ADL Open Source LRS vs Mosra

ADL Open Source LRS stores learning data collected through the Experience API, or xAPI. The repository says this version conforms to IEEE 9274.1.1, also known as xAPI 2.0, and describes it as stable but intended for proof-of-concept use with a small number of users. It is free and distributed under the Apache License, Version 2.0.

Docker and Docker Compose are the recommended installation route. The deployment includes a Django web service using uWSGI, an nginx HTTP/HTTPS proxy, PostgreSQL, RabbitMQ, and Redis. OAuth is off by default; the project describes enabling it with the OAUTH_ENABLED setting and registering clients with the LRS. Optional webhooks can filter incoming statements and send matches to a client endpoint, and they are disabled by default. A webhook can include a secret used to send an HMAC hex digest in the X-LRS-Signature header. Celery handles activity metadata retrieval, statement voiding, and LRS hooks asynchronously. Database settings can be changed in settings.ini. The Docker guide describes an included Certbot container for obtaining a certificate for a public domain and restarting nginx to use it.

Mosra is a lesson-authoring tool for creating interactive material that can be tracked by a learning management system. Lessons can include graded questions, object states, triggers and variables without code. Question formats include multiple choice, multiple response, true/false, dropdown, short answer, essay, hotspot and drag-and-drop. Exports cover SCORM 1.2, SCORM 2004, xAPI, cmi5, PPTX, PDF, HTML5, PNG, SVG and video. A built-in Learning Record Store reports views, completions, scores and individual answers without an external LMS. Teams can co-edit in real time, comment on slides, use @mentions and set viewer, commenter or editor roles for links. Windows and macOS desktop apps support offline projects and local video export. Organizations can self-host the editor and record store with Docker Compose, but must manage backups, TLS, upgrades and uptime, and be familiar with Linux servers. The launch-period plan is free and includes unlimited lessons and listed features and exports; presentations and exports carry a “Made with Mosra” line.