Comparison

Altitude Checker vs A WARMER

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

Head to head
About

Altitude Checker

Measure altitude using your device's location or by selecting points on a map. Offers various measurement modes and customizable settings for units, datums, and coordinate systems. Includes an option to display addresses or coordinates.

Highlights
  • Map Measurement Mode
  • GNSS Mode
  • Digital Elevation Model (DEM) data
  • Unit selection (Meter/Foot)
  • Special Datum options
  • Coordinate System selection
  • Address/Coordinate display
Features
Read full description

This app is a tool for measuring altitude, either at your current location or at arbitrary points. The app offers two measurement modes: Map Measurement Mode and GNSS Mode. Map Measurement Mode: When you launch the app, it enters this mode. In Map Measurement Mode, the app measures the altitude of the center position of a map using a digital elevation model (DEM). The app utilizes SRTM30 V2 data for altitude measurements. If you enable the “Use GSI’s API” switch in the settings, it can also make use of GSI’s API to obtain the altitude of Fundamental Geospatial Data (FGD) in Japan. GNSS Mode: Tapping on the “Get GNSS Altitude” button activates the GNSS Mode. In this mode, altitude is calculated using GNSS data. For users with an iPhone 3GS or earlier, the returned value represents ellipsoidal height. Settings: - Unit: Choose between Meter and Foot for altitude measurements. - Special Datum: Select from Default (MSL), A. P. (Arakawa), Y. P., O. P., K. P., S. P., A. P. (Yoshinogawa), T. P. W., and B. S. L. - Coordinate System: Opt for “Japan Plane Rectangular Coordinate System” instead of Latitude-Longitude. - Display Address: Toggle this switch to display the address of the current location. When it’s off, coordinates are shown instead of an address. - Use GSI’s API: As mentioned previously. - Use GSI Tiles: Choose to use GSI tiles instead of Apple Maps. - Update to Map Coordinates: Automatically update coordinates on the “Move Anywhere” page to the current position on the maps. - Use Light Mode for Maps: Maps are displayed in Light Mode, even when Dark Mode is enabled. About URL Scheme: - Format: alt://lat/long - lat: Latitude (double value) - long: Longitude (double value) If the latitude is not within the range of ±90 degrees, it will be replaced with the latitude and the longitude.

About

A WARMER

This app controls smart downwear featuring a Japanese heat system. It integrates IT and fashion for wearable devices, combining advanced fiber materials with technology to innovate sports apparel.

Highlights
  • Japanese heat system control
  • Wearable device integration
  • IT and fashion fusion
  • Smart apparel management
  • Advanced fiber material technology
Features
Read full description

【A WARMER】 化学・IT・ファッション、3つの異なる企業が共同で開発した、日本発のヒートシステムを搭載したダウンウェア専用アプリ ・Wearable 「IT技術とファッションを融合し、人々の生活を確信し続ける」をブランドコンセプトに、心拍センサー付スポーツウェアやヒーティングシステム付ジャケット等、ウェアラブルデバイスを搭載したアパレル商品を展開するITファッションブランドです。 ・DuPont™ INTEXAR™ DuPont™社は、世界で4番目に大きい化学企業であり、ポリマーと織物関連科学の分野においても、1900年代初頭から長きにわたって世界的な企業として業界をリードしています。Wearable社とは業務提携を結び、自社が持つ高性能繊維素材とWearable社のITビジネスで培った技術を駆使し、これまでに無いスポーツウェアを開発、世の中のスポーツライフの革新を目指しています。

Screenshots

Altitude Checker3 screens
A WARMER4 screens

Verdict

The call

The clearest difference is review sentiment: Altitude Checker at 83% against A WARMER's 7%. Altitude Checker also leads on rating (4.0 vs 1.8). A WARMER's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume 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. Altitude Checker sells 1 one-off in-app purchase. A WARMER asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Altitude Checker holds the better App Store score, 4.0 against 1.8. Both are backed by a comparable volume of ratings — 4 and 6 respectively. Written reviews point the same way: 83% of Altitude Checker's written reviews are positive against 7% of A WARMER's.

UpkeepUpdate frequency

Altitude Checker ships an update every 4 months, A WARMER every 2 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 3 level
Altitude Checker versus A WARMER: the parameters behind the verdict, then further details
ParameterAltitude CheckerA WARMER
PriceFreeFree
Rating4.0 (4 ratings) — better1.8 (6 ratings)
Positive reviews83.3% of reviews — better7.1% of reviews
Number of ratings46 — better
Update frequencyEvery 4 monthsEvery 2 months — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.010.0 — better
Further details — not scored
Size282 MB19 MB
Age rating4+4+
DeveloperTakafumi AMANOAdastria Co., Ltd.

Customer experience

Altitude Checker

All ratings4 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews18 reviews
Positive83.3%
Neutral11.1%
Negative5.6%

A WARMER

All ratings6 ratings
Positive16.7%
Neutral16.7%
Negative66.7%
Written reviews14 reviews
Positive7.1%
Neutral14.3%
Negative78.6%

In-app purchases

1 purchases

Altitude Checker

One-time1
  • Remove Ads$1.99
None

A WARMER

No in-app purchases

Questions

Is Altitude Checker free?
Altitude Checker is free to download, with in-app purchases available.
Is A WARMER free?
A WARMER is free to download, with no in-app purchases.
Which has better reviews, Altitude Checker or A WARMER?
Altitude Checker is rated higher. Altitude Checker averages 4.0 out of 5 from 4 ratings, while A WARMER averages 1.8 from 6 ratings.
Do Altitude Checker or A WARMER have ads?
Altitude Checker shows ads; A WARMER does not.
Which is updated more often, Altitude Checker or A WARMER?
Altitude Checker ships an update every 4 months, and A WARMER every 2 months. Most recently, Altitude Checker was updated on November 6, 2026 and A WARMER on November 3, 2026.

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