Comparison

OneOpen vs ShiftFlow

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

Head to head
About

OneOpen

Features
Read full description

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) โ€ข Pan, zoom and toggle layers in supported DWG/DXF 2D model-space drawings. โ€ข Rotate STEP/STP, IGES/IGS, BREP/BRP, STL, OBJ and PLY models, including PLY vertex colors and point clouds. โ€ข 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. โ€ข 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. โ€ข USDZ starts in object view; choose AR when needed. โ€ข 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 ZIP, 7Z, RAR, TAR, GZ, BZ2, XZ and supported TAR combinations. Open or share supported entries and save extracted files to Files. ZIP and EPUB remain free; other archive formats require 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 AES/ZipCrypto ZIPs prompt for passwords; unsupported encryption/compression, multipart and RAR3 solid are excluded. 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

About

ShiftFlow

Read full description

Plan work. Make room for life. ShiftFlow is an offline calendar for repeating work shifts. Build a rotation from your own shifts and see workdays, nights and days off together. BUILD A ROTATION Add shifts in order, such as day, day, night, night, rest, rest. Choose the first date and save. Create up to 20 shift types and rotations of up to 60 days, with an explicit schedule time zone. HANDLE DATE CHANGES Select a date, change its shift and add a note. Return to the rotation when plans change again. Shift times support overnight work. REMIND AND SHARE Enable local reminders for each shift at its start or 15, 30, 60 or 120 minutes before. Share an image of the month's schedule when you need to communicate your plans. STATISTICS AND WIDGETS Review shift counts, work hours, workdays, rest days and unassigned days by month, year or a custom period. No wage calculations. Check your rotation with Home Screen or Lock Screen widgets. KEEP DATA ON YOUR DEVICE No account is required. Shifts and notes stay on your device. Export a complete JSON backup; restoring preserves a copy of the previous file. Includes 10 interface languages, light and dark appearance, larger text and reduced animations. One-time paid download with all built-in features included. No ads, subscriptions or in-app feature purchases. Reminders cover up to 60 upcoming work shifts. Reopen the app to extend coverage. iOS permissions, Focus and system settings can affect delivery. Nonexistent daylight-saving times move to the next valid time. Your entries are personal plans: check your employer's official roster. Export a backup before uninstalling or changing devices.

Screenshots

OneOpen4 screens
ShiftFlow4 screens

Verdict

The call

The clearest difference is in-app purchases: ShiftFlow at none against OneOpen's 2. OneOpen's advantage is update cadence (every 3 days vs weekly). On price, ads, device support and iOS requirement 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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. OneOpen sells 2 in-app purchases, starting at $0.99 per year. ShiftFlow asks for nothing beyond the download.

UpkeepUpdate frequency

OneOpen ships an update every 3 days, ShiftFlow weekly. Both last shipped on October 24, 2026.

Scorecard2 real differences ยท 5 level
OneOpen versus ShiftFlow: the parameters behind the verdict, then further details
ParameterOneOpenShiftFlow
PriceFreeFree
Positive reviewsโ€”50.0% of reviews
Update frequencyEvery 3 days โ€” betterWeekly
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPad โ€” betteriPhone
Requires iOS17.017.0
Further details โ€” not scored
Size73 MB3 MB
Age rating4+4+
DeveloperFreedom Dimension (shenzhen) Technology Co., LtdPengPeng Li

In-app purchases

2 purchases

OneOpen

Subscriptions1
  • Advanced Access Annual$0.991 Year
One-time1
  • Advanced Access Lifetime$2.99
None

ShiftFlow

No in-app purchases

Questions

Is OneOpen free?
OneOpen is free to download, with in-app purchases available.
Is ShiftFlow free?
ShiftFlow is free to download, with no in-app purchases.
Do OneOpen or ShiftFlow have ads?
Neither OneOpen nor ShiftFlow shows ads.
Which is updated more often, OneOpen or ShiftFlow?
OneOpen ships an update every 3 days, and ShiftFlow weekly. Most recently, OneOpen was updated on October 24, 2026 and ShiftFlow on October 24, 2026.

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