8 Best Real-Time Databases of 2026

1. 1

   Supabase

   A hosted Postgres platform with a Realtime service for Broadcast, Presence and Postgres Changes over WebSockets.

   9.0overall

   A hosted Postgres platform with a Realtime service for Broadcast, Presence and Postgres Changes over WebSockets.

   Best forApp builders who want live updates on top of a relational Postgres database with auth and storage in one project.

   Adoption data

   10 millionSupabase said in its Series F announcement that nearly 10 million developers build on the platform.

   Supabase, Supabase Series F (2026): “Nearly 10 million developers build on Supabase today, more than doubling since our last fundraising announcement eight months ago.”

   Supabase pairs a managed Postgres database with a Realtime service that offers three primitives: Broadcast for low-latency messages, Presence for online state and Postgres Changes for row-level change feeds. That mix covers chat, live dashboards, cursors and multiplayer state without a second datastore. Its Series F post says nearly 10 million developers build on Supabase, and the 2026 Stack Overflow survey puts it at 7.7% of database respondents, ahead of every other backend platform in this list. The Free plan includes 50,000 monthly active users and a 500 MB database; Pro starts at $25 per month with $10 of compute credits, 100,000 monthly active users and 5 million Realtime messages. Limits are documented per plan: 200 concurrent connections on Free, 500 on Pro and 10,000 on Pro without a spend cap or Team. The main gap for mobile apps is offline persistence, which Supabase leaves to the client. We compared documented features and published prices.

   Strengths

   • +Live updates sit on standard Postgres, so data stays relational and portable
   • +Free plan includes 50,000 monthly active users and a 500 MB database
   • +Pro includes 5 million Realtime messages and $10 of compute credits

   Limitations

   • −Pro caps Realtime at 500 concurrent connections unless the spend cap is removed
   • −Postgres Changes payloads are limited to 1,024 KB
   • −No built-in offline cache like the Firebase SDKs

   SummarySupabase is the strongest all-round pick for real-time apps that also need SQL, auth and storage. Plan connection limits early if you expect thousands of live users.

2. 2

   Cloud Firestore

   Google's document database for mobile and web apps with realtime listeners, offline support and multi-region replication.

   8.7overall

   Google's document database for mobile and web apps with realtime listeners, offline support and multi-region replication.

   Best forMobile and web teams that want realtime sync with offline caching and richer queries than a JSON tree.

   Adoption data

   4.8%In the 2026 Stack Overflow Developer Survey, 4.8% of respondents to the database question, or 582 developers, said they had done extensive work in Cloud Firestore.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “Cloud Firestore 582 4.8%”

   Cloud Firestore is the document database in Firebase and Google Cloud. Like the older Realtime Database, it pushes changes to every connected device, but it adds documents and collections, chained query filters with sorting, ACID transactions and automatic multi-region replication. Its SDKs cache the data an app is using, so a device can read, write, listen and query while offline and sync when it reconnects, which matters for mobile apps more than any other feature here. The 2026 Stack Overflow survey counts 4.8% of database respondents working in Firestore. Pricing is operation based: the free quota covers 1 GiB stored, 50,000 document reads and 20,000 writes per day, and the Standard edition then bills about $0.03 per 100,000 reads in the region shown on the pricing page. Realtime listeners bill one read each time a document in a listened result set is added or updated, so busy feeds need cost modeling. We compared documented features and published prices.

   Strengths

   • +Offline support is built into the mobile and web SDKs
   • +Daily free quota of 50,000 reads and 20,000 writes
   • +Richer queries than Firebase Realtime Database

   Limitations

   • −Listeners bill a read each time a document in the result set changes
   • −Costs scale with operations, which is harder to forecast for chatty apps
   • −Proprietary data model tied to Google Cloud

   SummaryFirestore is the best choice for mobile-first apps that need offline sync and live listeners. Model listener reads before launch, since every change in a result set is billed.

3. 3

   Convex

   A reactive TypeScript backend where query functions are realtime by default, with database, functions, search and file storage.

   8.6overall

   A reactive TypeScript backend where query functions are realtime by default, with database, functions, search and file storage.

   Best forTypeScript teams that want every query to stay live without writing subscription code.

   Adoption data

   2.5MConvex's website reports about 2.5 million weekly npm downloads of its package.

   Convex, Convex | All gas, no breakages (2026): “npm 2.5M weekly”

   Convex treats realtime as the default rather than an add-on. Its docs explain that Convex tracks the data each query function depends on and pushes fresh results to subscribed clients when that data changes, so React and other clients stay in sync without listeners or channels. Results are cached, and the docs say cached reads do not incur database bandwidth charges. The platform bundles a document database, server functions, crons, file storage, text and vector search and auth, all written in TypeScript, and the core is open source for self-hosting. Its homepage reports about 2.5 million weekly npm downloads. The Free and Starter plan costs $0 with 1M function calls, 0.5 GB of database storage and 20 GB-hours of action compute, then pay as you go; Professional is $25 per developer per month with 25M calls included. The trade-off is architectural: your backend logic lives in Convex functions. We compared documented features and published prices.

