Nelli
Nelli is a video and audio seizure monitoring system that detects, classifies and quantifies motor seizures without EEG or wearables. Machine learning flags events, a credentialed human expert confirms them, and clinicians review an interactive report.
What is Nelli?
Nelli is a video and audio epilepsy monitoring system built by Neuro Event Labs Oy, a Finnish digital health company based in Tampere. It is designed to answer a question that seizure diaries and short hospital stays answer badly: how many seizures a patient actually has, of which type, and when. The hardware side is a Personal Recording Unit, a small computer with a camera and a microphone placed above the bed. Nothing is worn by the patient, no electrodes and no sensors, and no Wi-Fi or cable is needed because the unit carries its own modem. Recordings are pre-processed on the unit itself to keep only periods likely to contain clinically relevant activity, held there temporarily in encrypted form, then sent over a secure channel to cloud infrastructure running on Amazon Web Services, inside a private network with no public internet access. Machine learning algorithms identify events indicative of motor seizures, and a human expert, from either the hospital team or Neuro Event Labs, confirms the algorithmic findings. Results reach the physician as an interactive report on a web dashboard, with the video of each event and a downloadable PDF. Recordings typically run from 14 to 28 days and can extend from a few days to several months, which is what makes rare night-time events visible. Three use cases are put forward: prescreening before admission to an epilepsy monitoring unit, differential diagnosis and quantification, and assessment of treatment effect. The clinical evidence is published. A European in-hospital study validating Nelli against video-EEG in 230 patients aged 0 to 80 reports 88% sensitivity for all motor seizures, 95.2% for convulsive seizures and 6.48 false detections per hour. A second study of 104 patients monitored for an average of 29 days reports more than 86% clinical decisions and 68% therapeutic interventions or adjustments. Nelli is a regulated medical device: CE marked as Class IIa under EU Regulation 2017/745, cleared by the FDA under 510(k) in November 2025 for hospital use after a Breakthrough Device designation, and registered in the United Kingdom. It is in use in more than 30 hospitals.
What it does
- Detect events indicative of motor seizures automatically from video and audio recordings
- Classify and quantify seizure types across weeks or months of continuous monitoring
- Have algorithmic findings confirmed by a credentialed human expert before they reach the physician
- Deliver an interactive report with the video of each detected event, exportable as PDF
- Monitor patients at home or in a hospital bed with no wearable sensors of any kind
- Derive vital measures such as breathing rhythm and pulse alongside movement analysis
- Add manual clinical annotations and track every access to patient data for audit
When to use Nelli / When not to
A quick filter to help you decide if Nelli is the right fit.
When to use Nelli
- Neurologists and epileptologists running epilepsy monitoring units who need objective seizure counts instead of patient diaries
- Hospitals looking to shorten EMU waiting lists by extending monitoring to home and general ward beds
- Paediatric and adult epilepsy teams handling long recordings, from two weeks to several months, to capture infrequent night-time events
- Care teams monitoring people with intellectual disabilities, where seizures must be separated from other behaviours
- Clinical researchers and study sponsors who need quantified, reproducible seizure outcome data for treatment-effect work
When not to use Nelli
- Anyone looking for a consumer wellness or sleep tracker: Nelli is a prescription-only regulated medical device
- Clinicians who need to characterise non-motor seizures, such as absences or focal seizures without movement
- Teams expecting an EEG replacement: Nelli analyses video and audio, it does not record brain activity
- Buyers outside the United States, the European Union and the United Kingdom, where the system is not offered
- Organisations that need published pricing, public terms of service or an API before they will start a procurement process
How to use Nelli
A typical end-to-end flow, from setup to results.
