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Side-by-side features, use cases and pricing — because the right pick depends on your job and budget, not just the ranking.
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Replit
✓ verifiedFreemium
AI app-building platform where autonomous coding agents build, test, and deploy full-stack web and mobile apps from a prompt.
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Opera One Browser
✓ verifiedFree
Free Chromium-based desktop browser with tab grouping, built-in AI, free VPN, ad blocker and sidebar apps.
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Project IDX by Google
✓ verifiedFree
Google's cloud-based, AI-assisted development environment, now rebranded and merged into Firebase Studio.
Pricing
No public pricing
Starter: $0/month (free daily Agent credits)
Core: $20/month billed annually, $25/month billed monthly (monthly credits included)
Pro: $95/month billed annually, $100/month billed monthly (monthly credits included)
No public pricing
No public pricing
No public pricing
Core features
- ✦Fast tensor operations
- ✦Differentiable tensors for gradient-based optimization
- ✦Network connectivity
- ✦Integration with Bun and Flashlight
- ✦Support for GPU computation with CUDA (Linux) and CPU computation (macOS)
- ✦Autonomous AI coding agent that builds and deploys apps end to end
- ✦Visual, code-connected design canvas for UI tweaks
- ✦Built-in database and one-click publishing/hosting
- ✦Parallel multi-agent task execution for large projects
- ✦Integrations with tools like Linear, Notion, and Excel
- ✦Convert web apps into mobile apps
- ✦Credit-based usage billing on paid tiers
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- ✦Tab Islands for organizing tabs into groups
- ✦Built-in Opera AI assistant with page context
- ✦Free VPN and ad blocker
- ✦Modular sidebar with apps and messengers
- ✦Split-screen browsing and immersive themes
- ✦Cloud-based IDE accessible from the browser
- ✦AI-assisted coding
- ✦Cross-platform app development
- ✦Preconfigured workspaces and templates
- ✦Now part of Firebase Studio
Use cases
- →Creating and manipulating datasets
- →Training small machine learning models
- →Implementing advanced training and inference logic
- →Building applications that require tensor computations
- →Non-developers building working apps by describing them in prompts
- →Teams prototyping business or mobile apps quickly
- →Developers offloading repetitive coding/coordination to an AI agent
- →Enterprises needing SSO and dedicated environments for AI app building
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- →Browsing with organized tab groups
- →Using AI assistance while browsing
- →Protecting privacy with a free VPN
- →Multitasking with sidebar apps and split screen
- →Building apps from anywhere in the browser
- →Prototyping with AI assistance
- →Developing cross-platform applications
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