VoicePrinter vs D
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VoicePrinter
Analyze sound and voice in real-time with detailed visual representations. Explore human voices, environmental sounds, music, and more. Offers recording, playback, and import/export features with a premium upgrade.
- Real-time sound visualization
- Human voice analysis
- Environmental sound analysis
- Music analysis
- Recording and playback
- Import/export audio files
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Sound is decomposed into two dimensions and displayed continuously over time. The premium version offers a new style of audio recorder/player. This app can be used for analysis of Human voice, Environmental sound, Sound of animals, musics, etc. The specifications are as follows. Sampling rate = 10000 to 44100 Hz Display maximum frequency = 1000 to 22050 Hz Display time range = 2 to 10 seconds Frequency axis display resolution = 100 Time axis display resolution = 10 / sec From version 1.1, recording, playback, import, and export functions based on sound and voiceprints can be used by in-app purchase. In this case, banners will not be displayed. The premium version allows recording, playback, import of external sound source files, and external output. ・Record under the following conditions Sampling frequency = 10000~44100Hz ・Display audio analysis results under the following conditions (audio is played in sync with the analysis screen) Maximum display frequency (high-pitched display frequency limit) = 1000~22050Hz (half the sampling frequency or less) Display time range (time that can be displayed on one screen) = 2~10 seconds Frequency display resolution (frequency axis: number of data displayed on the vertical axis) = 200 points Time axis display resolution (time axis: display interval (pitch) on the horizontal axis) = 50~200ms (10~200 points) ・Importing external audio source files Imports 16-bit linear PCM mono audio sources. (In the case of stereo, only 1ch is imported.) ・External output Outputs as 16-bit linear PCM mono. *To input and output data to iCloud Drive, you must enable iCloud Drive in System Preferences. *******
D
This app helps users track their Daimoku chanting sessions using a stopwatch, manage personal prayers, and set and monitor progress towards chanting goals. It offers trend analysis, reminders, and a calendar for anniversaries, all while functioning offline.
- Offline Daimoku recording
- Prayer management (add, edit, delete)
- Target setting and progress tracking
- Daimoku trend analysis
- Customizable reminders
- Anniversary calendar
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-Function List- 1: Record Daimoku This is a basic function of this app, so I created this to record properly in offline. This app records your Daimoku by Stopwatch, but it is enable to count whenever you open other apps or when your device went sleep until you force termination. When it counting, icon badge will show up on Chant tab. We can use our devices and apps but not always. No worry, you can record it later. 2: Prayers Management You can freely add, edit, and delete your own prayers, and see them always even while chanting. Every prayers has useful attributes such as start date, target end date, category, favorite flag, you can filter by category, and you can change those attributes with your swipe action. When I had managed my prayers by paper book, wrote black line and completed date when completed. You can do it the same thing with this app, and you can see completed and canceled prayers as well as On-Going prayers. I tried not to lose the usefulness of the way of paper. Each prayers can be managed by the status of "On-Going", "Completed", and "Canceled" 3: Target Management When you see, touch, meet, or attend in a meeting, you will resolve things such as 1 hour Daimoku everyday. Or maybe you will start your challenge towards next coming anniversary day. You can use this "Target Management" function to manage your challenge. By checking the actual result of your Daimoku from start date and end date on the beautiful graph, you can know your progress and position against to your target. Of course we will have multiple targets, and this app can manage multiple targets. After complete one target, you can add next one and check the progress. Also you can check back your past results and past targets, because this app manage targets by adding to a target list. 4: Trend Analysis In addition to Target Management, you can check your Daimoku records of last 1 week by daily, last 1 month by daily, and 1 year by monthly. And, you can also check average by weekday, so you will see that "Average of Friday is little behind compared with other weekday" Also, D-Rec has a calendar function, and some anniversaries are set as default. I know that we have our own anniversaries by region and organization. No worry, you can add your own anniversaries on the calendar and target it. By setting some your own anniversaries, you can set the target. 5: Dimoku Amount Calculation This app basically manage your Daimoku by second unit, however, you can also check Daimoku amount at the same time, if you register your Daimoku amount per minute in advance. Is if really 1,000 Daimoku by 20 minutes? Pace is different by individuals, so register your pace. 6: Remind Function I think you used to chant Daimoku everyday and already that's a part of your life. But if you set the remind time, app will tell you "It is the time to chant Daimoku." 7: Calendar Function (Anniversary Register Function) You can check your chanting date and time by calendar. Some anniversaries which are on public home page of SIG, are default set. In addition, you may have your own anniversaries for your local region, and organizations. Yes, you can add any anniversaries on this calendar. It is good to set some anniversaries and set target toward some your anniversaries. 8: language is available in Japanese and English I would like overseas SGI members to use this app, so I created this in both Japanese and English. If you change your iOS device language, the app language change.
Screenshots
Verdict
The clearest difference is in-app purchases: D at none against VoicePrinter's 1. D also leads on ads (none vs shown) and update cadence (every 5 days vs every 47 months). On price 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
Both are free to download. VoicePrinter sells 1 one-off in-app purchase. D asks for nothing beyond the download.
VoicePrinter ships an update every 47 months, D every 5 days. Both last shipped on November 2, 2026.
| Parameter | VoicePrinter | D |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | — | 35.0% of reviews |
| Number of ratings | 1 — better | — |
| Update frequency | Every 47 months | Every 5 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 11.2 — better |
| Further details — not scored | ||
| Size | 5 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | HIROFUMI MARUO | Hiromi Fujita |
Customer experience
VoicePrinter
D
In-app purchases
VoicePrinter
- Premium Functions$0.99
D
No in-app purchases









