Codelet vs Cosmo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Codelet
Prepare for technical interviews by identifying core coding patterns and analyzing your performance. Practice coding questions conveniently to improve your skills and pinpoint areas for growth.
- Identify core patterns
- Analyze approaches
- Track performance
- Identify improvement areas
- Practice coding questions
- Anytime, anywhere practice
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∙ Identify and analyze the core patterns and approaches ∙ View how well you’re doing and where you can improve ∙ Practice coding questions anywhere and anytime
Cosmo
This app offers hands-on, practice-based lessons to build in-demand skills in areas like GenAI, business, and tech. It acts as a personal AI tutor, adapting to your learning pace and providing instant help on any topic. Earn shareable certificates and skill badges to advance your career.
- Personalized AI tutor
- Hands-on, practice-based lessons
- Learn GenAI, business, tech, and more
- Earn skill badges and certificates
- Instant help on any topic
- 200+ career-building skills
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Build real skills in just minutes a day. No videos. Just doing. Cosmo is your personal AI tutor, always ready with hands-on lessons that adapt to you. Whether you're between classes, commuting, or on a break, you’ll make real progress in GenAI, business, tech, and more. Built by CodeSignal, the AI platform trusted by over 3,000 top employers for hiring, including Google, Meta, Zoom, Netflix, TikTok, and Anthropic. Loved by over 1 million learners who build and prove their skills with CodeSignal. Why Cosmo • Cosmo, your AI tutor, adapts to you and guides you on your journey so you can learn faster • Fun, practice-based lessons that keep you engaged • Master the most in-demand skills to grow your career • Earn shareable certificates and skill badges • Take full courses or get instant help on any topic Every course is free. Learn GenAI, business, marketing, sales, finance, accounting, product management, project management, leadership, communication, emotional intelligence, Python, JavaScript, Go, Swift, Kotlin, Rust, web development, cloud, SQL, data science, analytics, machine learning, data engineering, personal finance, focus, decision making, critical thinking, public speaking, habit formation, and more. Explore 200+ career-building skills • GenAI: Practice prompts and apply ChatGPT at work • Finance: Understand money, markets, and valuation • Marketing: Learn digital ads, branding, SEO, and strategy • Coding: Learn Python, JavaScript, and more through practice • Data: Build skills in SQL, machine learning, and analytics • Leadership: Grow communication and strategic thinking • Personal Growth: Build habits, confidence, and clarity • Startups: Learn how to launch your idea into the world If you like Cosmo, try Cosmo+ to learn faster with unlimited energy. Learn on the web at: https://codesignal.com/learn Send feedback to: support@codesignal.com Privacy Policy: https://codesignal.com/privacy Terms of Use: https://codesignal.com/terms/
Screenshots
Verdict
The clearest difference is in-app purchases: Codelet at none against Cosmo's 4. Codelet also leads on iOS requirement (13.4 vs 16.4). Cosmo's advantage is review sentiment (84% vs 53%) and update cadence (fortnightly vs every 2 months). On price, rating, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Cosmo sells 4 in-app purchases, starting at $12.99 per month. Codelet asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.7 for Codelet against 4.8 for Cosmo. That said, the two scores are not equally well evidenced: Cosmo has 810 ratings behind it against 127, so its average is the more settled of the two. Written reviews are what separate them: 53% of Codelet's written reviews are positive against 84% of Cosmo's.
Codelet ships an update every 2 months, Cosmo fortnightly. The most recent releases landed on August 13, 2026 and September 24, 2026 respectively.
| Parameter | Codelet | Cosmo |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (127 ratings) | 4.8 (810 ratings) — better |
| Positive reviews | 53.3% of reviews | 84.1% of reviews — better |
| Number of ratings | 127 | 810 — better |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 13.4 — better | 16.4 |
| Further details — not scored | ||
| Size | 25 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Codelet LLC | CodeSignal |
Customer experience
Codelet
Cosmo
Bugs and requests
Codelet
Not enough reviews yet to summarise bugs or requests.
Cosmo
Requested features
1 request- Ability to upgrade/customize Cosmo's outfit and spaceship
In-app purchases
Codelet
No in-app purchases
Cosmo
- Unlimited Access7 Days trial$12.991 Month
- Unlimited Access7 Days trial$24.991 Month
- Unlimited Access7 Days trial$78.001 Year
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- Unlimited Access7 Days trial$149.991 Year
