Comparison

Voice Math vs XK0

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

Head to head
About

Voice Math

Features
Read full description

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.

About

XK0

Features
Read full description

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

Voice Math3 screens
XK03 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Voice Math sells 1 one-off in-app purchase. XK0 asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard2 real differences · 4 level
Voice Math versus XK0: the parameters behind the verdict, then further details
ParameterVoice MathXK0
PriceFreeFree
Update frequencyEvery 9 days — betterEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.0 — better
Further details — not scored
Size20 MB27 MB
Age rating4+4+
DeveloperHideaki YasukawaDavy Raitt

In-app purchases

1 purchases

Voice Math

One-time1
  • Master Mode$1.99
None

XK0

No in-app purchases

Questions

Is Voice Math free?
Voice Math is free to download, with in-app purchases available.
Is XK0 free?
XK0 is free to download, with no in-app purchases.
Do Voice Math or XK0 have ads?
Neither Voice Math nor XK0 shows ads.
Which is updated more often, Voice Math or XK0?
Voice Math ships an update every 9 days, and XK0 every 3 months. Most recently, Voice Math was updated on October 25, 2026 and XK0 on October 21, 2026.

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