Mongoose Web Server

mongoose.ws · checked 8 Oct 2026

#3 · Web Server Software

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How it plugs in

—Public API

NoOpen source

YesFree tier

Signal on Web Server Software6.4#3 of 36

Mongoose is a two-file C/C++ networking library and embedded web server for connecting devices and building browser-based device dashboards.

Pricing

GPLv2 Open SourceGPLv2 terms; commercial products must release source under GPLv2Free
CommercialPermanent, royalty-free; bespoke pricing by project · One product, product family, company-wide, or custom coverage; yearly maintenance and support subscription is optional for some license typesOn request
EvaluationRequest an evaluation license to use with non-GPL software; commercialized projects require a commercial licenseOn request

As mongoose.ws lists them, checked 8 Oct 2026.

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Runs on

Web
Windows
Mac
Linux
iOS
Android

Facts

Website: mongoose.ws
Price: Free tier
Free trial: Not stated
Dashboard tools: Mongoose Wizard lets users visually arrange dashboard controls, define a REST API, select target hardware, and generate an editable project.
Firmware updates: The library includes OTA firmware update workflows, and the maker describes signature verification and automatic rollback on its CRA page.
Founded: 2004
Headquarters: Dublin, Ireland
Integrations: Mongoose can work with existing network stacks such as lwIP, Zephyr, and NetX, or run with its own built-in TCP/IP stack.
Intended users: The maker describes Mongoose for developers building connected products and embedded device interfaces, including dashboards, REST APIs, telemetry, remote control, and software updates.
Licensing limit: Commercial products using GPLv2 must release their source under GPLv2 unless they obtain a commercial license.
Maker: Cesanta Software Ltd says it is headquartered in Dublin, Ireland, and was established in 2013 after Mongoose development began in 2004.
Platform support: The maker lists Linux/UNIX, macOS, Windows, Android, FreeRTOS, and embedded architectures including ESP32, NRF52, STM32, and NXP.
Protocols: It implements event-driven non-blocking APIs for TCP, UDP, HTTP, WebSocket, and MQTT.
Resource footprint: The maker says Mongoose runs on 8-bit MCUs with 6 KB RAM, and its built-in TLS uses about 50 KB flash and a few KB RAM per connection.
Security limits: The maker says Mongoose covers the networking layer for CRA work, while product application logic, hardware interfaces, and other process requirements remain the customer's responsibility.

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