   Strengths

   • +No subscription code: clients rerun queries when their data changes
   • +Cached query reads are not charged for database bandwidth
   • +Free and Starter plan covers 1M function calls per month

   Limitations

   • −Backend logic must be written as Convex functions in TypeScript
   • −Smaller adoption base than Firebase or Supabase
   • −Business and Enterprise start at a $2,500 monthly minimum

   SummaryConvex is the cleanest developer experience for reactive web apps written in TypeScript. Choose it when you are happy to build the backend inside its function model.

4. 4

   Redis Cloud

   Managed Redis with in-memory data structures and pub/sub for very low-latency reads, writes and message fan-out.

   8.5overall

   Managed Redis with in-memory data structures and pub/sub for very low-latency reads, writes and message fan-out.

   Best forTeams that need a fast in-memory layer for live counters, leaderboards, sessions and pub/sub next to a primary database.

   Adoption data

   28.3%In the 2026 Stack Overflow Developer Survey, 28.3% of database respondents, or 3,414 developers, said they had done extensive work in Redis, the highest share of any database in this list.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “Redis 3,414 28.3%”

   Redis Cloud is not a client sync service like Firebase or Convex, but it is the default low-latency layer behind many realtime apps. It keeps data in memory for fast reads and writes and implements pub/sub through SUBSCRIBE and PUBLISH. The docs are clear that pub/sub uses at-most-once delivery, so a subscriber that disconnects misses messages; durable feeds need another delivery mechanism. Adoption is the strongest here: 28.3% of database respondents in the 2026 Stack Overflow survey worked extensively in Redis. Pricing is easy to start: a free 30 MB database, Essentials from $0.007 per hour, which Redis shows as $5 per month for the smallest size, and Pro from $0.014 per hour with a $200 minimum, active-active multi-region replication and up to 99.999% uptime. Your app server, not the browser, talks to Redis, so plan a WebSocket layer. We compared documented features and published prices.

   Strengths

   • +The most widely used database in this list among surveyed developers
   • +Essentials starts at about $5 per month
   • +Up to 99.999% uptime on Pro

   Limitations

   • −Pub/sub has at-most-once delivery, so offline clients miss messages
   • −No client SDKs that sync data straight to browsers or phones
   • −Pro has a $200 monthly minimum

   SummaryRedis Cloud is the best value for raw low-latency reads, writes and pub/sub fan-out. Pair it with a primary database and a socket layer, since it does not sync to clients by itself.

5. 5

   Firebase Realtime Database

   Firebase's original cloud JSON database that syncs data to every connected client within milliseconds.

   8.3overall

   Firebase's original cloud JSON database that syncs data to every connected client within milliseconds.

   Best forSimple apps with small, fast-changing state such as presence, chat and live counters.

   Adoption data

   4.2%In the 2026 Stack Overflow Developer Survey, 4.2% of database respondents, or 504 developers, said they had done extensive work in Firebase Realtime Database.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “Firebase Realtime Database 504 4.2%”

   Firebase Realtime Database is the simplest way on this list to get live data into an app: data lives in one JSON tree, and the docs say every connected device receives changes within milliseconds. Clients connect directly from iOS, Android, web, Flutter, Unity or C++, with Security Rules enforcing access, and the SDK persists data to disk so apps stay responsive offline. Limits are published: 200,000 simultaneous connections and about 1,000 writes per second per database, with more database instances to scale out. Pricing differs from Firestore because it charges for data, not operations: Spark is free with 1 GB stored, 10 GB of downloads per month and 100 connections, and Blaze charges $5 per GB stored and $1 per GB downloaded beyond that. In the 2026 Stack Overflow survey, 4.2% of database respondents used it. Google's own docs suggest Firestore for richer data models and queries, which is the main reason it ranks below. We compared documented features and published prices.

   Strengths

   • +Very low setup: clients read and write directly with no app server
   • +Billing is by storage and download, not per operation
   • +Offline persistence is built into the SDKs

   Limitations

   • −Single JSON tree with limited querying compared with Firestore
   • −About 1,000 writes per second per database before rate limiting
   • −Google itself points new apps with richer needs to Cloud Firestore

   SummaryFirebase Realtime Database is still a fast, cheap fit for presence, chat and other small live state. Pick Firestore instead when you need structured queries or higher scale.

6. 6

   MongoDB Atlas

   MongoDB's managed document database, with change streams for reacting to data changes in real time.

   8.3overall

   MongoDB's managed document database, with change streams for reacting to data changes in real time.

   Best forTeams on MongoDB that need server-side change feeds for notifications, live views and event-driven services.

