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Insomnia · earlier release

Insomnia 12.3.0

The URL Kong published for this release, and the SHA-256 of every file in it, so you can prove the copy you have is that one and not something else wearing the same name.

Released 15 January 2026.

This is not the current release

Insomnia is now on version 13.1.0. An older build stops getting security fixes, so install one only when you have a reason: a plugin that broke, a machine that cannot run the new one, a bug you need to reproduce. If you just want Insomnia, take the current version.

Files in Insomnia 12.3.0

Which one of these you want

The scope label says who the installer writes for. A user build installs into your own profile and needs no administrator rights; a machine build installs for everyone and does. On a work laptop where you cannot elevate, the user build is often the only one that will run at all. Silent install switches are on the same data.

Check the file you have

Windows does this without installing anything. In PowerShell:

Get-FileHash .\Insomnia.Core-12.3.0.exe -Algorithm SHA256

Compare what it prints with the value above. If they match, your copy is byte-for-byte the one Kong published. If they do not, it is a different file, whatever it is called and wherever it came from. Paste a hash into the verifier and it will tell you which release it belongs to.

If PowerShell is blocked by policy on the machine, the same thing works from plain cmd with certutil -hashfile Insomnia.Core-12.3.0.exe SHA256. On macOS or Linux it is shasum -a 256 Insomnia.Core-12.3.0.exe.

If the link no longer works

Publishers retire old releases, and we do not host copies, so a link from an earlier version can stop working without notice. Two ways it fails: an honest 404, or — more confusing — the server answers normally but hands you the current downloads page instead of the file. If what arrives is a few kilobytes of HTML rather than an installer, that is what happened.

The hash on this page stays useful either way. It still identifies Insomnia 12.3.0 wherever you find a copy, which is the whole point of publishing it: you can accept a file from somewhere else and still prove it is the one Kong built.

Releases either side of this one

Every Insomnia release we index · where this data comes from