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The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.

Website, pricing, platforms and company facts side by side.
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| Website | acuityautoredact.com | diffyn.com |
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| Company | Startup from the United Kingdom · 1 - 9 employees · 2026 | — |
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In their own words, as submitted to SaaSHub.


Acuity AutoRedact, developed by Acuity AI Education Ltd., is a specialized, GDPR-compliant software platform designed to automate the secure removal of personally identifiable information and sensitive data from documents. By replacing time-consuming and error-prone manual redaction with a fast,...
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What each product offers, as listed by its team.


An editorial look at what each product does well and who it suits.


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Overall verdict
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As answered by people managing Acuity AutoRedact and Diffyn.
Acuity AutoRedact's answer
Acuity AutoRedact stands out primarily due to its strict data privacy safeguards. It operates a "Zero AI Model Training" policy, meaning that uploaded client data is never used to train foundational AI models, Large Language Models (LLMs), or computer vision systems. Additionally, it implements a rigid 24-hour data retention policy, ensuring all uploaded and processed files are automatically and permanently deleted from their servers within a day.
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
Acuity AutoRedact's answer
True, Irreversible Redaction: Many basic tools create "false redactions" (essentially just drawing a black box over text), which leaves the underlying metadata and code intact and can lead to hefty ICO (Information Commissioner's Office) fines. Acuity AutoRedact scrubs the underlying code, metadata, and revision histories, ensuring the data is genuinely destroyed.
Massive Cost Reduction: Manual redaction can cost UK businesses a huge amount of time or external expertise per Data Subject Access Request (DSAR). Acuity AutoRedact automates this process, bulk-redacting thousands of pages of unstructured data in minutes.
All-in-One Format Support: Instead of using separate tools, it handles PDFs, Office documents, email archives (PST/MBOX), and even CCTV/video redaction in a single platform.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
Acuity AutoRedact's answer
The platform is powered by AI-driven automation technologies tailored for document processing. This includes:
Optical Character Recognition (OCR) for extracting text from scanned documents and images.
Google Gemini (Enterprise Edition) and advanced pattern-matching to automatically identify Personally Identifiable Information (PII) and Special Category Data in unstructured text.
Computer Vision algorithms for identifying and masking facial imagery and sensitive identifiers in video/CCTV files.
It also features an Enterprise API for seamless integration into existing business workflows and systems.
Diffyn's answer:
React, Next.js, POSTGRESQL
Acuity AutoRedact's answer
The primary audience consists of UK businesses, specifically Data Protection Officers (DPOs), compliance teams, privacy officers, and legal counsel. It is designed for professionals tasked with fulfilling high-volume Data Subject Access Requests (DSARs) while ensuring strict adherence to the UK GDPR and the Data (Use and Access) Act 2025.
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
Acuity AutoRedact's answer
Acuity AutoRedact was built by Andrew Walls, the Founder and CEO of its parent company, Acuity AI Education Ltd. The platform was developed to address a specific, expensive problem in the UK compliance sector: the escalating costs and legal risks of manual DSAR processing. It was created to transition privacy teams from slow, error-prone manual reviews to secure, AI-driven automation without compromising on data privacy.
The vision of Acuity AutoRedact is to ensure that document and CCTV redaction is affordable and accessible to anyone who needs it and not locked behind prohibitively expensive subscriptions.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
Acuity AutoRedact's answer
Acuity AutoRedact's customer base primarily includes UK organisations, legal firms, corporate privacy offices, multi-academy trusts, schools, local authorities, charities, businesses and often any organisation that processes a Data Subject Access Request.
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