the 17 capabilities on this page.
Substrio: Built in
Collections you can query with SQL or JavaScript, on the same records. Read the docs
Firebase: Built in
Cloud Firestore.[2]
Substrio: Built in
Passwords, passkeys, email codes, eight sign-in providers, roles, and permissions. Read the docs
Firebase: Built in
Firebase Authentication.[2]
Substrio: Built in
Ready-made templates and one API call to send. Standard sends from your own domain. Read the docs
Firebase: Partly built in
Sign-in email only. Email from your app needs an outside provider, through the Trigger Email extension.[6]
Substrio: Built in
Vector maps, address autocomplete, geocoding, and IP location. Read the docs
Firebase: Separate service
Google Maps Platform, billed separately.[7]
Substrio: Built in
Functions run beside your data, with routes, schedules, and triggers. Read the docs
Firebase: Built in
Cloud Functions for Firebase.[2]
Substrio: Built in
File storage with public and private access. Read the docs
Firebase: Built in
Cloud Storage for Firebase.[2]
Substrio: Built in
Realtime messages and live connections are part of every plan. Read the docs
Firebase: Built in
Realtime listeners in Firestore and the Realtime Database.[2]
Substrio: Built in
Your site launches at your-app.substrio.com on Free. Standard adds custom domains with TLS certificates. Read the docs
Firebase: Built in
Firebase Hosting, with custom domains.[2]
Substrio: Built in
Balances and transfers are recorded in a built-in ledger. Read the docs
Firebase: Not offered
There is no ledger.[2]
One bill
Egress costs $0 on every Substrio plan, and every service is part of one monthly price.
Substrio: Built in
Egress costs $0 on every plan. Read the docs
Firebase: Partly built in
Hosting egress past the daily allowance is billed at $0.15/GB.[8]
The same app costs $19/month on Substrio Pro and $685.88/month on Firebase and Google Maps. That's 36× 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
Every Firebase line on this page links the page it comes from, checked on October 29, 2026.
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