Free42 vs SnapCal+ BOYK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Free42
This application is a faithful re-implementation of the HP-42S scientific calculator and its associated printer. It offers full functionality without requiring original HP ROM images and is an open-source project.
- HP-42S calculator simulation
- HP-82240 printer simulation
- Open source project
- No HP ROM required
- Complete rewrite
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Free42 is a re-implementation of the HP-42S calculator and the HP-82240 printer. It is a complete rewrite, not using any HP code, and it does not require an HP-42S ROM image. Free42 is an Open Source project. The executables and source code are released under the terms of the GNU General Public License, version 2. All third-party code used in Free42 is either in the public domain, or licensed under terms compatible with GPLv2, or used with the authors' permission.
SnapCal+ BOYK
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SnapCal uses OpenAI's vision transformer to extract event details from photos of flyers, posters, and announcements. Simply snap a photo or select an image from your library, and SnapCal automatically identifies the event name, date, time, location, and recurring patterns. With one-tap integration with Apple Calendar and Google Calendar, you'll never manually type event details again. Perfect for conferences, campus events, and networking - just point, shoot, and add to your calendar in seconds.
Screenshots
Verdict
The clearest difference is update cadence: Free42 at every 9 days against SnapCal+ BOYK's monthly. Free42 also leads on iOS requirement (15.0 vs 18.0). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Free42 ships an update every 9 days, SnapCal+ BOYK monthly. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Free42 | SnapCal+ BOYK |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (287 ratings) — better | — |
| Positive reviews | 94.4% of reviews | — |
| Number of ratings | 287 — better | — |
| Update frequency | Every 9 days — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 9 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Okken | COLTON LYNN KINSTLEY |
Bugs and requests
Free42
Reported bugs
2 issues- Occasional issues with Solver function
- Store and Recall functions not working properly
Requested features
3 requests- Display all registers (X, Y, Z, T, Last X) simultaneously
- Ability to share/transfer programs between devices
- Improved use of screen real estate on larger displays
SnapCal+ BOYK
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Free42
No in-app purchases
SnapCal+ BOYK
No in-app purchases
