DifCal vs DP
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
DifCal
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Calculate diffraction angles for a particular crystal with a defined orientation matrix. New crystals can be added to the database. Energy/wavelength can be changed. Currently knows about 4-circle, Z-Axis and Theta-Theta diffractometers as well as 2-circle, powder and amorphous diffraction modes. Current crystals include silicon, diamond, GaAs, Muscovite (mica), graphite, many 3-5 and 2-6 crystals. There are separate screens for setting the crystal (or creating a new one), defining the orientation matrix, defining the diffractometer mode, and calculating either angles, given h,k,l, or hkl given a set of angles. With the larger screen of the iPad all the controls are visible on a single page.
DP
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Screenshots
Verdict
The clearest difference is update cadence: DP at every 2 months against DifCal's every 15 months. DifCal's advantage is iOS requirement (12.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
DifCal ships an update every 15 months, DP every 2 months. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.
| Parameter | DifCal | DP |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 15 months | Every 2 months โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 9 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Sean Brennan | Davy Raitt |
In-app purchases
DifCal
No in-app purchases
DP
No in-app purchases









