Comparison

NPC vs Sound Meter

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

Head to head

★ 4.416 ratingsView app →

About

NPC

Features

Read full description

ＡＲ体験アプリです。・アプリ内からダウンロードできるＰＤＦを使ってＡＲが楽しめます。・360度画像、フォトフレーム、映像・音声等が楽しめます。・コンテンツは今後更新・追加されていきます。・ＡＲが体験できるイベント等をプッシュ通知でお知らせします。

About

Sound Meter

This utility app measures ambient noise levels in decibels. It provides a reference table to help users understand safe listening levels and protects their hearing. The app also stores historical measurements for later review.

Highlights

Measures sound level in decibels
Decibel level reference table
Hearing protection guidance
Stores measurement history
Easy to use interface

Features

Read full description

Sound Meter measures the noise and sound level in decibel. Easy to use. - Decibel level table for reference, helps protect your ears from pain - Store history for any consideration later.

Screenshots

NPC3 screens

Sound Meter3 screens

Verdict

The call

The clearest difference is in-app purchases: NPC at none against Sound Meter's 1. NPC also leads on ads (none vs shown) and iOS requirement (11.0 vs 17.0). Sound Meter's advantage is update cadence (every 2 months vs every 34 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sound Meter sells 1 one-off in-app purchase. NPC asks for nothing beyond the download.

UpkeepUpdate frequency

NPC ships an update every 34 months, Sound Meter every 2 months. The most recent releases landed on October 12, 2026 and October 21, 2026 respectively.

Scorecard4 real differences · 6 level

NPC versus Sound Meter: the parameters behind the verdict, then further details
Parameter	NPC	Sound Meter
Price	Free	Free
Rating	—	4.4 (16 ratings) — better
Positive reviews	—	40.0% of reviews
Number of ratings	—	16 — better
Update frequency	Every 34 months	Every 2 months — better
Ads	No — better	Yes
In-app purchases	No — better	Yes
Monetization	—	Free with in-app purchases
Devices	iPhone, iPad, iPod — better	iPhone, iPad
Requires iOS	11.0 — better	17.0
Further details — not scored
Size	127 MB	11 MB
Age rating	4+	4+
Developer	NPC CORPORATION	Hiep Pham

In-app purchases

None

NPC

No in-app purchases

1 purchases

Sound Meter

One-time1

Remove ADs$4.99

Questions

Is NPC free?

NPC is free to download, with no in-app purchases.

Is Sound Meter free?

Sound Meter is free to download, with in-app purchases available.

Do NPC or Sound Meter have ads?

Sound Meter shows ads; NPC does not.

Which is updated more often, NPC or Sound Meter?

NPC ships an update every 34 months, and Sound Meter every 2 months. Most recently, NPC was updated on October 12, 2026 and Sound Meter on October 21, 2026.