Comtel vs Frequency
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Comtel
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Comtel GSM Remote Control Application has been designed to provide communication and remote control to a CS Siren or a Group of Sirens using GSM network. The application can send SMS, DTMF packets and can also perform Live Audio announcements via phone calls using GSM Network. Features: • Store Siren or Group IDs. • Store up to 16 different warning signals. • Store up to 239 different digital messages. • Live Audio calls (Public Address only by decoding DTMF packets). • Silent test and receive reports via SMS Attention This application requires GSM Siren Remote Controller to be installed to your Siren network.
Frequency
Generate precise audio frequencies for various purposes, from tuning instruments to cleaning water from speakers. Explore different waveforms and customize sound generation for unique audio experiences. Elevate your audio quality and functionality.
- Generate frequencies from 1 Hz to 40,000 Hz
- Clean water/moisture from speakers
- Produce sine, triangle, sawtooth, and square waveforms
- Tune musical instruments
- Select notes and octaves for specific pitches
- Play multiple frequencies simultaneously
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# GENERATE ANY TONE, FROM 1 HZ TO 40 KHZ Frequency is a tone generator. Set a pitch by hertz or by note and octave, choose a waveform, and play it. It also plays the low sweep that pushes water out of a blocked speaker. # PLAY A TONE AT ANY FREQUENCY Enter a value in hertz, or pick a note and an octave and let the app work it out. The range runs from 1 Hz to 40,000 Hz, past the top of human hearing. # CHOOSE YOUR WAVEFORM Sine, triangle, sawtooth, and square. Each has its own character, and switching between them at the same pitch is the quickest way to hear the difference. # PLAY SEVERAL TONES AT ONCE Run more than one tone together, each with its own frequency, waveform, and volume, and listen to how they interact. # CLEAN YOUR SPEAKER Water trapped in a speaker muffles it. Playing a low-frequency tone at full volume vibrates the driver and pushes the water out — the same technique a smartwatch uses to eject water after a swim. # A REFERENCE PITCH TO TUNE AGAINST Play a note at a known frequency and tune your instrument to it by ear. Frequency plays the reference; it does not listen, so nothing you play reaches the app. # TUTORIALS INCLUDED Step-by-step guides for generating tones, working with waveforms, running several at once, and cleaning a speaker. # SUBSCRIPTIONS AND AUTOMATIC RENEWAL - Your subscription includes access to the features listed above. - Payment will be charged to your Apple ID Account at confirmation of purchase. - Subscription automatically renews unless auto-renewal is turned off at least 24 hours before the end of the current period. - Your account will be charged for renewal within 24 hours prior to the end of your selected subscription period. - Subscriptions can be managed and auto-renewal turned off in your App Store Account Settings. # LEGAL Terms of Service: https://cooptimizeit.com/terms-of-service Privacy Policy: https://cooptimizeit.com/privacy-policy # SUPPORT Contact us at info@cooptimizeit.com. We reply within 48 hours.
Screenshots
Verdict
The clearest difference is in-app purchases: Comtel at none against Frequency's 10. Frequency's advantage is update cadence (every 10 days vs every 63 months). On price, ads, device support 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
Both are free to download. Frequency sells 9 in-app purchases, starting at $7.99 per 7 days. Comtel asks for nothing beyond the download.
Comtel ships an update every 63 months, Frequency every 10 days. The most recent releases landed on September 8, 2026 and September 7, 2026 respectively.
| Parameter | Comtel | Frequency |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.9 (24 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 24 — better |
| Update frequency | Every 63 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 36 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | ProgressNet | Optimize IT |
In-app purchases
Comtel
No in-app purchases
Frequency
- Weekly Premium$7.997 Days
- Weekly7 Days trial$9.997 Days
- Weekly VIP3 Days trial$9.997 Days
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- Monthly Premium$17.991 Month
- Monthly7 Days trial$19.991 Month
- Annual VIP$24.991 Year
- Annual Premium$24.991 Year
- Annual VIP3 Days trial2 variants$29.991 Year
- Annual7 Days trial$29.991 Year









