Comparison

Z vs PoolKeep

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

Head to head
About

Z

Generate audio frequencies for personal wellness and experimental use. Explore over 1300 sequences for frequency-based practices on your mobile device. This app is for wellness exploration and is not a medical device.

Highlights
  • Rife frequency generator
  • Over 1300 sequences
  • Audio frequency generation
  • Wellness exploration
  • Mobile and tablet use
Read full description

Z-App is a rife frequency generator designed to generate audio frequencies for wellness. With over 1300 sequences, it allows users to explore frequency-based wellness practices right on their phone or tablet. Disclaimer: Z-App is intended for personal wellness and experimental use only. It is not intended to diagnose, treat, cure, or prevent any medical condition. The frequency lists provided are based on anecdotal and alternative wellness traditions and are not supported by medical evidence. Always consult a healthcare professional before using the app, especially if you have any health concerns. This app should not be used as a substitute for professional medical advice or treatment. Use of the app is at your own discretion.

About

PoolKeep

Features
Read full description

Stop guessing how much chlorine, acid, or baking soda your pool actually needs. PoolKeep turns your test strip readings into an exact treatment plan — the specific chemical, the exact amount for your pool's size, and the order to add it in, so you're never second-guessing a dose again. WHAT POOLKEEP DOES • Log your test results (pH, chlorine, alkalinity, CYA, hardness, salt) in seconds • Get a health score and a clear "in range / monitor / action needed" read on every parameter • Follow a step-by-step treatment plan with exact chemical amounts sized to your pool • Track trends over time with charts for every parameter, so you catch problems before they're a problem • Scan your test strip with your camera to help read the colors — you always confirm the numbers yourself • Get reminders so testing becomes a habit, not an afterthought • Share your pool's history with a pool pro or family member in one tap WHO IT'S FOR Anyone with a pool — chlorine or saltwater — who's tired of guesswork, conflicting advice, or trips to the pool store just to find out what to add. Whether you're brand new to pool care or you've been doing it for years, PoolKeep gives you a straight answer every time you test. Your pool, dialed in — no guesswork required. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Z4 screens
PoolKeep4 screens

Verdict

The call

The clearest difference is in-app purchases: Z at none against PoolKeep's 4. PoolKeep's advantage is update cadence (weekly vs every 2 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. PoolKeep sells 4 in-app purchases, starting at $4.99 per month. Z asks for nothing beyond the download.

UpkeepUpdate frequency

Z ships an update every 2 months, PoolKeep weekly. The most recent releases landed on October 15, 2026 and September 25, 2026 respectively.

Scorecard2 real differences · 8 level
Z versus PoolKeep: the parameters behind the verdict, then further details
ParameterZPoolKeep
PriceFreeFree
Rating4.8 (433 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings433 — better—
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.015.0 — better
Further details — not scored
Size17 MB9 MB
Age rating17+4+
DeveloperAllt Hitt ehfKelly Reed

Bugs and requests

Z

Reported bugs

5 issues
  • Freezing during session
  • Stopping playback when interrupted
  • Compatibility issues with newer OS
  • Lack of TMJ frequency
  • Unexpected volume adjustments

Requested features

6 requests
  • Sawtooth tone
  • Multiple frequencies
  • Play controls
  • Dark mode
  • Back button
Show 1 more
  • Users manual

PoolKeep

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Z

No in-app purchases

4 purchases

PoolKeep

Subscriptions3
  • Founding Member$4.991 Month
  • Monthly$9.991 Month
  • Annual$99.991 Year
One-time1
  • Founding Member Fee$59.99

Questions

Is Z free?
Z is free to download, with no in-app purchases.
Is PoolKeep free?
PoolKeep is free to download, with in-app purchases available.
Do Z or PoolKeep have ads?
Neither Z nor PoolKeep shows ads.
Which is updated more often, Z or PoolKeep?
Z ships an update every 2 months, and PoolKeep weekly. Most recently, Z was updated on October 15, 2026 and PoolKeep on September 25, 2026.

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