Comparison

0Day vs ByteSniffer

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

Head to head
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

About

ByteSniffer

This tool allows developers to capture, inspect, and modify network traffic on their mobile devices. It enables debugging, API testing, and troubleshooting by providing features like request rewriting, session history, and scripting.

Highlights
  • HTTP capture and session history
  • Request and response inspection
  • Request and response rewrite tools
  • JavaScript scripting support
  • HTTPS MITM debugging
  • API debugging and testing
Features
Read full description

ByteSniffer is a professional network debugging tool designed for iOS developers, QA engineers, and networking professionals. It supports real-time capture and analysis of HTTP/HTTPS, SSE, WebSocket, TCP, and UDP traffic. You can inspect request headers, response content, real-time messages, bidirectional raw data, and data in multiple formats including Hex, Text, and JSON. ByteSniffer also provides useful tools such as Host filtering, capture history, full-text search, sharing and export, request replay, content rewriting, breakpoints, and JavaScript scripting. These features help you quickly troubleshoot API errors, connection issues, and data transmission problems. HTTPS and WSS traffic analysis requires installing and trusting the MITM certificate provided by the app. Some advanced features require Pro access. Please use ByteSniffer only with applications and network environments that you own or are authorized to test. Membership Purchase: Unlock permanent access for only CNY 19.9, including MITM, HTTPS, SSE, WebSocket, TCP, UDP, Replay, Rewrite, Breakpoints, and Scripts — for about the price of a cup of milk tea. Privacy Policy: https://www.kdocs.cn/l/cbOGcxNm6ic9 User Agreement: https://www.kdocs.cn/l/cnVXUBVNwGOd

Screenshots

0Day4 screens
ByteSniffer4 screens

Verdict

The call

The clearest difference is review sentiment: 0Day at 100% against ByteSniffer's 50%. ByteSniffer's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.0). 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. 0Day sells 2 in-app purchases, starting at $3.99 per month and ByteSniffer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

0Day ships an update every 5 days, ByteSniffer every 8 days. The most recent releases landed on November 5, 2026 and November 9, 2026 respectively.

Scorecard3 real differences · 8 level
0Day versus ByteSniffer: the parameters behind the verdict, then further details
Parameter0DayByteSniffer
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings2 — better—
Update frequencyEvery 5 days — betterEvery 8 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
Best chart rank#195#169 — better
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS18.015.6 — better
Further details — not scored
Size10 MB22 MB
Age rating4+4+
DeveloperRichard Lous存龙 霍

Customer experience

0Day

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

ByteSniffer

Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

In-app purchases

2 purchases

0Day

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

ByteSniffer

One-time1
  • Permanent Pember$2.99

Questions

Is 0Day free?
0Day is free to download, with in-app purchases available.
Is ByteSniffer free?
ByteSniffer is free to download, with in-app purchases available.
Do 0Day or ByteSniffer have ads?
Neither 0Day nor ByteSniffer shows ads.
Which is updated more often, 0Day or ByteSniffer?
0Day ships an update every 5 days, and ByteSniffer every 8 days. Most recently, 0Day was updated on November 5, 2026 and ByteSniffer on November 9, 2026.
Which is more popular, 0Day or ByteSniffer?
0Day currently peaks at #195 in the App Store charts, and ByteSniffer at #169. Chart position reflects recent download velocity rather than total install base.

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