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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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memU
✓ verifiedFreemium
Open-source memory framework for AI agents that stores learned context as searchable markdown files, priced by token usage.
29K visits/mo
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Code Arena
✓ verifiedFree
Side-by-side arena to compare AI coding models and build multi-file apps, with a public leaderboard and battle mode.
35M visits/mo201 saves
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Google Antigravity
✓ verifiedFree
Google's agentic development platform and IDE for building software with autonomous, Gemini-powered coding agents.
22M visits/mo18K saves
Pricing
No public pricing
No public pricing
No public pricing
Core features
- ✦File-based memory stored as markdown
- ✦Hybrid search across memory files
- ✦Full provenance to source conversations
- ✦Memory API and Response API
- ✦Open-source components (server, UI)
- ✦Multi-user/agent, multimodal memory
- ✦Head-to-head model comparison
- ✦Battle mode matchups
- ✦Public model leaderboard
- ✦Multi-file app generation
- ✦File uploads as input
- ✦Agent-first IDE experience
- ✦Autonomous planning and code execution
- ✦Integrated editor, terminal and browser control
- ✦Powered by Google's Gemini models
- ✦High-level developer supervision
Use cases
- →Giving AI agents persistent memory
- →Building 24/7 proactive agents
- →AI companions and coding assistants
- →Knowledge management for agents
- →Choosing the best coding model
- →Benchmarking AI code quality
- →Prototyping small apps
- →Building apps with AI agents
- →Automating multi-step coding tasks
- →Prototyping and iterating on software
- →Assisting developers on complex work
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