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Background  Prior to this project, only a handful of online visualizations existed for exploring the published literature on molecular markers of antimalarial drug resistance, and none specifically for the markers associated with  Plasmodium falciparum  resistance to the partner drugs in artemisinin-based combination therapy (ACT). Molecular information is collected in studies with different designs, using a variety of molecular methodologies and data analysis strategies, making it difficult to compare across studies. The purpose of this project was to develop a free online tool, which visualizes the widely published data on molecular markers of antimalarial drug resistance, starting with the two genes  pfcrt  and  pfmdr - 1 , associated with resistance to the three most common partner drugs; amodiaquine, lumefantrine and mefloquine.    Methods  A literature review was conducted, and a standardized method was used to extract data from publications, and critical decisions on visualization were made. A global geospatial database was developed of specific  pfmdr1  and  pfcrt  single nucleotide polymorphisms and  pfmdr1  copy number variation. An informatics framework was developed that allowed flexibility in development of the tool over time and efficient adaptation to different source data.    Results  The database discussed in this paper has  pfmdr1  and  pfcrt  marker prevalence information, from 579 geographic sites in 76 different countries, including results from over 86,000 samples from 456 articles published January 2001–May 2017. The ACT Partner Drugs Molecular Surveyor was launched by the WorldWide Antimalarial Resistance Network (WWARN) in March 2015 and it has attracted over 3000 unique visitors since then. Presented here is a demonstration of how the Surveyor database can be explored to monitor local, temporal changes in the prevalence of molecular markers. Here publications up to May 2017 were included, however the online ACT partner drug Molecular Surveyor is continuously updated with new data and relevant markers.    Conclusions  The WWARN ACT Partner Drugs Molecular Surveyor summarizes data on resistance markers in the  pfmdr1  and  pfcrt  genes. The database is fully accessible, providing users with a rich resource to explore and analyze, and thus utilize a centralized, standardized database for different purposes. This open-source software framework can be adapted to other data, as demonstrated by the subsequent launch of the Artemisinin Molecular Surveyor and the Vivax Surveyor.    Electronic supplementary material  The online version of this article (10.1186/s12936-019-2645-x) contains supplementary material, which is available to authorized users.

An online mapping database of molecular markers of drug resistance in Plasmodium falciparum: the ACT Partner Drug Molecular Surveyor