Comparison

1Lens vs OneOpen

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

Head to head
About

1Lens

Features
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1Lens is a metacognition practice and reflection tool. Choose a mental model you want to work on, record your decisions and actions in everyday situations, and look back on what changed. β€’ Practice mental models: Start with built-in models such as First Principles, Win-Win Thinking, and Growth Mindset, or create your own. Keep up to three models active to stay focused. β€’ Record wins and misses: Note what went well or where you fell short. Make a specific β€œIf…then…” plan for your next attempt. β€’ Reflect with voice: Record your thoughts and, when supported by the device, transcribe them with Apple’s system speech recognition. Recordings, transcripts, and practice entries stay on your device. β€’ Review your progress: Browse recent daily entries and reflection history, and use your practice streak to notice your rhythm. β€’ Make it yours: Edit or archive models, then reactivate them from the full list whenever you are ready. Optional reminders can help you build a routine. Take a moment to notice how you think, then choose what to do next. Microphone access is used to record voice reflections. Speech recognition access is used for on-device transcription. Recording starts only when you choose to begin.

About

OneOpen

Features
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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) β€’ Pan, zoom and toggle layers in supported DWG/DXF 2D model-space drawings. β€’ Rotate STEP/STP, IGES/IGS, BREP/BRP, STL, OBJ and PLY models, including PLY vertex colors and point clouds. β€’ 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. β€’ 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. β€’ USDZ starts in object view; choose AR when needed. β€’ 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

1Lens4 screens
OneOpen4 screens

Verdict

The call

The clearest difference is price: OneOpen at Free against 1Lens's $0.99. 1Lens's advantage is in-app purchases (none vs 2) and update cadence (daily vs every 3 days). On ads, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

OneOpen is free to download; 1Lens costs $0.99 up front. OneOpen sells 2 in-app purchases, starting at $0.99 per year. 1Lens asks for nothing beyond the download.

UpkeepUpdate frequency

1Lens ships an update daily, OneOpen every 3 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard3 real differences Β· 3 level
1Lens versus OneOpen: the parameters behind the verdict, then further details
Parameter1LensOneOpen
Price$0.99Free β€” better
Update frequencyDaily β€” betterEvery 3 days
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhoneiPhone, iPad β€” better
Requires iOS17.017.0
Further details β€” not scored
Size2 MB75 MB
Age rating4+4+
Developerε‡δΌŸ 朱Freedom Dimension (shenzhen) Technology Co., Ltd

In-app purchases

None

1Lens

No in-app purchases

2 purchases

OneOpen

Subscriptions1
  • Advanced Access Annual$0.991 Year
One-time1
  • Advanced Access Lifetime$2.99

Questions

Is 1Lens free?
1Lens costs $0.99, with no in-app purchases.
Is OneOpen free?
OneOpen is free to download, with in-app purchases available.
Do 1Lens or OneOpen have ads?
Neither 1Lens nor OneOpen shows ads.
Which is updated more often, 1Lens or OneOpen?
1Lens ships an update daily, and OneOpen every 3 days. Most recently, 1Lens was updated on October 30, 2026 and OneOpen on October 31, 2026.

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