Guard vs Nullgen AI Blocker
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Guard
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Acting both as a traditional antivirus app & an online security assistant, Guard empowers you to take control of your online security with ease. Featuring automatic device scans, web protection blocking malicious endpoints and on-demand tools for cyber hygiene and Wi-Fi security, Guard helps you stay protected from viruses, vulnerabilities, privacy risks, and other security threats. Stay one step ahead with advanced protection designed for everyone, no technical expertise required. All features are included in a 7 day free trial - followed by a yearly subscription to keep access. Threat Scan: Guard's Threat Scan is an automatic scanner which looks for issues such as: iOS Version - Scans for known vulnerabilities in your iOS version. Device Lock - Confirms your device has a solid authentication method. Web Shield: Web Shield is your extra layer of protection while browsing on Safari. It works as a secure local content filter in the background, blocking access to known malicious websites, servers, and IP addresses before they can reach your device. All this without insight on your online activity. Link Scanner: An on-demand tool to investigate suspicious links. The link is checked against databases of known malicious endpoints and scanned for common threats. Your Cyber Hygiene Hub: Cyber hygiene made simple. Each week, you’ll receive easy-to-follow security tips and tasks designed to improve your online habits and reduce common risks. Track your progress, build consistency, and take control of your personal security without feeling overwhelmed. Small actions, real protection. ATTRIBUTIONS: The advanced security scanning capabilities of Guard are made possible through the significant contributions of leading security researchers, governmental organizations, and academic institutions. APIs utilized include those provided by MalwareBazaar, URLhaus and NVD. No official cooperation has been established between Guard - Digital Security and the mentioned APIs.
Nullgen AI Blocker
This app prevents AI chatbots and websites from functioning on your iPhone or iPad. It blocks access to over 70 AI services, including popular ones like ChatGPT and Gemini, across Safari, Chrome, and other apps. A VPN configuration is used locally on the device to filter AI destinations without routing your traffic.
- Blocks over 70 AI services
- Works on Safari, Chrome, and apps
- Local VPN configuration for filtering
- No off switch for continuous blocking
- Parental controls for access requests
- Cross-device protection with Nullgen Pro
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Nullgen AI Blocker is a parental-control and content-blocking app for families, schools, and workplaces. It stops AI chatbots and AI websites from working on this iPhone or iPad — in Safari, Chrome, and the apps themselves. Set it up once and it stays on. PART OF THE NULLGEN AI BLOCKER SUITE • Browser extension for Chrome, Edge, Firefox, and Safari — detects AI prompt boxes on any website and stops typing and pasting into them, on the device. • iPhone and iPad app (this app) — blocks known AI apps and websites across most websites and apps on the device. • Mac app — the same protection for Safari on the Mac. One Nullgen Pro account covers every device, with the same rules and the same approvals everywhere. WHAT IT BLOCKS ChatGPT, Gemini, Claude, Copilot, Grok, Perplexity, DeepSeek, Character.AI, Poe, Midjourney, and more than 70 other AI services. The list is kept up to date by Nullgen so new tools are covered without an app update. HOW IT WORKS To work, the app asks iOS for permission to add a VPN configuration. That configuration is used only to filter AI destinations on this device. It is not a traditional VPN: your traffic is never routed through Nullgen or anyone else, and nothing you browse is sent to our servers. When an app or browser tries to reach a known AI destination, the request is answered on the device and simply does not load. Everything else works normally. NO OFF SWITCH There is no button in the app to pause or disable blocking. That is the point: the person holding the phone is often not the person who installed it. FREE FOR 3 DAYS Start the trial with no account and no card. It lives on this device. When it ends, protection continues with Nullgen Pro. NULLGEN PRO — FAMILY Subscribe in the app, then link this iPhone or iPad to your Nullgen account at nullgen.ai/link. From there a parent can: • Approve or deny access requests. A child taps “Request AI access”, picks the tool and how long they need it, and the parent approves from the Nullgen dashboard. The tool unblocks instantly for exactly that time — fifteen minutes, an hour, a day, or permanently. • Set allow and deny rules per AI tool for each child. • Cover every device in the household: browser extensions for Chrome, Edge, Firefox, and Safari, plus the iPhone, iPad, and Mac apps, under one subscription. NULLGEN PRO — EDUCATORS AND ENTERPRISE Schools and companies deploy Nullgen across managed devices and route AI access requests to named approvers. Learn more and sign up at nullgen.ai. PRIVACY • Blocking decisions are made on the device. • Nullgen never receives which sites you visit or what you type. • The free trial creates no account. • Access requests contain only the tool, the duration, and an optional note you write. • Nullgen does not sell, share, or disclose any data from this app to third parties, and does not use it for advertising. Privacy Policy: https://nullgen.ai/privacy WHAT IT DOES NOT DO AI features built into services that share ordinary hosts — such as AI answers inside a search engine or a social app — are not blocked separately, because blocking them would block the whole service. On a personal, unsupervised iPhone, iOS still allows the VPN configuration to be removed in Settings; that is an operating-system limit. SUBSCRIPTION TERMS Nullgen Pro Family is offered as a monthly or yearly auto-renewing subscription, billed through your Apple account. Payment is charged at confirmation of purchase. The subscription renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel in Settings › Apple Account › Subscriptions. Terms of Service: https://nullgen.ai/terms Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is iOS requirement: Guard at 16 against Nullgen AI Blocker's 18.0. 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. Guard sells 1 in-app purchase, starting at $19.99 per year and Nullgen AI Blocker sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | Guard | Nullgen AI Blocker |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 6 days | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 16 — better | 18.0 |
| Further details — not scored | ||
| Size | 22 MB | 17 MB |
| Age rating | 4+ | 17+ |
| Developer | Arctic Sentinel AB | Nullgen, Inc. |
In-app purchases
Guard
- 1 Year Subscription7 Days trial$19.991 Year
Nullgen AI Blocker
- Nullgen Family Monthly14 Days trial$5.991 Month
- Nullgen Family Yearly14 Days trial$59.991 Year









