ByteGuard vs Zarko
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ByteGuard
Securely manage passwords, generate strong ones, and store sensitive information with zero-knowledge encryption. Includes a built-in authenticator for 2FA codes and supports passkeys for passwordless sign-ins. Offers robust security features and cross-device syncing.
- Zero-knowledge encryption
- Password generation and management
- Built-in authenticator for 2FA
- Passkey support
- Secure storage for notes and cards
- Security reports and analysis
- Cross-device iCloud sync
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ByteGuard is a secure password manager and authenticator with zero-knowledge encryption. Your data stays completely private — we can't see it, only you can decrypt it. KEY FEATURES ◆ MILITARY-GRADE SECURITY • Zero-knowledge architecture: all encryption happens locally • AES-256-GCM encryption with Argon2id key derivation • Dual protection: Master Password + Secret Key • Biometric unlock (Face ID / Touch ID / Optic ID) • Auto-lock when you leave the app • Privacy screen protection in app switcher • Compatible with Apple Lockdown Mode ◆ SMART PASSWORD MANAGEMENT • Store unlimited passwords, cards, notes & identities — free • One-tap AutoFill in Safari and apps • Smart matching of associated domains for the same service • Auto-prompt to save new passwords from browsers (iOS 26.2+) • Powerful password generator with random characters or memorable passphrases • Password history tracking ◆ BUILT-IN AUTHENTICATOR • 2FA/TOTP & HOTP code generator • Works as your standalone authenticator app • Auto-copy codes + system-level one-tap AutoFill (iOS 18.0+) • SHA-1, SHA-256 & SHA-512 support ◆ PASSKEY SUPPORT • Create, store and use passkeys for passwordless sign-in • Works across browsers and apps • Syncs via iCloud to all your devices ◆ STORE MORE THAN PASSWORDS • Bank cards, identity documents & secure notes • API keys, software licenses & OAuth tokens • Organize with custom tags • Recover deleted items for 30 days ◆ MULTIPLE VAULTS • Separate vaults for personal, work & family • Each vault has independent encryption & Secret Key • Quick switch between vaults ◆ SECURITY REPORT • Password strength analysis, duplicate detection & expiration alerts • HTTP-only site detection • Data breach monitoring via Have I Been Pwned • 2FA coverage check • At-a-glance security summary on home screen • Overall security score (0–100) ◆ SYNC & BACKUP • Optional iCloud sync across all your Apple devices • End-to-end encrypted cloud backup • Import from 1Password, Bitwarden, LastPass, Dashlane, KeePass & Apple Keychain • Export to CSV, JSON or encrypted .bytegx ◆ PRIVACY FIRST • No account required to start • No tracking, no analytics, no ads • Your data never leaves your device unencrypted • Works fully offline ◆ WIDGETS & SPOTLIGHT • Quick-access widget with vault stats / color-coded digits & symbols • Password generator widget with one-tap copy • Spotlight search for instant access WHY BYTEGUARD? ByteGuard uses a zero-knowledge architecture. Your master password never leaves your device, and all encryption happens locally. Only you can access your data. FREE PLAN • Unlimited passwords, cards, notes & identities • Unlimited 2FA codes • Biometric unlock & AutoFill • Password generator & auto-lock PREMIUM (upgrade anytime) • iCloud sync & cloud backup • Unlimited vaults (free: up to 3) • Batch import & export • Data breach detection • Full security report • Custom themes Start with a 30-day free trial of all premium features. No credit card required. Monthly ($0.99), Yearly ($5.99), or Lifetime ($9.99) — pay once, use forever. --- Terms of Service: https://bytelink.online/en/terms Privacy Policy: https://bytelink.online/en/privacy Support: hellobyteguard@gmail.com
Zarko
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You can't trust yourself to put the phone down. So don't rely on willpower alone — rely on a real challenge. Zarko is a screen-time blocker with a twist: once you lock in a focus session, the way out is to prove it — not to quit. HOW IT WORKS • Choose the apps, categories, or websites you want blocked — powered by Apple's official Screen Time (FamilyControls) framework. • Start a focus session and get to work. Your chosen apps and sites stay locked for the full duration. • Tempted to check your phone early? Complete a quick physical or mental challenge — shake, walk, type, solve, remember — to break the block before time's up. No luck involved: finish the challenge and you're unlocked. • Want zero exits? Turn on Strict Mode in Settings and the give-up option stays locked until you're halfway through the session — the challenge becomes the only way out. BUILD A STREAK, NOT JUST A HABIT Every completed session adds to your daily streak. Miss a day and it resets — but your history stays. Track your weekly focus time, session count, and streak in one clean stats screen, and share your progress as a ready-to-post card. UNLOCK THEME COLORS Every successful challenge earns you a random color theme for the app — pure cosmetic, earned only by beating challenges, never sold. Collect all 12. WHY IT WORKS Traditional blockers fail because quitting is always one tap away. Zarko puts real effort between you and that tap, so staying focused becomes the easy choice — and if you want the door closed for real, Strict Mode removes the easy exit entirely. PRIVACY FIRST Zarko blocks apps and websites entirely on your device using Apple's Screen Time APIs. We never see which apps you use, what you type, or your browsing history — that data never leaves your phone. UNLOCK EVERYTHING (OPTIONAL ONE-TIME PURCHASE) Blocking, focus sessions, unlock challenges, streaks, and theme collecting are free — no ads, no subscriptions. If you want more, a single one-time purchase adds: • Your equipped theme color across the whole app and the block screen • Custom session lengths, from 5 minutes to 3 hours • Detailed stats: week-over-week trends and your top blocked apps by Screen Time Pay once, keep it forever. And no purchase ever lets you skip the challenge — the only way out early is still to earn it.
Screenshots
Verdict
The clearest difference is update cadence: ByteGuard at weekly against Zarko's fortnightly. On price, ads, in-app purchases and device support 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. ByteGuard sells 3 in-app purchases, starting at $0.99 per month and Zarko sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
ByteGuard ships an update weekly, Zarko fortnightly. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | ByteGuard | Zarko |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 24 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | 可文 麦 | Jaehoon Lee |
In-app purchases
ByteGuard
- Monthly Subscription$0.991 Month
- Yearly Subscription$5.991 Year
- Lifetime Premium$9.99
Zarko
- Unlock Everything$4.99









