Introducing MobiXournal: A native, stylus-first Xournal++ (.xopp) editor with full round-trip fidelity & built-in STEM tools for Android

Hi everyone! 👋

I'm excited to share the initial v1.0.0 release of MobiXournal, an independent, open-source Android companion for Xournal++ (https://github.com/xournalpp/xournalpp).

Like many of you, I use Xournal++ daily on Linux for notes and lecture slides. However, working with `.xopp` files seamlessly on an Android tablet without losing formatting or relying on clunky conversions has always been a pain.

MobiXournal is a continuation and modern overhaul of Brian Monroe's NeXopp, rewritten and polished to be a daily driver for tablets and phones.

https://preview.redd.it/o3jg3l697hth1.jpg?width=1280&format=pjpg&auto=webp&s=dd9b538285053bde976bbc51c3682560c59f662d

# 🎯 Key Highlights

100% Round-trip Safety & Format Fidelity:

Reads and writes standard gzip-compressed `.xopp` files. You can start a document on desktop Xournal++ (Linux/Windows/macOS), annotate and sketch on your Android tablet, and reopen it on the desktop without losing strokes, layers, text, images, or PDF backgrounds.

Stylus & S-Pen First: Built with low-latency stylus drawing, pressure sensitivity (`MotionEvent`), palm rejection, and customizable barrel button actions (eraser, lasso/selection).

\---

Purpose-Built for STEM (Science, Technology, Engineering & Math)

Tired of sketching wobbly schematics during lectures? MobiXournal includes a dedicated technical toolset:

Electronics: Resistors, capacitors, inductors, and ground symbols.

Digital Logic: Full standard logic gate suite (AND, NAND, OR, NOR, XOR, XNOR, NOT).

Relational DB Tables: Schema tables with row/column controls and primary key styling.

Math & Geometry: Coordinate axes, parametric splines, regular polygons, plus virtual drafting tools (Setsquare, Compass, Protractor).

On-Device LaTeX: Integrated LaTeX formula editor with a quick-access STEM symbol palette.

(All rendered directly as native \`.xopp\` strokes so they look identical when reopened on desktop!)

---

Productivity & Multitasking

Multi-Document Tabs: Keep multiple files open simultaneously.

Split-View & Live Mirroring: Open two documents side-by-side (e.g., lecture slides on the left, scratchpad on the right), or mirror the same document to view the top and bottom at the same time.

PDF & Text Annotation: Open and annotate PDFs in-place or typeset plain `.txt` and `.md` (Markdown) files into annotatable pages.

\---

# 📦 License & Links

License: GNU General Public License v2.0 or later (GPL-2.0-or-later).

GitHub Repository: https://github.com/amarzano2005/MobiXournal

Download APK (v1.0.0 Release): https://github.com/amarzano2005/MobiXournal/releases/tag/v1.0.0

\---

I would love to hear your feedback, bug reports, and suggestions! If you test it on your tablet (especially Samsung Galaxy Tab with S-Pen, Onyx Boox, or Lenovo devices), let me know how it performs for you.

Disclaimer: MobiXournal is an independent open-source project by amarzano2005 and is not officially affiliated with or endorsed by the Xournal++ team.

https://redd.it/1wxjh6p
@r_linux