MemTest86+ vs Piston

MemTest86+ is a free, open-source stand-alone memory tester for x86, x86-64, ARM AArch64, and LoongArch64 computers. It uses algorithms including moving inversions and Modulo-20 to detect memory failures and investigate crashes, freezes, or system instability. The tester can access almost all computer memory without operating-system memory or UEFI library restrictions. It can run from legacy or UEFI BIOS, through Linux boot protocols, or from a FAT32 USB flash drive, CD-ROM, or PXE network boot. For PXE, the project documents different binaries for BIOS and UEFI boot as iPXE or PXELINUX payloads. Testing continues indefinitely, with the pass counter advancing after all selected tests finish. The software is licensed under GNU GPL version 2, with no additional restrictions on private or commercial use. Stable and nightly binaries are available, though nightly builds are generated automatically and are untested and unsupported. Secure Boot must be temporarily disabled because the binary is not signed by Microsoft. USB drivers remain in progress, and not all USB devices are supported.

Piston is an Android app that turns a phone into a scanner for vehicle diagnostics. It works with OBD-II and EOBD vehicles through a separate ELM327 adapter connected by Bluetooth or WiFi. The free plan costs nothing and includes reading and clearing diagnostic trouble codes, viewing Freeze Frame data, and reading real-time sensor data. Access is limited to information the vehicle provides through OBD2. Premium adds sensor charts, CSV export, Readiness Monitors, fault history, cloud sync, and VIN reading. Some older vehicles may not support VIN readout. Piston uses Firebase services for crash reporting, monitoring, analytics, authentication, remote configuration, and cloud storage. Settings provide opt-outs for several data services, and account deletion permanently removes associated data.