moddable VS nesper

Compare moddable vs nesper and see what are their differences.


Tools for developers to create truly open IoT products using standard JavaScript on low cost microcontrollers. (by Moddable-OpenSource)


Program the ESP32 with Nim! Wrappers around ESP-IDF API's. (by elcritch)
Our great sponsors
  • Zigi - Workflow assistant built for devs & their teams
  • SonarLint - Clean code begins in your IDE with SonarLint
  • Scout APM - Truly a developer’s best friend
  • InfluxDB - Build time-series-based applications quickly and at scale.
moddable nesper
10 6
1,031 130
2.3% -
9.8 0.0
6 days ago 5 months ago
- Apache License 2.0
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.


Posts with mentions or reviews of moddable. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-06-21.


Posts with mentions or reviews of nesper. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2022-11-22.
  • Introduction to Embedded Systems Programming (Ada)
    3 projects | | 22 Nov 2022
    Checkout Nim! I've used it to great effect for embedded programming. It has memory management system based on non-atomic reference counting (arc) so its fast and deterministic. It has optional cycle collection too (orc). Its easy to mixin manual memory as well.

    I used F# a bit and learned a lot from it, and the same with Elixir. Nim is procedural it has an "enlightened procedural" take that feels like functional programming in some ways. Partly thats due to the very powerful type system - for example Nim lets you define custom distinct (not aliased) number types just like F#. Nim also inherits a fair bit from Pascal and so shares points with Ada like ints with custom ranges. Theres some rough points, but largely its made me enjoy programming again.

    The esp32 is a good route since they're easy to setup. I wrote a wrapper for esp-idf which is used in production in at least two embedded shops:

    You can run it on Arduinos as well. Theres a pure Nim setup called Ratel and a rp2040 wrapper too. :)

  • Ask HN: Who is using C++ as the main language for new project?
    26 projects | | 12 Aug 2022
    You should checkout Nim! I use it extensively on embedded. Nim is fantastic to program in if you're an experienced C/C++ developer. Its safer and smarter but not not pedantic about it.

    Nim compiles to C or C++ so its easy to use on any embedded platform and compiler suite. Thats still huge for embedded. Rust forces a type-trait centric programming style which makes interfacing hardware/embedded harder as you have to make type heavy HALs everywhere -- hence the lack of rtos & library support despite its relative popularity).

    Its pretty trivial to re-use any C/C++ libraries which gives a big boost to the native ecosystem. I wrapped most of the esp32 idf in a few weeks:

    The new GC (ARC) is basically a built in `shared_ptr` or `Rc`. You can also do stack-based programming too and the compiler enforces a safe memory accesses. The performance is great and can match or beat C/C++ if you do a few hours of tuning. Though its easy kill performance if you're lazy (e.g. parse json into a bunch of heaps objects), but that can have its place.

  • Launching the 2021 Nim Community Survey
    3 projects | | 22 Nov 2021
    I would really like to see more work on improving the use of Nim for programming microcontrollers. I stumbled on to recently and it looks neat, but I had issues getting my code to compile. Improved support for other MCUs like the esp8266 and atmega32u4 would be really cool and useful. It would be nice to have Nim as a higher level alternative to micropython or lua in the embedded world (your only other real alternatives being C/C++ or Rust).

    I also found this

  • Nim Version 1.6 Released
    37 projects | | 19 Oct 2021
    Well no language is perfect, but Nim can be used in almost every domain because of it's compilation targets(C, C++, JS) and it's fast compile times(who needs interpretation when compile times are that fast!):

    * Shell scripting, I still assume most people will just use Bash tho:

    * Frontend: or you could bind to an existing JS library.

    * Backend: For something Flask-like: or something with more defaults

    * Scientific computing: the wonderful SciNim

    * Blockchain: Status has some of the biggest Nim codebases currently in production

    * Gamedev: Also used in production: and due to easy C and C++ interop, you get access to a lot of gamedev libraries!

    * Embedded: this is a domain I know very little about but for example or for fun Nim+embedded stuff!

    Most of the disadvantages come from tooling and lack of $$$ support.

  • Why doesn’t V8 fit on my microcontroller?
    9 projects | | 1 Jun 2021
    Not quite sure if I follow what you're saying. As in Tasmota/Berry do or do not do more than provide I2C/SPI?

    > If one wants to do serious stuff they would use an appropriate RTOS and program it in C.

    It's unfortunate, but still largely appears to be the case. I find C very time consuming to program, so I ported Nim to FreeRTOS [1]. It's _very_ nice being able to go from writing highly optimized ISR functions to high level JSON parsing in one language. Add in defaulting to memory safety but with no pause-the-world GC. I tried Rust but it seems more difficult to integrate into existing world RTOS'es, flashers, Swagger debuggers, etc.

    Though, I've been curious what running a WASM VM would be like? One could integrate any language: C++, C, Nim, Rust, etc. Would be interesting.

    > MongooseOS does more than this if we're talking ESP32, also other devices, Javascript, C, C++, commercial support, cloud based OTA upgrades and integration with AWS, Azure, Google and IBM Watson IoT cloud services.

    MongooseOS does seem interesting, but very targeting a niche market with prebuilt needs? For future RTOS'es I think ZephyrOS [2] has a lot of potential given it's now supported by NXP [3], TI, and others but is independent of any given (cloud) vendors or other IoT companies. Some might not like the CMake based build system, but in my view all the RTOS build systems are terrible in their own special way.


  • uLisp
    18 projects | | 4 May 2021

What are some alternatives?

When comparing moddable and nesper you can also consider the following projects:

quickjs-esp32 - QuickJS port for ESP32

nim-esp8266-sdk - Nim wrapper for the ESP8266 NON-OS SDK

Espruino - The Espruino JavaScript interpreter - Official Repo


ulisp - A version of the Lisp programming language for ATmega-based Arduino boards.

jester - A sinatra-like web framework for Nim.

ulisp-bl602 - A version of the Lisp programming language for RISC-V BL602 Boards

Lua-RTOS-ESP32 - Lua RTOS for ESP32

embedded-hal - A Hardware Abstraction Layer (HAL) for embedded systems

esp8266-quickjs - An attempt on getting QuickJS working on ESP8266 hardware

esp32quickjs - QuickJS JavaScript Engine for ESP32