Top Alternatives to Synapse

RocketDock is an application launcher.

Alfred is a productivity application for Mac OS X, which boosts your efficiency with hotkeys, keywords and text expansion.

GNOME Do (often referred to as Do) is a free application launcher for Linux

Listary an advanced search tool that enables you to find anything.

Quicksilver is a fast and free productivity application for the Mac, allowing you to save time and improve your efficiency.

Find and Run Robot (FARR) is a program for keyboard maniacs -- it uses an adaptive "live search" function to rapidly find programs and documents.

RecentX is a launcher for Windows designed to make your computing life joyful.

Executor a multi purpose launcher and windows run replacement.

Wox is a full-featured launcher, access programs and web contents as you type.

Keypirinha is a fast launcher for keyboard ninjas on Windows.

LaunchBar is an application launcher for macOS. It provides access to users applications and files, by entering short abbreviations of the searched items name. It uses an adaptive algorithm that learns a users preferred abbreviations for a particular application.

XLaunchpad is a versatile application addresses to all audiences that creates shortcuts to the most used computer resources.

Enso Launcher is designed to give you instant access to your applications and windows.

ASuite is a free open source application launcher for Windows.Project Details It can be also used for applications in the PortableApps format and is an integral part of the Lupo PenSuite.

SlickRun is a free floating command line utility for Windows. SlickRun gives you almost instant access to any program or website.

Portable Start Menu is a simple and free start menu application that can be installed on USB sticks or local PCs.

Quick Search Box (GQSB) is an application launcher and desktop search tool developed by Google for Mac.

Lacona is a keyboard-driven commands software for Mac.