back2book vs Water Flash
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
back2book
Create a printable backup of your iPhone contacts. Easily generate a wallet-sized paper phone book from your stored numbers. Perfect for ensuring you always have important contacts accessible, even without your device.
- Paper backup of phone numbers
- Create wallet-sized phone book
- Simple and fast process
- Uses normal printer
- Backup all stored contacts
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This app lets you paper backup the phone numbers stored in your iPhone or iPad. If you ever lost your mobile or ran out of battery in front of a friends new house whose name is not written on the bell yet, you might have started writing little notes with important numbers and keep them in your wallet. Back2book lets you create a complete backup of your contacts β a wallet sized paper phone book. It takes less then five minutes and is really simple. All you need is a normal printer, scissors and a stapler.
Water Flash
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WaveFlush: Test Your Speakers and Microphone with Precision WaveFlush is your all-in-one audio utility, designed to keep your device sounding sharp. Key Features with WaveFlush: β’ Speaker Test β Use WaveFlush to play a wide range of sound frequencies and check the clarity and balance of your speakers. β’ Microphone Check β Quickly verify if your microphone is working correctly with WaveFlushβs built-in testing tool. β’ Sound Level Meter β Measure decibels in your environment and monitor noise levels using WaveFlushβs accurate dB meter. WaveFlush Premium Upgrade: β’ Unlimited Frequency Testing β Explore the full spectrum of tones without limits. β’ Unlimited Noise Meter β Track sound levels endlessly with WaveFlush Premium. WaveFlush is simple, effective, and designed to help you keep your audio at its best. Auto-Renewable Subscription Terms Will be applied to your iTunes account when purchase is confirmed. Subscriptions will automatically renew unless canceled within 24 hours before the end of the current period. You can cancel at any time in your iTunes account settings. If you purchase a subscription, any unused portion of the free trial period will be forfeited. Cancellation will take effect the day after the last day of the current subscription period and you will be downgraded to free service.
Screenshots
Verdict
The clearest difference is ads: back2book at none against Water Flash's shown. back2book also leads on device support (3 vs 1) and iOS requirement (14.0 vs 16.6). Water Flash's advantage is update cadence (every 3 weeks vs every 8 months). On price and in-app purchases there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. back2book sells 1 one-off in-app purchase and Water Flash sells 2 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.
back2book ships an update every 8 months, Water Flash every 3 weeks. The most recent releases landed on October 7, 2026 and October 1, 2026 respectively.
| Parameter | back2book | Water Flash |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 57.1% of reviews | β |
| Update frequency | Every 8 months | Every 3 weeks β better |
| Ads | No β better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | β |
| Devices | iPhone, iPad, iPod β better | iPhone |
| Requires iOS | 14.0 β better | 16.6 |
| Further details β not scored | ||
| Size | 3 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | TinkaTinka | Elena Anghel |
In-app purchases
back2book
- Full Version$0.99
Water Flash
- Weekly Subscription3 Days trial$4.997 Days
- Yearly Subscription$24.991 Year
Questions
Is back2book free?
Is Water Flash free?
Do back2book or Water Flash have ads?
Which is updated more often, back2book or Water Flash?
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