Comparison

SpoolTool vs Simple Hidden Note

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

Head to head
About

SpoolTool

Features
Read full description

SpoolTool is a clean and easy-to-use app for tracking your 3D printing filament en accessories. Keep an overview of your filament spools, materials and remaining weight and accessories, so you always know what you have available before starting a print. Key features: • Track filament spools and remaining weight • Support for common materials like PLA, PETG and TPU • Stock inventory • Accessory inventory • Simple and distraction-free interface • iCloud synchronization SpoolTool+ (optional in-app purchase): • Unlock additional filament materials • Unlock all accessories • Add more brands and detailed filament information • Enable cost calculation features • Configure spool stock locations SpoolTool does not require an account and does not collect personal data. App data can be stored securely using iCloud when enabled on your device. Built with focus on simplicity, privacy and ease of use.

About

Simple Hidden Note

Features
Read full description

Simple Hidden Note is a lightweight, free and offline note taking app. Simply and only made for Text note taking. By default plain text, with minimal formatting possible if required. The main feature is the hidden part. Notes are hidden by default. Creating a new note works the same as accessing an existing note: you authenticate then enter any pin. The collection of single notes will be available under that pin then. The app automatically exits hidden notes when in the background. Alternatively you can "unlock" any note collection to make it visible and accessible from the app home screen. [Features] • One text note collection per entered pin. Any pin. • Unlocking notes means usability like a simple text note editor. • Biometric authentication before pin entry. • Light and dark modes • Note collection import, export and sharing • No cost, no account, no advertising Be aware that notes are not encrypted by the app though. The app also works together with our Containd app by linking each inventory item to a pin/ note collection in Simple Hidden Note. And that note then links back to Containd App to the respective item. Just in case more text is required.

Screenshots

SpoolTool4 screens
Simple Hidden Note4 screens

Verdict

The call

The clearest difference is in-app purchases: Simple Hidden Note at none against SpoolTool's 1. Simple Hidden Note also leads on update cadence (daily vs weekly) and iOS requirement (15.1 vs 26.0). On price, ads and device support there is nothing between them.

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

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

Both are free to download. SpoolTool sells 1 one-off in-app purchase. Simple Hidden Note asks for nothing beyond the download.

UpkeepUpdate frequency

SpoolTool ships an update weekly, Simple Hidden Note daily. Both last shipped on November 5, 2026.

Scorecard3 real differences Ā· 3 level
SpoolTool versus Simple Hidden Note: the parameters behind the verdict, then further details
ParameterSpoolToolSimple Hidden Note
PriceFreeFree
Update frequencyWeeklyDaily — better
AdsNoNo
In-app purchasesYesNo — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.1 — better
Further details — not scored
Size9 MB35 MB
Age rating4+4+
DeveloperLuc JanssenNext Level Order Engineering UG (haftungsbeschrankt)

In-app purchases

1 purchases

SpoolTool

One-time1
  • SpoolTool+$1.99
None

Simple Hidden Note

No in-app purchases

Questions

Is SpoolTool free?
SpoolTool is free to download, with in-app purchases available.
Is Simple Hidden Note free?
Simple Hidden Note is free to download, with no in-app purchases.
Do SpoolTool or Simple Hidden Note have ads?
Neither SpoolTool nor Simple Hidden Note shows ads.
Which is updated more often, SpoolTool or Simple Hidden Note?
SpoolTool ships an update weekly, and Simple Hidden Note daily. Most recently, SpoolTool was updated on November 5, 2026 and Simple Hidden Note on November 5, 2026.

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