CallBell vs Frequency
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CallBell
Experience realistic sound effects with this app, featuring high-quality audio and visuals. Customize your experience with a dress-up function that changes sound effects based on themes. Explore augmented reality features for an enhanced simulation.
- Realistic call bell sound simulation
- High image and sound quality
- Refined 3D design
- Dress-up function with themes
- Augmented Reality support
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Call Bell is an entertaining app that simulates the sound of a real Call Bell. Easy operation - no explanation needed! High image and sound quality with a refined design Realistic high-res image by 3D technology The best selected sound effects Check out all other effects reproduced! Dress-up function (extra) Get new themes by meeting cretain conditions! Watch the sound effect change! Get one and try it on your own. Augmented Reality
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.
- Generate sine, square, sawtooth, triangle waves
- Adjustable frequency (1Hz-22000Hz)
- Animated sound wave visualization
- Volume control (0-100%)
- Note selection
- Speaker cleaning function
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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
Verdict
The clearest difference is rating: Frequency at 4.7 against CallBell's 3.5. Frequency also leads on update cadence (fortnightly vs every 21 months) and ratings volume (340 vs 30). On price, review sentiment, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Frequency holds the better App Store score, 4.7 against 3.5. That said, the two scores are not equally well evidenced: Frequency has 340 ratings behind it against 30, so its average is the more settled of the two. Written reviews complicate that: 78% of CallBell's written reviews are positive against 73% of Frequency's, so the app with the better star average is not the one people write more warmly about.
CallBell ships an update every 21 months, Frequency fortnightly. The most recent releases landed on October 14, 2026 and October 18, 2026 respectively.
| Parameter | CallBell | Frequency |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (30 ratings) | 4.7 (340 ratings) — better |
| Positive reviews | 77.8% of reviews — better | 72.7% of reviews |
| Number of ratings | 30 | 340 — better |
| Update frequency | Every 21 months | Fortnightly — better |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 18 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | whitez | Lucija Jaksic |
Customer experience
CallBell
Frequency
Bugs and requests
CallBell
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
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- Decimal frequency support
- Increased decibel/amplification levels
- Language localization (Turkish requested)
- Continuous background play without app switching interruption
In-app purchases
CallBell
No in-app purchases
Frequency
No in-app purchases
Questions
Is CallBell free?
Is Frequency free?
Which has better reviews, CallBell or Frequency?
Do CallBell or Frequency have ads?
Which is updated more often, CallBell or Frequency?
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