Zerroday vs Devmaxx
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zerroday
This app helps users build confidence and discipline by analyzing their responses to market conditions. It provides tools for learning, reflection, and analysis based on psychological patterns, focusing on hypothetical decision-making in a safe, educational environment.
- AI-guided decision reflection
- Hypothetical choice recording
- Emotional pattern feedback
- Live market reference data
- Practice mode for safe learning
- Learning journal and progress tracking
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Zerroday — AI-Powered Market Learning and Behavioral Insight Platform Zerroday helps users build confidence, discipline, and awareness by analyzing how they respond to changing market conditions. Rather than focusing on execution or trading activity, the app guides users through learning, reflection, and analysis tools based on psychological and decision-making patterns. The app supports individuals interested in developing structured thinking, better emotional control, and an understanding of how markets move — especially in index derivative environments such as Nifty, Bank Nifty, and Sensex. All features are designed for educational and reflective use only. What Zerroday Helps With Many people studying market behavior struggle not with technical understanding but with human behavior under uncertainty. Stress, excitement, hesitation, overconfidence, and impulsive reactions can affect decision quality — sometimes more than the market itself. Zerroday provides a structured environment where users can explore these reactions safely. Core Features AI-Guided Decision Reflection Record hypothetical choices during market conditions Receive feedback highlighting emotional patterns such as hesitation, rushing, or second-guessing View personal improvement over time Market Reference Data View live reference pricing and market movement for learning purposes Explore Nifty, Sensex, and Bank Nifty-based instruments to understand structure, volatility, and pricing models Study option chain behavior and market swings in real time Practice Mode (Not Real Trading) Users can log hypothetical decisions during market movement No real money, brokerage integration, or execution capability Designed for safe learning and emotional awareness Learning Journal & Progress Tracking Automatically organizes practice sessions for reflection Identify trends such as overthinking, chasing entries, or acting too quickly Track growth in consistency, discipline, and confidence Who Is It For? Zerroday is designed for: Individuals learning how markets behave Students exploring derivatives and index price movement People interested in trading psychology and emotional discipline Those who want a structured, practice-based learning method before engaging with real markets Educational Purpose & Compliance Zerroday does not provide trading execution, brokerage services, signals, financial advice, or profit expectations. All interactions are hypothetical, learning-focused, and based on self-reflection and behavioral awareness. The app’s purpose is to support personal development, discipline, and mindful market learning — especially for individuals preparing to study real-world financial environments in a responsible way.
Devmaxx
This app provides a daily system design question to help software engineers master essential skills for interviews and career growth. It offers clear explanations, linked resources, and a private community for learning and practice.
- Daily system design questions
- Clear explanations and answer breakdowns
- Linked learning resources
- Access to previous questions
- Private developer community
- Progress tracking
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System design is becoming one of the most important skills for software engineers. Many companies now require a dedicated system design interview, and your career growth often depends on your ability to design large-scale systems. Devmaxx gives you one focused system design question every day across databases, infrastructure, APIs, theory, and product to help you learn these skills and stay sharp. Each question takes about two minutes, and includes a resource to learn more about the subject. What you’ll get: • A new system design question daily • Clear explanations for every answer • Breakdown of the correct answer • Access to previous questions • Linked resources to go deeper • Access to a private community of developers learning and building the same things as you • Progress tracking to monitor growth If you’re preparing for interviews, this builds daily momentum. If you’re already working as an engineer, this keeps your fundamentals sharp. Open the app. Answer one question. Land the offer. * All features described above require a subscription Terms of Service: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: Zerroday at 89% against Devmaxx's 17%. Zerroday also leads on monetization model (free vs subscription) and iOS requirement (15.0 vs 17.5). On price, update cadence, ads and in-app purchases 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. Zerroday sells 5 one-off in-app purchases and Devmaxx sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.
Zerroday ships an update every 10 days, Devmaxx every 2 weeks. The most recent releases landed on October 1, 2026 and October 13, 2026 respectively.
| Parameter | Zerroday | Devmaxx |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (520 ratings) — better |
| Positive reviews | 88.9% of reviews — better | 17.0% of reviews |
| Number of ratings | — | 520 — better |
| Update frequency | Every 10 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free — better | Subscription |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.5 |
| Further details — not scored | ||
| Size | 61 MB | 29 MB |
| Age rating | 4+ | 12+ |
| Developer | Zerroday | Arjay McCandless LLC |
Customer experience
Zerroday
Devmaxx
In-app purchases
Zerroday
- Weekly Pass2 variants$0.99
- Daily Pass2 variants$0.99
- Monthly Plan2 variants$2.99
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- Safety Nets Discount$7.99
- Safety Nets$9.99
Devmaxx
- Monthly Devmaxx Subscription7 Days trial$8.991 Month
- Annual Devmaxx Subscription7 Days trial$59.991 Year









