backend-as-a-service (BaaS)
Instant is a realtime app backend offering auth, permissions, storage, presence, relational queries, offline caching, and optimistic multiplayer updates via JS/React SDKs.
Solves the same problem with a different architecture or at a different layer. Expect to rewrite the integration.
Choose it for Postgres/SQL, proven infrastructure, and server-side control; it lacks Instant's client-side offline and local-first sync model.
The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.
Choose it for a self-hostable multi-component backend with admin console and functions; heavier runtime and no client-side offline query engine.
Appwrite® - complete cloud infrastructure for your web, mobile and AI apps. Including Auth, Databases, Storage, Functions, Messaging, Hosting, Realtime and more
Choose it when you want a cloud-functions-centric backend platform with a hosted console; it doesn't offer Instant's live client queries or presence.
Laf is a vibrant cloud development platform that provides essential tools like cloud functions, databases, and storage solutions. It enables developers to quickly unleash their creativity and bring innovative ideas to life with ease.
Choose it when you want a lightweight backend embedded in Next.js/Remix/etc.; it is Supabase-like but lacks Instant's local-first realtime model.
Lightweight Firebase/Supabase alternative built to run anywhere — incl. Next.js, React Router, Astro, Cloudflare, Bun, Node, AWS Lambda & more.
Choose it for a Postgres BaaS with an AI/MCP gateway; it targets agent tooling rather than client-embedded realtime/offline sync.
Open-source backend-as-a-service. Postgres, auth, storage, functions, AI gateway, MCP.
Choose it for a single Go binary with Auth/DB/Storage and realtime; simpler deployment but no built-in optimistic/offline cache.
Open Source realtime backend in 1 file
Choose it when your AI agent needs a full-stack backend with compute and AI gateway; it is agent-oriented, not a client-side realtime sync SDK.
The all-in-one, open-source backend platform for agentic coding. InsForge gives your coding agent database, auth, storage, compute, hosting, and AI gateway to ship full-stack apps end-to-end.
Choose it for a GraphQL-first Postgres/Hasura backend with auth and functions; it does not give Instant's offline and presence features.
The Open Source Firebase Alternative with GraphQL.
Choose it if you already run or prefer a self-hosted Node/MongoDB Parse stack; it is actively maintained but has a server-centric API.
Parse Server for Node.js / Express
Choose it for a Rust/SQLite single-executable with MCP and realtime subscriptions; no optimistic offline client-side queries like Instant.
An open, sub-millisecond, single-executable Firebase alternative with type-safe APIs, built-in WebAssembly runtime, realtime subscriptions, auth, MCP and admin UI built on Rust, SQLite (PG) & Wasmtime.
Choose it for a self-hosted schema-driven application server with automation/integrations; it is more server-side tooling than client-sync backend.
Self-hosted application server for schema-driven APIs, identity, files, automation, integrations, realtime, metering, and protocols.
An earlier or more limited way to do the job. Still the right call when you need something small, proven, or CPU-only.
Use it for an older self-hosted Firebase/Parse-compatible realtime backend; it works but is less maintained and lacks modern offline features.
Realtime JavaScript Backend.
Use it for a historical RethinkDB-powered Firebase-style realtime JS backend; it is stale and lower-level than Instant.
Horizon is a realtime, open-source backend for JavaScript apps.
Choose it for a realtime game backend with matchmaking and leaderboards; it is narrower and game-specific rather than suited to generic apps.
Scalable open-source game backend server: multiplayer, matchmaking, leaderboards, chat, and social features for games.
These projects were analysed and named instant among their alternatives. The relationship is not symmetric — how instant rates them is a separate judgement, made when instant is analysed in its own right.
calls instant “actively maintained realtime BaaS with auth, permissions, storage, presence, and streams; choose when you want a modern drop-in-style backend without RethinkDB ops.”
Horizon is a realtime, open-source backend for JavaScript apps.
calls instant “choose it when presence, streams, and a sync-oriented model matter more than an embedded SQLite REST backend”
Open Source realtime backend in 1 file
calls instant “Choose when your app relies on realtime presence, streams, and live database sync; Parse's realtime features are less central.”
Parse Server for Node.js / Express
calls instant “Choose when you want a hosted realtime backend with auth and permissions instead of running your own P2P sync layer.”
An open source cybersecurity protocol for syncing decentralized graph data.
calls instant “Use for AI-coded apps that need realtime client-synced data/presence rather than a server-side Postgres backend via MCP.”
The all-in-one, open-source backend platform for agentic coding. InsForge gives your coding agent database, auth, storage, compute, hosting, and AI gateway to ship full-stack apps end-to-end.
calls instant “Use it when you want a realtime, offline-syncing backend with auth/permissions built for client-centric/AI apps, not SQL/GraphQL.”
The Open Source Firebase Alternative with GraphQL.
calls instant “Choose it when you want a realtime-first backend with presence, streams, and client-side permissions rather than serverless functions.”
Laf is a vibrant cloud development platform that provides essential tools like cloud functions, databases, and storage solutions. It enables developers to quickly unleash their creativity and bring innovative ideas to life with ease.
calls instant “Choose for a hosted realtime backend with built-in auth and presence instead of self-hosting ShareDB.”
Realtime database backend based on Operational Transformation (OT)