   Adoption data

   19.0%In the 2026 Stack Overflow Developer Survey, 19.0% of database respondents, or 2,297 developers, said they had done extensive work in MongoDB.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “MongoDB 2,297 19.0%”

   MongoDB Atlas is a general document database rather than a dedicated sync engine, but change streams make it a common backbone for realtime features. The manual says change streams let applications subscribe to all data changes on a collection, a database or an entire deployment and react immediately, without tailing the oplog, and because they use the aggregation framework you can filter or reshape events. That suits notification services, live order views and cache invalidation, with the app server relaying events to clients. Adoption is broad: 19.0% of database respondents in the 2026 Stack Overflow survey worked extensively in MongoDB. The free cluster has 512 MB of storage, Flex clusters run from $0.011 per hour and cost between $8 and $30 for a month, and Dedicated starts at $0.08 per hour, shown as $56.94 per month. The gap for app builders is the client side: there is no browser sync SDK. We compared documented features and published prices.

   Strengths

   • +Change streams avoid tailing the oplog by hand
   • +Second-highest developer adoption in this list
   • +Flex tier is capped at $30 per month

   Limitations

   • −No client sync SDK for browsers, so live UIs need your own socket layer
   • −Change streams cover database events only
   • −Dedicated clusters start at $0.08 per hour, about $57 per month

   SummaryMongoDB Atlas fits teams already on MongoDB who want change feeds for server-side realtime logic. Add a WebSocket service to deliver those events to users.

7. 7

   Appwrite

   An open-source backend platform whose Realtime API streams events from databases, storage, auth and functions over WebSockets.

   8.1overall

   An open-source backend platform whose Realtime API streams events from databases, storage, auth and functions over WebSockets.

   Best forTeams that want an open-source, self-hostable backend with realtime events across all services.

   Adoption data

   half a millionAppwrite says more than half a million developers use its platform.

   Appwrite, Appwrite: The developer infrastructure platform (2026): “Over half a million developers scale with Appwrite”

   Appwrite is an open-source backend that bundles auth, databases, storage, functions, messaging and hosting, and its Realtime API lets clients subscribe to events from any of them over WebSockets. The docs say subscribed clients receive updates within milliseconds of a change, and every event is filtered through Appwrite's permission system, so users only see resources they can read. That makes it practical to stream document changes, file uploads and account events through one channel model. Appwrite reports more than half a million developers on its platform. The pricing page shows database compute that is serverless or dedicated, with dedicated tiers from $10 per month for 1 core and 1 GB, and $10 of database compute credits included each month; the plan prices themselves did not load in a fetchable USD form, so we marked pricing pending. The docs list subscription changes on a single WebSocket as a current limitation. We compared documented features and published prices.

   Strengths

   • +Realtime covers every Appwrite service, not only the database
   • +Users only receive events for resources they can read
   • +Free plan available, and the whole stack can be self-hosted

   Limitations

   • −USD plan prices did not load in a fetchable form, so our price check is pending
   • −Changing subscriptions reuses one WebSocket, which the docs list as a limitation
   • −Smaller ecosystem than Firebase or Supabase

   SummaryAppwrite suits teams that want realtime events across a whole open-source backend and the option to self-host. Confirm current plan prices on the vendor page.

8. 8

   Couchbase Capella

   A managed JSON database with SQL++, key-value access, search and App Services that sync data to offline-capable mobile and edge apps.

   7.6overall

   A managed JSON database with SQL++, key-value access, search and App Services that sync data to offline-capable mobile and edge apps.

   Best forEnterprises building mobile, retail or field apps that must keep working offline and sync when reconnected.

   Couchbase Capella is the managed version of Couchbase, a JSON database that combines key-value access, SQL++ queries and vector, full-text and geo search. Its realtime angle is edge sync: Capella App Services syncs data to Couchbase Lite running on phones, kiosks and edge devices, and Couchbase says those apps keep working offline and catch up when they reconnect. That is the strongest documented offline-first story here, aimed at retail, travel, gaming and other apps where connectivity drops. Each organization gets one free cluster with 8 GB and App Services, with no credit card required. Paid clusters bill per node: Basic from $0.15 per hour, about $110 per node per month, and Developer Pro from $0.35 per hour with up to a 99.99% uptime SLA on multi-node clusters. We could not find an independent adoption figure to cite, so adoption is scored conservatively. For simple web apps, node-based pricing costs more than usage plans. We compared documented features and published prices.

   Strengths

   • +Strongest documented offline-first mobile and edge sync in this list
   • +Free tier includes App Services for mobile sync
   • +Runs on AWS, Google Cloud and Azure

   Limitations

   • −Paid clusters are billed per node hour, so small apps pay more than on usage plans
   • −No independent adoption figure we could cite
   • −More setup than Firebase or Convex for a simple web app

   SummaryCouchbase Capella is the pick when offline-first sync to mobile and edge devices is the main requirement. Smaller web apps will find usage-priced options cheaper.

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