OpenAI's flagship conversational AI for writing, coding, and reasoning
Free tier
Drafting emails and documents
Writing and debugging code
Free tier; Plus $20/mo; Pro $200/mo; Team from $25/user/mo; Enterprise customVisit 
ClaudeAI Assistants & Chatbots
Anthropic's assistant known for long-context reasoning and coding
Free tier
Long-document analysis
Coding and refactoring
Free tier; Pro $20/mo; Max from $100/mo; Team from $25/user/mo; Enterprise customVisit Microsoft's AI assistant across Windows, Edge, and Microsoft 365
Free tier
Drafting in Word and Outlook
Excel data analysis
Free tier; Copilot Pro $20/mo; Microsoft 365 Copilot from $30/user/moVisit 
PoeAI Assistants & Chatbots
One subscription to chat across many AI models and bots
Free tier
Comparing AI models
Building custom bots
Free tier; Premium $19.99/mo (annual) with model usage points; higher tiers availableVisit 
PiAI Assistants & Chatbots
Inflection's empathetic personal AI for supportive conversation
Free tier
Talking through decisions
Emotional support chat
Open, cost-efficient chatbot with strong reasoning and coding
Free tier
Coding assistance
Math and reasoning tasks
Free web chat; API pay-as-you-go at very low per-token ratesVisit European AI assistant from Mistral with fast, open-weight models
Free tier
Coding help
Document analysis
Free tier; Pro ~$14.99/mo; Team and Enterprise plans availableVisit 
GrokAI Assistants & Chatbots
xAI's witty assistant with real-time access to X data
Free tier
Real-time trend analysis
Image generation
Free tier; SuperGrok ~$30/mo; also bundled with X Premium+ subscriptionsVisit Create and chat with AI characters for roleplay and companionship
Free tier
Roleplay and storytelling
Companion chat
Free tier; c.ai+ ~$9.99/moVisit Meta's free assistant built into WhatsApp, Instagram, and Messenger
Free tier
Chatting in WhatsApp and Messenger
Image generation
Google's multimodal AI assistant
Free tier
Drafting emails in Gmail
Summarizing Google Docs
Free tier available; Gemini Advanced via Google One AI Premium at ~$19.99/mo (varies by region).Visit Open-source AI chat powered by community models
Free tier
Testing open-source LLMs
No-signup quick chat
Free to use; no paid tier.Visit Alibaba's multilingual AI assistant
Free tier
Chinese-language writing
Bilingual translation
Free tier available; paid plan pricing not publicly confirmed.Visit 
KimiAI Assistants & Chatbots
Moonshot AI's long-context assistant
Free tier
Long PDF analysis
Contract review
Free tier available; premium plans exist, exact pricing varies.Visit AI search assistant that cites sources
Free tier
Cited web research
Privacy-conscious search
Free plan available; YouPro reportedly ~$9.99/mo for advanced models (pricing may change).Visit Google's AI research assistant grounded in your sources
Free tier
Literature review
Study guide generation
Free with a Google account; NotebookLM Plus via Google One AI Premium (~$19.99/mo, may vary).Visit Run privacy-first AI chatbots on your local machine
Free tier
Offline document Q&A
Private coding help
Free and open-source; no subscription required.Visit 
JanAI Assistants & Chatbots
Open-source desktop app to run AI models offline
Free tier
Private offline chat
Local API server
Free and open-source.Visit Khan Academy's AI tutor using Socratic dialogue
Math problem tutoring
Test prep
~$4/mo for students, or included in Khan Academy teacher/district plans (pricing subject to change).Visit Blazing-fast LLM inference powered by LPU hardware
Free tier
Rapid prototyping with LLM responses
Benchmarking inference speed
Free tier available; API access is pay-per-token (verify current rates on site)Visit Private AI chat with no conversation logging
Free tier
Private brainstorming without data logging
Exploring creative writing
Free tier with usage limits; Pro subscription available (verify current pricing on site)Visit Chat with top open-source models on one platform
Free tier
Comparing outputs across multiple LLMs
Evaluating open-source model quality
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Free tier
Switching between GPT-4, Claude, and Gemini in one app
Uploading and chatting with documents
Free trial available; paid plans from ~$10/mo (verify current pricing on site)Visit 
Ora.aiAI Assistants & Chatbots
Create and share custom AI chatbots in seconds
Free tier
Building a niche-topic chatbot without coding
Sharing custom AI assistants publicly
Free tier available; premium plans for higher usage and advanced models (verify on site)Visit 
MstyAI Assistants & Chatbots
Local-first AI chat app for Mac, Windows, and Linux
Free tier
Running local Llama or Mistral models privately
Branching conversations to explore different response paths
Free version available; Pro plan for additional features (verify on site)Visit Self-hosted AI workspace for documents and local models
Free tier
Chatting with private company documents on-premises
Building a local knowledge base with RAG
Free and open-source for self-hosting; managed cloud option available (verify on site)Visit Discover, download, and run local LLMs on your computer
Free tier
Running Llama, Mistral, or Phi models locally
Privacy-sensitive chat without internet
Free to download and use; no subscription required (local compute costs only)Visit Enterprise AI assistant grounded in your business data
Connecting AI to internal company wikis and documents
Secure customer support automation with proprietary data
Enterprise pricing; Cohere API has a free trial (verify on site)Visit Privacy-first AI assistant from the makers of Proton Mail
Free tier
Private AI chat with no training data usage
AI assistance integrated with Proton Mail or Drive
Free tier available; paid access tied to Proton plans (verify on site)Visit Create and share custom AI assistants on open models
Free tier
Building custom-persona chatbots on open models
Discovering community-created specialized assistants
Free to use; no paid tier required for standard chat and assistant creationVisit