Character.AI

Character-driven conversational AI for entertainment and roleplay

Freemium subscription Free plan: Yes

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ChatGPT

Versatile AI assistant for writing, research, coding and everyday tasks

Freemium Free plan: Yes

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ChatPDF

Simple AI document chat and analysis for PDFs and other files

Freemium subscription Free plan: Yes

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Claude

AI assistant for writing, analysis, coding and complex tasks

Freemium Free plan: Yes

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Connected Papers

Visual citation graph discovery for academic literature

Freemium subscription Free plan: Yes

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Consensus

Evidence-focused academic search with AI synthesis across research papers

Freemium subscription Free plan: Yes

AI ResearchAI Writing

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DeepSeek

Reasoning and coding models with a free chat app and low-cost API

Free web app + usage-based API Free plan: Yes

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Elicit

AI research assistant for evidence synthesis and systematic-review workflows

Freemium per-user subscription Free plan: Yes

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Fireflies.ai

AI meeting assistant for transcription, summaries, search and CRM workflows

Freemium per-seat subscription Free plan: Yes

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Gemini

Google AI assistant for writing, research and productivity

Freemium; premium via Google AI plans Free plan: Yes

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Gemini Notebook

Source-grounded AI research and learning workspace from Google

Free research product + premium Google AI plans Free plan: Yes

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Grok

xAI assistant with real-time web and X search plus multimodal tools

Freemium subscription + usage-based API Free plan: Yes

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HuggingChat

Open-source multi-model AI chat with automatic model routing

Free credits + Hugging Face PRO credits / self-hosting Free plan: Yes

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Humata

AI document assistant for asking questions across PDFs and files

Freemium page-based subscription Free plan: Yes

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Jenni AI

Academic writing and research assistant with citations and PDF workflows

Freemium subscription Free plan: Yes

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Le Chat

Legacy name for Mistral Vibe, now a unified work and coding AI agent

Renamed to Mistral Vibe Free plan: Yes

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Litmaps

Literature discovery maps with alerts for ongoing academic research

Freemium subscription Free plan: Yes

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Manus

General AI agent that executes multi-step tasks instead of only answering

Freemium credit-based subscription Free plan: Yes

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Meta AI

Free multimodal assistant across Meta apps, web and AI glasses

Free consumer service Free plan: Yes

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Microsoft Copilot

AI assistant for Microsoft workflows and everyday productivity

Free assistant + Microsoft 365 subscriptions Free plan: Yes

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Mistral Vibe

Mistral’s unified AI agent for work, research and agentic coding

Freemium subscription Free plan: Yes

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Notion

Connected workspace with AI for notes, knowledge and team productivity

Freemium Free plan: Yes

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Notion AI

AI assistance integrated into the Notion workspace

Included in Notion Business/Enterprise; limited trial on lower plans Free plan: Limited

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PDF.ai

PDF chat, parsing and structured document extraction platform

Subscription / usage-based Free plan: Check current availability

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Perplexity

AI search and research assistant with cited answers

Freemium subscription Free plan: Yes

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Phind

Developer-focused AI search and coding assistant for technical problem solving

Freemium subscription Free plan: Yes

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Poe

Multi-model AI chat platform with access to many leading models

Freemium points-based subscription Free plan: Yes

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Qwen

Alibaba’s agentic, coding and multimodal AI model family

Free chat + usage-based API/open models Free plan: Yes

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ResearchRabbit

Visual literature discovery and citation mapping for researchers

Freemium subscription Free plan: Yes

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Scholarcy

AI research-paper summarizer with flashcards and literature matrix tools

Freemium subscription Free plan: Yes

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SciSpace

AI research workspace for literature review, paper analysis and academic writing

Freemium credit-based subscription Free plan: Yes

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Scite

Research discovery and citation analysis using Smart Citations

Subscription / institutional access Free plan: Limited/trial

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Semantic Scholar

Free AI-powered scholarly search and literature discovery engine

Free Free plan: Yes

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You.com

Real-time web search and research infrastructure for AI agents

Subscription / usage-based Free plan: Check current availability

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