Tagpad is described as 'Lets you add -- and follow -- hashtags in plain text notes' and is an app. There are four alternatives to Tagpad for a variety of platforms, including Mac, Windows, Linux, iPhone and iPad apps. The best Tagpad alternative is Dendron, which is both free and Open Source. Other great apps like Tagpad are Bear, Allegory and Notebag.
Dendron is an open-source, local-first, markdown-based, note-taking tool built on top of VSCode. It supports all the usual features you would expect like tagging, backlinks, a graph view, split panes, and so forth.
Flexible note-taking and writing tool featuring advanced markdown with in-line images, cross-note links, live preview, hashtags, Focus Mode, plain text storage, iCloud sync, one-tap formatting, smart data recognition, and multiple export formats for portability.
Allegory is a powerful notes app with a beautiful iOS-centric UI. The minimal and focused writing experience, combined with an impressive set of powerful features, makes this the ideal choice for everyone.
Notebag is a fully keyboard-compatible note taking app that links all your knowledge and gets out of your way.
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