Signal87 AI Alternatives: 12 Best Similar Tools (2026)

NotebookLM

Free

AI Research Assistant developed by Google. Uplo...

Claude

Free + Pro $20/mo+ · Manually verified

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

DeepSeek's AI assistant. API

ChatPDF

*reviews* - Chat with any PDF.

ChatGPT

Freemium · Manually verified

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.

Perplexity AI

Freemium

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

Moxt

Freemium

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

Gemini

Freemium · Manually verified

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.

Scholarcy

Freemium

Scholarcy is an AI-powered research assistant designed to help students, researchers, and professionals read, understand, and organize academic...

xAI's AI assistant

Poe

Freemium

Poe is an innovative AI tool that enables users to access multiple chat platforms powered by various artificial intelligence models.

Raccoon AI

Free

The AI Coworker for Apps, Research, Docs & Everything Else. Raccoon AI is a collaborative AI agent and workspace for getting real work done.