Blue Box vs Frequency Sound Generator App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Blue Box
Encode and decode DTMF signals using your device's microphone or keypad. Play back tone sequences with adjustable settings, and save them for easy recall. Explore various tone systems, including trunk control and coin signals, for educational and utility purposes.
- Encode/decode DTMF signals
- Adjustable tone, delay, and volume
- US, UK, and European tone systems
- Multi-frequency and trunk control tones
- Coin tone sequences (Red Box mode)
- Custom tone creation
- Save and organize sequences
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Blue Box is utility for encoding and decoding DTMF (Dual-Tone Multi-Frequency) or Touch Tone signals. Generate tones by using the phone style keypad or decipher tones using the device’s microphone. Tone combinations can be played back with adjustable tone, delay and pause lengths and volume. Choose from US, UK and Europe based systems. Enable Multi-frequency tones, which were a precursor to DTMF. Additional trunk control signals will be available including KP, ST1, ST2, ST3, KP/ST2. Additional tones include the Dial Tone, Ring Back Tone, Busy Signal and 2600Hz. A comma can be used as a pause character to provide extra time between tones during playback. Save and organize any number of sequences for easy recall using the Favorites feature. Choose numbers from your contacts to display and play back tones. Share an encoded or decoded number with the Phone, FaceTime or Messages app. Use Red Box mode to play coin tone sequences, including 5¢, 10¢ and 25¢ for the US system and 10p and 50p for European systems. Create a custom tone with control over individual frequencies and volumes. The custom tone can consist of any number of on and off pulses and can optionally be continuous. Record interactions with the encoder and play them back with the same timing. The recording feature works with all tones, including the dial tone, busy signal, ring back tone, 2600Hz and coins and trunk control tones. A help manual is including, with step-by-step instructions for all features. When the app is first run, pop-ups will be displayed indicating what the controls are used for. Warning: Blue Box is designed as an educational tool and utility. Do not attempt to use Blue for any illegal or malicious purposes. Blue Box can be used to assist in dialing numbers, but can not be used to manipulate digital telephone utility services. Limitations: Blue Box is software based decoding and is processor intensive. Performance may vary between devices. Tones that are less than 100 ms with pauses that are less than 100 ms are difficult to process in software. Future versions and processors may increase the reliability of faster tone sequences. If you need touch tone decoding for higher speeds, a hardware solution is recommended. Blue Box can not play tones into the iPhone phone feature while in a call. Blue Box is useful for entering numbers into touch tone operated systems such as an answering machine passcode or a dial-up service that requires the entering of several touch tones to navigate a menu system. Simply enter the numbers once and then play back the numbers into the phone's microphone with a touch.
Frequency Sound Generator App
Generate sound frequencies from 1Hz to 25,000Hz with a simple interface. Features include wave visualization, adjustable sensitivity, and multiple waveform options. Use it for hearing tests, pet training, or as a prank tool.
- Frequency range 1Hz to 25,000Hz
- Wave visualization
- Adjustable sensitivity
- Multiple waveforms (Sine, Square, Sawtooth, Triangle)
- Custom frequency range
- Logarithmic and Linear slider modes
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Frequency Sound Generator is a very simply Frequency Generator. It can provide sound frequencies in range from 1Hz to 25,000Hz. To use Frequency Generator, you could swipe your finger up and down to raise or lower the frequency of the tones. The user interface is very simple and clear. You could adjust the frequency up or down exactly in 1Hz with arrow button, and directly check the frequency by professional wave visualization. The human can hear from 20Hz to 20,000HZ, and you can use Frequency Generator to test your hearing. Usage scenarias: 1. Use Frequency Generator to annoy dogs, cats or people. 2. Use this app as dog whistle to train your dog or other pets. 3. Stop your neighbour’s dog from barking by adjusting the sound frequency until it works. 4. Use this app to tease your classmates or friends as a prank tool. 5. Mosquito repellent. Frequency Generator is easy to allow you to generate tones range from 0Hz to Ultrasonic 25kHz frequency. 1. Frequency Slider Scale - Choose between Logarithmic and Linear adjustment modes for precise frequency control 2. Adjustable Sensitivity - Select High, Medium, or Low sensitivity to match your preference for slider responsiveness 3. Multiple Waveforms - Generate different sound types including Sine, Square, Sawtooth, and Triangle waves 4. Custom Frequency Range - Set your preferred frequency range from 1 Hz to 25,000 Hz for personalized sound generation 5. Enhanced Settings - Intuitive settings interface for easy customization of all tone generation parameters Subscription Information : Frequency Sound Generator App offers an auto-renewing yearly subscription at $19.99 USD/year and auto-renewing weekly subscription at $5.99 USD/week to provide you with unlimited access to all premium features while you maintain an active subscription. Payment will be charged to the payment method connected to your iTunes Account when you confirm the initial subscription purchase. Subscriptions automatically renew unless auto-renew is turned off at least 24-hours before the end of the current subscription period. Your account will be charged for renewal within 24-hours prior to the end of the current period. You may manage your subscription and auto-renewal may be turned off by going to your Account Settings after purchase. Terms of service: http://fireappspro.com/tone/frequency_terms_of_use.html Privacy policy: http://www.fireappspro.com/#portfolio Please get in touch if you have any problems via email.
Screenshots
Verdict
The clearest difference is price: Frequency Sound Generator App at Free against Blue Box's $4.99. Frequency Sound Generator App also leads on ratings volume (4.8K vs 3) and update cadence (every 2 months vs every 7 months). Blue Box's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 2). On 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
Frequency Sound Generator App is free to download; Blue Box costs $4.99 up front. Frequency Sound Generator App sells 2 in-app purchases, starting at $5.99 per 7 days. Blue Box asks for nothing beyond the download.
Blue Box holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Frequency Sound Generator App has 4.8K ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 56% of Blue Box's written reviews are positive against 66% of Frequency Sound Generator App's, so the app with the better star average is not the one people write more warmly about.
Blue Box ships an update every 7 months, Frequency Sound Generator App every 2 months. The most recent releases landed on September 11, 2026 and September 24, 2026 respectively.
| Parameter | Blue Box | Frequency Sound Generator App |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 5.0 (3 ratings) — better | 4.5 (4.8K ratings) |
| Positive reviews | 55.6% of reviews | 66.3% of reviews — better |
| Number of ratings | 3 | 4.8K — better |
| Update frequency | Every 7 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid — better | Subscription |
| Best chart rank | #192 — better | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 2 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Sunshine Valley Systems | Min Ku |
Customer experience
Blue Box
Frequency Sound Generator App
Bugs and requests
Blue Box
Not enough reviews yet to summarise bugs or requests.
Frequency Sound Generator App
Reported bugs
3 issues- Frequency slider is overly sensitive
- Displayed frequency doesn't match actual output
- Inconsistent behavior between 'Play' and 'Mode' buttons
Requested features
4 requests- Option to save favorite frequencies
- Ability to type in specific frequency values
- Background playback support
- Paid ad-free version
In-app purchases
Blue Box
No in-app purchases
Frequency Sound Generator App
- Unlimited Access Weekly Plan$5.997 Days
- Unlimited Access Yearly Plan$19.991 Year
Questions
Is Blue Box free?
Is Frequency Sound Generator App free?
Which has better reviews, Blue Box or Frequency Sound Generator App?
Do Blue Box or Frequency Sound Generator App have ads?
Which is updated more often, Blue Box or Frequency Sound Generator App?
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