Short version: 1Blocker is the best Safari ad blocker on iOS — fast, invisible, zero battery impact. If you only care about ads in Safari, it's hard to beat. But ads also appear in games, news apps, social media feeds, and every other app on your phone — and 1Blocker can't touch those. Casper blocks ads everywhere (DNS-level filtering), adds tracker blocking across all apps, AI threat detection, and VPN encryption. Safari-only or everywhere — that's the real choice.
Yes Partial / limited No
| Feature | Casper's Cloak | 1Blocker |
|---|---|---|
| Safari ad blocking | ||
| 1Blocker is best-in-class here — it uses Apple's Content Blocker API to remove ads directly from Safari pages, including cosmetic filtering that hides empty ad containers. Casper blocks ad domains at the DNS level, which stops most ads from loading but can leave blank spaces where ads would have been. | ||
| Blocks ads in non-Safari apps (games, news, social) | ||
| This is the fundamental difference. 1Blocker only operates inside Safari. Ads in games, news apps, social media feeds, weather apps, and every other app on your phone are completely untouched. Casper's DNS-level filtering blocks ad domains regardless of which app makes the request. | ||
| Blocks ads in Chrome / Firefox on iOS | ||
| Apple's Content Blocker API only works in Safari. If you use Chrome, Firefox, Brave, or any non-Safari browser on iOS, 1Blocker does nothing. Casper's network-level approach blocks ads in every browser. | ||
| Tracker blocking | ||
| 1Blocker blocks trackers within Safari — and does it well. But analytics SDKs, telemetry endpoints, and tracking pixels inside other apps are invisible to it. Casper blocks tracker domains at the network level across all apps. | ||
| Cosmetic filtering (removes empty ad spaces) | ||
| 1Blocker can surgically remove DOM elements from Safari pages so you never see blank ad containers. DNS-level blocking can't do this — Casper blocks the ad from loading but the page layout may still reserve space for it. | ||
| AI threat detection | ||
| Casper runs an ML classifier on DNS queries, scoring domains against ~40 features (registration age, cert chain, hostname similarity to known brands). 1Blocker is a content blocker, not a security product — it doesn't analyze domains for phishing or malware. | ||
| VPN encryption | ||
| Casper wraps all traffic in a WireGuard tunnel — critical on public WiFi. 1Blocker is purely a Safari content blocker with no encryption layer. | ||
| Works on Android | ||
| 1Blocker is iOS and Mac only — built entirely on Apple's ecosystem. Casper has native apps for Android, iOS, and Mac. | ||
| Battery impact | ||
| 1Blocker has near-zero battery impact because Apple's Content Blocker engine does the actual filtering — 1Blocker just provides the rules. Casper runs a VPN tunnel, which uses some battery (typically 3-5% additional daily drain). | ||
| Setup complexity | ||
| Both are simple. 1Blocker: install, enable in Safari settings, done. Casper: install, approve VPN profile, done. | ||
| Custom filter rules | ||
| 1Blocker supports advanced Safari content blocking rules — custom CSS selectors, URL patterns, regex matching. Casper offers domain-level allowlist/blocklist controls but not page-level element rules. | ||
| Price | ||
| 1Blocker: one-time purchase ~$5 or subscription ~$15/year for premium features. Casper: subscription ~$5/month or ~$50/year — more expensive, but includes VPN infrastructure, ML threat detection, and cross-platform apps. Different value propositions at different price points. | ||
| Apple ecosystem integration | ||
| 1Blocker is built from the ground up on Apple technologies — Content Blocker API, Safari Web Extensions, iCloud sync, Shortcuts integration, Focus Filters. It feels native because it is native. Casper works on Apple devices but isn't built on Apple-specific APIs. | ||
Different tools for different threat models.
This is actually the power-user move. 1Blocker handles Safari content blocking (cosmetic filtering, element hiding, advanced page rules) while Casper handles everything else (system-wide DNS filtering, VPN encryption, AI threat detection). They use different iOS slots — 1Blocker uses Safari Content Blocker, Casper uses the VPN profile — so they don't conflict. You get clean Safari pages AND system-wide protection. See our iPhone ad blocking guide for setup instructions.
Common questions when choosing between a content blocker and a DNS filter.
DNS-level ad blocking across every app. AI threat detection. VPN encryption. Free trial — apps for iPhone, Mac, and Android.