Best Shopify bot-blocker apps: an evaluation framework
Every listicle ranking bot blockers was written to rank, not to help you choose. This page gives you the six questions that actually separate the apps in this category, so you can evaluate any of them (including ours) in one trial week.
The category includes established names like Blockify, Blocky, and Securify alongside newer detection-focused entrants like Cordon. They differ far more in architecture than in feature-list wording.
1. Does it detect, or just match lists?
Any app can block a country or a pasted IP. The hard problem is traffic that hides: residential proxies that look like home connections, headless browsers that claim to be Chrome, fake Googlebots. Ask every vendor: where does your VPN and proxy data come from, and how old is it? A list compiled in 2018 misses essentially every modern residential proxy.
2. Where does the block happen?
Most blockers inject JavaScript that hides the page after it loads. That means scrapers that never run JS (python-requests, Scrapy: most of them) are not blocked at all, and real visitors pay the script's performance cost. Prefer apps that decide at the network or edge level before the page renders.
3. Can it block Google? Then it eventually will.
The most expensive bot-blocker failure is deindexing your own store. User-agent allowlists are not enough, because anyone can claim to be Googlebot. The safe design verifies crawlers against their published networks and makes verified search engines impossible to block, even by your own rules.
4. What does it cost your Lighthouse score?
Shopify storefronts are mobile-heavy and conversion tracks speed. A blocker that injects a render-blocking script tag can cost more revenue than the bots did. Look for theme app extension integration and measure your scores before and after the trial.
5. What happens when the vendor has an outage?
If the app fails closed, its downtime becomes your storefront downtime. If it fails open, a hiccup means a few bots slip through for a minute, and your customers never notice. Fail open is the only defensible default for commerce.
6. What does its own log store about your visitors?
A visitor log full of raw IP addresses is a GDPR liability you did not need. IPs are personal data in the EU. Hashed or truncated storage with a rotating salt gives you the same operational insight with none of the exposure. Ask for the vendor's DPA before installing, not after.
How Cordon answers the six questions
| Question | Cordon's answer |
|---|---|
| Detection or lists? | Live commercial VPN/proxy data, headless markers, request-velocity checks, spoofed-crawler detection |
| Where does blocking happen? | Edge decision in under 50ms; Cloudflare worker enforcement on Plus |
| Can it block Google? | No. Verified search engines and good bots are always allowed, verified by network |
| Lighthouse cost? | Theme app extension, no script tags, built to keep scores intact |
| Outage behavior? | Fails open. Your store keeps selling |
| What does the log store? | SHA-256 hashed IPs, daily-rotating salt, DPA available |
For head-to-head detail, see Cordon vs Blockify, Cordon vs Blocky, and Cordon vs Securify. For the deeper mechanics, read how scrapers steal Shopify catalogs and how to block bots without blocking Google.
Run the evaluation on Cordon first
Install free, watch the live log for a week, and grade us on all six questions. If another app scores better for your store, use it.
Free plan included, 7-day free trial on paid plans. Cancel anytime.
Frequently asked questions
What is the best bot blocker for Shopify?
The one whose detection matches your threat. For simple country blocking, several established apps work. For scrapers, proxy fraud, and disguised bots, you need live detection data, network-verified crawlers, and edge-level blocking. Cordon was built for that second case.
Are free bot blockers good enough?
Free tiers are fine for basic country blocking and for testing an app's UX. Real scraper and proxy detection costs the vendor money per lookup, so genuinely free apps are usually running static lists underneath.
Can Shopify block bots natively?
Shopify handles platform-level abuse (checkout bots on flash sales via its bot protection for Shopify Plus), but it does not offer merchant-configurable visitor blocking by country, VPN, or ASN. That is what the app category exists for.
How do I test a bot blocker before trusting it?
Install it on a trial, then: check your homepage renders with JavaScript disabled, run Lighthouse before and after, fetch your store with curl to see if unauthenticated automation is caught, and inspect the app's visitor log for what it stores about real customers.