Comparison

Secret Stuff vs ARPen

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

Head to head
About

Secret Stuff

Securely store your private photos, videos, and notes with customizable lock options. Organize content into albums, take photos and videos directly within the app, and personalize your experience with custom wallpapers. Transfer files easily via USB.

Highlights
  • Customizable code or picture key lock
  • Organize photos and videos into albums
  • Take photos and videos within the app
  • Store and search personal notes
  • Personalize with custom wallpapers
  • File transfer via USB
Read full description

Welcome to Secret Stuff! • A simple little application to store away your photos, videos, and notes from those "curious" eyes. ;) • We're back after 10+ years! • In this updated version, we've simplified it but still kept it functional for basic needs! Two ways to lock your app! • Traditional Code Key ·· Setup your own code! ·· Up to 10 characters • Special Picture Key! ·· Unique to this app! ·· Forget about remembering a code! Draw it instead! It’s fun! ·· Draw a line on your own picture to be your Picture Key ·· Special algorithm matches speed, direction, and accuracy to unlock ·· Unlimited combinations to deter nosy people ·· Don’t worry! Will you forget? Your brain will remember the picture and as long as the drawing is understandable by you! I bet you'll remember it more than a code! Try it! Personalize • Add your own wallpaper to each of your pages • Wallpaper dynamically scrolls depending on the size of the picture * NEW Grab and scroll the wallpaper yourself — drag it wherever you like, and it gently drifts back on its own! * NEW Dynamic time-based background changes tint as the day starts to end! • Cute transparency for album lists over your background gives this a nice unique setting Easter Egg? * If your background has a person or face, the greeting message will appear there briefly! Like it's talking to you! * If you have dynamic time-based backgrounds with a person, the person will always be in view! Photo / Video Albums • Create albums to store photos / videos • Export or share • Play videos Notes • Store your personal notes • Search through your notes It's simple but sometimes a little simple is good enough! We hope to add more features! Websites • http://www.spacyapps.com • http://www.youtube.com/spacyapps

About

ARPen

Create 3D drawings and models in mid-air using a marker or a custom Bluetooth pen. Explore advanced geometry creation, object manipulation, and depth visualization. Export your creations as STL files.

Highlights
  • Draw freehand in mid-air
  • Create simple and complex geometries
  • Manipulate objects in 3D space
  • Explore depth visualization
  • Export models as STL files
  • Use marker or custom Bluetooth pen
Features
Read full description

The ARPen application enables you to draw in mid-air. By tracking a marker, lines can be created that keep their position in the real world. Printing out a marker is all that is needed to test out this interaction. Or you can build a custom Bluetooth pen to have more options. The pen can be built using simple electronic components and machinery in your local Fab Lab. Detailed instructions are available at http://hci.ac/arpen-ios. With this app you can: - paint freehand in mid-air - create simple geometry shapes like cubes - create complex geometries using sweeps, lofts, revolutions, and merge&intersect operations - explore techniques for moving, rotating, and scaling objects in mid-air - explore different menu techniques - explore depth visualization techniques to show the position of the pen tip relative to other objects in the scene - export the sketch or model as an *.STL file This application is part of the Personal Photonics project, which is funded by the German Federal Ministry of Education and Research (BMBF) as part of their Open Photonics call. For more information, visit https://hci.rwth-aachen.de/arpen

Screenshots

Secret Stuff4 screens
ARPen4 screens

Verdict

The call

The clearest difference is review sentiment: Secret Stuff at 100% against ARPen's 50%. Secret Stuff also leads on update cadence (every 6 weeks vs every 4 months). ARPen's advantage is iOS requirement (14.2 vs 26.0). On price, ads, in-app purchases and monetization model 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Secret Stuff ships an update every 6 weeks, ARPen every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
Secret Stuff versus ARPen: the parameters behind the verdict, then further details
ParameterSecret StuffARPen
PriceFreeFree
Rating—2.5 (2 ratings) — better
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 6 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS26.014.2 — better
Further details — not scored
Size2 MB55 MB
Age rating4+4+
DeveloperWalter MakRWTH Aachen University

Customer experience

Secret Stuff

Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ARPen

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Secret Stuff

No in-app purchases

None

ARPen

No in-app purchases

Questions

Is Secret Stuff free?
Secret Stuff is free to download, with no in-app purchases.
Is ARPen free?
ARPen is free to download, with no in-app purchases.
Do Secret Stuff or ARPen have ads?
Neither Secret Stuff nor ARPen shows ads.
Which is updated more often, Secret Stuff or ARPen?
Secret Stuff ships an update every 6 weeks, and ARPen every 4 months. Most recently, Secret Stuff was updated on November 1, 2026 and ARPen on November 3, 2026.

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