- A physician prescribes a Nelli recording for the patient and defines the examination period
- The Personal Recording Unit is installed above the bed, at home or in the hospital room
- No wearable is fitted to the patient, and no Wi-Fi or cable is required: the unit connects through its built-in modem
- At home, the patient or a caregiver starts and stops the recording manually; starting one when a seizure feels imminent is recommended
- In hospital, the unit starts and stops automatically on a schedule set by the ward staff
- The patient behaves as usual and may leave the room; the system is designed not to interfere with daily activities
- The unit pre-processes and encrypts the media, then transmits it to the cloud, where it runs through a series of algorithms
- A credentialed human expert, from the hospital team or from Neuro Event Labs, confirms the algorithmic findings
- The clinician opens the interactive report on the web dashboard, reviews each detected event and its video, and adds annotations
- The report is exported as a PDF and used as a medical record for treatment decisions
Pros & Cons
Pros
- No wearables and no electrodes, which removes the discomfort that limits long video-EEG monitoring
- Works at home as well as in hospital, avoiding admission and travel for many patients
- Recording periods of weeks to months capture infrequent night-time events that a short unit stay misses
- Algorithmic detection is confirmed by a human expert before results reach the physician
- Backed by independent peer-reviewed studies in Epilepsia, Frontiers in Neuroinformatics and Epilepsy & Behavior
- Certified as a medical device across three jurisdictions, with CMS reimbursement approved in the United States for fiscal year 2027
- No tracking cookies, encryption at rest, TLS in transit and a private network with no public internet access
Cons
- No pricing whatsoever is published: no pricing page, no plans, no figures anywhere on the site
- There is no terms and conditions page, no legal notice and no publicly readable contract
- No API, no technical documentation and no named third-party integration, including with electronic health records
- Coverage is limited to seizures with a motor component; non-motor seizures are out of scope
- The hosting location is described only as the geographically optimal AWS data centre, with no country or region named
- The DPO and Security Officer email addresses in the privacy policy sit on a domain that does not exist, so they are unreachable
- EU and UK software user guides are listed as "No files available yet", and the privacy policy predates both the MDR certification and the FDA clearance
Pricing & Plans
No price is published. Neuro Event Labs operates a contact-sales model: there is no pricing page, no plan list and no figure on any of the pages reviewed, and in the United States the device is restricted to sale by or on the order of a physician. Buyers should expect a quotation covering hardware, software and optionally the expert review service, negotiated per institution. There is no free plan and no free trial. One published figure should not be mistaken for a price: under the CMS New Technology Add-On Payment programme, eligible Medicare inpatient cases involving Nelli may qualify for a maximum additional payment of 975 USD per case from 1 October 2026. That is a reimbursement paid to the hospital, not the vendor's tariff.
Data, GDPR & hosting
A consolidated view of how Nelli handles your data.
GDPR overview
The privacy policy, last updated on 3 May 2023, states explicitly that Neuro Event Labs follows applicable data protection law including the EU General Data Protection Regulation and the US HIPAA Security and Privacy Rules. Data subjects are told they may verify their data, request rectification, withdraw consent and ask for erasure, with the caveat that other legislation may require retention. Requests must be made in writing or by email, signed, and addressed to the Data Protection Officer. A DPO and a Security Officer are both named. One practical warning: the two email addresses published for them sit on a domain that is not registered, so mail sent there cannot be delivered. As the company is established in Finland, no Article 27 representative is required and none is designated.
Who owns the data?
Neuro Event Labs states that it acts as a data processor and takes no legal ownership of the raw recordings. Depending on the jurisdiction, control sits either with the customer organisation, for example as part of public health records, or with the patient. Access is restricted to clinicians from the customer organisation and to assigned Neuro Event Labs staff providing the review service, each contractually bound to confidentiality, with every read and write to patient data logged for audit. The vendor keeps a distinct claim over derived summary biomarker data: once detached from the patient profile it is treated as non-identifying and described as an artefact of the Nelli system, retained under terms agreed with each customer.
Reuse rights
Patient data is collected for one declared purpose: producing the Nelli examination report, which serves as a medical record for the requesting clinician. User data on doctors and clinicians covers identification, access rights and full activity logging for audit. The privacy policy states that no personally identifiable information is retained or transferred to any third party beyond the data processors it names. The end customer does not get a blanket right to reuse anything without agreement: the terms governing derived data are negotiated with every customer. The one reuse the vendor claims for itself is de-identified derived biomarker data, kept for the continuous improvement and quality assurance of the Nelli system. No tracking cookies are used, only functional ones to maintain a secure session.
