Overview
pumaDB and Persona.js serve different but complementary roles in the AI agent ecosystem. pumaDB is a hosted memory store that gives agents durable, persistent storage for facts, preferences, and context without database setup. Persona.js is an open-source chat UI library that embeds agentic interfaces into websites, with WebMCP-native tool execution. This comparison helps you decide which fits your project needs.
Feature Comparison
| Feature | pumaDB | Persona.js |
|---|---|---|
| Primary Function | Durable memory storage for AI agents | Agentic chat UI library for websites |
| Setup Complexity | Minimal – hosted MCP or REST API | Minimal – npm or script tag install |
| Integration | MCP (Streamable HTTP) or REST API | npm/CDN, SSE streaming backend |
| Data Storage | JSON rows (20 tables, 1000 rows each, 25 MB) | No storage – UI only |
| Agent Memory | Yes – preferences, context, task state | No – relies on backend |
| UI/UX | API-only | Floating, docked, fullscreen widget |
| Tool Execution | Not applicable | WebMCP-native with user approval |
| Safety | Version history, rate limits, scoped tables | Shadow DOM isolation, user approval |
| Open Source | No | Yes |
| Backend | None (fully hosted) | Any SSE backend or Runtype proxy |
Pricing
pumaDB offers a free tier with 20 tables, 1,000 rows per table, and 25 MB total storage. Rate limits are 30 writes/min and 60 reads/min per key. Pricing beyond the free tier is not publicly detailed but likely usage-based or subscription.
Persona.js is open-source and free. The Runtype CLI and proxy service may have separate pricing (not specified on the site).
Pros and Cons
pumaDB Pros
- Zero infrastructure setup – no database, vector store, or RAG stack needed
- Durable memory persists across sessions, tools, and chats
- Version history with easy restore (last 10 versions, 30 days)
- Natural language edits for memory updates
- Supports both MCP (for agents) and REST (for server-side apps)
pumaDB Cons
- Proprietary hosted service – no self-hosting option
- Limited storage (25 MB total) may not suit large-scale applications
- No built-in UI – memory management requires separate frontend
Persona.js Pros
- Framework-agnostic – works with any stack (React, Vue, vanilla JS, etc.)
- WebMCP-native – agents can use page tools directly with user approval
- Multiple layout modes: floating, docked, fullscreen
- Shadow DOM isolation prevents style conflicts
- Open-source and extensible with custom SSE parsers
Persona.js Cons
- No built-in memory storage – requires external solution for persistence
- Requires backend SSE endpoint for streaming chat
- Theming and customization may require CSS token knowledge
Verdict
Choose pumaDB if you need a simple, durable memory store for AI agents without managing infrastructure. Choose Persona.js if you want to add an agentic chat UI to your website with WebMCP tool execution. They can be complementary: use Persona.js for the frontend and pumaDB for backend memory.
Persona.js
pumaDB