AI Share LabAI SHARE / USAGE / TREND
By use case ・ Free

Best free AI tools — ranking

A recommended ranking of AI chat tools usable on a free plan, compared by free-tier value and popularity share.

A. The bottom line for Free
#1 is ChatGPT.Then Google Gemini, DeepSeek. Recommended in this order, prioritizing Japanese support・Web search.
1
ChatGPT
OpenAI ・ Popularity score 77.1 ・ share 77.6%
Free tier
$8/mo+

OpenAI's AI chat — the default choice, leading the global AI chatbot market share by a wide margin.

Japanese support: ○Web search: ○
2
Google Gemini
Google ・ Popularity score 37.2 ・ share 7.0%
Free tier
$7.99/mo+

Google's AI chat — strong at search and Google-service integration; share is rising fast, especially in Japan.

Japanese support: ○Web search: ○
3
DeepSeek
DeepSeek ・ Popularity score 30.1 ・ share 0.0%
Free tier

A high-performance, low-cost AI from China — free web chat and very cheap API.

Japanese support: ○Web search: ○
4
Grok
xAI ・ Popularity score 35
Free tier
$10/mo+

xAI's AI chat — known for X (formerly Twitter) integration, real-time info and image generation.

Japanese support: ○Web search: ○

Source: StatCounter (market share) + each official site (features, pricing) ／ Captured: 2026-06 ／ Reference ranking by our editors

Frequently asked questions

Which AI is the best for Free?
ChatGPT. The rating prioritizes support for Japanese support・Web search and popularity share.
What is this ranking based on?
An editorial reference ranking that combines support for the features that matter for Free (Japanese support・Web search) with market share and the popularity score.

Other rankings by use case

Best AI for Coding→Best AI for AI search→Best AI for Writing→Best AI for Image generation→Best AI for Translation→Best AI for Meeting notes→Best AI for Documents→

⚠ These rankings are reference values based on public market-share data, web-traffic estimates and editorial research, and do not represent a complete count of every user of each AI tool. Rankings change with the measurement method (web-visit share vs. market share, etc.). Always check each official site for the latest information.