This article takes an honest look at IPQualityScore (IPQS) and where it overlaps with cside.
Since you're on the cside website, we acknowledge our bias. That said, we've built our case honestly and based our analysis on publicly available information, industry information, and our own or our customers' experiences.
If you want to verify their claims yourself, please go to their product page.
Let's be clear up front: IPQualityScore and cside are not the same product. IPQS is a well-established fraud-detection vendor with a broad API suite, and it does plenty cside doesn't — IP/proxy reputation, email validation, phone validation, URL and malware scanning. This page compares the two on the layer where they actually overlap — browser device fingerprinting, bot, and AI-agent detection — and on the in-browser signals cside reads to do it: behavioral patterns like mouse movement, scroll behavior, and typing cadence captured from your own first-party JavaScript, plus an engine that flags AI-generated text in your forms. cside also goes beyond bot detection into client-side script security and PCI DSS coverage, which we cover at the end.
| Criteria | cside | IPQualityScore | Why It Matters | What the Consequences Are |
|---|---|---|---|---|
| Category | Client-side security + first-party device signals | Fraud-detection API suite (IP, email, phone, device, URL scores) | Different jobs that meet at the device-signal layer | |
| Breadth of fraud-scoring APIs | Focused on device/behavioural signals + script security | Full support broad: proxy/IP, email, phone, device, URL/malware scoring |
IPQS covers signal types cside does not | For email/phone/IP scoring, IPQS does a job cside doesn't |
| Device-signal collection | First-party JavaScript on your own domain | Tracker loads from an IPQS domain by default (`ipqscdn.com`); custom domain documented as an option | Signal integrity and ownership | Default third-party origin can be targeted by privacy extensions unless a custom domain is configured |
| AI agent detection | Full support detects + classifies agentic traffic in real time from first-party JS, reading in-session behavior (mouse, scroll, typing cadence) on the live page |
Bot/emulator/automation detection; AI-agent classification not publicly described | Emerging agentic-commerce traffic | |
| AI-generated text detection (form inputs) | Full support pass a form field's contents and cside flags whether a human or an AI wrote it |
No support not offered |
Fake reviews, spam sign-ups, and AI-written abuse pass network checks | Text-origin abuse stays invisible without a content-level signal |
| Public pricing & self-serve | Full support published pricing, free tier, trial |
Full support published pricing, free plan, self-serve tiers (Enterprise is contact-sales) |
Evaluate without a sales cycle | Both are commercially transparent |
What is IPQualityScore?
IPQualityScore (IPQS) is a fraud-detection and cybersecurity platform that has operated for over a decade. It is best known for a suite of risk-scoring APIs and a set of free lookup tools. The API suite covers proxy/VPN/Tor and IP reputation, email validation (including disposable-email detection), phone validation, device fingerprinting, and malicious-URL and malware scanning, plus specialised solutions for account takeover, chargeback fraud, and click fraud. According to its own materials, IPQS draws on a proprietary honeypot network, large-scale transaction data across thousands of businesses, botnet monitoring, and dark-web scanning to produce risk scores and reputation data.
IPQS publishes plan pricing and offers a free plan (1,000 lookups per month at the time of writing) plus self-serve paid tiers, with an Enterprise tier — which unlocks features such as device fingerprinting — available through sales. It states that data shared with its API endpoints is processed under ISO 27001 and SOC 2 Type II standards and that it is GDPR- and CCPA-compliant.
How IPQualityScore works
IPQS is primarily an API-and-score model. Your systems call IPQS endpoints — or embed its JavaScript device tracker and mobile SDKs — and IPQS returns risk scores and reputation data (for example, fraud scores, proxy/VPN flags, and device-fingerprint risk across what it describes as 300+ data points). Your application then decides what to do with those scores.
Two things follow from that design that matter for a client-side security buyer. First, the device fingerprint tracker is a JavaScript that, by default, loads from an IPQS-owned domain (www.ipqscdn.com or ipqualityscore.com) — a third-party origin that privacy extensions can target. IPQS does document a custom-domain option that lets you serve the tracking script from a domain you register, which reduces that exposure if you configure it. Second, that tracker is itself a third-party script running on your pages — precisely what PCI DSS 6.4.3 asks merchants to inventory and monitor — and IPQS's public materials don't describe a product for inventorying or tamper-monitoring the scripts on your payment pages.
How cside fits
cside isn't a replacement for the broad fraud-scoring suite IPQS offers — IP, email, phone, and URL scoring are jobs IPQS does and cside doesn't, and we won't pretend otherwise. What cside does is the layer underneath and around the device-signal and script story.
On the layer the two share — device, bot, and AI-agent detection — cside collects device and behavioral signals from your own first-party JavaScript, so there's no fixed third-party origin for a filter list to block and no fixed collector for a fraudster to detect and feed. It reads in-session behavior on the live page — mouse-movement patterns, scroll behavior, and typing cadence — alongside device fingerprinting (cside cites 96% accuracy across 102+ signals including IP, geolocation, VPN/proxy, and bot activity), with integrated bot and AI agent detection. It also adds a signal IPQS doesn't offer: an AI-generated-text detection engine — pass the contents of a form field (a review, a signup bio, a support message) and cside tells you whether a human or an AI wrote it. There's more on our bot detection and AI agent detection pages, and Avneh's posts on behavioral cursor detection and the two-stage neural detection stack explain the underlying motion and session signals in more detail.
Beyond bot detection, cside does the thing IPQS doesn't market: it inventories, justifies, and tamper-monitors every script on your payment pages — including device trackers like the IPQS one — to automate PCI DSS 4.0.1 requirements 6.4.3 and 11.6.1, with QSA-ready reports (VikingCloud-validated and accepted by leading QSAs). It gives you evidence you own, usable in chargeback disputes through our Chargebacks911 integration, deploys via a single first-party script tag — no proxy, no DNS changes — for 100% session visibility at zero added latency, and is SOC 2 Type II, ISO 27001, and GDPR-compliant with a 99.9% uptime SLA and 50+ integrations. Many teams run a fraud-scoring API like IPQS and cside together; if the first-party device-signal layer or PCI script coverage is your gap, that's where cside fits.
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Founder and CEO of cside. Previously a product manager on Cloudflare Page Shield (now Cloudflare Client-Side Security). Co-chair of the W3C Anti-Fraud Community Group and a Forbes 30 Under 30 honoree. Building accessible security against client-side attacks — web security is not an enterprise-only problem.
