Comparison

STL Viewer vs NEN

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

Head to head
About

STL Viewer

View, explore, and edit 3D models on your iPhone or iPad. Basic viewing is included with purchase, with optional upgrades for advanced creation, editing, and reporting features. Models are processed locally for privacy.

Highlights
  • Open and view STL files
  • Rotate, pan, and zoom models
  • Basic model information inspection
  • Create and edit 3D models
  • Measure distances and angles
  • Export to multiple file formats
  • Generate local PDF reports
Features
Read full description

Open your STL file on iPhone or iPad and examine the model with rotation, zoom and technical views. Your app purchase includes basic viewing without a subscription. Pro and Studio are optional upgrades for creation, editing, inspection and reports. BASIC VIEWER Open binary or ASCII STL files. Orbit, pan and zoom, switch camera views, and inspect basic model information in solid or wireframe mode. PRO WORKSPACE Build with primitives and profiles; extrude and revolve shapes. Transform objects, preview Boolean operations and plane cuts, and use mesh repair tools. Organize multiple objects in local projects with undo, redo and saved revisions. Measure distances, angles and radii, and inspect sampled estimates of wall thickness and surface deviation. Export STL, OBJ, PLY, 3MF and GLB files, capture PNG images, and opt into project reminders. STUDIO REPORTS Studio includes Pro and adds local PDF reports with project information, geometry summaries and inspection annotations. IMPORTANT LIMITS Models are processed on your device, not uploaded to our servers. Projects and revisions are local. This app does not include cloud collaboration, SSO, STEP/B-rep CAD or manufacturing certification. Thickness and surface comparisons are sampled estimates, not certified measurements. File formats and mesh operations have safety limits and restrictions shown in the tools. STL does not record units; choose the correct unit for your model. OPTIONAL PLANS The app download is paid. Basic viewing needs no subscription. Creation, editing and advanced inspection require Pro or Studio; PDF reports require Studio. Monthly/annual subscriptions and Pro Lifetime are optional. The App Store displays prices and periods before purchase. Subscriptions renew automatically until cancelled in your Apple account settings. Restore Purchases is available in the app. Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://softwareideal.com.br/policy.html Support: https://softwareideal.com.br

About

NEN

This app provides a calm, Pomodoro-style focus timer designed for deep work and study sessions. It helps users maintain attention with clear progress tracking and distraction-resistant routines, offering customizable break intervals and app blocking features.

Highlights
  • Focus, short break, and long break sessions
  • Clear timer progress and round tracking
  • Focus categories for different work types
  • Block selected apps during focus (Pro)
  • Apple Watch controls
  • Live Activities and widgets
  • Session history and progress insights
Features
Read full description

NEN is a calm Pomodoro-style focus timer for iPhone and Apple Watch, built for deep work, study sessions, real breaks, and distraction-resistant routines. Start a focus session, move through short and long breaks, and keep your attention on the work in front of you. NEN is built around a simple Pomodoro-style timer flow with a quiet visual style, clear session progress, and useful controls when you need them. Use NEN for deep work, study blocks, writing sessions, coding, reading, or any routine where you want a focused rhythm without extra noise. Features: - Focus, short break, and long break sessions - Clear timer progress and round tracking - Focus categories for different kinds of work - Block selected apps during focus with NEN Pro - Apple Watch controls - Live Activities and widgets - Session history and progress insights - Optional NEN Pro lifetime unlock for deeper focus tools NEN is made for people who want a focused timer that feels calm, native, and easy to return to every day.

Screenshots

STL Viewer2 screens
NEN4 screens

Verdict

The call

The clearest difference is price: NEN at Free against STL Viewer's $0.99. NEN also leads on update cadence (every 5 days vs every 4 weeks) and ratings volume (3 vs 1). On rating, review sentiment, ads and in-app purchases there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

NEN is free to download; STL Viewer costs $0.99 up front. STL Viewer sells 5 in-app purchases, starting at $2.99 per month and NEN sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for STL Viewer against 5.0 for NEN. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

STL Viewer ships an update every 4 weeks, NEN every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
STL Viewer versus NEN: the parameters behind the verdict, then further details
ParameterSTL ViewerNEN
Price$0.99Free — better
Rating5.0 (1 ratings)5.0 (3 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings13 — better
Update frequencyEvery 4 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS17.0 — better17.5
Further details — not scored
Size5 MB6 MB
Age rating4+4+
DeveloperFelipe Marques de BarrosNijanthan Vijayakumar

Customer experience

STL Viewer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

NEN

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

5 purchases

STL Viewer

Subscriptions4
  • STL Viewer Pro Mensal$2.991 Month
  • STL Viewer Studio Mensal$5.991 Month
  • STL Viewer Pro Anual$22.991 Year
Show 1 more
  • STL Viewer Studio Anual$49.991 Year
One-time1
  • STL Viewer Pro Vitalício$39.99
1 purchases

NEN

One-time1
  • NEN Lifetime Unlock$2.39

Questions

Is STL Viewer free?
STL Viewer costs $0.99, and also offers in-app purchases.
Is NEN free?
NEN is free to download, with in-app purchases available.
Which has better reviews, STL Viewer or NEN?
STL Viewer and NEN are both rated 5.0 out of 5 on the App Store, from 1 and 3 ratings respectively.
Do STL Viewer or NEN have ads?
Neither STL Viewer nor NEN shows ads.
Which is updated more often, STL Viewer or NEN?
STL Viewer ships an update every 4 weeks, and NEN every 5 days. Most recently, STL Viewer was updated on November 3, 2026 and NEN on October 31, 2026.

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