How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- ChatGPT is the best all-rounder, Claude is the best writer, Perplexity is the best researcher, and Grok is the most tightly tied to real-time social conversation.
- Every assistant here has a usable free tier, so start free and pay only when you hit limits or need the newest models.
- Poe is the best value if you want several models in one subscription instead of paying for each separately.
- AI assistants can be confidently wrong, so verify important facts, code, and quotes before you act on them, especially for work that others will rely on.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 ChatGPT | All-round everyday assistant | See website | Yes |
 Claude | Long writing and analysis | $17 per month (billed annually) | Yes |
 Gemini | Google ecosystem users | See website | Yes |
 Microsoft Copilot | Windows and Microsoft 365 users | See website | Yes |
 Perplexity | Research with sources | See website | Yes |
 Poe | Many models in one app | See website | Yes |
 DeepSeek | Free high-quality chat | See website | Yes |
 Grok | Real-time answers and personality | See website | Yes |
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
The best AI assistant apps
#1ChatGPT
Best for: All-round everyday assistant4.6/5 on
G2 (3,089 reviews, checked Oct 2026)
Visit chatgpt.com
Starting priceSee website
Free planYes
ChatGPT remains the default AI assistant for most people, with the broadest capabilities across writing, coding, image generation, and voice conversation. Its free tier handles everyday questions, drafting, and brainstorming, while paid plans add the newest models, higher limits, and priority access.
The main weakness is accuracy: ChatGPT writes fluently even when it is wrong, so check facts, code, and citations before relying on them. Paid pricing is not published on the homepage, so verify it at signup. For a single assistant that does almost everything well, ChatGPT is still the safest first pick.
What we like- The largest user base and ecosystem
- Strong across writing, coding, and images
- Voice mode and apps on every platform
- Free tier covers daily use
Watch out for- Free tier limits access to the newest models
- Paid pricing is not on the homepage
- Answers can be confidently wrong
#2Claude
Best for: Long writing and analysis4.6/5 on
G2 (488 reviews, checked Oct 2026)
Visit claude.ai
Starting price$17 per month (billed annually)
Free planYes
Claude, from Anthropic, is the writer's assistant: it handles long documents, nuanced tone, and careful analysis better than most rivals, and its free plan already includes web search, file creation, code running, and memory across conversations. Pro costs $17 per month with an annual subscription, or $20 when billed monthly, and adds more usage, Claude Code, projects, and access to more models.
Usage limits apply on every plan, and Claude's ecosystem is smaller than ChatGPT's. For writing, editing, and thinking through complex material, Claude is the strongest choice here, and its transparent pricing makes the upgrade decision easy.
What we like- Best long-form writing and careful reasoning
- Free plan includes web search, files, and code
- Pro adds Claude Code and projects
- Clear pricing on the site
Watch out for- Pro costs $20 per month when billed monthly
- Usage limits apply even on paid plans
- Fewer third-party integrations than ChatGPT
Starting priceSee website
Free planYes
Gemini is Google's assistant, and its advantage is placement: it lives inside Gmail, Docs, Drive, Search, and Android, so it can summarize your email, draft in your documents, and answer from your files without switching apps. Its free tier covers everyday chat and research, and its multimodal skills handle text, images, and video.
The downside is dependence on Google's ecosystem: the best experience requires a Google account and Google apps, and paid pricing is not published on the homepage. If your digital life already runs on Google, Gemini is the most convenient assistant you can pick.
What we like- Built into Gmail, Docs, Drive, and Android
- Strong multimodal understanding
- Free tier covers everyday use
- Tight Google Search integration
Watch out for- Paid pricing is not on the homepage
- Best features require a Google account and ecosystem
- Answers vary in depth by topic
Starting priceSee website
Free planYes
Microsoft Copilot brings AI assistance across work and life in a single experience on the web, desktop, and mobile, with existing chats, history, and files carrying over automatically. A free tier is available with a Microsoft account, work and personal conversations stay separate, and Microsoft 365 subscriptions add the Copilot app plus desktop Office apps and premium features.
The experience is not identical everywhere: features and limits differ between Windows, web, and mobile, and paid pricing is not on the homepage. For Windows users and Microsoft 365 subscribers, Copilot is the natural assistant, since it works where your documents already live.
What we like- Built into Windows, Edge, and Microsoft 365
- Free tier with a Microsoft account
- Work and personal chats kept separate
- Word, Excel, and PowerPoint free on the web
Watch out for- Paid pricing is not on the homepage
- The experience varies across Windows, web, and mobile
- Some features need a Microsoft 365 subscription
#5Perplexity
Best for: Research with sources4.4/5 on
G2 (361 reviews, checked Oct 2026)
Visit perplexity.ai
Starting priceSee website
Free planYes
Perplexity works like a research assistant rather than a chatbot: ask a question and get an answer built from retrieved web sources, with citations you can open and verify. That design makes it the best assistant here for current events, product research, and fact-checking, where ChatGPT and Claude sometimes answer from memory instead.
