MLAstro Hub
OnStepX Smart Controller
Free · Designed for iPad. Not verified for macOS.
MLAstro is the wireless remote control companion for OnStep-based telescope mounts connected through SmartWebServer.
Whether you're in your backyard or at a dark-sky site, MLAstro gives you everything you need right from your phone — no laptop, no cables, no hassle.
KEY FEATURES
● Live Mount Status
See your mount's current state at a glance: tracking mode, guide rates, slew status, and connection health — all updated in real time.
● Full Directional Control
A responsive on-screen directional pad lets you nudge the mount in any direction. Adjust slew rates, start or stop tracking, and send mount utility commands with a tap.
● Home & Park
Safely home or park your mount at the end of a session with dedicated one-tap controls.
● Go-To Catalogs
Browse built-in catalogs and send your mount directly to any object:
- Messier catalog (110 objects)
- Caldwell catalog (109 objects)
- Bright Stars list
- J2000 coordinate entry for any custom target
● Target Detail & Slew
View object details before slewing, confirm the target, and watch your mount move — all from one clean screen.
● Alignment Workflow
Step through the alignment process guided by the app, so your mount points accurately every time.
● Flexible Network Setup
Supports both Access Point and Station (router) Wi-Fi modes. Save your controller's IP address and port so you're always one tap from connecting.
● Configuration & Tuning
Adjust meridian flip settings, slew limits, slew rates, tracking mode, time & location, and controller / axis parameters — all without leaving the app.
● Light & Dark Theme
Choose light, dark, or follow your system preference.
REQUIREMENTS
- An OnStep-based telescope mount controller
- SmartWebServer (or compatible TCP bridge) running on port 9998 (configurable)
- iOS 15 or later
- Same local Wi-Fi network as the mount
MLAstro is built for amateur astronomers who want a clean, capable mobile controller for their OnStep rig. No account required. No cloud. Just your phone and your mount.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Bug fixes and stability improvements
The developer, To Ngoc Khanh, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- To Ngoc Khanh
- Size
- 288.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © @MLastro 2026