DifCal vs Daily Essay
Price, ratings, monetisation and update history for both apps, side by side — 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.
Daily Essay
This app provides a daily writing prompt to inspire creativity and improve writing skills. It serves as a personal coach for those looking to become better writers, expand their knowledge, or stay informed.
- Daily writing prompts
- Writing skill improvement
- Creativity spark
- Knowledge expansion
- Inspiration source
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Ready to level up your writing game? Daily Essay is your personal writing coach, delivering a fresh prompt every day to spark your creativity. Whether you're aiming to become a wordsmith, expand your knowledge, or just stay in the loop, this app is your daily dose of inspiration. So, what are you waiting for? Download now and start your writing adventure today!
Screenshots
Verdict
The clearest difference is price: DifCal at Free against Daily Essay's $9.99. DifCal also leads on ads (none vs shown) and iOS requirement (12.0 vs 17.6). Daily Essay's advantage is update cadence (every 9 days vs every 15 months). On 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
DifCal is free to download; Daily Essay costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
DifCal ships an update every 15 months, Daily Essay every 9 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | DifCal | Daily Essay |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 15 months | Every 9 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 9 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Sean Brennan | Esther Ramos |
In-app purchases
DifCal
No in-app purchases
Daily Essay
No in-app purchases
Questions
Is DifCal free?
Is Daily Essay free?
Do DifCal or Daily Essay have ads?
Which is updated more often, DifCal or Daily Essay?
Other comparisons
