# STP One - STEP CAD Viewer — 3D CAD measure, size, weight

> 3D CAD measure, size, weight (iPhone/iPad app by JAEYUN HWANG.)

- Source: https://appshunter.io/ios/app/stp-one-step-cad-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: Korean
- Released: 2026-08-27
- Data updated: 2026-10-10
- User reviews in markdown: https://appshunter.io/ios/app/stp-one-step-cad-viewer/id6802912144/reviews.md

## What is STP One?

STP One opens STEP and IGES 3D drawings right on your phone — and measures them.

Open a file and the overall dimensions (W x D x H) appear automatically. Tap two points for the distance. Pick a material and the part weight is calculated instantly from the solid volume (245 built-in materials).

- Open STEP (.stp/.step) and IGES (.igs/.iges) 3D files, plus DXF/DWG 2D drawings
- Automatic overall dimensions; measure two-point distance, point-to-edge and face-to-face perpendicular distance
- Section view (X/Y/Z clipping); assembly parts list with hide/transparent per part
- Volume, surface area and weight by material (245 materials)
- Export 2D drawings to PDF and share
- Touch controls: rotate, zoom, pan - a short guide appears on first launch
- Works fully offline - no account, no ads, your drawings never leave the device

For engineers, buyers, QC and sales on the factory floor: check a 3D file anywhere, no CAD seat required.

Free: one file per day with viewing, overall dimensions and edge highlight, plus 3 free uses of every Pro feature.
Pro (monthly or yearly): unlimited files, measurement suite, section view, parts list, weight by material, 2D drawings and PDF share.
Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://erp.lihaon.co.kr/privacy-stpone

## 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 |



## Version history (last 5 releases)

### 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

### 1.3 — 2026-09-02

v1.3 새 기능
• 2D 도면 보기(Pro): DXF·DWG 도면 파일을 바로 열어 확인할 수 있습니다. 한 손가락 이동·두 손가락 확대로 편하게 볼 수 있습니다.
• PDF 공유(Pro): 2D 도면을 인쇄용 PDF로 만들어 카카오톡·메일 등으로 바로 공유합니다.
• 안정성 개선

### 1.2 — 2026-08-31

v1.2 — Pro 측정 기능 대폭 확장 (A급 6종)
- 점→선 직교 거리·면↔면 직교 거리 측정 추가
- 모서리(엣지) 강조 표시
- 단면 보기(클리핑)
- 표면적 계산
- 부품 목록: 부품별 숨김/투명 처리
- 안정성 및 사용성 개선

## Apps similar to STP One

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [OrbitCAD](https://appshunter.io/ios/app/orbitcad/id6786116198) | — | Free | Productivity |
| [Cadaclysm](https://appshunter.io/ios/app/cadaclysm/id6816093395) | — | Free | Productivity |
| [Caddis: DWG & CAD Viewer](https://appshunter.io/ios/app/caddis-dwg-and-cad-viewer/id6799798132) | — | Free | Productivity |
| [DWG, STL & 3D CAD File Viewer](https://appshunter.io/ios/app/dwg-stl-and-3d-cad-file-viewer/id6793832526) | 5.0 (1) | Free | Productivity |
| [CAD Pro - DWG Viewer &  Editor](https://appshunter.io/ios/app/cad-pro-dwg-viewer-and-editor/id6802925362) | — | Free | Productivity |
| [Material Cutting](https://appshunter.io/ios/app/material-cutting/id6450856808) | — | 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)

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

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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 2026-10-10.*