LISTENING DEVICE - HEARING AID icon

Application Development 21

For individuals with hearing impairments seeking accessible, low-cost alternatives to traditional hearing aids.

1app4.3(1.5K)Medical

Snapshot

Who is Application Development 21?

Providing accessible hearing assistance through smartphone-based sound amplification and noise reduction tools.

Target audience

Individuals with hearing impairments seeking accessibleLow-cost alternatives to traditional hearing aids

Active nemesis

Firehawk

Other rivals

Portfolio

Free 1
1
app
Medical1

Last updated

LISTENING DEVICE - HEARING AID

v3.7.1

8mo ago

Maintenance

Publisher DNA

What defines Application Development 21?

Publisher DNA

Primary focus

Medical utility apps · hearing assistance

Scale

indie

Target audience

Individuals with hearing impairments seeking accessible, low-cost alternatives to traditional hearing aids.

Signature Patterns

  • •Focus on medical-utility software for hearing assistance
  • •Integration of built-in hearing tests and noise reduction algorithms
  • •Free-to-use pricing model
  • •Targeting accessibility and ease of use for non-specialist users
Maintenance

Portfolio momentum

Released 2 updates in the last 6 months for their single active application, indicating a maintenance-focused development cycle.

Last release 50d agoActive apps 1

Company profile

low confidence
Founded
2018

Portfolio

What does Application Development 21 ship?

Apps

1 app analysed

Rivals

Who does Application Development 21 compete with?

The rivals identified

Nemeses(1)

Firehawk

known forHearing Aid App for Android

2 apps4.4Medical

Both applications target individuals with hearing impairments and provide free sound amplification tools on mobile devices.

Same space(8)

Algorithm electronics

known forHearing Aid APP:PETRALEX 4 EAR

1 app4.5Medical

This app provides personalized audio amplification for mild hearing loss, directly competing with the source app's core sound profile functionality.

Best Translate

known forVolume Booster Bass Booster EQ

1 app4.6Medical

This app focuses on media volume enhancement rather than clinical hearing assistance, serving as a peripheral tool for audio consumption.

e-audiologia.pl

known forHearing Test

1 app4.9Medical

This app provides diagnostic assessment of hearing thresholds, complementing the source app's corrective amplification features.

Power Star APPS

known forMicrophone-​Voice Amplifier

1 app4.0Medical

This app offers real-time voice amplification and Bluetooth microphone functionality, overlapping with the source app's live audio processing features.

Sivantos Pte

known forAudioService App

2 apps3.4Medical

This app acts as a remote control for specific hearing aid hardware, focusing on device management rather than general audio processing.

Sonova AG

known forHearing Remote

2 apps4.4Medical

This app manages hardware-specific settings for Sonova hearing aids, functioning as a clinical bridge rather than a standalone amplifier.

Wallet Passes Alliance

known forHearing from Distance: Spy Ear

1 app4.6Medical

This tool targets users seeking distant sound pickup, acting as a specialized alternative to the source app's general amplification.

ZipoApps

known forMicrophone Amplifier

1 app4.4Medical

This app serves as a general audio projection tool for public speaking, overlapping with the source app's sound amplification feature.

New entrants(1)

Mido Music

known forMicrophone Amplifier: Live Mic

1 app0.0Medical

This app functions as a live megaphone and audio booster, providing a broader utility for public speaking compared to the source app's medical focus.

The Analyst's Read

The bottom line on Application Development 21

Bottom line

Application Development 21 maintains a singular, focused product strategy within the medical utility category. Their value proposition is built on accessibility and software-driven hardware augmentation, serving a specific demographic of users seeking alternatives to traditional hearing aids.

Frequently asked questions

How many apps does Application Development 21 publish?
Application Development 21 has 1 app tracked by Marlvel, primarily in the Medical category.
What kind of apps does Application Development 21 make?
Application Development 21's portfolio is concentrated in Medical, with an average rating of 4.3/5 across rated apps.
What is Application Development 21's top app?
By review volume across the portfolio, LISTENING DEVICE - HEARING AID is Application Development 21's best-known app tracked by Marlvel.

What fed this analysis

Apps analyzed:
1
With full intel:
0
With overview:
1
Website scraped:
yes
Social presence:
no

Disclosure: Independent intel to help mobile builders succeed.

AI-powered analysis with automated quality gates, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by Application Development 21, its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

Cite this report

Marlvel.ai. “Application Development 21 intelligence.” Updated 2026-05-09. https://marlvel.ai/publishers/application-development-21

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Data licensed under CC-BY-NC 4.0