Pydroid 3 Alternative with JavaScript, SQL and Java

If you like Pydroid 3 but also need JavaScript, SQL or Java on Android, Pocket Compiler: Run Code is an alternative that runs Python, JavaScript, HTML and SQL offline and Java for free, in one app with no account. Pydroid 3 remains a strong choice if Python is all you write; this post compares the two honestly.

Side by side

	Pydroid 3	Pocket Compiler: Run Code
Python offline	Yes	Yes
Python packages	pip, with prebuilt packages	From `requirements.txt`: pure-Python plus numpy, pandas and other supported ones
JavaScript	No	Yes, free
HTML live preview	No	Yes, free
SQL (SQLite) with results table	No	Yes, free
Java	No	Yes, free (one-time download)
C, C++, PHP, React	No	Yes (one-time download each)
GitHub clone and run	No	Yes (5 clones free)
Terminal	Yes	Yes: git, python, node, sqlite3
Ads / paid tier	Ads plus premium	Free to download; some features are part of an optional upgrade
iPhone version	No	Yes: Python, JavaScript, HTML, SQL

Feature details for Pydroid 3 come from its store listing; check it for the current state.

When Pydroid 3 is the better pick

You only write Python and want a mature, Python-focused IDE.
You rely on packages with native code that Pocket Compiler does not support.
You run longer Python programs: Pocket Compiler stops free runs at 5 seconds and Pro runs at 20.

When Pocket Compiler fits better

Your course mixes Python, SQL and Java, or Python and web (HTML/JavaScript).
You want to clone a GitHub repo and run it on the phone.
You also use an iPhone or iPad: the same app is on the App Store (Python, JavaScript, HTML and SQL there).
You like learning from short videos: our Shorts show a code such as J1, and typing it opens that program, ready to run (J1: why "hi" == "hi" can be false in Java).

Moving your Python files across

Install Pocket Compiler: Run Code.
In your file manager, long-press a .py file and choose Open with, then Pocket Compiler. (Or create a new file and paste.)
Tap ▶ Run. Programs that call input() read from the input box.
If the project has a requirements.txt, install its packages from the prompt.
Check anything that uses packages with compiled parts; numpy and pandas are supported.

Try SQL and Java next to Python

CREATE TABLE users (name TEXT, email TEXT);
INSERT INTO users VALUES ('Asha', 'asha@mail.com'), ('Ravi', NULL);
SELECT COUNT(*) FROM users WHERE email = NULL;   -- 0
SELECT COUNT(*) FROM users WHERE email IS NULL;  -- 1

public class Main {
    public static void main(String[] args) {
        String a = "hi";
        String b = new String("hi");
        System.out.println(a == b);       // false
        System.out.println(a.equals(b));  // true
    }
}

Frequently Asked Questions

Is there a Pydroid 3 alternative that also runs JavaScript?

Pocket Compiler runs Python and JavaScript (plus HTML, SQL and Java) offline on Android, free with ads.

Does Pocket Compiler support numpy and pandas?

On Android, yes, installed from a requirements.txt. On iPhone, package installs are pure-Python only.

Can I run Java without internet on Android?

In Pocket Compiler, after a one-time download, yes.

Is there a Pydroid 3 for iPhone?

Pydroid 3 is Android only. Pocket Compiler is on both Google Play and the App Store.

Does my code leave the phone?

No. Pocket Compiler stores and runs your code on the device. The optional COSMO AI (Android, 18+) only sends what you choose to send.

Full details: Pocket Compiler page.

~/cosmovex/untitled.md unsaved

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Meanwhile, the toolkit

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A Markdown editor good enough to write its own homepage.

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✓Version History — every save snapshotted; browse and restore

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## Just shipped

Both offline-first, both free to try.

NEWAspenote: Offline Voice to TextIt writes it down. On your phone.Runs Offline · Nothing Uploaded · Summary & Actions

NEWHostPilot: PHP Server & SQLTurn your phone into a web server.PHP 8.4 & SQLite · Stays Running · SQL Console

## The rest of the toolkit

One app per job. No 200 MB do-everything bloat.

App	Job	Rating
Markdown Editor & MD Viewer	Write and preview Markdown on mobile.	4.7★ · 5K+	install ios
WebEva: Build Websites & Code	Build websites from your phone.	4.4★ · 5K+	install ios
PDF Viewer & Editor - AI	Edit, convert & sign PDFs on mobile.	4.9★ · 1K+	install ios
HTML Viewer & Editor - Code	View & edit HTML on mobile.	4.6★ · 1K+	install ios
SQLite Editor & SQL Learner	Manage SQLite databases on mobile.	5.0★ · 1K+	install
Python IDE - Offline Compiler	Write and run Python on your phone.	4.1★ · 1K+	install
Aspenote: Offline Voice to Text	It writes it down. On your phone.	—	install
HostPilot: PHP Server & SQL	Turn your phone into a web server.	—	install
DevBuddy: Offline Dev Toolkit	Your pocket developer toolkit.	—	install ios
ShellPilot - Batch SSH Client	SSH terminal & SFTP on the go.	— · 1K+	install ios
API Client -REST & HTTP Tester	Test APIs anywhere, anytime.	— · 500+	install ios
JSON Editor - Viewer & Format	View, edit & format JSON instantly.	— · 500+	install ios
Java & Kotlin Compiler IDE	Write and run Java on your phone.	4.4★ · 1K+	install
XML Viewer & Editor	View, edit & validate XML on mobile.	— · 5K+	install ios
Open CSV — Viewer & Editor	Open and edit CSV files on mobile.	— · 500+	install ios
JavaScript Editor — React IDE	Run JavaScript and React on your phone.	— · 1K+	install
Image to SVG Converter, Viewer	Convert images to SVG and edit vectors on mobile.	— · 1K+	install
YAML / YML Viewer & Editor	View, edit & validate YAML instantly.	— · 500+	install
Network Toolkit: WiFi IP Tools	Network utilities and diagnostic tools.	— · 500+	install
Code Editor - Text & Notepad	Edit text files on mobile.	— · 500+	install
C / C++ Compiler IDE	Compile & run C and C++ on your phone.	—	install
Diagram Maker: Flow & ERD	Draw flowcharts & ERDs on mobile.	—	install
QR Scanner & Generator	Scan codes with confidence	—	install
Zip Extractor — Unzip RAR 7Z	Open ZIP, RAR, and 7Z files	—	install
PromptCrate: AI Prompt Manager	Your personal AI prompt library	—	install

## Free web tools

Background Remover Snapglow SQLite Viewer QueryDrill

## Questions, answered

Is there a free Markdown editor for Android?

Yes — Markdown Editor & MD Viewer is free on Google Play. It gives you a split-view editor with live preview, syntax highlighting, and HTML/PDF export, and it works fully offline with no account.

Can I edit Markdown from my phone on a desktop browser?

Markdown Editor & MD Viewer includes a Live Server: your phone hosts the document over Wi-Fi and you edit it from any desktop browser with two-way live sync. The file never leaves your device.

Can I make Mermaid diagrams on Android?

Yes — the built-in Mermaid Studio turns plain text into flowcharts, sequence and class diagrams, with pan/zoom and SVG export, right on your phone.

Can I turn Markdown into slides or a PDF on my phone?

Presentation Mode turns any Markdown document into a fullscreen slide deck, and export produces styled HTML or print-ready PDF — all generated on-device.

## From the journal

We're a small studio with one rule: each app does a single job well, works offline, and never asks who you are.