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Tighten Pro is a code generator & verifier for Mac App Store receipt validation, codesigning & security.

Getting your Mac OS X App ready for the App Store is simple. Until you start thinking about verifying the store receipt, checking the certificate chain used to sign your application and checking the integrity of the application bundle. Implementing all of the WWDR recommendations for the App Store could take up to a month (that's the voice of experience speaking), even for experienced developers!

Tighten Pro changes all that. With a built-in code generator that reads directly from your codesign-ed app more...

What's New

Version 1.0.11:
  • Secure, inline In-App purchase validation.
  • Sandbox security assessment and entitlements.
  • Gatekeeper/Developer ID certificate support & code generation.
  • MASReceipt inspector shows all receipt data including In-App purchases.
  • New receipt validation code with signing and trust certificate chain verification.
  • Generated code now clean of all deprecated function calls.


OS X 10.6.8 or later

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Tighten Pro User Discussion

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Irradiated-Software Member IconReview+79

I'm a bit embarrassed by my first reply, I just didn't do my background reading before attempting to dive in.

Apple's own Code Signing Guide is required reading before getting started:

Once you get your footing, the app is much easier to use. Still, this is a very complex area and I would like to see more comprehensive documentation in the app. There is a short manual and a nice tutorial, but a lot of knowledge is assumed.

Reply0 replies
Version 1.0.6
@timi Member IconComment+458

$300 and you're going to have THAT for an icon?
Honestly if you're going to charge exorbitant amounts for something you should actually pay an artist for an icon to be proud of.

Reply2 replies
Version 1.0.6

Given the audience of this tool, developers, I'm not sure the icon matters much.

More important is whether the tool is easy to use, produces good results, saves me time, and the developer is responsive to support requests.

So far, things aren't going so well…
1) Emails to the developer are bouncing and there is no other form of contact via the website.
2) I'm not sure of the difference between the three versions of Tighten (Free, Regular, Pro).
3) The app description uses terminology like "security requirements" which I'm not familiar with. These are probably common terms within the sphere of software security, but as a developer who is looking for help in a difficult area like this, I need a stronger list of benefits and reasons why I need this app, not a list of features like "Read PKCS#7 format", which means little to nothing to me.


I have since been able to contact the developer and let him know his emails were bouncing. So far, the developer is very helpful and responsive.

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Current Version (1.x)


Downloads 766
Version Downloads 119
License Commercial
Date 15 Nov 2012
Platform Intel 64 / OS X / Intel 32
Price $299.99