Squirrelly review
A free, open-source JavaScript engine for reusable templates, async work, and inheritance.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Squirrelly is an open-source JavaScript template engine written in TypeScript, for developers generating dynamic text or HTML from reusable templates. It supports rendering and compilation, with helpers, filters, conditionals, loops, partials, and template inheritance. Templates can run synchronously or be configured for asynchronous helpers and operations. Browser use and JavaScript runtimes are within its stated scope, making it a fit for JavaScript teams that want reusable templates without adopting a paid plan.
Its depth is in composition and execution: teams can combine inherited templates with partials and file includes, customize delimiters, trim whitespace, and use inline JavaScript expressions. Caching and precompilation offer additional ways to handle templates in an application. ExpressJS compatibility gives teams in that ecosystem a documented connection point. These capabilities suit projects where templates are part of a JavaScript application; they are less relevant if the need is a broader content or site-building system.
Squirrelly is distributed as open-source software with a free plan, and the published product details identify no paid tiers to compare. The project documentation identifies Squirrelly v8 as current and notes that v7 remains maintained. The feature set centers on template work, not AI capabilities, and ExpressJS is the listed integration, so teams whose requirements depend on a wider named integration ecosystem may want another fit. Choose Squirrelly for JavaScript-based template rendering, especially when async operations and inheritance matter; look elsewhere if templates are only a small part of a broader platform requirement.
Squirrelly pros and cons
- Where it wins
- Supports synchronous rendering and asynchronous helpers and operations
- Includes inheritance, partials, helpers, filters, conditionals, and loops
- Offers caching, precompilation, custom delimiters, and ExpressJS integration
- Where it doesn't
- Its focus is JavaScript template rendering rather than broader application features
- ExpressJS is the listed integration
- It does not include AI features
Squirrelly fact sheet, pricing and score →
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