NASM
OpenRCT2
Multipass
x64_dbg
VS Code
Notepad++
Micro Python
Open source self-assembling assembler supporting multiple operating systems.
CodeUtil.dev
SamToolkit
Base64Encode.dev
DevsBox
JSONFormatter.org
DevToolKit.site
CodifyFormatter.org
Fast, free developer tools. JSON formatter, Base64, JWT, Regex and more. Runs 100% in your browser.

Which is more popular?
Based on our record, FASM seems to be more popular. It has been mentioned 14 times since March 2021.
Website, pricing, platforms and company facts side by side.
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FAS
FASM
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CT
CodeTray.dev
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| Website | flatassembler.net | codetray.dev |
| Pricing | — | |
| Listed in |
What each product offers, as listed by its team.
Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.
No analysis of FASM yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Code Review: string length in x64 assembly (fasm)
More videos
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How often each product is chosen within a category, 0–100% relative to the other.
Share your experience with using FASM and CodeTray.dev. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.
Did you get a look at fasm [0] ? It has nice capabilities [0] : https://flatassembler.net/. - Source: Hacker News / over 1 year ago
Are you affiliated with https://flatassembler.net/? Source: over 3 years ago
Https://flatassembler.net Unfortunately it won't run on recent Macs since it's written in 32-bit assembly, so some modifications are needed. - Source: Hacker News / almost 4 years ago
Tracking CodeTray.dev since Jun 2026.
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Game engine recreation of RollerCoaster Tycoon 2 adding new features.
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29 free browser-based developer tools — JWT, regex, cron, timestamp converters, CSS generators, security checkers, and content generators. No sign-up required.
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Multipass provides a command line interface to launch, manage and generally fiddle about with instances of Linux.
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