Comparison

RegEx+ vs 0Day

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

Head to head
About

RegEx+

This tool helps developers master regular expressions on macOS and iOS. It offers a comprehensive cheatsheet and cloud synchronization across devices to decode and construct complex text patterns.

Highlights
  • Master regular expressions
  • Comprehensive cheatsheet
  • Cloud synchronization
  • Cross-device support (macOS, iOS)
  • Decode complex patterns
Features
Read full description

Visualize, test, and master regular expressions with RegEx+. RegEx+ is a focused regex toolkit for developers on iPhone, iPad, and Mac. Build and test patterns live, then instantly see how they work with interactive flow diagrams — a visual breakdown of every part of your regex. KEY FEATURES • Flow Diagrams — See your regex as a diagram. Instantly understand how each token, group, and quantifier connects. • Live Matching — Results update as you type. Match, capture, and replace in real time. • Cheat Sheet — A comprehensive reference for metacharacters, anchors, groups, and operators. Always one tap away. • Pattern Library — Save and organize your patterns, or start faster with 33 built-in templates. Sync across all your devices via CloudKit. • Multi-language Support — Available in English, French, German, Spanish, Italian, Japanese, Korean, Dutch, Polish, Chinese, Danish, Finnish, and Norwegian. Whether you're debugging a complex pattern or learning regex from scratch, RegEx+ gives you the tools to understand what your expression actually does. Download RegEx+ and start writing better regex today.

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

RegEx+4 screens
0Day4 screens

Verdict

The call

The clearest difference is review sentiment: 0Day at 100% against RegEx+'s 50%. 0Day also leads on price (Free vs $1.99) and rating (5.0 vs 4.2). RegEx+'s advantage is in-app purchases (none vs 2) and chart position (#102 vs unranked). On ratings volume and ads 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

0Day is free to download; RegEx+ costs $1.99 up front. 0Day sells 2 in-app purchases, starting at $3.99 per month. RegEx+ asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

0Day holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 50% of RegEx+'s written reviews are positive against 100% of 0Day's.

UpkeepUpdate frequency

RegEx+ ships an update every 4 weeks, 0Day every 5 days. The most recent releases landed on October 29, 2026 and October 31, 2026 respectively.

Scorecard9 real differences · 2 level
RegEx+ versus 0Day: the parameters behind the verdict, then further details
ParameterRegEx+0Day
Price$1.99Free — better
Rating4.2 (5 ratings)5.0 (2 ratings) — better
Positive reviews50.0% of reviews100.0% of reviews — better
Number of ratings5 — better2
Update frequencyEvery 4 weeksEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
Best chart rank#102 — better—
DevicesiPhone, iPad, Mac — betteriPhone
Requires iOS26.018.0 — better
Further details — not scored
Size5 MB10 MB
Age rating4+4+
Developer圣罡 汤Richard Lous

Customer experience

RegEx+

All ratings5 ratings
Positive60.0%
Neutral40.0%
Negative0.0%
Written reviews12 reviews
Positive50.0%
Neutral33.3%
Negative16.7%

0Day

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

In-app purchases

None

RegEx+

No in-app purchases

2 purchases

0Day

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

Questions

Is RegEx+ free?
RegEx+ costs $1.99, with no in-app purchases.
Is 0Day free?
0Day is free to download, with in-app purchases available.
Which has better reviews, RegEx+ or 0Day?
0Day is rated higher. RegEx+ averages 4.2 out of 5 from 5 ratings, while 0Day averages 5.0 from 2 ratings.
Do RegEx+ or 0Day have ads?
Neither RegEx+ nor 0Day shows ads.
Which is updated more often, RegEx+ or 0Day?
RegEx+ ships an update every 4 weeks, and 0Day every 5 days. Most recently, RegEx+ was updated on October 29, 2026 and 0Day on October 31, 2026.

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