CSAM investigation software is a specialist tool that helps law enforcement review and make sense of child sexual abuse material seized during digital investigations. Rather than scanning public platforms to detect CSAM, it supports investigators after evidence is seized: sorting and categorising material, prioritising the most urgent cases, identifying victims and offenders, and surfacing links between cases.
Semantics 21 builds this software specifically for child protection and Internet Crimes Against Children (ICAC) teams.
Explore our full range of CSAM / ICAC solutions.
CSAM investigations now involve huge volumes of images, videos and extracted device data. Reviewing everything manually is slow, exhausting and risks missing evidence and victim-identification leads.
Unsupported formats, failed processing and evidence that never becomes searchable create critical blind spots, and investigators can only ever act on the evidence they can actually see.
S21 VisionX is built for that operational reality: it helps teams review digital evidence faster, prioritise high-risk material, support victim-identification workflows and reduce unnecessary investigator exposure.
Explore, filter and prioritise complex CSAM datasets so the most urgent material surfaces first, while professional judgement stays in control.
Powered by S21 Discovery
The CSAM Auto-Categoriser processes large volumes of images and videos, organising material into structured review categories including CSAM, indicative content, legally held material and adult pornography.
Powered by S21 VisionX
The S21 Find Victims capability helps investigators run victim-identification searches from limited starting information and surface leads earlier.
Powered by S21 Discovery and S21 VisionX
The S21 Global Alliance Database holds over 3.5 billion law-enforcement-contributed intelligence records, connecting material across cases at global scale.
Powered by the S21 Global Alliance Database
Face and body-part detection, deepfake detection, AI location prediction, visual and colour search, school badge lookup and AI Describe help investigators find and understand key material faster.
Powered by S21 VisionX
Built-in monitoring reduces unnecessary exposure to traumatic material and gives supervisors oversight of team wellbeing.
Powered by S21 Investigator Wellbeing
S21 VisionX helps investigators review large volumes of image and video evidence, identify visual connections and prioritise the material that matters most. Built for investigator-led workflows, it brings similarity detection, grouping and prioritisation together with AI tools including the CSAM Auto-Categoriser, deepfake detection and AI location prediction. Pool Mode lets teams review together, and everything runs fully offline and secure.
S21 Discovery is built for rapid frontline triage, helping investigators explore, filter and prioritise complex CSAM evidence and surface relevance faster while keeping professional judgement in control. It needs no servers or specialist hardware, runs fully offline, and includes the S21 Find Victims capability and automated CSAM categorisation to support early victim identification.
The S21 Global Alliance Database (GAD) helps authorised investigators surface cross-case intelligence at scale, drawing on over 3.5 billion law-enforcement-contributed intelligence records from trusted partners worldwide. It prioritises material linked to known intelligence and supports earlier victim identification. Access is provided through S21 VisionX, S21 Discovery and authorised partner environments, and is restricted to law enforcement and approved related organisations.
Reviewing CSAM takes a serious toll on investigators. S21 Investigator Wellbeing monitors exposure trends, gives investigators in-app personalised insights and gives supervisors a management console with customisable reporting, so teams can reduce unnecessary contact with traumatic material and support healthier long-term investigative practice.
Semantics 21 tools are used by specialist investigative teams worldwide, including British Transport Police, the Metropolitan Police, HM Revenue & Customs, the Royal Canadian Mounted Police and the U.S. Department of Defence.
See more in our case studies.
Semantics 21 was founded in 2015 on a simple belief: every victim matters. The team combines digital forensics, AI research and frontline policing experience to build tools that help investigators rescue victims faster.
Review large volumes of image and video evidence, identify visual connections and prioritise the material that matters for CSAM investigations.
Rapid frontline triage that helps investigators explore, filter and prioritise complex CSAM evidence and surface leads faster.
Review, enhance and analyse CCTV and digital video evidence up to 400 times faster than manual review.
Secure offline transcription of audio and video evidence, so investigators can search and report spoken content without the cloud.
Automate repetitive forensic processing, from imaging to data carving, to move evidence from raw to review-ready faster.
Surface cross-case intelligence at scale, drawing on over 3.5 billion law-enforcement-contributed intelligence records.
CSAM investigation software helps law enforcement review and understand child sexual abuse material seized during digital investigations. It supports investigators after evidence is seized by triaging and categorising material, prioritising urgent cases, identifying victims and offenders, and surfacing links between cases.
No. Platform-side CSAM detection scans uploaded content to stop CSAM spreading online. Semantics 21 software supports law enforcement after evidence is seized, helping investigators triage, categorise and understand CSAM evidence and identify victims.
Yes. All of Semantics 21's CSAM tools run fully offline, with no need for servers or specialist hardware, so sensitive evidence never leaves your environment and is never exposed to cloud-based AI.
The CSAM Auto-Categoriser in S21 VisionX processes large volumes of images and video and organises them into structured review categories including CSAM, indicative content, legally held material and adult pornography, reducing repetitive manual review.
Yes. The Find Victims capability within S21 VisionX lets investigators run victim-identification searches from limited starting information, and the S21 Global Alliance Database surfaces connections across cases to support earlier identification.
Access is restricted to law enforcement and approved related organisations, and is offered to all S21 VisionX and S21 Discovery customers.
ICAC (Internet Crimes Against Children) software supports task forces investigating online child exploitation. Semantics 21 tools support ICAC and child protection teams with triage, categorisation, victim identification and cross-case intelligence.
Yes. Semantics 21 includes deepfake detection to help investigators identify manipulated and synthetic imagery as part of the review workflow.
S21 Investigator Wellbeing monitors exposure trends and reduces unnecessary contact with traumatic material, with personalised insights for investigators and oversight for supervisors. S21 VisionX also offers many welleing features to help investigators while they work on a case.
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