Open Source Development

Extension Development This category is for questions specifically about working with MIT App Inventor's open source repository as it pertains to extension development. Anyone interested in developing an extension should start by reviewing the following documents and ask questions here if you encounter issues. Also check the parent category #open-source-development for additional troubleshooting when it comes to building the master or ucr branches. Google Summer of Code Please post your inquiries and discussions about MIT App Inventor Google Summer of Code submissions here.

Topic	Replies	Views	Activity
About the Open Source Development category Open Source Development	5	2688	January 16, 2024
Is it possible to make an extension to change app icon Extension Development	13	770	December 4, 2025
Coming soon open Mit Builder React + Blockly frontend MIT App Inventor Java backend Open Source Development	0	86	December 4, 2025
How do I install [app-engine-java] to operate mine own App Inventor instance on Debian 13? Open Source Development bug-or-problem	6	122	December 3, 2025
Proposal: Token-Based Color System Open Source Development	0	75	December 3, 2025
Contribution Inquiry for GSoC 2026 Google Summer of Code	2	101	December 3, 2025
🏃‍♂️ Fast : An Efficient Way to Build & Publish Extensions Extension Development extension-developmen , fast-cli , extension-builder	489	18897	December 1, 2025
Need Help: Local Build Failing (Bug #3204) – GWT compile “Java returned 137” on 4GB RAM Open Source Development bug-or-problem	2	94	November 28, 2025
About EV calling Extension Development	2	79	November 24, 2025
about rive runtime anrid Extension Development arduino , canvas , animation , extensions , firebase	1	146	November 23, 2025
New feature, default values for properties and functions Open Source Development	9	97	November 22, 2025
Request for help on creating a clock Extensions Extension Development clock , extensions	3	290	November 22, 2025
The Mist Project: AI and Syntax Integration for App Inventor Open Source Development	24	1900	November 13, 2025
Workspace Multiselect Plugin: Listen for selection events and query selected Blocks Open Source Development	1	118	November 12, 2025
New Contributor — Need Guidance to Start Contributing to MIT App Inventor Open Source Development	1	112	November 11, 2025
Multiple image Picker Extension After image pick event not work Please Help me How To Fix It Extension Development	4	95	November 6, 2025
Should I use Niotron IDE or not? Extension Development faq	5	416	November 8, 2025
Rush • A new and improved way of building extensions Extension Development extension-developmen , extension-builder	563	49270	October 30, 2025
Will MIT App Inventor participate in GSoC 2026? Google Summer of Code	6	323	October 30, 2025
[FREE] EIDE - Extension IDE create your extension on Android Extension Development	39	5208	October 29, 2025
The Wait Is Over: All new AI2 Extension Studio Extension Development extensions , extension-developmen , extension-builder	5	348	October 25, 2025
Build Error: DX returned an error code Open Source Development	4	160	October 6, 2025
Rate my Appinventor UI Open Source Development bug-or-problem	1	188	October 6, 2025
Help for app inventor sources(Please reply) Open Source Development open-source	0	139	October 4, 2025
Log file for App Inventor build error Open Source Development	3	99	September 30, 2025
Help with ant build for appinventor-sources-old - Java returned: 137 and DX returned 1 errors Open Source Development bug-or-problem	3	234	September 23, 2025
Extension properties bug Open Source Development	6	177	September 14, 2025
Extension property "Screen" Extension Development faq	2	197	September 11, 2025
After Commit 0048cfa, the locally compiled version is blank after logging in, and some js have 404 errors Open Source Development bug-or-problem	3	220	September 8, 2025
A lot of warnings when compiling an extension Extension Development bug-or-problem	2	209	September 6, 2025