Comparison

Learn Ruby Fast vs 0Day

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

Head to head
About

Learn Ruby Fast

Master Ruby programming fundamentals with interactive lessons designed for beginners. This app guides you through essential coding skills, making it accessible to learn on your mobile device. Explore the basics of app and website development.

Highlights
  • Guided programming lessons
  • Core Ruby skills
  • Beginner-friendly
  • Mobile learning
  • App and website development basics
Features
Read full description

Learn Ruby from the comfort of your couch. RubyPad teaches you the core programming skills used by real software engineers, with guided lessons you can complete on your phone. Perfect for beginners or anyone curious about how developers build apps and websites. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

0Day

Receive immediate alerts for zero-day vulnerabilities, supply chain attacks, and compromised packages relevant to your specific technology stack. Get early warnings before they hit the news cycle, enabling proactive security measures.

Highlights
  • Zero-day vulnerability alerts
  • Supply chain attack notifications
  • Compromised package warnings
  • Stack-aware filtering
  • Early warning system
  • Push notifications
  • Full alert archive
Features
Read full description

Most security feeds bury you in CVEs that have nothing to do with what you ship. 0Day cuts through that. Zero-days, supply chain attacks, compromised packages, active exploits: filtered to your exact stack, the moment they break. Pick your stack once during onboarding: npm, PyPI, Docker, Kubernetes, React, Rails, OpenSSL, whatever you use and the feed shows you only what touches your tech. No noise. No irrelevant advisories. Just what matters to you. The goal is lead time. Know about a compromised package, a poisoned build pipeline, or an actively exploited CVE before it reaches your CI, your production deployment, or your customers. Before the news cycle. Before the stragglers patch. Before you're the one scrambling at 2am. WHY 0DAY - Privacy-first — no analytics, no tracking, no third-party SDKs - Early warnings before the news cycle — the moment a threat breaks, you know - Stack-aware filtering — see only threats that hit the tools you use - Multi-source corroboration — duplicates merged, sources ranked by tier - Curated, not firehose — every alert is tied to a specific component - Full archive — searchable history of every threat that hit your stack HOW IT WORKS Every item in the feed goes through a three-stage lifecycle so you can tell the difference between "we're watching this" and "this is real, act now": CANDIDATE — A single source has reported an incident. In the pipeline, being correlated, not yet corroborated. EARLY WARNING — Either an authoritative research outlet flagged it, or a second independent source has confirmed the same incident. Pushed to your device immediately — this is the lead time the product is built for. CONFIRMED — Two or more authoritative sources agree, or three independent sources total. High-confidence state you can act on without double-checking. INSIDE THE FEED Each alert gives you a plain-English summary, affected components with version ranges, recommended action, CVE and GHSA identifiers with tappable links to the upstream advisories, and a timeline of when each source reported the incident. PRIVACY We collect only what we need to run the service: your email for sign-in, your stack selections, your notification preferences, and your device token for push delivery. No analytics. No crash reporting SDKs. No advertising identifiers. No cross-app tracking. All data is stored in the European Union on AWS infrastructure. You can delete your account and all associated data instantly from Settings. SUBSCRIPTION 0Day Pro unlocks the full experience: early warning alerts, push notifications, full archive access, remediation guidance, and stack filtering. All new users get a free 14-day trial — no payment required to get started. After the trial, subscribe to keep full access. Offered as a monthly or annual subscription. Payment is charged to your Apple ID at confirmation of purchase. Subscription auto-renews unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in iOS Settings → Apple ID → Subscriptions. Terms of Use: https://0day.lous.nl/terms Privacy Policy: https://0day.lous.nl/privacy

Screenshots

Learn Ruby Fast4 screens
0Day4 screens

Verdict

The call

The clearest difference is update cadence: 0Day at every 5 days against Learn Ruby Fast's every 6 months. Learn Ruby Fast's advantage is device support (3 vs 1) and iOS requirement (15.1 vs 18.0). On price, rating, review sentiment and ratings volume 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. Learn Ruby Fast sells 2 in-app purchases, starting at $9.99 per month and 0Day sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Learn Ruby Fast against 5.0 for 0Day. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Learn Ruby Fast ships an update every 6 months, 0Day every 5 days. Both last shipped on October 24, 2026.

Scorecard3 real differences · 7 level
Learn Ruby Fast versus 0Day: the parameters behind the verdict, then further details
ParameterLearn Ruby Fast0Day
PriceFreeFree
Rating5.0 (3 ratings)5.0 (2 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings3 — better2
Update frequencyEvery 6 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better18.0
Further details — not scored
Size47 MB10 MB
Age rating9+4+
DeveloperDalvin Digital Design LLCRichard Lous

Customer experience

Learn Ruby Fast

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

0Day

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

Learn Ruby Fast

Subscriptions2
  • Pro Monthly3 Days trial$9.991 Month
  • Pro Annually3 Days trial$59.991 Year
2 purchases

0Day

Subscriptions2
  • 0Day Pro7 Days trial$3.991 Month
  • 0Day Pro1 Month trial$29.991 Year

Questions

Is Learn Ruby Fast free?
Learn Ruby Fast is free to download, with in-app purchases available.
Is 0Day free?
0Day is free to download, with in-app purchases available.
Which has better reviews, Learn Ruby Fast or 0Day?
Learn Ruby Fast and 0Day are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.
Do Learn Ruby Fast or 0Day have ads?
Neither Learn Ruby Fast nor 0Day shows ads.
Which is updated more often, Learn Ruby Fast or 0Day?
Learn Ruby Fast ships an update every 6 months, and 0Day every 5 days. Most recently, Learn Ruby Fast was updated on October 24, 2026 and 0Day on October 24, 2026.

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