FLEX vs rr

FLEX

5.8 #20 in Debuggers

About FLEX

rr

6.2 #11 in Debuggers

About rr
FLEXrr
Free planNoNo
Free trialNoNo
Paid from——
Open sourceNoNo
PlatformsiOSLinux
Free planYes—
Supported languagesObjective-C, SwiftC, C++, Go
Target platformsiOS Simulator, physical iOS devicesLinux
Remote debuggingNo—
Time-travel debugging—Yes

Both are listed in Best Debuggers. On The Geeks Club, rr scores higher on our published basis.