PM logo

Molecular Dynamics made simple

What is it?

ACEMD Platform is a complete and fast solution package, designed to run and analyze your molecular dynamics (MD) simulations. It includes both ACEMD and HTMD packages. ACEMD is the MD engine that runs the simulation, while HTMD is a Python package that you can use to create systems, prepare them and, once ACEMD has finished simulating those systems, analyze their trajectories.


  • ACEMD has provided a significant boost in performance, even a single GPU card out performs several hundred CPU-cores. With 10 cards we can easily generate microsecond level sampling in a few days.

    P. K. Agarwal, Ph.D., ORNL
  • ACEMD is an admirable molecular dynamics tool that clearly holds its promises.

    L. Gauthier, Ph.D., Sanofi
  • Acellera and ACEMD afforded us a straightforward new tool based on its amazing MD engine performance capable to exploit fully the latest GPU hardwares. It can be easily plugged to extra codes for a maximal versatility and no doubts remains on its usefulness for an atomic scale interpretation of biomolecular NMR data and its specific spectroscopic time-scales.

    O. Walker, Ph.D. and JM. Lancelin, Ph.D., University of Lyon
  • ACEMD is without any doubt a versatile program that exploit the full potential of MD simulations, using cost-effective hardware solutions, that can be adapted to every Molecular Modeling laboratory needs.

    D. Sabbadin, Ph.D., University of Padova
  • The combination between ACEMD and a single GTX-780 helped us to understand discrete events happening between two metastable intermediates. The combination of MD simulations and experimental data was key to achieve our goal.

    A. Perálvarez, Ph.D., Universidad Autónoma de Barcelona

ACEMD: A GPU-optimized MD engine

ACEMD is a high-performance molecular dynamics code to simulate biomolecular systems. It was specifically designed to run on Nvidia GPUs, which provides a dramatic increase in speed compared with CPU-based engines: one GPU card can outperform up to hundreds of CPU units running in parallel . ACEMD and NAMD both use very similar commands, input and output files. ACEMD has the following features and capabilities:

  • Compatible with ff99SB and charmm36 force fields
  • Supported input file formats: PDB, PSF, PRMTOP, NAMD Bincoor
  • Output file formats: PDB, NAMD Bincoor, XTC
  • Thermostat Langevin
  • Constraints and restraints M-SHAKE with RATTLE correction, positional harmonic restraints
  • Total integration with HTMD
  • Rich documentation at:

HTMD: A Python package to manipulate molecules

HTMD is a unique, molecular-specific, programmable environment to prepare, handle, simulate, visualize and analyze molecular systems. HTMD is written in Python, in order to allow scientists to easily extend it to their needs and use it in combination with their favorite Python libraries. With HTMD, it is possible to perform very complex protocols with just a few lines of code. With a single script, you can plan an entire computational experiment, starting with the preparation of the molecular structures and finishing with the analysis of its simulation, including calculating Markov state models, kinetic rates, affinities and binding pathways.


Acellera has developed a set of applications to prepare and analyze MD simulations that run on our drug discovery platform: PlayMolecule. You can try these applications online for free, or request a quote for local use. Learn more.

alejandroACEMD Platform