Rudi Kundini, Pamoja Kundini (RKPK): study protocol for a hybrid type 1 randomized effectiveness-implementation trial using data science and economic incentive strategies to strengthen the continuity of care among people living with HIV in Tanzania.

"all primary and secondary outcomes are pre-registered and included in the trial statistical analysis plan (clinicaltrials gov; open science framework).; public access to the participant-level dataset of main trial results and statistical code will be made available via the trial registration profiles on clinicaltrials gov and open science framework."

"Declarations Ethics approval and consent to participateThe study was approved by the University of California Berkeley Human Research Protection Program and the National Institute of Medical Research (NIMR) in Tanzania. All participants will provide informed consent in their preferred language to participate in the study. Consent for publicationNot applicable. Competing interestsThe authors declare that they have no competing interests. Competing interests The authors declare that they have no competing interests."

"Funding This study is supported by a grant from the US National Institutes of Health (NIH): NIH NIMH 1R01MH125746 (SM)."

"Trial registration Phase 1: ClinicalTrials.gov, NCT05248100, registered 2/21/2022. Phase 2: ClinicalTrials.gov, NCT05373095, registered 5/13/2022."