FLEX vs UDB
FLEX
engineering.flipboard.comUDB
undo.ioSide by side
| Figure | FLEX | UDB |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | Yes |
| Open source | — | — |
| Linux | — | Yes |
| iOS | Yes | — |
| Plans published | 1 | 1 |
| Spec score · Debuggers | 8.5 (#4) | 7.6 (#16) |
| Intended users | The maker describes FLEX as a tool for iOS development and debugging. | Undo describes UDB as suited to individual developers and highlights race conditions, deadlocks, memory corruption, segfaults, and stack corruption as debugging use cases. |
| Purpose | FLEX is an in-app debugging and exploration tool for iOS development. | UDB is an interactive time travel debugger for Linux C/C++ that records program execution so developers can replay it and inspect state. |
Plans
In their own words
FLEX
FLEX is a free, open-source debugging and exploration library for iOS applications. It runs inside the app and places a toolbar in a window above it, allowing developers to inspect and change application state without an LLDB or Xcode connection or a remote debugging server. The tool can inspect view hierarchies, find live heap objects, show and modify properties and ivars, and call methods. Its network history covers NSURLConnection and NSURLSession requests with timing, headers, and responses. Developers can browse app bundles and sandboxes, inspect SQLite and Realm databases, and view or edit NSUserDefaults values, including strings, numbers, arrays, and dictionaries. FLEX works in the iOS Simulator and on physical devices, supports Objective-C and Swift, and requires an iOS 9-or-later target. Installation options include CocoaPods, Carthage, Buck, manual Xcode integration, and Swift Package Manager.