PROTO
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Before you install
- If Android refuses to install the file, the system is blocking installs from unknown sources. Allow this app in Settings, then choose to install anyway when prompted.
- If you see an "incompatible version" message, the build likely targets an older CPU architecture (ARMv7) that newer phones no longer accept. Look for an ARM64 (ARMv8) build of the same version instead.
Download FAQs
What can I build in PROTO?
PROTO lets you simulate electronic circuits in real time. Its component options include logic gates, flip-flops, 7400 TTL ICs, 4000 CMOS ICs, and parts for systems such as counters and seven-segment decoders.
How does the oscilloscope work in PROTO?
PROTO includes a four-channel oscilloscope for monitoring multiple signals at the same time. It can show waveform types including sine and sawtooth waves.
What is new in PROTO version 1.52.0?
Version 1.52.0 adds the 4518 dual BCD counter and 4520 dual 4-bit binary counter. It also adds a Script IC with 32 inputs and 32 outputs, French availability, bug fixes, and stability improvements.
What does Premium Unlocked mean for this PROTO build?
Premium Unlocked is the label used for this modified build. The build still uses PROTO's real-time circuit simulation, component library, phone sensor inputs, and JavaScript support.
What Android version is required for PROTO?
PROTO requires Android 7.0 or later as a minimum requirement. The listed file size is 16.8 MB.
The download link does not work
Reload this page and start the download again — links are generated per visit and expire. If it still fails, the file may be getting replaced with a newer build; try again shortly.
It says "App not installed"
That usually means a different signature of the same app is already on the device. Uninstall the existing copy first, then install this file. Back up in-app data beforehand, since uninstalling clears it.
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