Art Clock vs OneOpen
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Art Clock
Customize your device with various clock styles, including flip, LCD, and analog designs. Add matching widgets to your home screen and utilize full-screen display with adjustable brightness. Includes calendar views and countdowns to important events.
- 16 unique clock faces
- Full-screen display with brightness control
- Home screen widgets (small, medium, large)
- Calendar and countdown functionality
- Customizable time format and colors
- Portrait and landscape modes
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Choose a clock face and tap to go full screen. Art Clock offers 24 clock faces, from classic flip clocks and dot matrix displays to retro LCD, minimalist, world clock and analog designs. Keep it on your desk or bedside table, or add a matching widget to your Home Screen. โข CLOCK FACES Choose from a variety of styles, colors and number designs, with flip and dot animations in the app. โข FULL-SCREEN DISPLAY Use your clock in portrait or landscape. Keep the screen awake and adjust the brightness. โข HOME SCREEN WIDGETS Choose small, medium or large widgets. Tap a widget to open its clock face. Show seconds on widgets for Digits, Bedside and Minimal. โข CALENDARS & COUNTDOWNS See the month at a glance, follow the year's progress in a daily grid, or set an event and count the days until it arrives. Customize the colors for Year and Countdown. โข PERSONAL SETTINGS Adjust the time format, date and seconds on supported faces. Each face remembers your choices. Customize the text and background colors of the Solar face. Available for iPhone and iPad. Some clock faces and widgets require PRO, available as a one-time purchase with no subscription.
OneOpen
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OneOpen is a multi-format file viewer for iPhone and iPad. Open documents, web pages, CAD drawings, 3D models and archives from Files, Mail and apps that support document sharing. HTML and Markdown Preview HTML, HTM and XHTML pages. Read Markdown / MD notes with headings, a table of contents, tables, code fences, task lists, footnotes and reference links. ZIP websites retain local images, styles and relative resources. Markdown in packages can display supported local images. Ordinary HTML allows restricted HTTPS/WSS networking by default, with offline and Safe Preview options. Markdown does not run scripts or load remote images. CAD drawings and 3D models (Advanced) โข Pan, zoom and toggle layers in supported DWG/DXF 2D model-space drawings. โข Rotate STEP/STP, IGES/IGS, BREP/BRP, STL, OBJ and PLY models, including PLY vertex colors and point clouds. โข ZIP a complete OBJ model folder to load supported MTL materials, PNG/JPEG textures, normals, transparency and groups. A standalone OBJ shows geometry without reading private neighboring files. โข Preview supported static GLB / glTF 2.0 geometry, nodes, basic materials and PNG/JPEG textures. Model ZIPs retain relative resources. JSON and model information have separate views. โข USDZ starts in object view; choose AR when needed. โข Included models and engineering drawings demonstrate supported features. Everyday viewing is free Read PDF, Office/iWork, images, audio/video, JSON, XML, YAML, CSV, code and text. PDF supports continuous reading, zoom, search and page controls that hide while scrolling. Edit supported text in an independent working copy. Archives and EPUB Browse supported ZIP/7Z/RAR/TAR, GZ/BZ2/XZ/Zstandard/LZ4/LZMA/Z, CAB/CPIO/AR/XAR/ISO9660/LHA and TAR combinations. Open/share entries; extract to Files. ZIP/EPUB are free; others need Advanced Access. EPUB follows the declared chapter order, with a table of contents, previous/next controls, current-chapter search and reading settings. Pages stay offline. A chapter error keeps navigation available. DRM, media overlays, annotations and whole-book search are unsupported. Email, certificates and information Decode EML headers, body text, common character encodings and attachment filenames. Open or share readable attachments independently. HTML email becomes text without loading remote content. Decryption, signature verification and TNEF extraction are not provided. Inspect public CER, DER, CRT and PEM certificate subjects, issuers, validity, algorithms, public keys, usages and SHA-256 fingerprints. Certificates are never installed and device trust is not evaluated. File Information includes PDF metadata, image/camera properties, media tracks, text encoding/line counts and archive summaries. Open from other apps Skippable onboarding uses real iOS screenshots to explain More, Edit and favorite ordering in the share sheet. Revisit it in Settings. Categories, Recents and widgets help you return to files. Advanced Access and compatibility An annual membership or a one-time lifetime purchase unlocks the same specialized features. Check format details before purchasing. DWG supports selected 2D model-space content; DXF supports text files. CAD editing, engineering measurement, native SolidWorks and full external references are unsupported. Compressed glTF geometry, skins and active morphs require conversion. Animation is static; advanced materials may be approximate. ZIP complete model folders, or use self-contained GLB for single-file sharing. Supported ZIP AES/ZipCrypto, 7z AES and RAR4/5 AES/solid archives can open; multipart, Deflate64, Implode and ARJ are unsupported. Native previews depend on iOS codecs/variants. Privacy No account, ads, analytics or document uploads. Non-HTML previews stay offline. HTML and ZIP websites may run JavaScript and connect over HTTPS/WSS in an isolated environment; offline and Safe Preview modes are available. Terms: https://oneapps.studio/terms Privacy: https://oneapps.studio/privacy
Screenshots
Verdict
The clearest difference is review sentiment: Art Clock at 100% against OneOpen's 57%. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Art Clock sells 1 one-off in-app purchase and OneOpen sells 2 in-app purchases, starting at $0.99 per year. Whichever you choose, the download price is not the number that matters.
Art Clock ships an update every 2 days, OneOpen every 3 days. The most recent releases landed on October 30, 2026 and November 1, 2026 respectively.
| Parameter | Art Clock | OneOpen |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews โ better | 57.1% of reviews |
| Update frequency | Every 2 days โ better | Every 3 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | โ |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details โ not scored | ||
| Size | 8 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | ๆฏๅฑฑ ่ฃ | Freedom Dimension (shenzhen) Technology Co., Ltd |
Customer experience
Art Clock
OneOpen
In-app purchases
Art Clock
- Art Clock PRO$2.99
OneOpen
- Advanced Access Annual$0.991 Year
- Advanced Access Lifetime$2.99