Data retention & training
Hosting summary
The Nelli system runs on Amazon Web Services, named in the privacy policy as a data processor and described as compliant with HIPAA requirements for Protected Health Information under the AWS shared security responsibility model. Personal data is stored encrypted at rest and travels over TLS 1.2 between processing steps, and storage and processing take place in a private network with no public internet access. The recording unit itself keeps media only temporarily, in encrypted form, before transmission. The important limitation is that no jurisdiction is committed to: the policy states only that personal data is stored and processed in the geographically optimal AWS data centre in relation to customer operations, so the country depends on the customer and is not published. Neuro Event Labs' own business data, as opposed to Nelli clinical data, is handled through Google services, namely Gmail and Google Drive. Note that the marketing website is served from a German AWS address, which says nothing about where clinical recordings are held.
Where Nelli works
Country-level availability.
Available in
Not available in
Things to keep in mind
Risks and trade-offs to weigh before adopting Nelli.
- The DPO and Security Officer addresses printed in the privacy policy are on a misspelled domain that is not registered, so GDPR requests sent there are silently lost; use the main contact address instead
- No terms and conditions are published, so the contract that will actually govern patient data cannot be read before a commercial discussion
- No hosting country or region is named, only the geographically optimal AWS data centre, which may place recordings outside the EU depending on the customer
- De-identified derived biomarker data is retained for continuous improvement of the system under terms negotiated per customer: check what was agreed before signing
- No retention period is published for patient recordings, only for job applications and business contacts
- Approvals held by client hospitals, NIHR project funding and the HIPAA compliance of the cloud provider belong to third parties, not to Neuro Event Labs, and should not be read as vendor certifications
- Objective seizure counts can create false reassurance for non-motor events the system does not target, and clinical judgement still has to sit above the algorithm
Setup & Integrations
Technical difficulty
Technically this is easy: nothing is installed on the customer's machines, the interface is a web dashboard, and the recording unit ships ready to work with its own modem, so no Wi-Fi credentials or cabling are required. It is simply placed above the bed. The real effort is organisational rather than technical: a physician's prescription, a contract with the institution, and the governance work that any Class IIa medical device handling protected health information brings with it. In hospital, ward staff also need to configure the recording schedule.
Deployment
Supported languages
Behind Nelli
Fundraising
Resources
All the official URLs gathered for verification and reference.
Frequently asked questions
What does Nelli actually do?
Does the patient have to wear anything?
Where is the data stored and how is it protected?
Who is allowed to see the videos?
How long does a recording last?
Does the recording unit need Wi-Fi or a cable?
In which countries is Nelli available?
What is its regulatory status?
Does Nelli replace an EEG?
How much does it cost?
Should you pick Nelli?
Nelli is one of the most clinically substantiated tools of its kind. It answers a real and well-documented problem, namely that seizure diaries are unreliable and epilepsy monitoring units are scarce, and it does so with a genuinely non-invasive method: a camera and a microphone above the bed, nothing worn by the patient, and recordings that can run for weeks. The evidence base is unusually strong for a young medical AI product, with independent peer-reviewed studies from Danish, Swedish, Finnish and British centres, and the regulatory path is complete rather than aspirational: Breakthrough Device designation, CE Class IIa under the MDR, FDA 510(k) clearance and a CMS reimbursement pathway in the United States. What the buyer will not find is commercial transparency. There is no price, no plan, no terms of service and no legal notice on the site. There is no API and no named integration with hospital systems, which matters for anyone planning a deployment across an estate. The hosting country is never named, only described as the geographically optimal AWS data centre, and no retention period is published for patient recordings. The privacy policy dates from May 2023 and has not been refreshed since either the MDR certification or the FDA clearance, and the two email addresses it gives for the DPO and the Security Officer sit on a misspelled domain that is not registered at all. None of this undermines the device, but it does mean the due diligence happens in a meeting rather than on the website. For a neurology department that already knows it needs objective seizure quantification, Nelli is worth the conversation. For anyone hoping to evaluate it independently before contacting the vendor, the public information stops well short.
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