Best AI tools to learn a language or subject

Short answer

Duolingo ranks #1 for learn a language or subject (score 9.2/10). Pricing: Unverified; free tier: yes. Runners-up: Khanmigo, ChatGPT.

Top 5, ranked by our published rubric. Sponsorship never affects the order. Last updated 2026-10-13.

Compare the top 5 side by side

#	Tool	Score	Pricing	Paid from	Free tier	What it is
1	Duolingo	9.2	Free tier	Unverified	yes	Language learning
2	Khanmigo	8.5	From $4	$4/mo or $44/yr	Unverified	AI tutor by Khan Academy
3	ChatGPT	8.5	Free tier	Go $8/mo (Plus $20/mo)	yes	General AI assistant by OpenAI
4	Gemini	7.8	Free tier	AI Plus $4.99/mo (AI Pro $19.99/mo)	yes	General AI assistant by Google
5	Gemini Notebook (formerly NotebookLM)	5.8	Unverified	Unverified	Unverified	Research notebook grounded in your sources

Rank 1

Duolingo

Free tierVisit Duolingo (opens in a new tab)

Language learning

Score 9.2/10Paid from: UnverifiedFree tier: yesLast verified 2026-10-13

Why ranked: Its own site says: “Learn languages by playing a game. It” We placed it 1st of 5 on fit for this task. Pricing unverified.

Fit 10.0 · value 8.1 · breadth 8 · availability 10 (how we score) · pricing source · site live

Rank 2

Khanmigo

From $4Visit Khanmigo (opens in a new tab)

AI tutor by Khan Academy

Score 8.5/10Paid from: $4/mo or $44/yrFree tier: UnverifiedLast verified 2026-10-13

Why ranked: Its own site says: “Khanmigo, built by nonprofit Khan Academy, is a top-rated AI for education.” We placed it 2nd of 5 on fit for this task. No free plan confirmed; paid from $4/mo or $44/yr.

Fit 8.5 · value 6.9 · breadth 10 · availability 10 (how we score) · pricing source · site live

Rank 3

ChatGPT

Free tierVisit ChatGPT (opens in a new tab)

General AI assistant by OpenAI

Score 8.5/10Paid from: Go $8/mo (Plus $20/mo)Free tier: yesLast verified 2026-10-13

Why ranked: Its own site says: “Use ChatGPT to answer questions, write, create images, complete work, and code—all in one place.” We placed it 3rd of 5 on fit for this task. Free tier; paid from Go $8/mo (Plus $20/mo).

Fit 7.0 · value 10.0 · breadth 10 · availability 10 (how we score) · pricing source · site live

SPONSORED Your tool here: paid placement is shown here, separate from the ranking, and never changes the order. Advertise

Rank 4

Gemini

Free tierVisit Gemini (opens in a new tab)

General AI assistant by Google

Score 7.8/10Paid from: AI Plus $4.99/mo (AI Pro $19.99/mo)Free tier: yesLast verified 2026-10-13

Why ranked: Gemini: General AI assistant by Google. We placed it 4th of 5 on fit for this task. Free tier; paid from AI Plus $4.99/mo (AI Pro $19.99/mo).

Fit 5.5 · value 10.0 · breadth 10 · availability 10 (how we score) · pricing source · site live

Rank 5

Gemini Notebook (formerly NotebookLM)

UnverifiedVisit Gemini Notebook (formerly NotebookLM) (opens in a new tab)

Research notebook grounded in your sources

Score 5.8/10Paid from: UnverifiedFree tier: UnverifiedLast verified 2026-10-13

Why ranked: Its own site says: “Use the power of AI for quick summarization and note taking, Gemini Notebook is your powerful virtual research assistant rooted in information you can trust.” We placed it 5th of 5 on fit for this task. Pricing unverified.

Fit 4.0 · value 5.0 · breadth 10 · availability 10 (how we score) · no readable pricing page · site live

FAQ

What is the best AI tool to learn a language or subject?

By TaskRanking's published rubric, Duolingo ranks first, followed by Khanmigo and ChatGPT.

Is there a free AI tool to learn a language or subject?

Yes: Duolingo has a free tier per its own pricing page (checked 2026-10-13).

How are these tools ranked?

Score = 50% fit, 25% value (from vendor pricing pages), 15% breadth, 10% availability. Sponsorship never affects rank.