Build Faster.Ship Smarter.
Cloud-native SaaS products and developer tools that eliminate friction.
Who We Are
One Loop Ahead
Zero Loop Labs is a London-based software company building cloud-native SaaS products and developer tools. We believe the best software removes friction — getting out of the way so developers can focus on what matters.
Our products are API-first, meticulously documented, and designed to scale from side projects to enterprise workloads without missing a beat.
London, UK
Headquarters
SaaS Products
Focus
Developer-First
Philosophy
Our Products
Tools That Work For You
Purpose-built SaaS products designed to eliminate complexity from your development workflow.
PDFforge
A powerful API for generating, transforming, and managing PDFs at scale. Built for developers who need reliable document generation without the complexity.
SealTrail
Tamper-proof audit trails for developers. Add cryptographically verifiable logging to your app in 5 minutes with SHA-256 hash chains.
getpeppr
Peppol invoices in 5 lines of code. Send JSON, we handle UBL 2.1 compliance and Peppol delivery. TypeScript-native, multi-country, zero XML.
FinConvert
Convert bank statements between any format. MT940, CAMT.053, OFX, CSV, JSON — spec-compliant, privacy-first, sub-second conversions via a simple REST API.
Why Zero Loop Labs
Built for Developers
Every decision we make starts with the developer experience. Here's what sets us apart.
API-First Design
Every product starts with the API. Clean, RESTful endpoints with comprehensive documentation and SDKs for every major language.
Cloud-Native
Built on modern cloud infrastructure for automatic scaling, high availability, and global edge delivery.
Developer Experience
Intuitive APIs, detailed error messages, interactive docs, and CLI tools. We obsess over the developer journey.
Enterprise Ready
SOC 2 compliant, SSO integration, role-based access control, and dedicated support for teams that need it.
Open by Default
We share our roadmap, our thinking, and our pricing openly. Trust is built through transparency, not marketing.
UK-Based, Global Reach
Headquartered in London with infrastructure deployed across multiple regions for low-latency access worldwide.
Our Values
What We Stand For
Three principles that shape every product we build and every decision we make.
Ship, Don't Tinker
We build to deliver value, not to chase perfection in isolation. Every line of code exists to solve a real problem for real developers. If it doesn't ship, it doesn't count.
Developer Empathy
We're developers building for developers. Every API, every error message, every doc page is crafted by people who feel the pain of bad tooling — and refuse to inflict it on others.
Radical Transparency
No hidden fees, no mystery roadmaps, no corporate speak. We share our thinking openly — from pricing to architecture decisions — because trust is earned, not demanded.
Ready to Build?
No credit card required · Free tier available