Apple has bought SigScalr, the maker of SigLens, giving it a tool to monitor and debug the processes of large numbers of interrelated applications.
Instead of needing multiple programs ranging from Xcode to Activity Monitor, an application monitoring app like SigLens is one tool that tracks and logs what happens inside several apps, or across many routines within the same one. With apps sometimes being written as very many related single-task ones, application monitors give a picture of the whole process.
SigLens from SigScalr was one such application monitor, and its makers claimed it to be up to 100% more efficient than its rivals, DataDog and Splunk.
Now according to the European Union, Apple has acquired "certain assets of SigScalr, Inc." and the option to "offer employment to and hire certain... employees." While the deal has only now been announced, it was reported to the EU on March 12, 2026.
As part of complying with the EU's Digital Markets Act, firms such as Apple are required to report acquisitions that are large or may be significant to European users. The EU publishes a summary of the report, and never less than four months after it has been notified of the acquisition.
In this case, the company appears to have been small, with its LinkedIn profile saying it had between two and ten employees. According to Founder Kunal Nawale's profile, it began in May 2021.
Detail from a search using SigLens - image credit: SigScalr
Based in Nashua, New Hampshire with offices or partners in California, Montana and India, the company spent three years in stealth development. It then secured $1.76 million through a pre-seed funding round in 2024 and released SigLens as an open-source project on February 20, 2024.
Nawale himself previously spent 2017 to 2021 working for Salesforce in various roles concerning similar ideas. He was first a principal engineer working on big data projects, and then became a software architect focusing on application monitoring and observability.
SigScalr is a single-app company, which means there's no question over what Apple has acquired. But neither company has announced what is to happen next, and SigScalr's website has been taken down.
The company has yet to remove its code from GitHub, although datestamps show it hasn't updated that code since July 2025.
Based on that code and the Internet Archive's copy of the firm's website, SigLens is built to let developers analyze apps in detail. That may now be particularly useful when routines could be written with vibe coding, meaning no developer wrote or documented it.
If SigLens is to become absorbed into Apple's Xcode development system, it follows similar acquisitions such as the June 2026 one of Swift tool Play.