Comparison

DifCal vs CTIA Threat Intelligence Prep

Price, ratings, monetisation and update history for both apps, side by side — 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

CTIA Threat Intelligence Prep

Features
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PASS YOUR CERTIFIED THREAT INTELLIGENCE ANALYST EXAM Master threat intelligence with 500+ exam-focused practice questions that mirror EC-Council's C|TIA certification format. 500+ practice questions 5-minute study sessions Track your progress Remove mastered questions Text-to-speech support Dark mode available WHY GET CERTIFIED? Threat Intelligence Analysts earn up to $203K annually (Skillsoft 2024). EC-Council's C|TIA certification validates your ability to collect, analyze, and operationalize threat intelligence that protects organizations from advanced persistent threats. WHAT YOU'LL MASTER: • OSINT, HUMINT, and SIGINT collection techniques • Intelligence lifecycle's six phases from planning to feedback • Strategic, operational, tactical, and technical intelligence levels • STIX 2.1 and TAXII 2.1 protocols for threat sharing • Cyber Kill Chain's seven phases from reconnaissance to actions • MITRE ATT&CK framework with enterprise tactics and techniques • Diamond Model for intrusion analysis • Hypothesis-driven threat hunting methodologies • Analysis of Competing Hypotheses (ACH) and SACH techniques • TLP 2.0 classification protocols (Clear, Green, Amber, Red) • YARA rules for malware identification and detection • Python scripting for threat intelligence automation • Priority Intelligence Requirements (PIRs) and MoSCoW prioritization • SOC integration and intelligence operationalization • Pyramid of Pain for measuring defensive impact STUDY ANYWHERE: Coffee breaks. Commutes. Lunch hours. Turn dead time into threat intelligence expertise. Download now. Pass your exam. Master threat intelligence.

Screenshots

DifCal4 screens
CTIA Threat Intelligence Prep3 screens

Verdict

The call

The clearest difference is update cadence: CTIA Threat Intelligence Prep at every 4 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 Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· 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, CTIA Threat Intelligence Prep every 4 months. The most recent releases landed on October 10, 2026 and October 19, 2026 respectively.

Scorecard2 real differences Ā· 4 level
DifCal versus CTIA Threat Intelligence Prep: the parameters behind the verdict, then further details
ParameterDifCalCTIA Threat Intelligence Prep
PriceFreeFree
Update frequencyEvery 15 monthsEvery 4 months — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size9 MB26 MB
Age rating4+4+
DeveloperSean BrennanDavy Raitt

In-app purchases

None

DifCal

No in-app purchases

None

CTIA Threat Intelligence Prep

No in-app purchases

Questions

Is DifCal free?
DifCal is free to download, with no in-app purchases.
Is CTIA Threat Intelligence Prep free?
CTIA Threat Intelligence Prep is free to download, with no in-app purchases.
Do DifCal or CTIA Threat Intelligence Prep have ads?
Neither DifCal nor CTIA Threat Intelligence Prep shows ads.
Which is updated more often, DifCal or CTIA Threat Intelligence Prep?
DifCal ships an update every 15 months, and CTIA Threat Intelligence Prep every 4 months. Most recently, DifCal was updated on October 10, 2026 and CTIA Threat Intelligence Prep on October 19, 2026.

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