Made for accountants. Elevated by AI.

Transform accounting workflows with AI at the heart of it

platform3 helps accounting teams modernise complex compliance workflows with AI they can trust — transparent, auditable, and built around the way accountants actually work.

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Supported by Microsoft for Startups
Backed by industry experts
The challenge

Accounting work today is complex, fragmented and slow

Accounting teams are stretched between regulatory expectations, manual processes, and tools that weren't built for the work they actually do. platform3 was built to change that — bringing AI, traceability and accountant-led design to the workflows where complexity slows teams down most.

Complex accounting workflows

Multi-stage processes spanning preparation, review, validation and submission — each with their own risks.

Manual, repetitive tasks

Hours lost to tagging, reconciling and reformatting work that should be handled by intelligent automation.

Long review cycles

Bottlenecks from layered reviews, version chasing and feedback that lives across emails and chat.

Fragmented tools

Work scattered across spreadsheets, documents and disconnected systems with no single source of truth.

Trust gaps in AI outputs

Generic AI tools rarely show their work — leaving professionals unsure whether to trust the results.

Limited traceability

Difficulty proving how a number, judgement or output was reached when regulators or clients ask.

platform3 makes accounting work less complex, more transparent, and more intuitive — creating space for higher-value opportunities.

Platform

An AI-first platform built for the future of accounting.

platform3 brings together AI, audit-grade traceability and accountant-led design — built up service by service, around the moments where complexity slows teams down.

● Live product

Tagsy — iXBRL, automated.

Tagsy is an AI-powered iXBRL tagging platform that automates the tagging of financial documents for regulatory submission — combining machine learning with structured human review.

Explore Tagsy
  1. 1

    AI Auto-Tagging

    Automatically applies iXBRL tags to uploaded financial documents using machine learning.

  2. 2

    Review & Validate

    Our tool flags where complex judgements are needed by the user.

  3. 3

    Generate Output

    Produce a compliant iXBRL output file ready for submission, with full audit trail.

More services are growing within the platform3 ecosystem — each designed to make accounting workflows more intelligent, transparent, and efficient. Every new service shares the same foundations: AI you can audit, oversight you can trust, and design built around how accounting teams already work.

● Coming soon

platform3 Accounting Agent

An AI agent designed to support accountants across day-to-day accounting workflows.

● Coming soon

Financial Statement Preparation

AI-assisted preparation of financial statements with built-in review and traceability.

● Coming soon

Revenue Recognition

Apply revenue recognition standards consistently with AI guidance and audit-grade oversight.

Principles

How we build, ship and partner.

01

Commitment

We build with clients, not just for them — shaping the platform around how they actually work and staying committed to outcomes long after go-live.

02

Value

We measure everything by whether it saves time, raises quality, or unlocks a smarter way of working — not by how impressive the technology sounds.

03

Trust

Every action in platform3 is fully traceable, so users always know how AI is contributing to their work and can rely on what it produces.

What we stand for

Six values shaping every decision we make.

Trusted by Design

Auditable, traceable outputs built to meet regulatory and assurance standards.

Built for Accountants

Designed around how compliance work is actually performed — by preparers and reviewers.

Transparent by Default

Every action is explainable, reviewable and defensible to clients and regulators.

Reliably Accurate

Guardrails and structured review processes that maintain accuracy at every step.

Continuously Improving

A platform that learns firm-specific workflows and gets smarter over time.

Human in Control

Automation with oversight — professionals make the judgements, we handle the work.

About platform3

Built for accountants, by accountants.

Our mission is to give accountants access to the best AI tools they can trust so that they can deliver the best service to their clients — AI-led, transparent, auditable, and built around the realities of professional accounting work.

platform3 exists because accounting teams deserve better than generic productivity tools dressed up as AI. We're building infrastructure for the profession — accountable, defensible, and shaped by people who have actually closed the books.

  • Supported by Microsoft for Startups — building on enterprise-grade cloud foundations.
  • Backed by industry experts with deep accounting, audit and compliance experience.
  • Designed alongside practising accountants, not handed down from a generic AI lab.

— Team

Simon Arnett

Simon Arnett

Co-founder

Rags Sathanandan

Rags Sathanandan

Co-founder

Security & trust

Built with security and accountability at the core.

This is where security, traceability and professional accountability come together. As we grow, we're developing the controls, processes and compliance foundations expected by accounting teams handling sensitive financial and client data.

A security-first approach, built honestly — with what's in place and what's in progress made clear.

We believe security claims should be honest. Below is where we are today — including the work that's actively in progress as we build out our enterprise readiness.

Talk to our team

  • Data protection principles

    Encryption in transit and at rest, with strict access controls.

  • Traceability & auditability

    Every action is logged, attributed and reviewable.

  • Professional review & oversight

    Human-in-the-loop is structural, not optional.

  • Compliance readiness In progress

    Working towards the frameworks expected by enterprise accounting clients.

  • Security controls & certifications In progress

    Formal certifications under active development as we mature the platform.

Get started

Find out how platform3 can support your accounting team.

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