Fairlee Focus vs Modern RPN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fairlee Focus
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Wondering how to quickly and easily find out what's going on around Fairlee Town, VT? Look no further than Fairlee Focus!
Modern RPN
A minimalist reverse Polish notation calculator for iOS devices. It offers Standard, Binary, and Hex modes for quick calculations and programmer-friendly conversions, featuring a clean interface and a 4-level stack.
- Reverse Polish Notation (RPN) input
- Standard, Binary, and Hex modes
- 4-level visible stack
- Calculation history
- Saved session state
- Clean dark interface
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Modern RPN is a minimalist reverse polish notation calculator for iPhone and iPad, with Standard, Binary, and Hex modes for fast everyday math and programmer-friendly conversions. Use a clean 4-level stack, instant mode switching, calculation history, and saved session state to move quickly without clutter. Features: • True RPN input with ENTER to push or duplicate values • Standard, Binary, Financial, and Hex calculator modes • Mode-aware entry and display formatting • 4-level visible stack: T, Z, Y, X • Core operations: add, subtract, multiply, divide • Stack tools: POP, X/Y swap, sign toggle, backspace, and all clear • Calculation history with timestamps • History filtering by All, Standard, Binary, Financial, or Hex • Saved session state for your current mode, stack, and in-progress input • Clean dark interface designed for focus and readability • No accounts, no ads, no data collection Modern RPN is designed for people who want the speed of a classic RPN calculator with a modern iOS interface.
Screenshots
Verdict
The clearest difference is price: Fairlee Focus at Free against Modern RPN's $2.99. Fairlee Focus also leads on iOS requirement (15.0 vs 26.2). Modern RPN's advantage is update cadence (every 5 days vs every 3 months). On ads, in-app purchases 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
Fairlee Focus is free to download; Modern RPN costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Fairlee Focus ships an update every 3 months, Modern RPN every 5 days. The most recent releases landed on November 4, 2026 and November 6, 2026 respectively.
| Parameter | Fairlee Focus | Modern RPN |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 132 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | GOGov, Inc. | Kevin Flathers |
In-app purchases
Fairlee Focus
No in-app purchases
Modern RPN
No in-app purchases
