Invoice Manager|SIMPL vs Seikyuu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Invoice Manager|SIMPL
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Invoice Manager | SIMPL – Easy & Fast Invoicing Invoice Manager | SIMPL is your all-in-one invoicing solution for businesses and freelancers. Effortlessly create professional invoices by entering customer details or selecting from your saved customer list. Add items manually or choose from your product list, then generate and share invoices instantly! Key Features: - Quick Invoice Creation – Enter details or select from saved lists. - Product & Customer Management – Save and reuse business data. - Instant PDF Generation & Sharing – Send invoices in seconds. - Upload & Sign Documents – Create digital signatures with ease. - Camera to PDF – Scan and convert documents instantly. - Store Business Details – Save your company logo and info for branding. Stay organized and professional with Invoice Manager | SIMPL – the smart way to manage invoices on the go! Download Invoice Manager | SIMPL today and take control of your invoicing – Fast, Simple & Professional! Subscription Details: Payment will be charged to your iTunes account at confirmation of purchase. Subscriptions will automatically renew unless canceled at least 24 hours before the end of the current period. Manage your subscription anytime through iTunes settings. Privacy Policy: https://sites.google.com/view/wizoinvoice/privacy-policy Terms of Service: https://sites.google.com/view/wizoinvoice/terms-of-service
Seikyuu
This app helps freelancers and small businesses create and send professional invoices quickly. It allows clients to pay instantly via payment links and offers features like payment plans, expense tracking, and real-time revenue insights.
- Instant payment links via Stripe
- Customizable invoice templates
- Client payment plans
- Expense tracking with receipt photos
- Real-time revenue dashboard
- Cloud sync across devices
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Seikyuu — Smart Invoicing, Get Paid Faster Run your business from your pocket with Seikyuu, the elegant invoicing app for freelancers and small business owners. PERFECT FOR: • Freelancers & consultants • Small business owners • Creative professionals • Service providers CORE FEATURES: GET PAID INSTANTLY • Send invoices with Stripe payment links • Clients pay with one click • Automatic payment tracking • Accept payments globally INVOICING MADE EASY • Create professional invoices in seconds • Track payment status in real-time • Customizable templates with your branding • PDF generation and email integration • Multi-currency support CLIENT FINANCING • Offer payment plans to clients • Split invoices into installments • Track payment schedule CLIENT & EXPENSE MANAGEMENT • Store client information and history • Snap photos of receipts • Categorize and track spending • Export for tax time INVENTORY & DASHBOARD • Manage products and services • Real-time revenue tracking • Cash flow insights and analytics • Visual charts and reports SMART FEATURES • Biometric security (Face ID/Touch ID) • Dark mode support • Cloud sync across devices • Data export (CSV, Excel) PRICING PLANS: FREE PLAN • 1 client, 1 invoice/month, 1 expense/month • Perfect for testing PRO PLAN - $19.00/month or $190.00/year • Unlimited clients, invoices, expenses • Stripe payment links • Client financing • Advanced analytics • PDF generation & email • Save $38/year with annual plan BUSINESS PLAN - $49.00/month or $490.00/year • Everything in Pro • Multi-user access (coming soon) • Advanced reporting & API access (coming soon) • Custom branding • Save $98/year with annual plan Subscriptions auto-renew unless cancelled. Cancel anytime in account settings or App Store. SECURITY & PRIVACY: • Bank-level encryption (Stripe certified) • Your data stays yours • GDPR & PCI DSS compliant • No ads, ever UNIVERSAL APP: One purchase works on iPhone, iPad, and Mac. WHY SEIKYUU? Unlike bloated accounting software, Seikyuu is designed for speed and simplicity. Create invoices in seconds, send payment links between meetings, get paid on the go. GET STARTED: 1. Download Seikyuu 2. Create your account 3. Add your first client 4. Send invoice with payment link 5. Get paid Download now and start for free. Stripe integration allows credit card payments worldwide. Free Stripe account needed (stripe.com). SUPPORT & LEGAL: Privacy Policy: https://www.seikyuu.com/privacy Terms of Service: https://www.seikyuu.com/terms Support: info@creativitech.co By downloading, you agree to our Terms of Service and Privacy Policy.
Screenshots
Verdict
The clearest difference is update cadence: Seikyuu at daily against Invoice Manager|SIMPL's every 3 days. Seikyuu also leads on device support (4 vs 2) and iOS requirement (13.0 vs 15.1). On price, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Invoice Manager|SIMPL sells 2 in-app purchases, starting at $1.95 per 7 days and Seikyuu sells 4 in-app purchases, starting at $19.00 per month. Whichever you choose, the download price is not the number that matters.
Invoice Manager|SIMPL ships an update every 3 days, Seikyuu daily. The most recent releases landed on October 28, 2026 and October 21, 2026 respectively.
| Parameter | Invoice Manager|SIMPL | Seikyuu |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 days | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 15.1 | 13.0 — better |
| Further details — not scored | ||
| Size | 27 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | ELVIS HOFMARKS | Carlos Ramirez |
In-app purchases
Invoice Manager|SIMPL
- Auto Renewable Subscription3 Days trial$1.957 Days
- Auto Renewable Subscription3 Days trial$5.951 Month
Seikyuu
- Seikyuu Pro Month$19.001 Month
- Seikyuu Business Month$49.001 Month
- Seikyuu Pro Year$190.001 Year
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- Seikyuu Business Year$490.001 Year









