The Infostealer Index · Head-to-head
IIntelligence Xor
LLeakCheck?
Where Intelligence X and LeakCheck differ on infostealer intelligence, biggest gap first.
I Intelligence X, from Prague, indexes emails, domains, IPs and wallet addresses across pastes, leaks, the darknet and the public web. Stealer-log search is on paid plans, with exports and the leaks API on higher licences.
L LeakCheck is a breach-data search engine with a web app, Telegram bot and API. Stealer-log search is limited to its Enterprise plan.
IL
Quick take
Intelligence X leads by a clear margin, 41.2 to 36.9 overall. The biggest single difference is research, where Intelligence X scores 5 against 1. Of the nine criteria, Intelligence X is ahead on 5, LeakCheck on 2, and 2 are level.
Where they differ
Criteria with more than half a point between them, largest gap first.
Infostealer Research & Attribution
IIntelligence X +4
IIntelligence X 5
LLeakCheck 1
Pricing Accessibility & Time-to-Value
LLeakCheck +3
IIntelligence X 6
LLeakCheck 9
Free Tools & Free API
LLeakCheck +2
IIntelligence X 5
LLeakCheck 7
Machine-Level Infection Context
IIntelligence X +1
IIntelligence X 2
LLeakCheck 1
Exposure Segmentation
IIntelligence X +1
IIntelligence X 2
LLeakCheck 1
Collection Freshness
IIntelligence X +1
IIntelligence X 6
LLeakCheck 5
API & Integrations
IIntelligence X +1
IIntelligence X 8
LLeakCheck 7
Where they are level
Within half a point of each other.
Capabilities
3 of 8 capabilities differ.
| Capability | IIntelligence X | LLeakCheck |
|---|---|---|
| Free tier / free API | Partial | Yes |
| Self-serve signup | Partial | Yes |
| Public infostealer research | Partial | No |
Same on both: Machine-level infection data (no), Session cookies & tokens (no), Employee vs. customer split (no), Third-party / supply-chain exposure (partial), API access (yes).
Side by side
| Detail | IIntelligence X | LLeakCheck |
|---|---|---|
| Best suited to | Researchers running selector-based leak searches | Low-cost credential lookups and bulk checks |
| Pricing | From €2,500 a year; stealer-log export from €10,000 a year | From $9.99 a month; Enterprise from $179 per quarter |
| Headquarters | Prague, Czech Republic | London, UK |
| Founded | 2018 | Not disclosed |
| Ownership | Independent | Independent |
| Website | intelx.io | leakcheck.io |
Questions & answers
Which scores higher, Intelligence X or LeakCheck?
Intelligence X, with 41.2/100 against 36.9/100 (ranks #27 and #31).
Where do Intelligence X and LeakCheck differ most?
On infostealer research & attribution: Intelligence X scores 5 and LeakCheck scores 1.
Who is each one a good fit for?
Intelligence X suits researchers running selector-based leak searches. LeakCheck suits low-cost credential lookups and bulk checks.
More head-to-heads
Each vendor against its closest peers.
See your own infostealer exposure
Rankings only go so far. Look up your domain for free and see which employees, customers and suppliers have already been hit by infostealers.
Scores are Hudson Rock's editorial opinion of each vendor's infostealer intelligence, based on public information (websites, documentation and published research) as of October 12, 2026. Only infostealer-related capabilities are assessed, not a vendor's overall quality or other products. Field averages, peer matches and comparisons are calculated from those scores.
This is general information, not a recommendation to buy or avoid any product, and it may be out of date: confirm details with each vendor. Product names and logos belong to their owners and are used only to identify them. Vendors can request a correction through Hudson Rock's contact page.