Notion Alternatives: 12 Best Similar Tools (2026)

Google's AI assistant family — Gemini 3 Pro for top reasoning, 3.5 Flash for speed. Tight integration with Search, Workspace (Gmail/Docs), and Android.

Perplexity is a free AI-powered answer engine that provides accurate, trusted, and real-time answers to any question.

AI Research Assistant developed by Google. Uplo...

OpenAI's flagship AI chatbot with the largest mainstream user base. GPT-5.x models for chat, search, image generation, voice, code interpreter, and agent workflows.

*reviews* - Chat with any PDF.

Anthropic's AI assistant family — Claude Opus, Sonnet, and Haiku. Strong for writing, coding, analysis, vision, and long-context reasoning.

Local knowledge management tools to build a second brain

Reflect is an AI-enhanced note-taking app designed to turn scattered thoughts into a connected knowledge system.

AI-native workspace for autonomous agents with shared memory and persistent tools.

Adobe's AI add-on built into Acrobat that summarizes PDFs, answers questions about document content, and points to the source pages.

DeepSeek's AI assistant. API

Runable is a general AI agent that can execute any task, from building web apps, slides, reports, and documents to generating images, videos, and...