
Memrise
Busuu
Babbel
Anki
Lingvist
Rosetta Stone
Mondly
Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.

Claude Code
Cursor
aider
Ghostty
opencode
Codebuff
GitHub Copilot
Frontier reasoning in the terminal

Which is more popular?
Duolingo might be a bit more popular than OpenAI Codex CLI. We know about 70 links to it since March 2021 and only 55 links to OpenAI Codex CLI.
Website, pricing, platforms and company facts side by side.
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| Website | duolingo.com | github.com |
| Company | Startup from the United States · 500 - 999 employees · 2011 | — |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Duolingo Review: Does it really work?
More videos
OpenAI Codex CLI
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Duolingo and OpenAI Codex CLI. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


For AI conversation practice, Duolingo Max is the tier to choose, and we'd call it a useful upgrade only if those extra features matter to you. It sits above the paid Super Duolingo tier rather than directly above the...
Our team of dedicated writers and language enthusiasts is committed to bringing you insightful content and expert advice to enhance your Duolingo experience. From language-learning tips to in-depth analyses of...
Language learning apps such as Duolingo, Babbel and others have millions of registered users worldwide. Duolingo alone has over 300 million registered users.
We have no reviews of OpenAI Codex CLI yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Duolingo: a language-learning app that uses points, levels, and rewards to keep you motivated. This is the most effective when you do it with your friends or a group of people who share your learning goals. I got really addicted to... Source: over 3 years ago
Hi! I wish I'd seen a post like this a few months ago. I would have been interested then. By now it's a little late for me. I just signed up for the 2 week free trial since that's about all the time I have left before I leave. If you... Source: over 3 years ago
If you want a guided course try Memrise or Duolingo. Source: over 3 years ago
Requirements: macOS, Windows, or Ubuntu 24.04 x64, Node 24+, pnpm, and at least one agent CLI (claude, codex, or grok) installed and logged in. Installed CLIs show up in the model picker automatically. - Source: dev.to / 5 days ago
That's the job of an Agent Skill (a folder of instructions your coding agent loads when it needs them) for Claude Code, Cursor and Codex, installed with npx skills add enmerasoftware/ai-design-check. - Source: dev.to / 8 days ago
This guide covers what codex exec does by default, how to give it more or less permission, how to get output a script can parse, how to continue a run with codex exec resume, and how to run it safely in CI. Commands and flags follow the... - Source: dev.to / 9 days ago
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Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .
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The AI-first Code Editor. Build software faster in an editor designed for pair-programming with AI.
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Babbel is a paid language learning service that aims to strike a balance between thoroughness and cost efficiency.
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