Comparison

back2book vs Water Flash

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

Head to head
About

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.

Highlights
  • Paper backup of phone numbers
  • Create wallet-sized phone book
  • Simple and fast process
  • Uses normal printer
  • Backup all stored contacts
Features
Read full description

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 – 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.

About

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 – Use WaveFlush to play a wide range of sound frequencies and check the clarity and balance of your speakers. β€’ Microphone Check – Quickly verify if your microphone is working correctly with WaveFlush’s built-in testing tool. β€’ Sound Level Meter – Measure decibels in your environment and monitor noise levels using WaveFlush’s accurate dB meter. WaveFlush Premium Upgrade: β€’ Unlimited Frequency Testing – Explore the full spectrum of tones without limits. β€’ Unlimited Noise Meter – 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

back2book2 screens
Water Flash3 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences Β· 4 level
back2book versus Water Flash: the parameters behind the verdict, then further details
Parameterback2bookWater Flash
PriceFreeFree
Positive reviews57.1% of reviewsβ€”
Update frequencyEvery 8 monthsEvery 3 weeks β€” better
AdsNo β€” betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesβ€”
DevicesiPhone, iPad, iPod β€” betteriPhone
Requires iOS14.0 β€” better16.6
Further details β€” not scored
Size3 MB12 MB
Age rating4+4+
DeveloperTinkaTinkaElena Anghel

In-app purchases

1 purchases

back2book

One-time1
  • Full Version$0.99
2 purchases

Water Flash

Subscriptions2
  • Weekly Subscription3 Days trial$4.997 Days
  • Yearly Subscription$24.991 Year

Questions

Is back2book free?
back2book is free to download, with in-app purchases available.
Is Water Flash free?
Water Flash is free to download, with in-app purchases available.
Do back2book or Water Flash have ads?
Water Flash shows ads; back2book does not.
Which is updated more often, back2book or Water Flash?
back2book ships an update every 8 months, and Water Flash every 3 weeks. Most recently, back2book was updated on October 7, 2026 and Water Flash on October 1, 2026.

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