CHEQ Alternative: cside vs CHEQ (2026)

CHEQ is a go-to-market security platform built to protect ad spend, forms, and paid-campaign traffic from invalid traffic and bots; cside is a client-side security and first-party signal product covering bot, AI-agent detection, and PCI DSS script monitoring. They overlap on the client-side, bot, and agent layers, here's where, the behavioral and AI-generated-text signals cside adds, and where they genuinely diverge.

Jun 27, 2026 • Updated Jul 19, 2026

Simon Wijckmans Founder & CEO

TL;DR: cside vs CHEQ

CHEQ is built for marketing teams: click fraud, invalid traffic, ad spend protection.
cside is built for security and compliance teams: browser supply chain, PCI DSS 6.4.3 and 11.6.1, and first-party device and behavioral signals with AI agent detection. Different buyer, different problem.
Protecting paid ad spend from invalid traffic: CHEQ. Protecting what executes on your payment page: cside.

How cside differentiates its device intelligence

The core difference is machine learning. On top of the 250+ browser, device, and network signals cside collects in each session, it runs separate models for cursor movement, for input and typing patterns, and for broader behavioural signals, then combines their verdicts. Many established tools score a session with one broad, general model. cside reads each behavioural channel with a model built for it.

cside is also specialised rather than generalistic. Instead of one broad platform stretched across every fraud category, it is tuned for specific use cases: account takeover, account sharing, chargeback evidence, and AI agent detection. That focus is what keeps the behavioural models accurate on the attacks that matter to your team.

What is CHEQ?

CHEQ is a go-to-market security platform founded in 2016 and headquartered in Tel Aviv. It positions itself as protecting the entire go-to-market operation, paid campaigns, web forms, analytics, and digital properties, from invalid traffic, bots, fake leads, data contamination, and client-side threats. CHEQ states it is trusted by more than 15,000 companies, from emerging brands to the Fortune 50, and it acquired the click-fraud product ClickCease (now CHEQ Essentials) in 2020 to serve the SMB market alongside its enterprise platform.

CHEQ's enterprise platform is organized into several products: CHEQ Acquisition (protecting paid marketing investment from invalid traffic), CHEQ Form Guard (defending web forms from fake leads), CHEQ Analytics (surfacing invalid-traffic impact), CHEQ Manage (governing first- and third-party tags and scripts), CHEQ Enforce (privacy and consent enforcement), and CHEQ Agent Intent (identifying and assessing visitors, including AI agents). It is a mature, well-funded vendor, having raised a reported $182M+ from investors including Tiger Global and Hanaco Ventures.

How CHEQ works

CHEQ describes a "triple-layer" intelligence engine spanning Traffic Intelligence (device fingerprinting, browser and network analysis, behavioral anomalies), Trust Intelligence (script and tag assessment within sessions), and Identity Intelligence (identity-graph resolution and synthetic-identity detection). It runs over 2,000 cybersecurity challenges per session to classify entities into humans, bots, and AI agents, then applies proportional enforcement, allow, monitor, challenge, throttle, or block.

For the client-side layer specifically, CHEQ deploys a lightweight JavaScript tag that monitors scripts and code executing in visitors' browsers, identifies first- and third-party technologies, and detects skimmer/Magecart-style behavior on payment pages and sensitive forms in real time. CHEQ Manage extends this into tag governance, detecting unauthorized scripts and data-leakage signals, and supports both client-side and server-side deployment, integrating with CDN, WAF, and analytics platforms. CHEQ publishes educational content mapping these client-side capabilities to PCI DSS 6.4.3 and 11.6.1.

Two things follow from this design that matter for a buyer weighing CHEQ against cside. First, CHEQ's breadth is real but ad-fraud-centric: the platform's primary, best-developed job is protecting paid campaigns and lead funnels, with client-side script security as one module among several. Second, CHEQ's client-side signal runs through its own tag (with optional server-side deployment), which is a different architecture from collecting signals through the customer's own first-party JavaScript.

How cside fits

cside isn't an ad-fraud or click-fraud product, and we won't pretend otherwise, if protecting Google or Meta ad spend is your problem, CHEQ is built for that and cside is not. What cside does is the client-side security, PCI, and first-party-signal layer, with a narrower and deeper focus.

cside deploys as a single first-party script tag, no proxy, no reverse proxy, no CDN or DNS dependency, and collects device and behavioral signals from your own first-party JavaScript. On bot and AI-agent detection it reads in-session behavior on the live page, mouse-movement patterns, scroll behavior, and typing cadence, alongside device fingerprinting at 99.7% accuracy across 250+ signals, plus integrated AI agent detection and classification. Because there is no separate third-party collector origin, there is nothing for a filter list to strip or for a fraudster to detect and feed, and you get full session visibility with zero added latency. cside also adds a signal CHEQ 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. cside gives you evidence you own, usable in chargeback disputes through our Chargebacks911 integration.

