WatchSafe vs NUMEN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WatchSafe
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Take control of what your kids watch on YouTube. Only approved videos. No algorithm surprises. Subscription required for full access. WatchSafe gives parents approval-first control over their child’s YouTube viewing. Instead of open browsing or unpredictable recommendations, children can only watch videos, channels, or playlists that a parent has explicitly approved. No algorithms. No wandering. Just clear boundaries and predictable viewing. --- HOW WATCHSAFE WORKS Parents choose what’s allowed. Kids can only watch from that approved list. WatchSafe uses a patent-pending, approval-first approach that works with YouTube’s official player—adding structure and real parental control around viewing. --- KEY FEATURES • Approval-First Control Approve channels, videos, or playlists before your child can watch. Preview content first so there are no surprises. • Time Management Set daily limits, schedules, and school-time or overnight viewing blocks. • Short-Form Video Controls Choose whether short-form content like Shorts is available for your child. • Monitoring & Reports View watch history, receive alerts, and review daily or weekly usage summaries. • Multiple Child Profiles Create individual child profiles with their own rules, schedules, and approved content. • Learning-Friendly Options Track educational viewing and support learning-focused goals. • Family Safety Designed with child privacy in mind, including PIN protection and secure access controls. --- SUBSCRIPTIONS WatchSafe requires a subscription to unlock full functionality. Plans are available with monthly and annual billing options. Pricing is clearly shown in the app before purchase. No free trial is currently offered. • Control Includes core parental control features for up to [X] children, with individual profiles and settings for each child. • Control+ Includes everything in Control, with support for additional children, advanced insights, and faster setup tools. Subscription options and child limits are clearly shown in the app before purchase. --- BILLING & SUBSCRIPTIONS Payment will be charged to your Apple ID account at confirmation of purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription at any time in your Apple ID account settings. Pricing and billing periods are shown in the app before purchase. --- REFUND POLICY WatchSafe does not offer a free trial. We offer a 7-day money-back guarantee on new subscriptions so you can make sure it’s right for your family. --- IMPORTANT INFORMATION WatchSafe works with YouTube’s official player and does not block or modify advertisements shown by YouTube. Pairing with YouTube Premium may reduce ads. WatchSafe is designed to help parents guide—not replace—their child’s online viewing experience. --- YOUTUBE INTEGRATION WatchSafe connects securely to YouTube’s public API (via OAuth) to let parents search, preview, and approve channels, playlists, and videos. We strictly adhere to YouTube’s Terms of Service—no algorithms, just parent control. YouTube Premium support may reduce ads. Terms of Service: https://watchsafe.app/legal/eula
NUMEN
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"Not solving math — the moment you start to feel it." NUMEN is not a problem-set app. It's an app for everyone who once gave up on math — and wants to recover the sense of it. ■ A different approach Other math apps: Definition → Formula → Practice → Wrong answer NUMEN: Experience → Pattern → Intuition → Definition You touch with your finger. You drag a slider. You watch values change. Each fraction slice, each function curve, each direction of a negative number — every concept comes alive as moving math, not memorized math. ■ Who is this for? · Middle and high school students who lost the thread · People burned out on classroom-style explanations · Adults who want to understand investing, statistics, or AI · Anyone who wants to feel "I wasn't bad at math — the connections were just broken" ■ What's inside · Interactive lessons you actually touch 33 lessons across 10 phases — sense, relations, change, chance, shape, cycles, limit, slope, accumulation, direction · Intuition first, definition later See the phenomenon, find the pattern, then meet the formal name · 5–10 minute daily sessions Light enough to keep, deep enough to transform · Daily streaks A little, every day — that's how sense rebuilds · Four languages Korean · English · Japanese · Simplified Chinese — every lesson body translated · iPhone · iPad universal · Fully offline No ads. No tracking. No data collection. No internet calls. ■ Why NUMEN? You weren't bad at math. Only the connections between concepts were broken. NUMEN was designed — by hand, with care — to reconnect them. "Oh — I wasn't dumb. The connections were just broken." That moment is what NUMEN is built for. ■ Privacy by design NUMEN collects zero personal information. All progress is stored only on your device. No analytics, no advertising SDKs, no external APIs. ■ Pricing · The app itself — free to download · Phase 1–3 (12 lessons, ≈ 60 min of content) — free · Phase 4–10 (21 lessons) — single one-time in-app purchase, unlocks forever. No ads, no subscription, no renewal. ■ Coming next · More lessons within Phase 5–10 · Personal review / notes screen Begin today. Mathematical sense is not memorized — it is recovered.
Screenshots
Verdict
The clearest difference is in-app purchases: NUMEN at none against WatchSafe's 4. On price, update cadence, 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
Both are free to download. WatchSafe sells 4 in-app purchases, starting at $4.99 per month. NUMEN asks for nothing beyond the download.
WatchSafe ships an update every 3 weeks, NUMEN every 5 weeks. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.
| Parameter | WatchSafe | NUMEN |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 56 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Crucible Lab LLC | Byoungho Kim |
In-app purchases
WatchSafe
- WatchSafe Control14 Days trial$4.991 Month
- WatchSafe Control+ Monthly14 Days trial$6.991 Month
- WatchSafe Control Annual14 Days trial$49.991 Year
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- WatchSafe Control+ Annual14 Days trial$69.991 Year
NUMEN
No in-app purchases









