DeepSpace is a full-stack SDK and hosting platform for real-time React and TypeScript apps. One npm package, deepspace, includes a real-time database, sign-in, presence, collaborative editing, file storage, and Stripe payments. One command, npx deepspace deploy, puts the frontend and backend live at <name>.app.space.

DeepSpace is designed for AI coding agents. New projects include an agent skill, and CLI commands can return JSON. Permission checks, identity verification, and payment flows are handled inside the SDK, so agents do not rewrite them for each project.

Firebase is Google's app development platform. It includes two NoSQL databases (Cloud Firestore and Realtime Database), authentication, file storage, Cloud Functions, and web hosting, including App Hosting for Next.js and Angular. It also offers analytics, crash reporting, and messaging, all running on Google Cloud.

As of October 2026, Firebase also offers SQL through Firebase SQL Connect, which is backed by Cloud SQL for PostgreSQL. Firestore has an Enterprise edition with a MongoDB compatibility mode. Firebase has two plans: the no-cost Spark plan and the pay-as-you-go Blaze plan.

The main difference is how the pieces fit together. DeepSpace is one package with one data model, one permission system, and one deploy. Firebase is a set of products, each with its own configuration and quotas, and its databases use different security rule syntaxes.

Firebase covers far more products, especially for native mobile apps, while DeepSpace covers a real-time web app from data to deploy.

Both can put a complete web app live. DeepSpace has less to configure. npx deepspace deploy builds the frontend, provisions the backend, and puts the app live at <name>.app.space in one step. Auth and the database need no extra setup. To take payments, you connect a Stripe account once.

A full Firebase app usually spans several products: a database, its security rules, Cloud Functions, and a hosting product, each set up separately. As of October 2026, Cloud Functions and App Hosting require the Blaze plan. Firebase's hosting is mature. Hosting serves static sites with a no-cost tier, and App Hosting builds and serves Next.js and Angular apps from GitHub commits.

Both are real-time by default. They differ in what is prebuilt and in how real-time usage is billed. Firestore snapshot listeners push document changes to clients. Realtime Database supports up to 200,000 simultaneous connections per database on Blaze and 100 on Spark, as of October 2026. Both are used at very large scale.

Firebase provides data sync. Presence, live cursors, and collaborative text editing are yours to build on top. DeepSpace includes presence, live cursors, and collaborative text built on Yjs, and a Tiptap editor and a shared canvas are available as add-on features.

Firestore also bills a document read each time a listener receives an added or updated document (as of October 2026), so the cost of a busy real-time app grows with activity. It is worth modeling before you commit a collaborative workload to it.

Both include authentication. Firebase offers more sign-in methods. DeepSpace ships sign-in with Google and GitHub, with sessions handled by the platform. Permissions are role-based rules, such as viewer, member, and admin, declared next to each collection's schema and enforced on the server.

Firebase Authentication supports email and password, phone, anonymous, and social providers such as Google, Apple, Facebook, and GitHub. As of October 2026 it includes 50,000 free monthly active users. SAML, OIDC, and MFA require the upgrade to Identity Platform, and phone sign-in is billed per SMS. Authorization uses Security Rules: Firestore and Cloud Storage share one rules language, and Realtime Database uses a separate JSON-based syntax. The rules are flexible, and keeping them correct across products takes care and testing.

DeepSpace has payments built in. Firebase does not have a payments product. In DeepSpace you declare subscription plans and one-time products in code, and they sync to Stripe when you deploy. Hooks and a pricing table component handle checkout. Server helpers check subscriptions and handle refunds and cancellations.

On Firebase, payments are an integration you build: Stripe webhooks in Cloud Functions, entitlement documents, and the Security Rules that protect them. A third-party Stripe extension covers part of this, but Firebase Extensions is deprecated and shuts down on March 31, 2027.

Both support coding agents. A DeepSpace project includes an agent skill, and the CLI can return JSON for scripting. Sign-in, permission checks, and payment flows are handled inside the SDK, so an agent does not rewrite them for each project.

Firebase has an MCP server that works with agents such as Claude Code and Cursor. It lets an agent manage projects, work with Firestore and Auth, check security rules, and deploy, and Firebase publishes agent skills to go with it. Google's Genkit and Firebase AI Logic are for building AI features into your app. Firebase Studio, its browser-based AI workspace, closed to new signups in June 2026 and sunsets in March 2027. With Firebase, an agent coordinates more products and rule files per app.

Both have free plans. DeepSpace is free to start building and deploying, and paid plans add more deployed apps and usage as you scale.

Firebase's no-cost Spark plan is generous. As of October 2026, Firestore includes 50,000 reads and 20,000 writes per day, Auth includes 50,000 monthly active users, and Hosting includes 10 GB of storage. If a Spark project goes over a no-cost quota, that product is shut off until the quota resets or you upgrade. Cloud Functions require Blaze. On Blaze you pay per operation at published, region-based rates. That makes costs precise to audit, and harder to predict for read-heavy real-time apps.

Choose Firebase when you are building native mobile apps. Its iOS and Android SDKs, Crashlytics, Cloud Messaging, and analytics have no DeepSpace equivalent, since DeepSpace targets web apps. Firebase is also the better fit when you need Google Cloud integration, SQL or MongoDB-compatible options, very large scale, or products like Remote Config and A/B Testing.

Choose DeepSpace when you are building a real-time, collaborative web app and want the data model, permissions, payments, and hosting on one platform.