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

Hevy
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A simple, private physio exercise tracker for logging rehab exercises, marking sessions complete, and tracking progress over time. No account; no cloud; works offline.

Website, pricing, platforms and company facts side by side.
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| Website | diffyn.com | physiotracker.app |
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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.


No description of Diffyn yet.
Physio Tracker is a simple web app for people doing physiotherapy or rehab exercises between appointments. It helps users record their exercises, mark sessions as done, and keep a basic progress history without needing an account. Data stays local in the user’s browser, and the app works offline....
What each product offers, as listed by its team.


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Walkthroughs and reviews on video.
The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
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As answered by people managing Diffyn and PhysioTracker.app.
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.
PhysioTracker.app's answer:
Physio Tracker is built specifically for people doing physio or rehab exercises, rather than general fitness or gym training. It is intentionally simple: users can add their own exercises, mark them as done, and keep a basic progress record without creating an account or sending their data to the cloud.
Diffyn's answer
Diffyn is the platform that specializes on both change management and multi-model analysis.
PhysioTracker.app's answer:
A person should choose Physio Tracker if they want a lightweight, private way to track rehab exercises without the complexity of gym workout apps or professional clinical platforms. It is free, works offline, requires no account, and focuses on consistency between physio appointments.
Diffyn's answer
React, Next.js, POSTGRESQL
PhysioTracker.app's answer:
The primary technologies used for building Physio Tracker are HTML, CSS, JavaScript, local browser storage, and Progressive Web App technology for offline-friendly use.
Diffyn's answer
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
PhysioTracker.app's answer:
The primary audience is people doing physiotherapy, injury rehab, mobility exercises, or prescribed home exercise programmes who want a simple way to remember what they did and track their progress over time.
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.
PhysioTracker.app's answer:
Physio Tracker was created after experiencing how difficult it can be to remember physio exercises, track consistency, and explain progress between appointments. Existing tools often felt too fitness-focused, too clinical, or too complicated, so Physio Tracker was built as a simpler alternative for personal rehab tracking.
PhysioTracker.app's answer:
Physio Tracker is an early-stage product, so it does not currently have major public customers. It is currently aimed at individual physio and rehab users who want a simple personal tracking tool.
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