The Infostealer Index · Head-to-head
LLeakCheckor
SSOS Intelligence?
Where LeakCheck and SOS Intelligence differ on infostealer intelligence, biggest gap first.
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.
S SOS Intelligence, an NCSC startup alumnus from London, offers keyword-based dark web monitoring and white-label services for MSSPs. Stealer-log matches arrive as one alert type among others.
LS
Quick take
SOS Intelligence leads by a clear margin, 40.3 to 36.9 overall. The biggest single difference is research, where SOS Intelligence scores 5 against 1. Of the nine criteria, LeakCheck is ahead on 3, SOS Intelligence on 4, and 2 are level.
Where they differ
Criteria with more than half a point between them, largest gap first.
Infostealer Research & Attribution
SSOS Intelligence +4
LLeakCheck 1
SSOS Intelligence 5
Free Tools & Free API
LLeakCheck +2
LLeakCheck 7
SSOS Intelligence 5
Infostealer Specialization
LLeakCheck +1
LLeakCheck 4
SSOS Intelligence 3
Machine-Level Infection Context
SSOS Intelligence +1
LLeakCheck 1
SSOS Intelligence 2
Exposure Segmentation
SSOS Intelligence +1
LLeakCheck 1
SSOS Intelligence 2
Collection Freshness
SSOS Intelligence +1
LLeakCheck 5
SSOS Intelligence 6
Pricing Accessibility & Time-to-Value
LLeakCheck +1
LLeakCheck 9
SSOS Intelligence 8
Where they are level
Within half a point of each other.
Capabilities
4 of 8 capabilities differ.
| Capability | LLeakCheck | SSOS Intelligence |
|---|---|---|
| Third-party / supply-chain exposure | Partial | Yes |
| Free tier / free API | Yes | Partial |
| Self-serve signup | Yes | Partial |
| Public infostealer research | No | Yes |
Same on both: Machine-level infection data (no), Session cookies & tokens (no), Employee vs. customer split (no), API access (yes).
Side by side
| Detail | LLeakCheck | SSOS Intelligence |
|---|---|---|
| Best suited to | Low-cost credential lookups and bulk checks | SMBs and MSSPs on a budget |
| Pricing | From $9.99 a month; Enterprise from $179 per quarter | From £190 a month, with a 14-day free trial |
| Headquarters | London, UK | London, UK |
| Founded | Not disclosed | Not disclosed |
| Ownership | Independent | Independent |
| Website | leakcheck.io | sosintel.co.uk |
Questions & answers
Which scores higher, LeakCheck or SOS Intelligence?
SOS Intelligence, with 40.3/100 against 36.9/100 (ranks #29 and #31).
Where do LeakCheck and SOS Intelligence differ most?
On infostealer research & attribution: LeakCheck scores 1 and SOS Intelligence scores 5.
Who is each one a good fit for?
LeakCheck suits low-cost credential lookups and bulk checks. SOS Intelligence suits sMBs and MSSPs on a budget.
More head-to-heads
Each vendor against its closest peers.
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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.