Comparison

DTMF Decoder 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

DTMF Decoder

This utility transforms your iPhone into a DTMF tone decoder. It listens to DTMF tones through the microphone and displays the dialed numbers. Decoded digits can be easily copied to the clipboard for further use.

Highlights
  • DTMF tone decoding
  • Microphone input
  • Displays dialed numbers
  • Copy to clipboard
  • Source code available
Features
Read full description

Turns your iPhone into a simple DTMF decoder. Simply hold the iPhone's microphone near to a clear source of DTMF tones (telephone "Touch Tones") and it will display the numbers being dialed. The decoded digits are also placed into a text area from which you can copy them to the clipboard. See it in action here: https://www.youtube.com/watch?v=l_QD8KFCJPw Source code freely available: https://github.com/veghead/ios-dtmf-decoder

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

DTMF Decoder3 screens
rDialer Calling Card Dialer3 screens

Verdict

The call

The clearest difference is price: rDialer Calling Card Dialer at Free against DTMF Decoder's $0.99. rDialer Calling Card Dialer also leads on iOS requirement (6.0 vs 11.0). DTMF Decoder's advantage is in-app purchases (none vs 1) and review sentiment (40% vs 20%). On rating, update cadence, ads and monetization model 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; DTMF Decoder costs $0.99 up front. rDialer Calling Card Dialer sells 1 one-off in-app purchase. DTMF Decoder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 2.5 for DTMF Decoder against 2.5 for rDialer Calling Card Dialer. That said, the two scores are not equally well evidenced: DTMF Decoder has 17 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 40% of DTMF Decoder's written reviews are positive against 20% of rDialer Calling Card Dialer's.

UpkeepUpdate frequency

DTMF Decoder ships an update every 19 months, rDialer Calling Card Dialer every 15 months. The most recent releases landed on September 23, 2026 and June 5, 2026 respectively.

Scorecard5 real differences · 5 level
DTMF Decoder versus rDialer Calling Card Dialer: the parameters behind the verdict, then further details
ParameterDTMF DecoderrDialer Calling Card Dialer
Price$0.99Free — better
Rating2.5 (17 ratings)2.5 (2 ratings)
Positive reviews40.4% of reviews — better20.0% of reviews
Number of ratings17 — better2
Update frequencyEvery 19 monthsEvery 15 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS11.06.0 — better
Further details — not scored
Size5 MB3 MB
Age rating4+4+
Developerdreadtech.comRapidsoft Systems, Inc.

Customer experience

DTMF Decoder

All ratings17 ratings
Positive29.4%
Neutral11.8%
Negative58.8%
Written reviews57 reviews
Positive40.4%
Neutral5.3%
Negative54.4%

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

DTMF Decoder

No in-app purchases

1 purchases

rDialer Calling Card Dialer

One-time1
  • rDialer Calling Card Dialer$3.99

Questions

Is DTMF Decoder free?
DTMF Decoder costs $0.99, 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, DTMF Decoder or rDialer Calling Card Dialer?
DTMF Decoder and rDialer Calling Card Dialer are both rated 2.5 out of 5 on the App Store, from 17 and 2 ratings respectively.
Do DTMF Decoder or rDialer Calling Card Dialer have ads?
Neither DTMF Decoder nor rDialer Calling Card Dialer shows ads.
Which is updated more often, DTMF Decoder or rDialer Calling Card Dialer?
DTMF Decoder ships an update every 19 months, and rDialer Calling Card Dialer every 15 months. Most recently, DTMF Decoder was updated on September 23, 2026 and rDialer Calling Card Dialer on June 5, 2026.

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