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The history of Hex-Rays is closely connected to that of our flagship product, IDA Pro.

In the early 1990’s, DOS was the most popular OS for PCs which were majorly 8086 with occasional 80286 (80386 was still very expensive). Typical PC had at most 1MB of RAM leaving little space for intensive tasks. However, software development industry was growing quickly and there was a need for debugging and diagnostic tools. Aside from debuggers, disassemblers were mostly batch based (non-interactive). The most popular (and expensive) one was Sourcer by V Communications. It had limited interactivity in that it accepted a “definition file” with a list of starting disassembly points, possible function names and segmentation info. After each change to the definition file the disassembly of the whole file had to be redone from scratch which could take a long time on the machines available at the time. Most of the runtime data was kept in memory (at most 640KB in DOS) so it could fail on big files.

There were some debuggers which could be used for disassembly but they did not really offer RE features such as custom names or comments so deep RE was often done in a text editor or by marking up printouts.

IDA (Interactive Disassembler) offered a new paradigm. It could disassemble a file piece by piece, loading only the fragment which the user was looking at, and did not need to load the whole file into memory. Renaming and commenting was done “just in time” instead of redoing the whole disassembly on every change. The database saved all changes so the work could be performed incrementally over time. However, it took time for this approach to be appreciated by the users.

The complete timeline

Late 1990
development starts
(one of the core source files mentions being created on 25-Oct-1990)
IDA 0.1 (The program banner says “May 20” but it seems the actual release happened a day later)

  Length     Date   Time    Name
 --------    ----   ----    ----
    24708  18-02-91 18:55   COMPRESS.EXE
    11451  21-05-91 22:21   COMTYPES.DOC
    76048  21-05-91 22:24   IDA.EXE
    57344  21-05-91 22:23   IDA.INT
     3581  06-05-91 17:36   IDAE.DOC
     3795  06-05-91 16:22   IDAR.DOC
     5976  27-05-91 18:17   README
    25080  18-02-91 19:07   REPAIR.EXE
 --------                   -------
   207983                   8 files

May 22: Windows 3.0 released by Microsoft September 17: Linux release announcement by Linus Torvalds
IDA 1.8 (16/09/93)
  • Turbo Vision instead of custom UI
IDA 2.0
  • IDC scripting language added
  • start of shareware distribution (mainly via FidoNet and BBS, some FTPs)
  • support for additional processors (8080, 8085, Z80)
  • support for the NE file format (16-bit Windows and later OS/2)
“Reverse Compilation Techniques” thesis by Cristina Cifuentes, dcc decompiler
August 15: Windows 95 released
IDA 3.84 (07/03/99)
  • Plugins support added in the SDK
IDA 4.0 (21/09/99)
  • Windows GUI version (text mode listing only). First appearance of now-classic IDA icon.
IDA Pro by Ilfak Guilfanov
IDA 4.10 (19/06/2000)
  • Type System (standard function prototypes)
  • PIT (parameter identification and tracking)
IDA 4.17 (22/03/2001)
  • Graphs and flowcharts using Wingraph
experiments with microcode
April: Boomerang decompiler development starts
June: Desquirr decompiler plug-in released

January: user-contributed Windows PE debugger plugin (Idbg)

IDA 4.5 (12/02/03)
  • Integrated debugger
IDA Win32 debugger
IDA 4.6 (27/10/03)
  • 64-bit address space support; AMD64 disassembly
May: first decompiler results on a real life trojan

IDA 4.7 (30/08/04)
  • support for fragmented (chunked) functions
  • Linux console version
  • remote cross-patform debugging
IDAPython 0.5.0 (07/08/04) released by Gergely Erdelyi

September: IDAPython presented at the Virus Bulletin conference
IDA 4.8 (15/03/05)
  • 64-bit remote debugger
Hex-Rays SA is registered.
Ilfak starts posting on
December 14: WMF vulnerability zero day attack
December 31: Ilfak’s unofficial vulnerability hotfix becomes very popular
IDA 5.0 (03/06)
  • the built-in graph view
IDA 5.1 Hex-Rays decompiler beta testing opens (11/05/07)
Hex-Rays Decompiler 1.0 (17/09/07) released
Hex-Rays Decompiler SDK (25/10/07) released

August 8: opens

January 1: Hex-Rays SA takes over development of IDA

IDA 5.3
  • Multithreaded debugging
  • iPhone, Symbian debuggers
IDAPython 1.0.0 released
  • development moves to Google Code
IDA 5.4
  • Bochs, GDB, WinDbg debuggers
  • IDAPython included with IDA
IDA 5.5
  • dockable windows
  • arrival of the now classsic IDA layout with the functions list to the left of disassembly
IDA 5.6
  • IDAPython support for Linux and Mac
  • 64-bit Linux and Mac debuggers
  • ARM Linux remote debugger
  • Appcall feature
IDA 5.7
  • Scripted plugins and processor modules
  • ARM decompiler
IDA 6.0
  • cross-platform Qt based GUI version for Windows, Linux & Mac
Bug bounty program opens. First submissions and fixes for 6.0 and 5.7
IDA 6.3
  • source-level debugging
IDA 6.4
  • ARM64 disassembly
IDA 6.6
  • x64 decompiler
IDA 6.7
  • Python bindings for the decompiler SDK
IDA 6.9
  • ARM64 decompiler
  • ARM64 Android debugger
IDA 6.95
  • iPhone debugger using official Apple debugserver
  • PPC decompiler
IDA 7.0
  • IDA is a native 64-bit executable for all platforms
IDA 7.1
  • decompiler microcode API opened
IDA 7.2
IDA 7.3
  • PPC64 decompiler
  • UNDO feature
IDA 7.4
  • Python 3 support
IDA 7.5
  • folder views
  • MIPS decompiler
IDA 7.6
  • native ARM64 macOS build