What is APT?

The Astronomer's Proposal Tool (APT) is used to write, validate, and submit proposals for the Hubble Space Telescope and the James Webb Space Telescope.

Download and Installation Instructions

Trouble installing APT? Please see Troubleshooting Tips at the bottom of each of these platform specific Installation instructions.

Current Release: 2025.3.3

APT 2025.3.3 was released on May 15, 2025 and is required for HST and JWST.

Current and previous release summary

Documentation, Training, and Support