On the layer where cside and CHEQ most directly overlap, client-side script monitoring, cside's emphasis is QSA-ready PCI evidence. cside inventories, justifies, and tamper-monitors every script on your payment pages to satisfy PCI DSS 6.4.3 and 11.6.1, with reports that are QSA-ready and VikingCloud-validated and accepted by leading QSAs, backed by SOC 2 Type II, ISO 27001, and GDPR compliance. CHEQ markets script monitoring against the same requirements; cside leads with the independent QSA validation and published, self-serve pricing. Many teams run a go-to-market security platform for ad and lead protection and cside for payment-page script governance; if that PCI / first-party-signal layer is your gap, that's where cside fits.

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Related resources

Founder & CEO Simon Wijckmans

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.

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FAQ

Frequently Asked Questions

Partly. CHEQ and cside overlap on the client-side layer, both run a JavaScript tag in the visitor's browser, both do device/traffic intelligence, both classify bots and AI agents, and both market a client-side script-monitoring capability. But their center of gravity is different. CHEQ is a go-to-market security platform: its primary job is protecting paid marketing spend, web forms, and campaign analytics from invalid traffic, fake leads, and bots across Google, Meta, and Microsoft Ads. cside is built around client-side security and PCI DSS 6.4.3 / 11.6.1 script monitoring plus first-party device signals. If your gap is ad-fraud and lead-quality, CHEQ does things cside does not. If your gap is QSA-ready payment-page script governance, that's cside's core.

CHEQ markets a client-side product line, CHEQ Manage (tag governance) and a client-side website attacks solution, that inventories first- and third-party scripts, detects unauthorized scripts and skimmer behavior on payment pages, and publishes educational content mapping these capabilities to PCI DSS 6.4.3 and 11.6.1. So CHEQ is a genuine player on this axis, not absent from it. Based on publicly available information, what we did not find on CHEQ's product pages is an explicit QSA-validated PCI attestation. cside's PCI reporting is QSA-ready and VikingCloud-validated, and accepted by leading QSAs, that independent validation is the difference cside leads with, rather than a claim that CHEQ does not address these requirements.

CHEQ deploys via a client-side JavaScript tag in the visitor's browser, and like any vendor's tag it can be affected by privacy extensions or filter lists depending on how it loads. CHEQ also supports server-side deployment for parts of its platform, which is not exposed to client-side blocking. cside takes a different approach: signals are collected from the customer's own first-party JavaScript on the customer's domain, so there is no separate third-party collector origin for a filter list to strip or for a fraudster to detect and feed. This is an architectural difference, not a claim that CHEQ's signal is unreliable.

Yes. CHEQ explicitly addresses AI agents through its Agent Intent product and markets solutions for agentic commerce and LLM/AI-agent governance, including enforcement actions (allow, monitor, challenge, throttle, block). cside also ships integrated AI agent detection and classification. Both vendors treat agentic traffic as a first-class category, so this is an area of overlap rather than a clear differentiator for either side.

Both classify bots and AI agents from a client-side tag, so this is a real overlap. The differences are in collection and signals. CHEQ runs its triple-layer engine (with optional server-side deployment) and leans on high per-session challenge volume; cside reads what bots and agents actually do inside the live browser session through your own first-party JavaScript, mouse-movement patterns, scroll behavior, typing cadence, and device signals, with no separate third-party collector origin. cside also ships an AI-generated-text detection engine that flags AI-written content in form fields (reviews, sign-ups, support messages), which CHEQ doesn't offer. For ad-fraud and lead-quality, CHEQ does jobs cside doesn't; for first-party, in-session behavioral and agent detection plus QSA-ready PCI evidence, cside is the closer fit.

CHEQ publishes self-serve pricing and a free trial for its SMB product, CHEQ Essentials (formerly ClickCease), which focuses on click-fraud protection for paid ads. CHEQ's enterprise platform, Acquisition, Manage, and the client-side security modules, is sold through sales engagement with custom quotes rather than public pricing. cside publishes pricing across its product, with a free tier and a self-serve trial, so the full product can be evaluated without a sales cycle.

It depends on the problem you're solving, and many teams could use both. Choose CHEQ if your priority is protecting ad budget from click fraud and invalid traffic, cleaning up fake leads in your funnel, or governing paid-campaign analytics, that is CHEQ's home turf. Choose cside if your priority is QSA-ready PCI DSS 6.4.3 / 11.6.1 script monitoring on payment pages, first-party device signals with no third-party collector, and seeing exactly what scripts and AI agents do in real sessions. They are not the same tool, and we say so on this page.

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