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Extism is the open source, universal plug-in system. Extend all the software everywhere! Powered by WebAssembly.

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Browser-based app to visualize the frequencies of an audio file.

Which is more popular?
Based on our record, Extism seems to be more popular. It has been mentioned 25 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | extism.org | spectrum.surge.sh |
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Spectrum TV Review 2018 | Is Spectrum A Good Cable TV Provider?
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Share your experience with using Extism and Spectrum. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Technically WASI 0.1, but I used it (via Extism[0]) to implement a simple login library[1] that works in Rust, Go, and Node. Would be trivial to add other lanugages supported by Extism. Overall I loved the dev experience. [0]:... - Source: Hacker News / 3 months ago
I tinkered with https://extism.org and basically the use case is that they suggest, namely you can extend software in another programming language but without having to setup a container or VMs on the client. They "just" run the code in... - Source: Hacker News / 3 months ago
Check out https://extism.org, it is built for those kinds of use cases. However I think WASI and components could enhance it. - Source: Hacker News / 3 months ago
Tracking Spectrum since Mar 2021.
When comparing Extism and Spectrum, you can also consider the following products.


Procore is the world's most widely used construction project management software. Easy to use, mobile platform with unlimited user licenses.
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Corecon offers integrated estimating, project management, and job costing for small to medium-sized construction companies.
Compare Corecon to Extism or Spectrum:

Application and Data, Build, Test, Deploy, and JavaScript Compilers
Compare QuickJS to Extism or Spectrum:

Summit Vista end to end short and long term property management
Compare SummitVista.io to Extism or Spectrum: