Offline-capable
Built so the app can remain useful even when a constant connection is not available.
Offline-capable invoicing for iPad and iPhone
InvoBaseOS keeps invoicing private, local, and clean.
InvoBaseOS is an Apple-inspired invoicing app for iPad and iPhone, developed by Twin Unified Studios LLC. It is designed for freelancers first, while staying flexible enough for broader business use. The experience focuses on offline capability, encryption-based protection, and a calm interface built for everyday work.
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Status: InvoBaseOS is now available for purchase on the App Store for both iPad and iPhone.
InvoBase for iOS
InvoBaseOS for iPhone and iPad
Encryption-based direction
Shaped around protecting invoice-related business information through a privacy-minded design direction.
Apple-inspired aesthetic
Clean surfaces, calm spacing, and a polished interface designed to feel simple and premium.
Freelancer-first
Tailored for freelancers while still being broad enough for consultants, studios, and other business users.
Core features
Designed to feel calm, focused, and business-ready.
InvoBaseOS is intended to reduce friction, keep invoice work organized, and give users a cleaner business tool built around local control.
Invoice-first workflow
Built around invoicing as the core task, with a focused experience instead of a bloated business dashboard.
Local business control
Designed to feel direct and dependable, with an emphasis on keeping the workflow close to the user.
Clear visual structure
Strong readability, thoughtful spacing, and a premium layout direction inspired by modern Apple UI design.
Freelancer-oriented design
Especially useful for independent professionals who want a more private and lightweight invoicing workflow.
Offline-capable use
Supports a more flexible workflow for users who do not want to rely entirely on cloud access while working.
Everyday business usability
Meant to be simple enough to return to daily without noise, confusion, or unnecessary overhead.
Security and privacy direction
InvoBaseOS is being shaped around privacy-minded business use. The design direction centers on local ownership, encryption-based protection, and minimizing unnecessary reliance on outside systems.
- Privacy-focused direction for handling invoice-related business data
- Local-first structure intended to support stronger user control
- Professional interface without visual clutter or unnecessary complexity
- Offline-first workflow designed to reduce dependency on constant internet access
Pay Once for the Core App
InvoBaseOS is designed around an offline-first workflow, giving businesses a professional invoicing experience without requiring a recurring subscription for core functionality.
- One-time purchase for the core app
- Works offline without requiring constant internet access
- Designed exclusively for iPad and iPhone
- Built for small businesses, freelancers, and independent creators
Cloud services may be offered in the future, but InvoBaseOS is being designed to remain fully functional around local ownership and offline-first workflows.
Screenshots
InvoBaseOS App Showcase
Showcasing the InvoBaseOS features and abilities in the app.
InvoBaseOS for iPad
Login Screen
Dashboard
Secured Re-Authentication
Settings Screen
Designed for iPhone
InvoBaseOS provides the same core invoicing, privacy, and security features on iPhone through an interface adapted for a smaller, touch-focused screen. Data remains stored locally on each device, and iPhone and iPad data do not currently synchronize.
iPhone highlights
- Optimized for smaller screens
- Compact touch-friendly navigation
- Same core invoicing and export tools
- Local on-device data storage
- Independent data between iPhone and iPad
Login Screen
Dashboard
Invoices
Settings
Compatible Devices
InvoBaseOS is designed for supported iPhone and iPad models running the required version of iOS or iPadOS. We recommend your device be running iOS 17.0 or newer.
iPhone
These iPhones have been tested and support InvoBaseOS.
- iPhone SE (2nd Generation)
- iPhone SE (3rd Generation)
- iPhone XS | iPhone XS Max
- iPhone Xr
- iPhone 11 | iPhone 11 Pro Max
- iPhone 12 mini | iPhone 12 | iPhone 12 Pro | iPhone 12 Pro Max
- iPhone 13 mini | iPhone 13 | iPhone 13 Pro | iPhone 13 Pro Max
- iPhone 14 | iPhone 14 Pro | iPhone 14 Pro Max
- iPhone 15 | iPhone 15 Plus | iPhone 15 Pro | iPhone 15 Pro Max
- iPhone 16e | iPhone 16 | iPhone 16 Plus | iPhone 16 Pro | iPhone 16 Pro Max
- iPhone 17e | iPhone 17 | iPhone 17 Pro | iPhone 17 Pro Max
- iPhone Air (1st Gen)
iPad
These iPad models have been tested and support InvoBaseOS.
- iPad (6th Generation)
- iPad (7th Generation)
- iPad (9th Generation)
- iPad (10th Generation)
- iPad (11th Generation)
- iPad Mini (6th, 7th Generation)
- iPad Mini (A17 Pro)
- iPad Air (2nd, 3rd Generation)
- iPad Air (5th Generation | M1 Model)
- iPad Air 11" | 13" M2
- iPad Air 11" | 13" M3
- iPad Air 11" | 13" M4
- iPad Pro 10.5"
- iPad Pro 11" (2nd, 3rd, 4th Generation)
- iPad Pro 12.9" (2nd, 3rd, 4th, 5th, 6th Generation)
- iPad Pro 11" | 13" M4
- iPad Pro 11" | 13' M5
Why it stands apart
A quieter, stricter, more trustworthy way to handle invoicing.
InvoBaseOS is not trying to be everything at once. It is designed to feel focused, controlled, and reassuring, especially for people who care about privacy, accountability, and a smoother day-to-day workflow.
Ownership hierarchy
One true owner. Clear layers below.
InvoBaseOS uses a role-based structure with Primary Admin, Admin, and Standard access. The Primary Admin is the full owner of the system. Admins operate below that level with permissions and re-authentication where needed. Standard users remain view-only for safer oversight.
Privacy first
Security is not an extra. It is the product mindset.
From the way actions are handled to the way records are protected, security and privacy are treated as the first priority — not a late add-on.
Extreme encryption
Protection at every layer.
All actions are intended to remain encrypted for security, with an aggressive protection mindset built around business-sensitive data.
Audit clarity
Every action leaves a trace.
Actions are logged to support accountability, internal review, and confidence in what happened, when it happened, and who performed it.
Tamper detection
Made to notice when something feels wrong.
InvoBaseOS is being shaped with tamper-aware thinking so suspicious or unauthorized changes are harder to ignore.
High-stakes actions
Destructive actions should feel serious.
Multi-step warning verification helps protect against accidental deletion or damaging changes. This is especially important for audit purposes, where a reckless click should never be enough.
Re-authentication
Admins are challenged again when it matters.
Critical workflows can require re-authentication, while the Primary Admin retains full system-level control.
Business identity
Prefix customization built in.
Adjust invoice prefixes to better match your naming structure, client expectations, or internal business style.
Comfortable software
Clean UI. Softer lighting. Less fatigue.
The interface direction is intentionally calm and easy on the eyes, avoiding harsh visual noise so the app feels better during repeated daily use.
What comes later
Cloud sync may arrive if users actually want it.
Future cloud-based sync is being considered based on feedback, but the current direction respects users who want stronger local control first.
Launch direction
Planned to stay accessible.
InvoBaseOS is currently planned around a $9.99 one-time launch price, with the goal of providing a professional offline invoicing experience while keeping the app accessible and easy to adopt.