Inclusion Criteria:

• Adults aged 18 years or older.
• Chronic kidney disease (CKD) stage 4 or 5 with estimated glomerular filtration rate (eGFR) <30 mL/min/1.73 m².
• Followed in a nephrology department within a structured care pathway that includes nutritional assessment.
• Clinical indication or need for nutritional assessment as part of routine care.
• Willing and able to use the URIKI device for nutritional assessment.
• Able to understand French or English, or assisted by a caregiver capable of supporting device use and understanding study procedures.
• Agreement to the use of the device and to the collection and transmission of study-related data.
• Affiliation with a social security system or beneficiary of such coverage.
• Access to a compatible smartphone, a smartphone provided by IKI, or assistance from a caregiver for use of the mobile application

Exclusion Criteria:

• Pregnant or breastfeeding women.
• Severe cognitive impairment preventing understanding of study procedures or use of the application without caregiver assistance.
• Major motor or sensory impairments (e.g., blindness, hemiplegia) preventing use of the device without caregiver assistance.
• Inability to understand French or English without support from a caregiver or third party.
• Refusal of the loaned smartphone or persistent inability to use the provided equipment despite support.
• Refusal to participate in the study or withdrawal after receiving study information.
• Concurrent participation in another interventional clinical study deemed incompatible with this study, or an ongoing exclusion period related to another study.
• Individuals under legal protection (guardianship or curatorship), unless participation is authorized by the legal representative and ethics committee