Privacy-first, offline-ready tools built for everyday life. No accounts, no data collection β just lightweight PWAs that respect your information.
β 100% Free to start Β· β One-time purchase for Premium Β· β 14-day money-back guarantee
Lightweight, privacy-first tools. Start free, unlock premium when you need it.
Your daily nutrition assistant
Track your protein intake effortlessly with smart logging, weekly charts, and personalized goals. Perfect for fitness enthusiasts and health-conscious individuals.
Never miss a discount again
Scan and save discount QR codes from stores. Organize by category, set expiry dates, and keep track of your savings β all stored locally on your device.
Never miss a payment again
Track all your bills and due dates in one calendar. Smart reminders, penalty tracking, and monthly budget overview β all stored locally on your device.
See through fake sales
Track real prices and see through inflated "discounts". Know if a "30% off" is actually a good deal, with price history charts and fake sale detection.
Know when someone picks up your package
Track packages at pickup points (ZΓ‘silkovna, Czech Post, GLS, PPL). Never wonder "did someone take it?" again β with status timeline and push notifications.
AI-generated complaints with legal citations
Enter a problem and get a professional complaint letter with Czech legal citations, ready to print or email. Covers returns, cancellations, fines, service issues, and more.
Built different β with your privacy and experience in mind.
All your data stays on your device. No accounts, no tracking, no cloud β your information is yours alone.
Optimized Progressive Web Apps that load instantly and work smoothly even on older devices.
No internet? No problem. Both apps function perfectly without connectivity β perfect for anywhere, anytime.
Available in Czech, Slovak, and English. Built for the local market with international quality.
Free to start, premium features available via one-time purchase β no subscriptions, no surprises.
Regular improvements and new features based on user feedback. We listen and deliver.
Try our apps today β no account needed, completely free to start.
Transparency and trust β our legal documents.
Last updated: August 14, 2025
Casuyi is committed to protecting your privacy. This Privacy Policy explains how we handle data in our mobile applications.
We do NOT collect, store, or transmit any personal data. All information you enter into our applications is stored exclusively on your device using local IndexedDB storage. Nothing leaves your device.
β’ No accounts are required
β’ No cloud synchronization
β’ No analytics or tracking
β’ No third-party data sharing
When you purchase a Premium subscription via Stripe Payment Links:
β’ Payment information is handled entirely by Stripe (stripe.com)
β’ We do NOT store your credit card or payment details
β’ We receive only an email address to verify your purchase
β’ No payment data is stored on our servers
Our applications do not use cookies. Any cookies used by this landing page are solely for Google Analytics (optional, you may opt-out) and do not track personal information.
Our apps are designed with privacy-by-design principles and comply with:
β’ EU General Data Protection Regulation (GDPR)
β’ Czech Act No. 110/2019 Coll., on personal data protection
β’ EU ePrivacy Directive
Our applications are designed for all ages and do not collect data from children. Parental guidance is recommended for users under 16 years of age.
Since we do not collect or process any personal data, there are no data subject rights to exercise. All your data remains on your device and you have full control over it.
If you have questions about this Privacy Policy, contact us at:
Casuyi
PraΕΎskΓ‘ 45, Brno, Czech Republic
appvantagelabs2@gmail.com
Last updated: August 14, 2025
By downloading, installing, or using any application published by Casuyi (collectively, the "Apps"), you agree to these Terms of Service ("Terms"). If you do not agree to these Terms, do not use the Apps.
Casuyi provides mobile web applications (Progressive Web Apps) for personal use. The Apps are designed to work offline on your device and do not require internet connectivity for core functionality.
Each App includes free features available at no charge. Premium features are available via one-time payment through Stripe Payment Links. The Premium purchase:
β’ Is a one-time payment β not a recurring subscription
β’ Grants lifetime access to Premium features
β’ Is non-refundable once the Premium unlock code has been applied to your account
β’ Applies only to your device and cannot be transferred
All Apps are licensed under the MIT License (see below). The MIT License allows you to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the software. However, the brand name "Casuyi" and the app icons/graphics may not be used without express permission.
THE APPS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY ARISING FROM, OUT OF OR IN CONNECTION WITH THE APPS.
In no event shall Casuyi be liable for any indirect, incidental, special, consequential, or punitive damages, including without limitation, loss of profits, data, use, goodwill, or other intangible losses, resulting from your access to or use of (or inability to access or use) the Apps.
We reserve the right to modify these Terms at any time. We will notify users of material changes via our website. Your continued use of the Apps after such modifications constitutes your acceptance of the updated Terms.
These Terms shall be governed by and construed in accordance with the laws of the Czech Republic. Any disputes arising from these Terms shall be resolved in the courts of the Czech Republic.
Copyright (c) 2025 Casuyi
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
According to Β§ 5 of the Austrian E-Commerce Act (ECG) and EU Media Services Act requirements, as applicable in the Czech Republic and EU:
Casuyi s.r.o.
PraΕΎskΓ‘ 45
621 00 Brno
Czech Republic
Business Registration:
IΔO: [To be registered]
DIΔ: [To be registered]
Contact:
Email: appvantagelabs2@gmail.com
Website: 748779fe.apps-landing-6y1.pages.dev
Content Responsible:
Radek NovΓ‘k
PraΕΎskΓ‘ 45, Brno, Czech Republic
Dispute Resolution:
The European Commission provides an online platform for dispute resolution (ODR platform): https://ec.europa.eu/consumers/odr
We are not willing or obliged to participate in dispute resolution proceedings before a consumer arbitration board.