Crystal (programming language)

Reviewed matches are labeled. Other suggestions come from a shared subcategory, use case, source listing or the same category. Compare features and current plans before choosing.

Product
F# F# is a mature, open source, cross-platform, functional-first programming language.
DevType The AI-powered typing trainer to master real code syntax in 15+ languages.
Ruby on Rails Ruby on Rails is an open source full-stack web application framework for the Ruby programming...
C Program Compiler Online Write, compile and run C programs directly in your browser with no installation or signup required.
RegexPlanet Ruby RegexPlanet offers a free-to-use Regular Expression Test Page to help you check RegEx in Ruby free-of-cost.
Ruby UTCP The scalable, secure alternative to MCP for tool calling
Bespoke Prompting Turn ideas into elite production AI specs architectures
Online C++ Compiler Simple online tools for images, PDFs and everyday files

Selected by category and available use-case details. A topic match does not establish equivalent features.

Product
Format Factory Format Factory is software that allows the user to convert media into various file formats. The software is a product of PC Free Time, a Chinese software development company. Read more about Format Factory.
WebSouls Websouls providing secure web hosting since 2002. Trusted by 53,000+ customers, we offer domains, web hosting, website & mobile app development with SEO.
A2Hosting Need Fast, Reliable Web Hosting? A2 Hosting Is The Leader In Optimized Hosting For Any Need! Try Our Hosting Service Today!
Airform Functional HTML forms for Front-End Developers.
Apache Mesos Apache Mesos abstracts resources away from machines, enabling fault-tolerant and elastic distributed systems to easily be built and run effectively.
HD Studio AI-powered no-code platform to build and launch web apps instantly. Build internal tools, dashboards, and portals in minutes with AI.

Added to this directory in the past 30 days. Dates refer to the directory listing, not the product launch.

Product
SightRadar High-accuracy face recognition API compatible with AWS Rekognition that costs half as much and requires only an endpoint change.
O Openaltfinder I made an AI free version of my directory of open-source alternatives
O Onlang Test UI Hypotheses for Mobile Paywalls
S Scaledthought An OpenAI-compatible API that coding agents sign up for themselves

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Profile
Parzibyte Programador freelance y escritor en https://parzibyte.me/blog Si necesitas un trabajo envíame un mensaje en https://parzibyte.me/#contacto
John Ferguson Smart Works at Wakaleo Consulting
Juntao Qiu I help developers design and build maintainable frontend systems.

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Show
Tech World With Milan Newsletter Newsletter · Dr Milan Milanović
Phil's Industrial Notes Newsletter
DevOpsCube Newsletter Newsletter

Retold founder accounts from startups in the same category, each linked to the original.

Story
Tailwind UI's $2 million was five months of a commercial product, not a URL typo Adam Wathan's August 2020 essay says Tailwind CSS had about 10 million installs and that Tailwind UI, then about five months old, was about to cross $2 million in revenue, figures he stated himself beside a slug that mis
ScreenshotOne took three years to $10k MRR and eight months to $20k Dmytro Krasun says ScreenshotOne reached $10k monthly recurring revenue in September 2024, almost three years after launch, then $20k in June 2025, and that the second number changed how much more money still drove him.
AJ said Carrd was about $1.2M ARR and he spends time on the product, not campaigns AJ told SaaS Club Carrd was about $100k MRR, about $1.2 million ARR, and that with two people he invests time in the builder rather than in finding ways to market it; he did not, in the sources fetched here, state $2M AR
WP Engine passed $100M ARR after Cohen made thirty people say they would pay $49 Jason Cohen says he did not start WP Engine until 30 people said they will pay $49 a month, 20 of them did, and in January 2018 he reported the company had passed $100 million ARR and closed $250 million from Silver Lake

Subcategories in the same part of the directory, with the number of listed products.