# STP One - STEP 3D Viewer — Measure · Section · Weight

> Measure · Section · Weight (iPhone/iPad app by JAEYUN HWANG.)

- Source: https://appshunter.io/ios/app/stp-one-step-3d-viewer/id6802912144 (this page in markdown: same URL + `.md`)
- Developer: [JAEYUN HWANG](https://appshunter.io/developer/6799562363)
- Category: Productivity, Business
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 13 MB
- Languages: American English, Hindi, Korean, Nepali, Chinese (Simplified, China), European Spanish, Vietnamese
- Released: 2026-08-27
- Data updated: 2026-11-10

## What is STP One?

STP One is a drawing viewer built for the shop floor: open STEP and IGES 3D files and 2D drawings (DXF) right on your phone. The overall size (W×D×H) appears as soon as a file opens, and measurement, section, parts and weight are all in one app.

■ 3D viewing
· Open STEP (.stp/.step) and IGES (.igs/.iges)
· One finger to rotate, two fingers to pan and zoom, [Fit] to recenter
· Overall dimensions shown automatically, plus approximate volume and surface area
· Edge highlight: normal → bold → hidden

■ Measurement (Pro)
· Point-to-point distance with ΔX · ΔY · ΔZ
· Point→edge perpendicular distance
· Face↔face distance between two parallel faces, with the angle between them

■ Section & parts (Pro)
· Section along X/Y/Z — move the slider to cut the model and see inside, flip direction
· Assembly parts list — each part cycles visible → transparent → hidden

■ Weight (Pro)
· 245 built-in materials (steel sheet, stainless steel, non-ferrous metals, spring wire, injection resins, rubber and more)
· Pick a material and get the weight from the model volume instantly

■ 2D drawings (Pro)
· Open 2D drawings (DXF) — one finger to pan, two to zoom
· Export a print-ready A4 PDF and share it by message or e-mail

■ Handy extras
· Reopen your 5 most recent files
· Open drawings sent from other apps
· 7 languages: 한국어 · English · 中文 · Español · Tiếng Việt · हिन्दी · नेपाली

■ Private, on-device processing
· Drawing viewing and calculations run on your device; drawings are not uploaded automatically
· Your original files are never modified
· No sign-up, no ads, no internet connection needed to view drawings

■ Free and Pro
· Free: 1 file per day — 3D view, rotate, overall size, edge highlight
· Pro subscription (monthly/yearly): unlimited files + measurement, section, parts, weight, 2D drawings and PDF sharing
· Every Pro feature can be tried 3 times for free before you subscribe
· Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period; manage or cancel anytime in your store account settings

Whenever you need to check a drawing in manufacturing, design, sales or quality, it is ready the moment you install it.
Developed by LIHAON Co., Ltd., an automotive parts manufacturer.

Optional ERP feedback lets existing LIHAON employees verify their employee ID/name and submit request text, comments and app/device details to the company ERP. Drawings are not attached automatically. Reading drawings requires no employee account. Subscription validation/restoration uses the internet.

Privacy: https://erp.lihaon.co.kr/privacy-stpone
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| 스텝원 Pro 월간 | $9.99 | per month |
| 스텝원 Pro 연간 | $69.99 | per year |


## Is STP One safe?

Not enough ratings yet to assess STP One.

## Is STP One legit?

STP One - STEP 3D Viewer appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for STP One is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.6.2 — 2026-11-10

Seven languages: Korean, English, Chinese, Spanish, Vietnamese, Hindi and Nepali. Fixed clipped titles on the first screen, overlapping feedback buttons and input-field zoom. Improved translations of features and error messages.

### 1.6.0 — 2026-11-02

Refreshed the LIHAON interface and rounded buttons and added an improvement-request list stored locally on your device. Existing CAD viewing and measurement features, Pro subscriptions and trial policies remain unchanged.

### 1.5.1 — 2026-10-07

Added an optional home-screen link to the installation guide for LIHAON PDF, our separate free PDF reader. Available in Korean and English.

### 1.5 — 2026-09-19

- English interface: when the device language is English, buttons, guide and the subscription screen are shown in English (switch KO/EN at the bottom of the in-app guide).
- Display and stability improvements

### 1.4 — 2026-09-03

· 구독 전 무료 체험: 측정·단면·부품·중량·2D 도면·PDF 공유 등 Pro 기능을 각각 3회씩 무료로 써볼 수 있습니다 (버튼의 '체험 N'이 남은 횟수, 다 쓰면 잠금)
· 사용 안내 갱신, 하단 버튼 표시 개선

## Apps similar to STP One

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| --- | --- | --- | --- |
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| [iCAD: CAD Viewer](https://appshunter.io/ios/app/icad-cad-viewer/id6818475452) | — | Free | Productivity |
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| [SnapCAD : DWG,DXF,STEP,STL,3MF](https://appshunter.io/ios/app/snapcad-dwgdxfstepstl3mf/id6756776030) | — | Free | Productivity |

## More apps by JAEYUN HWANG

- [LIHAON ERP](https://appshunter.io/ios/app/lihaon-erp/id6799562361)
- [LIHAON PDF – Simple Reader](https://appshunter.io/ios/app/lihaon-pdf-simple-reader/id6803268167)
- [LIHAON ERP – Business System](https://appshunter.io/ios/app/lihaon-erp-business-system/id6804566484)
- [LIHAON ERP – Company Services](https://appshunter.io/ios/app/lihaon-erp-company-services/id6818146479)
- [핀포인트 — 내 파일 검색](https://appshunter.io/ios/app/id6830838539)

All apps by JAEYUN HWANG: https://appshunter.io/developer/6799562363

## Related topics

[kdview](https://appshunter.io/ios/topics/kdview) · [arraycalc viewer](https://appshunter.io/ios/topics/arraycalc-viewer)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-11-10.*