Dylibso

Dylibso is a company.

Active

Updated: Dec 9, 2025 ·

Recent News & Mentions

Mar 1, 2023FundingDylibso - Seed Nov 1, 2022FundingDylibso - Seed

Financial History

Dylibso has raised $7.0M across 2 funding rounds. Most recently, it raised $5.0M Seed in March 2023.

Total Raised

$7.0M

Valuation

N/A

Funding Rounds Raised

Date	Round	Lead Investors	Other Investors
Mar 1, 2023	$5.0M Seed		A Capital, Boldstart Ventures, Cyberstarts VC, Eight Roads Ventures, Felicis Ventures, Graph Ventures, Liquid 2 Ventures, NFX, SV Angel, TechAviv Founder Partners, Abrahami Avishai, Frederic Kerrest, Immad Akhund, Michael Ma, Ronny Conway, Ryan Carlson
Nov 1, 2022	$2.0M Seed		Boldstart Ventures, TechAviv Founder Partners

Financial History

Dylibso has raised $7.0M across 2 funding rounds.

Total Raised

$7.0M

Valuation

N/A

Leadership Team

Key people at Dylibso.

Amir Rustamzadeh

Investor

Leadership Team

Key people at Dylibso.

Amir Rustamzadeh

Investor

Deep Dive

High-Level Overview

Dylibso is a startup founded in 2022 that builds tools to enable developers to deploy WebAssembly (Wasm) seamlessly in production environments.[1][2][3][4] The company develops Extism, an open-source universal plug-in system powered by Wasm that makes any program extensible by end users, supporting languages like Go, Rust, Ruby, Python, PHP, and expanding to Java, C#, and Zig.[2][4] It also offers Modsurfer, a commercial system of record and diagnostics tool providing visibility into Wasm binaries for debugging, compatibility checks, security scanning, and pipeline integration via CLI/GitHub actions.[2][3][4] Dylibso serves developers and DevOps teams at enterprises adopting Wasm, solving pain points in integrating, debugging, and managing Wasm modules in development, integration, and production—aiming to position Wasm as the go-to compilation target.[1][2][3][4] Backed by $8.2 million in funding (including a $6.6 million seed led by Felicis Ventures), Dylibso maintains offices in Boulder, Los Angeles, and New Orleans.[2][3]

Origin Story

Dylibso was founded in 2022 by experienced developers, including co-founder and CEO Steve Manuel, who previously worked at Cloudflare (where he added Wasm support to Workers) and Rigetti Computing in quantum computing.[2][4] The idea emerged from Manuel's hands-on challenges with Wasm in production, leading to Extism's launch in December 2022 as an open-source framework for easy Wasm integration into non-Wasm codebases.[2][4][5] Early traction came from Extism's adoption in major projects like GitHub, community contributions for new language SDKs, and the general availability of Modsurfer alongside a $6.6 million seed round in March 2023, led by Felicis with Boldstart Ventures, Pebblebed, and Crew Capital.[2][3][4] This funding built on prior investments, totaling $8.2 million, fueling Dylibso's mission to make software "squishy"—extensible and portable via Wasm's isolation and security.[3][5]

Core Differentiators

Extism's Plug-in Simplicity: Open-source system for embedding Wasm plugins into any program (regardless of host language), enabling end-user extensibility with strong isolation, portability, and support for 13+ languages; used in production at scale like GitHub.[2][4][5]
Modsurfer's Visibility Tools: First-of-its-kind "X-ray" for Wasm binaries, offering a searchable database, diagnostics, security scans, compatibility validation, and enterprise upgrades; integrates into CI/CD pipelines for DevOps tracking.[2][3][4]
Developer-First Ecosystem: Focus on production-ready Wasm tooling, community-driven SDKs, and evangelism for "squishy software" that prioritizes ease of integration over custom runtimes.[1][5]
Proven Expertise: Backed by developer-centric VCs like Felicis (with exits like Shopify, Fitbit); led by operators who've shipped Wasm at Cloudflare.[2][3][4]

Role in the Broader Tech Landscape

Dylibso rides the WebAssembly adoption wave, a portable binary format transforming software extensibility beyond browsers into servers, edge computing, and plugins—driven by needs for secure, performant code reuse across languages.[2][4][5] Timing is ideal post-2022, as Wasm matures with ecosystem growth (e.g., GitHub integrations, new SDKs), amid market forces like cloud-native DevOps demanding isolation without silos.[2][5] By open-sourcing Extism and commercializing Modsurfer, Dylibso lowers barriers for enterprises, influencing the ecosystem through community contributions and positioning Wasm as a universal standard over proprietary alternatives.[1][3][5]

Quick Take & Future Outlook

Dylibso is poised to expand its Wasm toolchain with projects like Chicory, deepen enterprise adoption via Modsurfer subscriptions, and grow Extism's community for broader language/host support.[5] Trends like AI-driven extensibility, edge computing, and "squishy" architectures (secure plugins everywhere) will accelerate its trajectory, potentially capturing Wasm's infrastructure layer as adoption hits production scale.[5] Its influence could evolve from tooling pioneer to ecosystem orchestrator, making Wasm the default for extensible software—fulfilling its founding mission to empower developers worldwide.[1][2][5]

Sources

Frequently Asked Questions

How much funding has Dylibso raised?

Dylibso has raised $7.0M in total across 2 funding rounds.

Who are Dylibso's investors?

Dylibso's investors include A Capital, Boldstart Ventures, Cyberstarts VC, Eight Roads Ventures, Felicis Ventures, Graph Ventures, Liquid 2 Ventures, NFX, SV Angel, TechAviv Founder Partners, Abrahami Avishai, Frederic Kerrest.