Comparison

Blue Box vs rDialer Calling Card Dialer

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
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

rDialer Calling Card Dialer

Automate your calling card or prepaid calls with this dialer. Predefine access numbers and PINs to save time dialing international numbers. Supports multiple calling cards and syncs with your contacts.

Highlights
  • Automated calling card dialing
  • Predefined access numbers and PINs
  • Syncs with phone contacts
  • Multi-card support
  • Pin and Pin-Less dialing modes
  • Works over cellular network
Features
Read full description

Rapidsoft Systems rDialer Calling Card(CC) Dialer is a simple calling card dialer that helps you automate your calling card or prepaid calls. Feel free to call us if you run into any problem, and we will provide necessary support. Once you have configured your local access number and Pin (optional), you don't have to remember it again. You can straight away dial the actual international number saving you time to dial. rDialerCC is supported 24x7 by a Mid Size US company. It has two modes: calling card with Pin and Pin-Less dialing. - Easy to use: Access number & pin of calling card/ access server can be predefined, users doesn't need to enter again. - Multi-card support. - The application automatically syncs with all your phones contacts. - You can dial manually or select the number directly from the contacts tab. - Works over a cellular network, no wireless or Wi-Fi data connection needed. - Attractive Dial Pad Design. - No Advertisement. - Tested with multiple operators. WHITE LABLED OPERATOR VERSION Rapidsoft systems also offers white labeled rDialerCC for VOIP operators to allow mobile users to make Pinless long distance or international calls. rDialerCC is available for service providers who can use this calling card dialer and get it integrated with their existing calling card server. These dialers use DTMF dial tone to dial out a called party number. Since these dialers don't use SIP, they can work anywhere and on any cellular network. However, these dialers use local cellular minutes of the users. We provide separate SIP dialers that are designed for VoIP network where SIP is an appropriate medium for calling. - The operator version of dialer provides selection of local access number. A list of access number can be preloaded on the phone or can be updated from a server. Feel free to call us if you run into any problem, and we will provide necessary support.

Screenshots

Blue Box4 screens
rDialer Calling Card Dialer3 screens

Verdict

The call

The clearest difference is price: rDialer Calling Card Dialer at Free against Blue Box's $4.99. rDialer Calling Card Dialer also leads on iOS requirement (6.0 vs 15.0). Blue Box's advantage is rating (4.5 vs 2.5) and review sentiment (56% vs 20%). On ratings volume, ads 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

rDialer Calling Card Dialer is free to download; Blue Box costs $4.99 up front. rDialer Calling Card Dialer sells 1 one-off in-app purchase. Blue Box asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Blue Box holds the better App Store score, 4.5 against 2.5. Both are backed by a comparable volume of ratings — 4 and 2 respectively. Written reviews point the same way: 56% of Blue Box's written reviews are positive against 20% of rDialer Calling Card Dialer's.

UpkeepUpdate frequency

Blue Box ships an update every 7 months, rDialer Calling Card Dialer every 15 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

Scorecard7 real differences · 3 level
Blue Box versus rDialer Calling Card Dialer: the parameters behind the verdict, then further details
ParameterBlue BoxrDialer Calling Card Dialer
Price$4.99Free — better
Rating4.5 (4 ratings) — better2.5 (2 ratings)
Positive reviews55.6% of reviews — better20.0% of reviews
Number of ratings4 — better2
Update frequencyEvery 7 months — betterEvery 15 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.06.0 — better
Further details — not scored
Size2 MB3 MB
Age rating4+4+
DeveloperSunshine Valley SystemsRapidsoft Systems

Customer experience

Blue Box

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

rDialer Calling Card Dialer

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews5 reviews
Positive20.0%
Neutral0.0%
Negative80.0%

In-app purchases

None

Blue Box

No in-app purchases

1 purchases

rDialer Calling Card Dialer

One-time1
  • rDialer Calling Card Dialer$3.99

Questions

Is Blue Box free?
Blue Box costs $4.99, with no in-app purchases.
Is rDialer Calling Card Dialer free?
rDialer Calling Card Dialer is free to download, with in-app purchases available.
Which has better reviews, Blue Box or rDialer Calling Card Dialer?
Blue Box is rated higher. Blue Box averages 4.5 out of 5 from 4 ratings, while rDialer Calling Card Dialer averages 2.5 from 2 ratings.
Do Blue Box or rDialer Calling Card Dialer have ads?
Neither Blue Box nor rDialer Calling Card Dialer shows ads.
Which is updated more often, Blue Box or rDialer Calling Card Dialer?
Blue Box ships an update every 7 months, and rDialer Calling Card Dialer every 15 months. Most recently, Blue Box was updated on November 6, 2026 and rDialer Calling Card Dialer on November 1, 2026.

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