Comparison

Safe vs Frequency

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

Head to head
About

Safe

This app automates the creation of electronic records for electrical safety testing. It connects to a specific hardware device via Bluetooth to stream real-time measurements and generate detailed test reports, eliminating the need for manual data entry. The app is suitable for organizations of all sizes, from small businesses to large health systems.

Highlights
  • Automated electronic record creation
  • Real-time results streaming via Bluetooth
  • Integrated barcode scanner for Asset ID
  • Stores up to 1000 electronic records
  • Exportable PDF test reports
  • Stand-alone database functionality
Features
Read full description

*This App is only for use with the ST-1 Safe-T Sim Electrical Safety Analyzer from Pronk Technologies Inc. ST-1 Safe-T Sim must be purchased separately. Safe-T Sim App allows you to automatically create electronic records of all your Electrical Safety Testing data. It replaces the need to hand write safety testing data, whether you are documenting pass / fail for each test or writing down results of each measurement. It is designed to serve not only small organizations that may not have an maintenance management database system, but also larger health systems and ISOs that may have a full-fledged CMMS database system already in place. *Real-time results and automated record storage via Bluetooth* Real-time streaming measurements are displayed directly on your iPhone or iPad during automated testing. In the App, users can scroll to the desired test profile, tap the App Start icon, and the App automatically builds your electronic test report while the Safe-T Sim runs the programmed tests. The finalized test report combines the details you need—e.g., Asset ID via App-integrated bar code scanner, Facility and Technician Name, Safe-T Sim model and Serial Number, as well as automatic time and date stamp of each record. *Stand Alone Database* The App is capable of storing up to 1000 electronic records that can be copied and pasted immediately into an open work order, emailed, attached as PDF file, or sent directly to a printer. Single test records can be moved individually, or hundreds of records can be merged into a single record / file and moved together into any program with a text field. Using split screen on your ipad, single or merged records can be copied and pasted or dragged and dropped directly into any program. Electronic Record Storage includes: • User defined Header information o Title o Facility Name o Technician Name • Asset ID scanned into electronic record via App-integrated bar code scanner • Time and date of testing performed • Which automated test profile was used • AC voltage and DUT peak Current Draw (requires Safe-T Sim Main Software 2.1) • Each individual test performed, by name • Test measured value • Test Limit • Pass / Fail overall and for each individual test performed Copyright © 2018 Pronk Technologies Inc. All rights reserved.

About

Frequency

Generate various sound waves, including sine, square, sawtooth, and triangle, with adjustable frequencies from 1Hz to 22000Hz. Visually observe animated sound waves and control volume. Useful for testing hearing, speakers, instruments, and even cleaning water from speakers.

Highlights
  • Generate sine, square, sawtooth, triangle waves
  • Adjustable frequency (1Hz-22000Hz)
  • Animated sound wave visualization
  • Volume control (0-100%)
  • Note selection
  • Speaker cleaning function
Features
Read full description

Are you producing? Want to sound test your speakers or tune your instruments? Or simply, do you want to generate sounds and listen to the generated sounds in different frequencies? Well, then you need a frequency sound generator to produce sound waves in different frequencies. Introducing Frequency Sound Generator! Frequency: Generator Sound player lets you generate a sine, square, sawtooth or triangle sound wave with a frequency between 1Hz and 22000Hz (Hertz). It produces accurate tone & soundwaves while being simple and easy to use. Additionally, pick from a wide variety of notes by taping the notes icon. No matter if you need to sound test and generate high frequency sounds or low frequency sounds, our frequency tone generator is your #1 best solution. EASY CONTROL Frequency: Sound Generator allows you to easily change the soundwaves from the main menu. Simply tap on the sound wave icon and pick between sine, square, sawtooth or triangle. ANIMATED SOUND WAVE You’ll love the animated sound wave function which visually represents the sound for a given frequency. You can change waveform by clicking on a round button at the left side and get a different sound and animated wave. ADJUST FREQUENCY & VOLUME Adjust the sound generating frequency easily by dragging the yellow dot. Make use of the - & + buttons for added adjusting precision. Additionally, control the volume of the generated sounds from 0-100%. NUMEROUS USES: This sound generating app can be used in multiple use cases: - Test your hearing. A human being is capable of hearing frequencies in the average range of 20Hz-20000Hz. This range is getting smaller by age, so it’s interesting to sound test your hearing capabilities. - Test speakers and headphones for the high end (treble) and low end (bass) tones. - Use this app as an instrument tuner when playing or producing. - Cleaning water from the speaker. Since sound is making small vibrations it can help to shake off unwanted water from your speakers. - Find your tinnitus frequency. NOTE: Since mobile phones are not high-quality audio sources and in-built speakers may vary in quality, sometimes users can hear sounds at very low or high frequencies even beyond the scope of human hearing. That noise is not sound of a given frequency but static or “parasite” noise generated by your mobile device. For the best experience use a pair of good quality headphones.

Screenshots

Safe3 screens
Frequency3 screens

Verdict

The call

The clearest difference is ads: Safe at none against Frequency's shown. Safe also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.7). Frequency's advantage is update cadence (fortnightly vs every 56 months) and ratings volume (1.1K vs 9). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Safe holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Frequency has 1.1K ratings behind it against 9, so its average is the more settled of the two.

UpkeepUpdate frequency

Safe ships an update every 56 months, Frequency fortnightly. The most recent releases landed on October 6, 2026 and October 25, 2026 respectively.

Scorecard6 real differences · 4 level
Safe versus Frequency: the parameters behind the verdict, then further details
ParameterSafeFrequency
PriceFreeFree
Rating5.0 (9 ratings) — better4.7 (1.1K ratings)
Positive reviews—72.7% of reviews
Number of ratings91.1K — better
Update frequencyEvery 56 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size11 MB8 MB
Age rating4+4+
DeveloperPronk Technologies, IncLucija Jaksic

Customer experience

Safe

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Frequency

All ratings338 ratings
Positive93.5%
Neutral3.3%
Negative3.3%
Written reviews66 reviews
Positive72.7%
Neutral4.5%
Negative22.7%

Bugs and requests

Safe

Not enough reviews yet to summarise bugs or requests.

Frequency

Reported bugs

4 issues
  • Slider snaps to certain numbers, skipping decimals
  • Missing specific frequencies (431Hz, 432Hz, 128Hz)
  • Settings/controls off-screen on smaller devices
  • App crashes when switching between applications

Requested features

9 requests
  • Manual text input for precise frequency selection
  • Ad-free paid version option
  • Timer feature for sessions
  • Digital tuning with +/- buttons on main screen
  • Background image customization or frequency healing chart
Show 4 more
  • Decimal frequency support
  • Increased decibel/amplification levels
  • Language localization (Turkish requested)
  • Continuous background play without app switching interruption

In-app purchases

None

Safe

No in-app purchases

None

Frequency

No in-app purchases

Questions

Is Safe free?
Safe is free to download, with no in-app purchases.
Is Frequency free?
Frequency is free to download, with no in-app purchases.
Which has better reviews, Safe or Frequency?
Safe is rated higher. Safe averages 5.0 out of 5 from 9 ratings, while Frequency averages 4.7 from 1.1K ratings.
Do Safe or Frequency have ads?
Frequency shows ads; Safe does not.
Which is updated more often, Safe or Frequency?
Safe ships an update every 56 months, and Frequency fortnightly. Most recently, Safe was updated on October 6, 2026 and Frequency on October 25, 2026.

Other comparisons