Comparison

DifCal vs DP

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

DifCal

Features
Read full description

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.

About

DP

Features
Read full description

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Screenshots

DifCal4 screens
DP3 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

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.

Scorecard2 real differences ยท 4 level
DifCal versus DP: the parameters behind the verdict, then further details
ParameterDifCalDP
PriceFreeFree
Update frequencyEvery 15 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 โ€” better15.0
Further details โ€” not scored
Size9 MB26 MB
Age rating4+4+
DeveloperSean BrennanDavy Raitt

In-app purchases

None

DifCal

No in-app purchases

None

DP

No in-app purchases

Questions

Is DifCal free?
DifCal is free to download, with no in-app purchases.
Is DP free?
DP is free to download, with no in-app purchases.
Do DifCal or DP have ads?
Neither DifCal nor DP shows ads.
Which is updated more often, DifCal or DP?
DifCal ships an update every 15 months, and DP every 2 months. Most recently, DifCal was updated on October 29, 2026 and DP on October 28, 2026.

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