Mockoon
Design and run mock REST APIs locally, with OpenAPI support and no account or remote deployment
Free · Open sourceLatest versionMacWindows
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About Mockoon
Mockoon is a desktop application for designing and running mock APIs on your own machine, with no remote deployment and no account required. A separate command line tool can run the same mocks in headless environments and CI.
It helps developers build and test against predictable responses, status codes and latencies without depending on third-party services. It also makes it easier to simulate edge cases and error scenarios, and to onboard new team members.
Highlights
- Unlimited local mock servers and routes
- Control over HTTP methods and statuses, regex paths, file serving and custom headers
- OpenAPI compatibility
- Logs of all incoming and forwarded requests
- JSON templating and a proxy forwarding mode
- HTTPS support
Description adapted from the project README.
- Version
- 9.9.0
- Updated
- Sep 16, 2026
- Size
- 121 MB to 230 MB
- License
- MIT License
Open source details
- Source code
- Exact source for v9.9.0
- Released
- Sep 16, 2026
- GitHub stars
- 8.4K
- Website
- mockoon.com
Community project. Help and bug reports go to the maintainers on GitHub; AppsXi does not provide support for this app.
License
PermissiveMIT License
Use, change and share it freely, including in closed source apps, as long as the copyright notice stays.
Read the full licenseHow this app was checked
AppsXi checks every version before it is listed.
Mac
Signed by 1kB SARL-S (8443RQQKK6)
Apple Developer ID team 8443RQQKK6
Notarized by Apple
Hardened Runtime on
File matches the hash GitHub published
SHA-256 984a167e9b31e6725f2decabd575189fb4e61f185660b392f8856876e68632f1
No malware found
ClamAV 1.5.4 on Oct 13, 2026
Install and behavior test in a virtual machine: not run yet
Coming soon for all listings.
Updates itself from the maintainer's own feed
electron-updater. AppsXi checks each new version too.
1 technical note
- Electron fuses not hardened: RunAsNode on, EnableNodeOptionsEnvironmentVariable on, EnableNodeCliInspectArguments on, EnableEmbeddedAsarIntegrityValidation off, OnlyLoadAppFromAsar off
Windows
Signed by 1kB SARL-S
Certificate from Microsoft ID Verified CS EOC CA 03,O=Microsoft Corporation,C=US
Signature is timestamped
10 of 15 bundled files are unsigned
File matches the hash GitHub published
SHA-256 d417a9215d3c859f4f322f8838e11bcd08b031bdeb827c466ce6cc783baa2401
No malware found
ClamAV 1.5.4 on Oct 13, 2026
Install and behavior test in a virtual machine: not run yet
Coming soon for all listings.
Updates itself from the maintainer's own feed
electron-updater (github). AppsXi checks each new version too.
2 technical notes
- 10 of 15 bundled executables or libraries are unsigned
- 1 bundled binaries lack ASLR or DEP
Versions
9.9.0checked
Checked Oct 13, 2026 · Mac and Windows
DMG · 230 MB, EXE · 121 MB
Questions about Mockoon
Is Mockoon free?
Yes. Mockoon is free and open source under the MIT License. AppsXi lists the maintainers' official release and does not charge for it.
Is Mockoon safe to download?
AppsXi downloads every version of Mockoon from the maintainers' official GitHub release and checks it before it is listed. For version 9.9.0 (checked Oct 13, 2026), the Mac download is signed by its developer and notarized by Apple, the Windows download is Authenticode signed, each file matches the checksum GitHub publishes for the release, byte for byte and a malware scan found nothing.
Does Mockoon run on Apple silicon Macs?
Yes. Mockoon has a native Apple silicon build, and it runs on Intel Macs too.
What does Mockoon need to run?
Mockoon needs macOS Ventura (13) or later.
Who makes Mockoon?
Mockoon is an open source project by mockoon on GitHub (mockoon/mockoon). Help and bug reports go to its maintainers there.
Reviews
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