Comparison

Zombie Sudoku vs Voice Shadow

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

Head to head
About

Zombie Sudoku

A unique twist on the classic Sudoku puzzle, this game replaces numbers with zombies. It challenges players to use visual thinking and logic to solve puzzles, offering multiple difficulty levels and hints.

Highlights
  • Zombie-themed Sudoku puzzles
  • Visual thinking challenges
  • Multiple difficulty levels
  • Hint system available
  • Timed gameplay
  • Single-player competition
Features
Read full description

Play Sudoku for free. But instead of numbers, use the undead. In Sudoku, numbers are arbitrary—there's no adding, subtracting, etc. So why not flex some logographical muscles. And why not zombies. There are nine zombies: one for each number in a typical 9x9 Sudoku game. The challenge is to step away from numerical logic and exercise visual thinking. There are four levels of difficultly, hints are available, and numbers can be activated. But the only score is time, and the only competition is you.

About

Voice Shadow

Features
Read full description

【Voice Shadow:Not just a vocal training tool, but your personal voice aesthetics coach】 "If you can't see the shape of your voice, how can you sculpt it with precision?" Breaking the dilemma of blind vocal practice, Voice Shadow seamlessly blends cutting-edge acoustic analysis from professional recording studios with breathtaking cinematic anime aesthetics. Whether you are a singer striving for perfection, a speaker focused on expression, or a beginner passionate about vocal arts, we have prepared a visualized journey of vocal evolution just for you. Why Voice Shadow accelerates your progress: [Pioneering] All-New 3D Acoustic Manifold (PRO) We've brought 3D acoustic dimensionality reduction algorithms—once confined to labs—right into your pocket. Now, you can appreciate millisecond-level slices of your voice from four perspectives: Orbit, Front, Top, and Flow. Vocal Breakdowns: In the 3D manifold, the shift and breakthrough points of resonance are clearly visible. Intuitively sense the trajectory of chest-to-head voice transitions, rather than relying on abstract muscle memory. [Visualizing Details] Dynamic Waveforms & Breathtaking Particle Spectrograms Let every breath of your voice bloom beautifully on the screen. The high-precision real-time dynamic waveforms, coupled with the dancing Hz (Pitch) and dB (Loudness), accurately feedback your breath support and vocal energy. Is your output steady, or are there subtle fluctuations? You'll know at a glance. [Precise Review] Exclusive "Shadow Playback" System A correction experience you'll actually enjoy. Visual Chasing: Let the trajectory of your original voice gently embrace the golden standard reference line, finding perfect pitch in the intertwining of seeing and hearing. Zoom & Scrub: Simply pinch to magnify the waveform. Pause and rewind at will to easily capture every flaw in your runs and vibratos. [Professional Empowerment] 12 Master-Level Acoustic Metrics Enjoy the peace of mind brought by a million-dollar acoustic analyzer anytime. Capture the secret codes deep within your voice: Is your tone clear and bright? Check HNR (Harmonics-to-Noise Ratio) and Formants. Is your phonation steady and relaxed? Measure Jitter (Frequency Instability) and Shimmer (Amplitude Instability). [Immersive Experience] Gamified Vocal Dojo Turn basic training into a profound flow experience. 5 scenario-based training modules accompany you step by step: Swan: Tranquil waters. Cultivate pure sustained tones and calm control. Tiger: Majestic momentum. Awaken deep core support and explosive power. Dragon: Flowing clouds and water. Master the ultimate legato of breath movement. Eagle: Soaring the skies. Develop precise muscle memory and a sense of pitch. Phoenix: Rebirth from ashes. Safely and confidently expand your broad vocal range. This is your precious voice. It deserves to be seen clearly. Download Voice Shadow now and embark on your exclusive journey of vocal transformation. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Zombie Sudoku4 screens
Voice Shadow4 screens

Verdict

The call

The clearest difference is in-app purchases: Zombie Sudoku at none against Voice Shadow's 3. Voice Shadow's advantage is update cadence (every 2 weeks vs every 5 months) and iOS requirement (13.0 vs 16.6). On price, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Voice Shadow sells 3 in-app purchases, starting at $3.99 per month. Zombie Sudoku asks for nothing beyond the download.

UpkeepUpdate frequency

Zombie Sudoku ships an update every 5 months, Voice Shadow every 2 weeks. The most recent releases landed on October 21, 2026 and October 2, 2026 respectively.

Scorecard3 real differences · 7 level
Zombie Sudoku versus Voice Shadow: the parameters behind the verdict, then further details
ParameterZombie SudokuVoice Shadow
PriceFreeFree
Rating5.0 (2 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.613.0 — better
Further details — not scored
Size14 MB98 MB
Age rating9+4+
DeveloperJason Baxter召 陈

In-app purchases

None

Zombie Sudoku

No in-app purchases

3 purchases

Voice Shadow

Subscriptions2
  • PRO Monthly$3.991 Month
  • PRO Yearly$29.991 Year
One-time1
  • Lifetime Access$49.99

Questions

Is Zombie Sudoku free?
Zombie Sudoku is free to download, with no in-app purchases.
Is Voice Shadow free?
Voice Shadow is free to download, with in-app purchases available.
Do Zombie Sudoku or Voice Shadow have ads?
Neither Zombie Sudoku nor Voice Shadow shows ads.
Which is updated more often, Zombie Sudoku or Voice Shadow?
Zombie Sudoku ships an update every 5 months, and Voice Shadow every 2 weeks. Most recently, Zombie Sudoku was updated on October 21, 2026 and Voice Shadow on October 2, 2026.

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