S vs Invoice Maker by SPK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
S
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Stealth® Mobile App Retail suite is specifically designed to manage all the Retail operations within a Fashion and Luxury shop.
Invoice Maker by SPK
Create and send professional PDF invoices and estimates quickly and easily. This ad-free, watermark-free app is ideal for small business owners, consultants, and freelancers on the go. Customize templates, track clients, and manage your billing efficiently.
- Create unlimited invoices and estimates
- No ads or watermarks
- Customizable invoice fields
- Client list management
- Multiple sharing options (email, WhatsApp, text)
- Convert estimates to invoices
- Company logo and signature upload
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Invoice Maker+ is the #1 invoice app available today! It is an award-winning business utility app with NO ADS and NO WATERMARKS. It is the ideal on-the-go mobile solution for small business owners, consultants, contractors, and freelancers in all industries! Our easy-to-use generator allows you to create and send professional PDF invoices and estimates to your customers within seconds. Create invoices and estimates wherever you are! You can send an invoice while in the office, home, car, and even while you are still with your customer! Share via email, WhatsApp, text, print, and more! Our professionally designed template is sophisticated, clean, modern, and attractive, and the customization features allow you to add as much level of detail as you’d like! --- Features: * Create and Share UNLIMITED invoices and estimates with NO ADS and NO WATERMARKS * Select your region preference to customize your currency and date format * Preview via PDF while the invoice or estimate is being created * Customize invoice fields including billing date, due date, item name, item description, quantity, rate, item discount, shipping, tax, overall discount, etc. * Create, track, and store your client list * Deliver via customized email, whatsapp, text, messenger, print, and more * Track and organize your invoices and estimates using our filters and labels (“Outstanding”, “Paid”, “Open”, and “Closed”) * Upload a company logo to personalize your invoices and estimates * Include personal signature * Add payment details (bank transfer, check payable, paypal email) * Convert estimates to invoice with the press of a button * Duplicate an existing invoice or estimate with the press of a button (major time-saver for recurring customers!) * Mark an invoice or estimate as “Draft” if still a work in progress * Store and organize your invoices in one place so filing taxes is quick and easy * Automatically add names to your client list from your phone contacts * Add any additional notes you wish, such as payment terms, company policy, a “Thank You” note, etc. --- Privacy Policy: https://www.iubenda.com/privacy-policy/17124454 Terms and Conditions: https://www.iubenda.com/terms-and-conditions/17124454
Screenshots
Verdict
The clearest difference is in-app purchases: S at none against Invoice Maker by SPK's 9. S also leads on iOS requirement (11.0 vs 13.0). Invoice Maker by SPK's advantage is update cadence (weekly vs every 4 months). On price, ads and device support 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 Maker by SPK sells 9 in-app purchases, starting at $4.99 per month. S asks for nothing beyond the download.
S ships an update every 4 months, Invoice Maker by SPK weekly. The most recent releases landed on October 6, 2026 and October 24, 2026 respectively.
| Parameter | S | Invoice Maker by SPK |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.8 (911 ratings) — better |
| Positive reviews | — | 73.3% of reviews |
| Number of ratings | — | 911 — better |
| Update frequency | Every 4 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 24 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Dedagroup Stealth | SPK Studios LLC |
Bugs and requests
S
Not enough reviews yet to summarise bugs or requests.
Invoice Maker by SPK
Reported bugs
2 issues- Invoices not updating correctly
- Inability to unsubscribe from paid features
Requested features
3 requests- Ability to sync data across devices
- Increased character limit for item descriptions
- Improved customer support
In-app purchases
S
No in-app purchases
Invoice Maker by SPK
- My Invoice Generator3 Days trial$4.991 Month
- The Invoice Maker3 Days trial$7.991 Month
- Invoice Maker App3 Days trial$9.991 Month
Show 6 moreShow fewer
- Invoice Maker Pro3 Days trial$9.991 Month
- Smart Invoice Maker3 Days trial$39.991 Year
- Quick Invoice Maker3 Days trial$59.991 Year
- Invoice Maker Professional3 Days trial$69.991 Year
- App Invoice Maker3 Days trial$89.991 Year
- Invoice Maker Plus3 Days trial$89.991 Year
Questions
Is S free?
Is Invoice Maker by SPK free?
Do S or Invoice Maker by SPK have ads?
Which is updated more often, S or Invoice Maker by SPK?
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