OCaml 5.5 Summary: What's New in the Latest OCaml Update
What's new in OCaml's latest 5.5 update? New features, performance improvements, and bug fixes.
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Articles by Isabella Salenius
Explore articles by Isabella Salenius, featuring deep insights into systems programming, distributed computing, and cutting-edge technology. Discover the author's unique perspective and technical expertise that contribute to innovation at Tarides.
What is Functional Programming? A Look at the Programming Style from an OCaml Perspective
Get a comprehensive overview of the definitions, benefits, trade-offs, and use cases of functional programming.
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VSCode Walkthrough: Installing OCaml in 1 Click
We have created a VSCode walkthrough guiding users through installing OCaml with opam.
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Announcing ciao-lwt: A Library for Migrating Lwt to Eio
ciao-lwt: A Library for Migrating Lwt to EioAnnouncing a new collection of tools to automate the migration from Lwt to Eio!
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Announcing New Wasm_of_ocaml Optimisations
Discover the latest optimisations we have brought to Wasm_of_ocaml in 2025!
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OCaml.org Now Uses odoc 3: What’s New?
odoc 3: What’s New?Check out the features that come with the latest version of OCaml's documentation tool odoc!
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Creating ocaml.nvim to Bring Neovim Support to OCaml's LSP Server
ocaml.nvim to Bring Neovim Support to OCaml's LSP ServerIntroducing the `ocaml.nvim` plugin, which integrates OCaml's Neovim editor with the LSP.
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CG
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ICFP 2025: Looking Back at the Biggest Functional Programming Conference of the Year
Check out our summary of everything OCaml at ICFP 2025, including insights from the Tarides engineers who attended!
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Bringing Emacs Support to OCaml's LSP Server with ocaml-eglot
ocaml-eglotDiscover the `ocaml-eglot` project, a plugin that integrates OCaml's Emacs editor support with the LSP.
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Senior Software Engineer
OCaml 5.4 Release: New Features, Fixes, and More!
An overview of the OCaml 5.4 update highlighting new features and bug fixes!
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Ocsigen: A Full OCaml Framework for Websites and Apps
Discover the OCaml web development framework Ocsigen, from its origins to its many helpful features!
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Parsimoni Joins Techstars' Autumn 2025 Programme!
Parsimoni has been selected for Techstars' autumn 2025 space accelerator programme!
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Add Your Own Recipes to the OCaml Cookbook!
The OCaml Cookbook is open to new contributions! This post gives you an overview of the feature and how to add your own recipes.
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Introducing Jane Street's OxCaml Branch!
An overview of Jane Street's OxCaml branch introducing new extensions to OCaml, and how Tarides is supporting the project.
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Improving Memory Profiler Visualisations for OCaml
Discover our Internship project focusing on building new visualisations for OCaml's memory profiler "statmemprof".
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Feature Parity Series: Improving Developer Tooling on macOS
Discover the work that went into improving OCaml debugging for macOS including frame pointers, CFI fixes and CI improvements.
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CEOS Project Kick-Off: Using Satellites to Survey the Earth
Announcing our part in the CEOs project, creating the next generation of satellites for earth observation.
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OCaml Web Development: Essential Tools and Libraries in 2025
Are you curious about using OCaml for web development? We outline some of the biggest tools and libraries you'll want to check out!
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Senior Software Engineer
Feature Parity Series: Restoring the MSVC Port
Discover everything that went into bringing MSVC support to OCaml 5 including C11 atomics, bug reports, winpthreads, and CI updates.
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OCaml in Space: SpaceOS is on a Satellite!
Our sister company Parsimoni sends OCaml into space aboard DPhi Space's Clustergate ride-sharing platform to test the cababilities of SpaceOS.
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We're Moving Ocsigen from Lwt to Eio!
Announcing a new project transitioning the web development framework Ocsigen from Lwt to Eio and effects, creating new tools and workflows.
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Feature Parity Series: Statmemprof Returns!
Statmemprof, a statistical memory profiler for OCaml, is now compatible with OCaml 5! Discover the technical background to the return of the feature.
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The First Wasm_of_ocaml Release is Out!
Discover what's new with the release of Js_of_ocaml 6.0.1 – including Wasm support!
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MirageOS on OCaml 5!
Discover the ongoing work to make MirageOS compatible with OCaml 5 including the Solo5, Unikraft, and improved cross-compilation efforts.
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OCaml 5.3: Features and Fixes!
OCaml 5.3 is released! This post gives you an overview of returning features, optimisations, and fixes as well as a taste for what's to come.
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Learn OCaml the Easy Way - Including the Hard Bits
Discover some of the best resources for learning OCaml, including tutorials, books, and events. Are you a larger group? Learn more about our OCaml courses too!
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Saturn 1.0: Data structures for OCaml Multicore
Announcing the 1.0 release of Saturn, a library of efficient, tested, concurrent data structures ready to use with OCaml 5.
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The New Conference on the Block: What is FUN OCaml?
All the details from the new FUN OCaml conference held in Berlin in 2024, which hosted multiple talks, workshops, and social activities.
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Making OCaml Mainstream: Support Our Open Source Work on GitHub
Tarides contributes to the OCaml community by performing maintenance, hosting community events, and introducing new features to the language. You can now support this work by sponsoring it on GitHub.
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Making Crypto Safer: Introducing the ARGOS Project
We are partnering up to create a custom platform for evaluating, tracing, and detecting suspicious blockchain transactions.
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Looking Back on our Experience at ICFP!
Some of Tarides' engineers share their memories and impressions from the biggest functional programming event of the year.
