Cryptarithms vs Terminal Drill
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cryptarithms
Solve challenging mathematical puzzles where letters represent digits in arithmetic equations. This app offers 90 cryptarithms with translations into six languages, requiring only basic math and logical reasoning skills.
- Letter-to-digit substitution puzzles
- Logical reasoning challenges
- Arithmetic equality solving
- 90 unique cryptarithms
- Translations into 6 languages
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The ability to sum numbers and perform logical reasoning are the only skills required for solving cryptarithms. Nevertheless, these puzzles are often witty and challenging to solve. A cryptarithm is a mathematical puzzle where digits in an arithmetic equality are replaced by letters. It is defined so that distinct letters correspond to distinct digits. Moreover, when the letters are converted back by the original digits, the resulting equality must be valid. The problem is to find the original digits. 90 сryptarithms with their translations to 6 languages are presented. Enjoy!
Terminal Drill
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Build the command-line skills experts rely on. Move from looking up commands to understanding what to do, why it works and how to check the result. Terminal Drill turns Linux, shell and developer skills into focused practice you can keep coming back to, from your first command to challenging administration workflows. LEARN. RECALL. APPLY. Read a clear lesson, recall the command, then apply what you have learned in a simulated task. Start with guidance and hints, build independence, and revisit skills through spaced review. Today's Workout helps you turn practice into a habit with sessions that fit your day. BUILD A TOOLKIT THAT GOES DEEPER Explore Linux, Shell and Git subjects, with learning routes for Terminal Foundations, Developer Workflows and Linux Operations. Practise files and permissions, text processing, Bash scripts, Git recovery, services, networking and storage. Containers, Kubernetes and Ansible add Preview learning routes and bounded practice simulations. THINK THROUGH THE PROBLEM Work with simulated terminals and files, investigate faults, edit configuration and verify the represented result. Saved lab checkpoints let you return to an investigation. Search the command reference for flags, examples and common pitfalls when you need a second look. KEEP WHAT YOU LEARN Type commands from memory, fill gaps, repair broken commands and interpret output. Review mistakes and target the areas that need attention. Flashcard Study Preview offers subject, learning-track and certification decks, saved study positions and review bookmarks. Cards awaiting review are labelled in the app; study stays separate from scored practice. CHOOSE YOUR WAY TO PRACTISE Move between Today, Learn, Practice, Reference and Progress. Choose a learning focus in Learn, set guidance and format for your workout, and return to saved work. Classic tools and optional Adventure remain available; your learning progress and Full Access purchase are preserved. START FREE. GO FURTHER WITH FULL ACCESS. Try the free introductory content. A one-time Full Access in-app purchase unlocks every current and future track, including future content updates. Existing Full Access owners keep their access. No subscription. Restore purchases on supported devices using the same Apple Account. OFFLINE, ON YOUR TERMS Learn on iPhone, iPad and Mac with bundled content. No account, ads or app analytics. Progress is stored on your device, with manual backup and restore for transfer. Purchases and restoration use Apple's StoreKit. Certification routes are independent study companions with their coverage and gaps shown in the app. Preview content and practical simulations have stated limits and await independent technical review. They supplement hands-on work on real systems; completion does not guarantee certification or exam readiness. Terminal Drill is not affiliated with or endorsed by Red Hat, the Linux Professional Institute or the Cloud Native Computing Foundation. Red Hat, RHEL and RHCSA are trademarks of Red Hat, Inc. Build the habit. Understand the system. Grow your expertise.
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Verdict
The clearest difference is price: Terminal Drill at Free against Cryptarithms's $1.99. Terminal Drill also leads on update cadence (monthly vs every 41 months). Cryptarithms's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 17.0). On ads 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
Terminal Drill is free to download; Cryptarithms costs $1.99 up front. Terminal Drill sells 1 one-off in-app purchase. Cryptarithms asks for nothing beyond the download.
Cryptarithms ships an update every 41 months, Terminal Drill monthly. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.
| Parameter | Cryptarithms | Terminal Drill |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 41 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 7 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Roman Koksharov | Richard Ziolkowski |
In-app purchases
Cryptarithms
No in-app purchases
Terminal Drill
- Terminal Drill - Full Access$3.99
Questions
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