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We've compiled a list of 4 free and paid alternatives to Squid. The primary competitors include Notability, Noteshelf. In addition to these, users also draw comparisons between Squid and GoodNotes, Penultimate. Also you can look at other similar options here: Office and Productivity Software.


Notability
One Time License

Notability is a note-taking app that lets users create, organize, and annotate digital notes. It supports handwriting, typing, audio recording, and PDF annotation. Designed for students and professionals to enhance productivity and streamline inform…

GoodNotes
One Time License Free Free Trial

Squid is a caching proxy server that improves web performance by storing frequently accessed content. It reduces bandwidth use and speeds up web access for users. Squid supports HTTP, HTTPS, FTP, and more, making it ideal for optimizing network traffic and managing internet access.

Squid Platforms

Android Android

Squid Video and Screenshots

Squid Overview

Squid is a high‑performance caching proxy server designed to accelerate web delivery and optimize bandwidth across HTTP, HTTPS, FTP, and related protocols. It operates as both forward and reverse proxy, using a non‑blocking I/O engine that handles requests efficiently under heavy loads. Core functions include object and DNS caching in RAM and disk, advanced access control lists, request authentication and authorization, content filtering, traffic shaping, and full request logging. Squid supports protocol hierarchies via ICP, HTCP, CARP, and WCCP, enabling scalable cache clustering and multi‑level cache routing. It also manages SSL/TLS through features like bumping, peeking, and splicing, and delivers granular policy enforcement through ACLs and customizable error messages.

The primary advantages of Squid are improved response times, reduced bandwidth usage, and enhanced server scalability. By caching frequently accessed content, it significantly lowers origin server load and accelerates delivery for users, allowing ISPs and enterprises to defer infrastructure upgrades and reduce costs. Its traffic management tools support quality‑of‑service enforcement and load balancing across clusters. The extensive ACL framework enables precise security policies, content filtering, and usage logging, while its support for reverse proxy mode allows web acceleration and IPv4‑IPv6 gateway use cases. Cross‑platform compatibility and active open‑source development ensure that Squid remains a flexible, reliable solution for organizations seeking efficient, secure, and scalable web caching infrastructure.

Squid Features

tick-square Notetaking
tick-square Infinite canvas
tick-square Handwritten Notes
tick-square Export to PDF

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Squid Tags

handwriting sign-documents merge-pdf pdf-reader pdf-editor pdf-markup note-taking vector-graphics

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