COSS vs Dev Mastery
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
COSS
Showcase your professional skills and earn digital badges to impress recruiters. Measure and certify your abilities in soft, technical, and mad skills to build a dynamic portfolio for job applications.
- Skill measurement and certification
- Network-based feedback collection
- Digital badges for soft and technical skills
- CV and LinkedIn profile integration
- Dynamic skills portfolio creation
- 35+ soft skills, 200+ technical skills, 20 mad skills
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Unlock Your Dream Opportunities with COSS! Ready to land that perfect internship, apprenticeship, or dream job? Look no further than COSS – the ultimate tool to showcase your talents and impress recruiters. With COSS, you can measure and certify your skills, just like the TOEIC test, but developed to assess your professional skills. Here's how it works: 1. Choose the skills you want to showcase. 2. Seek quick and simple feedback from your network – fellow students, professors, and professionals you work(ed) with during internships, apprenticeships or student jobs. 3. Discover your strengths and areas for growth with detailed results and expert recommendations. But that's not all! COSS takes your achievements to the next level. Earn digital COSS badges for your soft skills and display badges with your school's logo for your technical skills. Publish these badges on your CV and LinkedIn profile to make a lasting impression on potential employers. With COSS, you can build a dynamic skills portfolio for each job application. You have a full array of options: • 35 soft skills, including Adaptability, Effective Communication, and more. • 200 technical skills, from UX design to Financial Analysis and beyond. • 20 mad skills, covering everything from team leadership to music talents and volunteer experience. Don't miss out on the opportunity to boost your career. Download COSS now and stand out in the competitive job market. Your dream opportunity is just a click away!
Dev Mastery
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Dev Mastery t'accompagne pour maîtriser SwiftUI et les bases de Swift. Parcours structurés (Débutant → Expert), leçons avec exemples de code, quiz pour valider chaque leçon, et défis pour mettre en pratique. Gagne des XP, suis ta progression et ton streak, consulte l’aide-mémoire Swift/SwiftUI à tout moment. • Cours : Les bases du développement d'applications • Défis : applique ce que tu apprends et gagne des XP • Aide-mémoire : référence rapide (types, struct, class, modificateurs, navigation) • Suivi : niveau, XP, streak, bilan de la semaine Idéal pour débuter en développement d'applications Une partie du contenu est gratuite ; l’abonnement Premium débloque tout et retire les publicités. Conditions d’utilisation (CLUF) : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: COSS at none against Dev Mastery's 1. COSS also leads on ads (none vs shown) and device support (3 vs 1). Dev Mastery's advantage is update cadence (every 4 days vs every 6 weeks). On price 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. Dev Mastery sells 1 in-app purchase, starting at $8.99 per month. COSS asks for nothing beyond the download.
COSS ships an update every 6 weeks, Dev Mastery every 4 days. The most recent releases landed on September 29, 2026 and September 26, 2026 respectively.
| Parameter | COSS | Dev Mastery |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 83.3% of reviews | — |
| Update frequency | Every 6 weeks | Every 4 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 40 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | 5FEEDBACK | Sofyan Zarouri |
In-app purchases
COSS
No in-app purchases
Dev Mastery
- Premium Mensuel$8.991 Month









