Comparison

BOLLbox vs Water Eject

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

Head to head
About

BOLLbox

Features
Read full description

Quick and simple visualization of filter operating data, change of filter settings and interaction with the filter. - Visualization of historical filter operating data - Changing control settings - Triggering of flushing - Triggering of power flushing - Visualization of error messages - Contact and support - Sending operating data - Update control box software

About

Water Eject

This app offers tools to clean your iPhone speakers, test audio output, and generate various sound signals. It provides approximate sound level readings and custom tone presets. Advanced features and unlimited use require a premium subscription.

Highlights
  • Speaker cleaning tones
  • Audio test sweeps
  • Sound signal generator
  • Approximate dB meter
  • Custom tone presets
Features
Read full description

Hertzly is a speaker cleaner and audio toolkit for iPhone. Play cleaning tones, check speakers, generate test signals, and measure approximate sound level — all on this device. WHAT YOU CAN DO • Clear — play a high-frequency cleaning cycle intended to help shake moisture or debris from speaker grills. Results vary. It does not repair hardware and does not guarantee water or dust removal. • Speaker Test — play a test sweep and see an on-device frequency-response estimate. For personal reference only, not a lab measurement. • Generator — sine, sweep, square, triangle, sawtooth, white/pink noise, and burst, with frequency, volume, left/right output, and an optional auto-stop timer. • dB Meter — approximate sound-level readings with the microphone. Informational only, not a calibrated meter, and not for safety, workplace, or legal use. • Presets — built-in test tones plus custom presets saved on this iPhone. TRY EACH TOOL ONCE Each tool includes one complimentary use: one cleaning cycle, one Speaker Test, one Generator playback, one dB Meter session, and one custom preset. After that, that tool requires Hertzly Premium. HERTZLY PREMIUM — IN-APP PURCHASE (OPTIONAL SUBSCRIPTION) Hertzly Premium is not included with the free download. It is an auto-renewable Weekly or Yearly subscription sold separately through Apple. Premium unlocks unlimited use of every tool, extra generator options, custom presets, and background playback. Microphone is used only while Speaker Test or dB Meter is running. Audio stays on this iPhone, is not uploaded, and is not saved as a recording. Hertzly is not a medical device and is not a professional sound-level meter. Start at a low volume. Do not hold the phone against your ear during playback or cleaning. SUBSCRIPTIONS Hertzly Premium is available as an auto-renewable subscription: • Weekly • Yearly Payment is charged to your Apple ID at confirmation of purchase. The subscription renews automatically unless you cancel at least 24 hours before the current period ends. Your account is charged for renewal within 24 hours before the period ends. Manage or cancel in iPhone Settings → Apple ID → Subscriptions. Any unused portion of a free trial, if offered, is forfeited when you buy a subscription. Privacy Policy: https://docs.google.com/document/d/1oPuHmV9-btUV5BU1F0oo4taAOJXrmmTN6gZElZMhaQw/view Terms of Use: https://docs.google.com/document/d/1S3m8jhoJgjlPIN1gfuWs2bpO6XHN_mdIjUAWRFMCrrI/view

Screenshots

BOLLbox3 screens
Water Eject4 screens

Verdict

The call

The clearest difference is in-app purchases: BOLLbox at none against Water Eject's 2. BOLLbox also leads on device support (3 vs 1). Water Eject's advantage is update cadence (weekly vs every 7 months). On price, ads 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. Water Eject sells 2 in-app purchases, starting at $0.99 per 7 days. BOLLbox asks for nothing beyond the download.

UpkeepUpdate frequency

BOLLbox ships an update every 7 months, Water Eject weekly. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.

Scorecard3 real differences · 6 level
BOLLbox versus Water Eject: the parameters behind the verdict, then further details
ParameterBOLLboxWater Eject
PriceFreeFree
Rating—5.0 (8 ratings) — better
Number of ratings—8 — better
Update frequencyEvery 7 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better16.6
Further details — not scored
Size29 MB22 MB
Age rating4+9+
DeveloperBOLL & KIRCH Filterbau GmbHTemurbek Rakhimov

In-app purchases

None

BOLLbox

No in-app purchases

2 purchases

Water Eject

Subscriptions2
  • Hertzly Weekly$0.997 Days
  • Hertzly Yearly$24.991 Year

Questions

Is BOLLbox free?
BOLLbox is free to download, with no in-app purchases.
Is Water Eject free?
Water Eject is free to download, with in-app purchases available.
Do BOLLbox or Water Eject have ads?
Neither BOLLbox nor Water Eject shows ads.
Which is updated more often, BOLLbox or Water Eject?
BOLLbox ships an update every 7 months, and Water Eject weekly. Most recently, BOLLbox was updated on October 10, 2026 and Water Eject on September 30, 2026.

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