Creative writing and long-form drafting are weaker, and paid pricing is not published on the homepage. Use Perplexity when the answer must be sourced and current, and pair it with Claude or ChatGPT when you need to turn research into polished writing.
What we like- Answers with cited sources you can check
- Strong for current events and research
- Clean, search-like interface
- Free tier covers daily research
Watch out for- Weaker at creative writing than ChatGPT or Claude
- Paid pricing is not on the homepage
- Source quality depends on what it retrieves
Starting priceSee website
Free planYes
Poe, from Quora, lets you chat with many AI models in one app, including GPT, Claude, Gemini, Grok, and thousands of community bots, privately or in group chats. That multi-model access is its whole appeal: instead of subscribing to several assistants, you compare answers side by side and pick the best model for each task.
The trade-off is dependence: Poe's access to other companies' models can change, and the newest models may arrive on Poe later than on their native apps. Paid pricing is not published on the homepage. Poe suits curious users and professionals who want to compare models without managing several subscriptions.
What we like- Chat with many leading models in one place
- Private or group chats
- Bots for specific tasks
- Free tier for trying models
Watch out for- Paid pricing is not on the homepage
- You depend on Poe's access to other companies' models
- Newest models may arrive later than on native apps
Starting priceSee website
Free planYes
DeepSeek is a Chinese AI lab whose chat assistant offers strong reasoning and coding at no cost, with a free chat app and an API platform for developers. Its models have earned attention for matching much more expensive rivals on technical tasks, and the basic service requires no subscription.
The ecosystem is smaller than ChatGPT's or Gemini's, and paid pricing is not published on the homepage. For users who want a capable free assistant, especially for coding and technical questions, DeepSeek is the best no-cost option here.
What we like- Strong reasoning and coding for a free service
- Chat and API platform available
- Lightweight app
- No subscription required for basic use
Watch out for- Pricing for paid tiers is not on the homepage
- Smaller ecosystem than US rivals
- Availability and features vary by region
Starting priceSee website
Free planYes
Grok, built by xAI, is an AI assistant for text and voice chat, image and video generation, real-time web search, coding, and reasoning through complex problems. Its distinctive strength is awareness of real-time conversation, especially on X, which makes it useful for fast-moving news, trends, and social topics where other assistants lag.
That personality is a double edge: Grok's humor and informality suit casual use but not every workplace, and fast-moving answers still need verification. Paid pricing is not published on the homepage. Grok suits users who want a lively, real-time assistant and already live on X.
What we like- Real-time web search and social conversation awareness
- Image and video generation
- Text and voice chat
- Free tier available
Watch out for- Paid pricing is not on the homepage
- Personality and humor are not for every workplace
- Accuracy on fast-moving topics needs checking
How we chose
We verified all eight homepages by opening them and confirming each loads and belongs to the assistant listed. ChatGPT, Gemini, and Perplexity homepages returned only thin content to the checking tool, so those three are counted as domain and title confirmed rather than full-content verified. Prices were taken from vendor pages where published, with Claude Pro confirmed at $17 per month billed annually, and we used "See website" elsewhere rather than repeat unverified figures.
How to pick an AI assistant
Start with your ecosystem: Google users get the most from Gemini, Microsoft users from Copilot, and X users from Grok. Then match the job: choose Claude for writing, Perplexity for research, ChatGPT for general use, and Poe if you want several models at once.
Next, test the free tier for a week before paying, since all eight offer one. Pay attention to limits: free tiers cap usage and model access, and paid plans differ more in limits than in raw ability. Privacy matters too. Each provider handles your conversations differently, with different retention settings and training policies, so read the privacy controls before pasting work documents, personal details, or unpublished ideas into any assistant. Business users should check whether their employer allows a given tool at all, since some companies restrict assistants over data concerns. Finally, build a verification habit: check important facts against sources, test code before shipping it, and never paste sensitive personal or company data into an assistant you do not trust.
Frequently asked questions
Which AI assistant is best overall?
ChatGPT is the best all-rounder for most people, Claude is best for writing, Perplexity is best for research, and Gemini is best inside Google apps. The right pick depends on your main job.
Are free AI assistants good enough?
For everyday questions, drafting, and brainstorming, yes. Paid plans mainly add newer models, higher limits, and priority access, which matter for heavy professional use and for anyone who hits free limits daily.
Can I trust AI assistant answers?
Not blindly. Assistants can produce plausible but wrong facts, code, and citations. Verify important claims against primary sources, especially for health, legal, financial, and academic work.
Is Poe worth it instead of separate subscriptions?
Yes, if you regularly compare models or use several assistants lightly. Heavy users of one model usually get better limits from that model's native subscription, and they also get new features first.
Which assistant is best for coding?
Claude and DeepSeek are both strong for coding, with ChatGPT close behind. Claude's dedicated coding tools give it an edge for professional development work, while DeepSeek offers strong reasoning at no cost for students and hobbyists.
Sources we checked (8)
- https://chatgpt.com
- https://claude.ai
- https://gemini.google.com
- https://copilot.microsoft.com
- https://www.perplexity.ai
- https://poe.com
- https://www.deepseek.com
- https://grok.com
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.