Comparison

Zerroday vs Devmaxx

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • AI-guided decision reflection
  • Hypothetical choice recording
  • Emotional pattern feedback
  • Live market reference data
  • Practice mode for safe learning
  • Learning journal and progress tracking
Features
Read full description

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.

About

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.

Highlights
  • Daily system design questions
  • Clear explanations and answer breakdowns
  • Linked learning resources
  • Access to previous questions
  • Private developer community
  • Progress tracking
Features
Read full description

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

Zerroday4 screens
Devmaxx4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
Zerroday versus Devmaxx: the parameters behind the verdict, then further details
ParameterZerrodayDevmaxx
PriceFreeFree
Rating—4.3 (520 ratings) — better
Positive reviews88.9% of reviews — better17.0% of reviews
Number of ratings—520 — better
Update frequencyEvery 10 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.5
Further details — not scored
Size61 MB29 MB
Age rating4+12+
DeveloperZerrodayArjay McCandless LLC

Customer experience

Zerroday

Written reviews9 reviews
Positive88.9%
Neutral0.0%
Negative11.1%

Devmaxx

All ratings520 ratings
Positive84.0%
Neutral1.0%
Negative15.0%
Written reviews53 reviews
Positive17.0%
Neutral7.5%
Negative75.5%

In-app purchases

5 purchases

Zerroday

One-time5
  • Weekly Pass2 variants$0.99
  • Daily Pass2 variants$0.99
  • Monthly Plan2 variants$2.99
Show 2 more
  • Safety Nets Discount$7.99
  • Safety Nets$9.99
2 purchases

Devmaxx

Subscriptions2
  • Monthly Devmaxx Subscription7 Days trial$8.991 Month
  • Annual Devmaxx Subscription7 Days trial$59.991 Year

Questions

Is Zerroday free?
Zerroday is free to download, with in-app purchases available.
Is Devmaxx free?
Devmaxx is free to download, with in-app purchases available.
Do Zerroday or Devmaxx have ads?
Neither Zerroday nor Devmaxx shows ads.
Which is updated more often, Zerroday or Devmaxx?
Zerroday ships an update every 10 days, and Devmaxx every 2 weeks. Most recently, Zerroday was updated on October 1, 2026 and Devmaxx on October 13, 2026.

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