Construct
Small, signed tools for your Android phone.
Install only what you need. Decide what each tool may access. Use local tools offline, and choose when to connect.
Get started
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Install the app
Get the APK from GitHub Releases. Already using Construct? Install the new build over it; your tools and their data stay in place.
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Refresh the catalog
Open Browse and tap Refresh catalog. A fresh install already points at this catalog, so there is nothing to type.
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Install a tool
Pick one, read what it asks for, and tap Install. You can grant or refuse each kind of access later in Module access.
Chose a different catalog earlier? Open Settings, tap Use configured registry, then Use catalog to switch to this one.
Tools in this catalog
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Space Watch
What’s passing overhead: the ISS, Tiangong, Hubble and other bright satellites and rocket stages on a sky dome, with plain directions like “East, 1½ fists up, above Saturn”, a five-minute rewind, red night mode and details including what else went up on the same launch. The next 12 hours of visible passes, tap to preview, and fresh Starlink, Qianfan or Guowang “trains” of satellites flying in a line after launch. Positions are worked out on your phone, so your location is never sent. Orbits come from CelesTrak; Wikipedia descriptions load only when you ask. Needs alpha26 or later.
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Sky Watch
Aircraft around you, or around any place you choose, on a north-up map. Pick ADSB.lol, OpenSky or both, and a radius from 10 to 100 km. Use alpha27 or later for the current consent fixes, and approve internet access. Your chosen area goes to ADSB.lol and/or OpenSky; visible map areas go to OpenStreetMap. Optional aircraft-detail lookups send the aircraft ID and airline prefix to ADSBdb. Phone location is separately optional; manual coordinates work without it.
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Pocket Checklist
An offline checklist for up to 30 items. Nothing leaves your phone.
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Pocket Focus
A focus countdown that remembers where you left it, with an optional tone at the end.
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Pocket Contacts
Browse and search your contacts, read only. No editing, no calling, no network.
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Pocket Camera
The native camera with a private album. Gallery copies and on-device photo analysis happen only when you ask.
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Pocket Measure
Estimate a tabletop length from a photo, a printed marker and two taps.
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Pocket Tones
Short, quiet beeps on a button press. Off until you turn it on.
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Pocket Snake
Swipe or tap to play, with your best score saved. Reopening always pauses.
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Hello Module
The smallest possible tool. It exists to prove that install, update and roll back work.
Downloads contain tool code, never your data. Most tools work offline; Sky Watch needs internet for live aircraft and uncached maps, and Space Watch for its first orbit download and a refresh every few hours. What a tool can do depends on your app version and the access you grant.
Catalog address
This site is the catalog. The app reads one index file here, and every signed package next to it stays unchanged once published. If you run an older build or a self-built host, point Settings at this address and refresh Browse. No reinstall needed.