RPNu vs Frames Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPNu
Read full descriptionHide full description
RPNu is a calculator that makes crunching numbers easier than it’s algebraic equivalent. RPN stand for Reverse Polish Notation (The ‘u’ stands for universal, meaning it runs on both the iPad and iPhone.) and is the numeric evaluation method used for this app. RPN, I feel, is far superior to the algebraic method and once learned you will never want to use the algebraic again. This calculator has all the normal mathematical function, but also contains a host of other functions that you may find very useful. Space is limited in this description but here are the highlights: Help: There is extensive help to aid the user in determining how to use this app. It is also context sensitive. Programable: You can write your own programs and there are many tools to aid you in doing this. Graphics: You can graph equations and there are several modes to cover almost all requirements. A universal converter that you will find very useful. Matrix arithmetic (determinate, invert, add, subtract and multiply). Date calculator and an hours calculator with moon phase display. Elements and periodic table information. Combinations and permutations calculator Equation integration and root finder. Amortization with many useful functions. Mapping function that allows you to determine distance between points and other functions. Hyperbolic functions. Hexadecimal, Octal, and Binary modes. Barometer function showing QNE and QNH. A compass that not only shows magnetic and true north, but also shows the address you are at. This app includes extensive support for a Bluetooth keyboard. Also, extensive support is given to export your calculations to either email or the universal clipboard.
Frames Pro
Enhance your photos with a collection of classical, high-quality picture frames. Choose from multiple 12-megapixel resolution options to give your images a refined look.
- Classical high-quality frames
- Multiple 12-megapixel resolution options
- Easy selection of frames
- Refined photo enhancement
Read full descriptionHide full description
Frames Pro — Add beautiful classical frames to your photos instantly. Transform your ordinary photos into elegant works of art with high-quality classical frames. Whether it's a family portrait, vacation snapshot, or special occasion photo, the perfect frame makes all the difference. **Features** • Classical frames — dozens of beautifully designed classical patterns • High-resolution frames — optimized for photos up to 12MP • Easy one-tap selection — browse and apply frames instantly • Real-time preview — see how your photo looks with each frame • Save and share — export framed photos to your camera roll • Clean, ad-free experience Whether you're creating photo albums, decorating your social media posts, or making memories last, Frames Pro gives your photos the elegant touch they deserve.
Screenshots
Verdict
The clearest difference is price: RPNu at Free against Frames Pro's $1.99. RPNu also leads on update cadence (every 2 months vs every 27 months). Frames Pro's advantage is chart position (#188 vs unranked). On ads, in-app purchases, device support and iOS requirement 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
RPNu is free to download; Frames Pro costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RPNu ships an update every 2 months, Frames Pro every 27 months. The most recent releases landed on November 11, 2026 and November 6, 2026 respectively.
| Parameter | RPNu | Frames Pro |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | — | 3.7 (6 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 6 — better |
| Update frequency | Every 2 months — better | Every 27 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Best chart rank | — | #188 — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 49 MB | 124 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott Johnson | CHI HAO CHIU |
In-app purchases
RPNu
No in-app purchases
Frames Pro
No in-app purchases