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Summer of Internships: Projects From the OCaml Compiler Team
We have had the pleasure of hosting several interns in the compiler team this past year. Their projects have tackled varied and challenging tasks touching on different aspects of compiler development, ranging from modularising the observability tool Olly to creating eBPF-based kernel-side performanc…
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Eio From a User's Perspective: An Interview With Simon Grondin
Are you curious about Eio but not sure what to expect? Eio is an effects-based direct-style concurrency library for OCaml 5. I recently spoke with Simon Grondin from Asemio about his personal experience using the I/O library Eio. He was kind enough to share the good and the bad and give me insight i…
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Feature Parity Series: Compaction is Back!
Compaction is a feature that rearranges OCaml values in memory to free up space, which can then be returned to the operating system. In the OCaml 5.2 release, the technique returns to the OCaml Garbage Collector for the first time since its removal in the 5.0 multicore update. This is part one of ou…
Getting Specific: Announcing the Gospel and Ortac Projects
Part of the benefit of open-source development is the opportunity to collaborate on projects across traditional organisational boundaries, such as academia and industry. Tarides is part of a larger effort to develop a behavioural specification language and associated tooling for OCaml. The project c…
NO
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The Biggest Functional Programming Conference of the Year: What are we Bringing to ICFP?
Feeling fashionable? Milan is calling! ICFP 2024 will be held in the Italian fashion capital from 2-7 September, and there is something there for everyone to enjoy. The ACM SIGPLAN International Conference on Functional Programming is a yearly highlight with various keynotes, tutorials, and tracks t…
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How TSan Makes OCaml Better: Data Races Caught and Fixed
Parallel programming opens up brand-new possibilities. Using multiple cores means that users can benefit from powerful OCaml features (like formal proofs and high security) while enjoying greater performance, enabling them to improve their services or projects. However, introducing such a significan…
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FB
Senior Software Engineer
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Monoculture of Insecurity: How CrowdStrike's Outage Exposes the Risks of Unchecked Complexity in Cybersecurity
A seismic event in the IT world, everyone is talking about the CrowdStrike update that caused global chaos earlier this month. There are many great articles and blog posts dissecting the event and suggesting ways to avoid a repeat. Rather than join our voice to the chorus and explain how a small cha…
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Deep Dive: Optimising Multicore OCaml for Windows
We love hosting internships. It is rewarding to potentially facilitate someone’s first foray into the OCaml ecosystem, helping them establish a hopefully life-long foothold in the world of open-source programming. It is also a great opportunity to get new perspectives on existing issues. Fresh eye…
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Introducing Olly: Providing Observability Tools for OCaml 5
It might be tempting to think that we can write code that works perfectly the first time around, but in reality optimisation and troubleshooting forms a big part of programming. However, there are more and less productive (and frustrating!) ways of problem solving. Having the right tools to guide yo…
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Keeping Up With the Compiler: How we Help Maintain the OCaml Language
Not all of our projects have a definite end: a grand culmination of effort and time where we pop champagne and set off fireworks (which is, of course, how we celebrate most of the time). Indeed, providing ongoing support for the OCaml ecosystem is one of our biggest priorities, and it means that we …
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Secure From the Ground Up: Introducing the FIDES Project Combining RISC-V and MirageOS
We entrust some of our most sensitive information to an invisible stream of information flowing back and forth across the globe. Cybersecurity concerns everyone, and Tarides is developing secure, lasting, and high-performing solutions for a diverse set of users. This post introduces you to cutting-e…
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Launching the First-Class Windows Project
We want to make learning and using OCaml easier for more people. Realising this goal involves expanding OCaml support to where the users are and making their experience smooth and hassle-free. It is generally accepted that the current state of OCaml on Windows is not comparable to other popular plat…
Senior Software Engineer
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The OCaml 5.2 Release: Features and Fixes!
There has been a new release of OCaml! The 5.2 release brings several new features, along with improvements, optimisations, and bug fixes. New features include compaction, ThreadSanitizer, and restored support for compiling to the POWER architeture on OCaml, plus other crucial changes that prepare t…
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We Host Our First OCaml Retreat in India!
Hacking retreats are great ways for programmers to connect, explore new ideas, and learn from each other. One of the most popular OCaml retreats is the much-loved Mirage retreat, organised annually in Morocco. But for us OCaml enthusiasts located elsewhere, the journey can be challenging (not to men…
Senior Software Engineer
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Multicore Testing Tools: DSCheck Pt 2
Welcome to part two! If you haven't already, check out part one, where we introduce DSCheck and share one of its uses in a naive counter implementation. This post will give you a behind-the-scenes look at how DSCheck works its magic, including the theory behind it and how to write a test for our nai…
Senior Software Engineer
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NetHSM: Bringing Open Source to the World of Hardware Security Modules
Nitrokey is one of the world’s foremost open-source hardware security companies. They develop IT security hardware for data encryption, decryption, and signing, including key and user authentication. After eight years of development, they recently released the first fully open-source Hardware Secu…
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Principal Software Engineer
Eio 1.0 Release: Introducing a new Effects-Based I/O Library for OCaml
The OCaml 5 update brought much-anticipated support for programming on multiple cores. It also introduced support for concurrency via effect handlers – one of the first mainstream languages to do so. This significant update has had profound performance and UX implications, propelling OCaml into ne…
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Principal Software Engineer
Advisor
Multicore Testing Tools: DSCheck Pt 1
Reaping the plentiful benefits of parallel programming requires the careful management of the intricacies that come with it. Tarides played a significant part in making OCaml Multicore a reality, and we have continued to work on supporting tools that make parallel programming in OCaml as seamless as…
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