RCL vs HP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RCL
This app faithfully recreates the TI-57 programmable calculator, offering its full scientific functions and programming capabilities. It includes a user manual, sample programs, and features like turbo speed and alphanumeric display.
- TI-57 recreation
- Scientific functions
- Programming capabilities
- User manual included
- Sample programs
- Turbo speed option
- Alphanumeric display option
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RCL-57 is a complete and faithful recreation of the TI-57, one of the first programmable calculators. RCL-57 implements all the scientific functions and programming capabilities of the TI-57. In addition, it includes: * A complete user manual * Sample programs including Lunar Lander * Optional turbo speed and alphanumeric display * Listings of steps, registers and log * Saving and loading of programs * Sharing and importing of programs
HP
Emulates classic Hewlett Packard RPN scientific calculators from the 1970s. Experience the original HP-35, HP-45, and HP-21 models on your iPhone.
- RPN calculator emulation
- HP-35 model
- HP-45 model
- HP-21 model
- Classic scientific calculator interface
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The classic Hewlett Packard RPN (Reverse Polish Notation) calculators. - HP-35, HP-45. First pocket scientific calculators (1972). - HP-21. 2nd gen of the HP-35 (1975)
Screenshots
Verdict
The clearest difference is update cadence: HP at every 11 days against RCL's every 14 months. RCL's advantage is iOS requirement (15.1 vs 17.2). On price, review sentiment, 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. Neither carries in-app purchases, so what you see is what you pay.
RCL ships an update every 14 months, HP every 11 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.
| Parameter | RCL | HP |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.6 (64 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 64 — better |
| Update frequency | Every 14 months | Every 11 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.1 — better | 17.2 |
| Further details — not scored | ||
| Size | 2 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Paul Novaes | Enrique Haro |
Customer experience
RCL
HP
In-app purchases
RCL
No in-app purchases
HP
No in-app purchases
