
Loopy Loyalty
FaveCard
Fideliya
Stomp Loyalty
Smile.io
FanCircles
Kangaroo Rewards
Boost repeat business with a digital loyalty platform offering 8 customizable card types — from stamp and reward cards to memberships — all saved in Apple & Google Wallet.

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 | perkstar.co.uk | diffyn.com |
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What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
Overall verdict
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The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
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As answered by people managing Perkstar and Diffyn.
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.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
Diffyn's answer:
React, Next.js, POSTGRESQL
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
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.
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External articles and on-site reviews we used to compare the two products.


The area where Perkstar pulls ahead is card-type variety. If you specifically need memberships, multipass programs, or cashback as first-class mechanics, Perkstar has those as native card types today. Fideliya's...
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Create digital stamp cards for Apple Wallet and Google Pay. No tech knowledge or app development required.
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Digital loyalty cards that live in Apple & Google Wallet. No app for customers to download. Set up in 5 minutes. Free 30-day trial.
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Loyalty passes that live in Apple Wallet and Google Wallet. No app to download for customers. Supports stamp cards, points programs, gift cards, referrals, and analytics, built for any business that values repeat customers. 14 days free Pro trial.
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Stomp Loyalty is a digital punch card loyalty program software for small to medium businesses.
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Mobile push notifications using wallet passes with loyalty that let brands, creators, and artists build direct relationships with fans using first-party data.
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