Voice Math vs XK0
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Voice Math
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Say the answer out loud — that's the whole drill. “Voice Math” is a voice-answer math drill for elementary school. No pencil, no paper. In quick 10-question time attacks (a minute or two each — five minutes a day is plenty), children practice times tables, addition and subtraction with great rhythm. Free: tables 1–3, addition and subtraction. A one-time Master Mode purchase unlocks tables 4–12 and division. ■ A new way to practice math — by voice Read the problem on screen and just say the answer. The built-in iOS speech recognition listens, and a gentle, forgiving check captures correct answers. If it can't hear clearly, switch instantly to a calculator-style tap pad. Children can answer in English, Spanish, Chinese (Simplified or Traditional), Korean or Japanese. ■ Free • Times tables 1–3 • Addition (including carrying) • Subtraction (including borrowing) • Time attack and best records Plenty for memorizing the times tables and practicing carry/borrow. ■ Master Mode (one-time purchase, no subscription) For families who want more, a single purchase unlocks: • Times tables 4–12 and division • Per-table “Progress” (mastery shown as stars) • Automatic weak-spot detection from mistakes and answer time, and adaptive practice that steers the next questions toward weak spots • Parent report (days played, day streak, accuracy per table, recent trend) • Sibling profiles (separate records per child) Purchasing is only inside the parent PIN gate, so kids can't buy by accident. It's a one-time purchase (not a subscription) and supports Family Sharing. ■ For parents — designed for peace of mind • Zero ads (no banners, no full-screen) • Works offline, even in airplane mode. Learning records stay on this device — the app has no servers or accounts (speech is recognized by the built-in iOS engine) • No sign-up, no analytics or tracking SDKs • The purchase flow is hidden from kids, inside the parent PIN A kind, encouraging tone — a healthy learning experience you can confidently hand to your child. ■ Great for • Grades 2–3 (memorizing/cementing times tables, carry & borrow) • Grade 1 addition and subtraction • Early grade 4 division (Master Mode) Saying it out loud makes it stick. Five minutes a day builds fast, accurate calculation.
XK0
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PASS YOUR COMPTIA LINUX+ (XK0-006) EXAM Master Linux system administration with 500+ practice questions designed to get you certified on your first attempt. 500+ practice questions 5-minute study sessions Track your progress Remove mastered questions Text-to-speech support Dark mode available WHY GET CERTIFIED? Linux+ professionals earn up to $203K annually (Skillsoft 2024). With Linux powering 96% of the world's top servers, cloud infrastructure, and container platforms, CompTIA Linux+ validates the skills employers demand across DevOps, cloud, and sysadmin roles. WHAT YOU'LL MASTER: • Boot process and GRUB2 configuration including kernel parameters and boot targets • Filesystem Hierarchy Standard with /etc, /var, /proc, and tmpfs mount points • Systemd service management including unit files, targets, and journalctl logging • User and group administration with passwd, shadow, sudoers, and PAM modules • SELinux security enforcement with contexts, booleans, and policy troubleshooting • Bash scripting with variables, loops, conditionals, exit codes, and cron scheduling • Python scripting for Linux automation including file handling and subprocess calls • Git version control with branching, merging, rebasing, and remote repositories • Docker and Podman container management including images, volumes, and networking • Kubernetes orchestration with pods, deployments, services, and kubectl operations • Ansible and OpenTofu infrastructure as code for configuration management at scale • Package management across RPM, dpkg, yum, dnf, and apt ecosystems • PXE network booting and kickstart automated provisioning for bare-metal deployments • X11 and Wayland display protocols including remote access and GPU configuration • AI/ML integration for system administration including log analysis and anomaly detection STUDY ANYWHERE: Coffee breaks. Commutes. Lunch hours. Turn dead time into Linux administration expertise. Download now. Pass your exam. Master Linux.
Screenshots
Verdict
The clearest difference is in-app purchases: XK0 at none against Voice Math's 1. Voice Math's advantage is update cadence (every 9 days vs every 3 months). On price, ads, device support and iOS requirement 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
Both are free to download. Voice Math sells 1 one-off in-app purchase. XK0 asks for nothing beyond the download.
Voice Math ships an update every 9 days, XK0 every 3 months. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.
| Parameter | Voice Math | XK0 |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days — better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | Hideaki Yasukawa | Davy Raitt |
In-app purchases
Voice Math
- Master Mode$1.99
XK0
No in-app purchases









