#1
Firebase

Firebase

★★★★ 4.4 Free / $0+ Free plan

Google's app development platform with NoSQL database, authentication, hosting, and cloud functions.

firestoreauthenticationcloud-functionshosting
✓ Generous free tier (Spark plan)✓ Real-time database syncing✓ Simple authentication setup
#2
Replit

Replit

★★★★ 4.3 Free / $25+ Free plan

Browser-based IDE with AI agent that can build, deploy, and host full applications from natural language.

browser-ideai-agentinstant-deployhosting
✓ No setup required — runs in browser✓ AI agent builds full apps from prompts✓ Instant deployment and hosting included
#3
Bolt.new

Bolt.new

★★★★ 4.3 Free / $20+ Free plan

AI full-stack app builder by StackBlitz that generates, runs, and deploys complete web applications in the browser.

full-stack-generationbrowser-runtimemulti-frameworkdeployment
✓ Builds entire apps from a single prompt✓ Runs code in browser (WebContainers)✓ Supports multiple frameworks (React, Vue, Svelte)
#4

Val Town

★★★★ 4.2 Free / $10+ Free plan

Social website for writing, deploying, and sharing small programs (vals) that run on the cloud, like a social network for serverless functions.

serverless-functionscron-jobshttp-endpointsemail-handling
✓ Instant deployment of code snippets✓ Social coding with remixable vals✓ Built-in cron, email, and HTTP triggers

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