Comparison

Blue Box vs Generate Frequency Sounds Hz

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

Head to head
About

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.

Highlights
  • 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
Features
Currently charting
Read full description

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.

About

Generate Frequency Sounds Hz

Generate various sound waves and frequencies with this utility app. It offers single and multi-oscillator modes, binaural beats, and a dedicated test for bass and sub-woofers. Explore ultrasonic sounds and noise generation.

Highlights
  • Single oscillator for single frequency waves
  • Multi-oscillator for multiple sound waves
  • Binaural beats with carrier and beat frequencies
  • Bass/sub-woofer testing
  • Generate ultrasonic sound and noise
Features
Read full description

If you want to generate sound waves at different frequencies and in different patterns then using this app you can do so. In Generate Frequency Sounds Hz app you will get the following options: 1) Single Oscillator: - Here you can generate a single frequency wave. 2) Multi Oscillator: - Here you can generate multiple sound waves with the same or different frequencies. 3) Binaural Beats: - Here you can set a carrier frequency and a beast frequency. 4) Bass/Sub-woofers Test: - For this test, you have to use your headphones or sub-woofers. So download the Generate Frequency Sounds Hz app to create different sound wave frequencies, ultrasonic sound, noise, sound effects, etc. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Blue Box4 screens
Generate Frequency Sounds Hz4 screens

Verdict

The call

The clearest difference is price: Generate Frequency Sounds Hz at Free against Blue Box's $4.99. Generate Frequency Sounds Hz also leads on ratings volume (14 vs 3). Blue Box's advantage is rating (5.0 vs 3.6) and in-app purchases (none vs 3). On update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Generate Frequency Sounds Hz is free to download; Blue Box costs $4.99 up front. Generate Frequency Sounds Hz sells 3 in-app purchases, starting at $4.99 per 7 days. Blue Box asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Blue Box holds the better App Store score, 5.0 against 3.6. Both are backed by a comparable volume of ratings — 3 and 14 respectively. Written reviews point the same way: 56% of Blue Box's written reviews are positive against 30% of Generate Frequency Sounds Hz's.

UpkeepUpdate frequency

Blue Box ships an update every 7 months, Generate Frequency Sounds Hz every 4 months. The most recent releases landed on September 11, 2026 and August 18, 2026 respectively.

Scorecard8 real differences · 3 level
Blue Box versus Generate Frequency Sounds Hz: the parameters behind the verdict, then further details
ParameterBlue BoxGenerate Frequency Sounds Hz
Price$4.99Free — better
Rating5.0 (3 ratings) — better3.6 (14 ratings)
Positive reviews55.6% of reviews — better30.0% of reviews
Number of ratings314 — better
Update frequencyEvery 7 monthsEvery 4 months — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidAd-supported — better
Best chart rank#192 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size2 MB8 MB
Age rating4+4+
DeveloperSunshine Valley SystemsKevin Ghori

Customer experience

Blue Box

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews18 reviews
Positive55.6%
Neutral0.0%
Negative44.4%

Generate Frequency Sounds Hz

All ratings14 ratings
Positive64.3%
Neutral0.0%
Negative35.7%
Written reviews10 reviews
Positive30.0%
Neutral0.0%
Negative70.0%

In-app purchases

None

Blue Box

No in-app purchases

3 purchases

Generate Frequency Sounds Hz

Subscriptions3
  • Generate Frequency Weekly Plan$4.997 Days
  • Generate Frequency Monthly Plan$9.991 Month
  • Generate Frequency Yearly Plan$49.991 Year

Questions

Is Blue Box free?
Blue Box costs $4.99, with no in-app purchases.
Is Generate Frequency Sounds Hz free?
Generate Frequency Sounds Hz is free to download, with in-app purchases available.
Which has better reviews, Blue Box or Generate Frequency Sounds Hz?
Blue Box is rated higher. Blue Box averages 5.0 out of 5 from 3 ratings, while Generate Frequency Sounds Hz averages 3.6 from 14 ratings.
Do Blue Box or Generate Frequency Sounds Hz have ads?
Generate Frequency Sounds Hz shows ads; Blue Box does not.
Which is updated more often, Blue Box or Generate Frequency Sounds Hz?
Blue Box ships an update every 7 months, and Generate Frequency Sounds Hz every 4 months. Most recently, Blue Box was updated on September 11, 2026 and Generate Frequency Sounds Hz on August 18, 2026.

Other comparisons