Comparison

Lock Notes Pro vs LFunCalc

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

Head to head
About

Lock Notes Pro

Securely store and protect your private notes with password or Touch ID access. This app allows you to keep sensitive information like passwords, secrets, and diaries safe from unauthorized viewing. It offers features like iCloud backup and syncing, image insertion, and printing.

Highlights
  • Password and Touch ID protection
  • iCloud backup and sync
  • Insert images and photos
  • Print notes
  • Sort and customize notes
  • Security question recovery
Features
Read full description

A SINGLE PURCHASE COVERS ALL YOUR IPHONE AND IPAD DEVICES. FINALLY AN APP FOR ALL YOUR PRIVATE NOTES! Keep your most valuable, private, and secret notes away from prying eyes. Keep them all totally secret and safe. Store passwords, secrets, contacts or just keep your diary private. KEY FEATURES: • Use Touch ID or passcode to safely lock access to your private notes. • Set a security question and answer in case you forget your passcode. • Safely Backup your valuable notes to iCloud. • Quickly Sync notes between iPhone & iPad with iCloud. • Sort notes list by name, date or manual. • Select notes font style and size. • Insert images & photos into notes. • Print your notes. • Send notes via text message or email. • Save notes to Camera Roll. • Support for Emoji Emoticons. Terms of use: http://www.katans.com/terms-of-use Privacy policy: http://www.katans.com/privacy-policy

About

LFunCalc

Features
Read full description

LFunCalc is a function calculator that formulas are displayed and entered as a list. Just after a formula is entered, the result is displayed without tapping enter key. A formula name is assigned to each input line and can be referenced as a variable in the following formulas. When a formula is changed, the value of the other formula referencing it is updated too. LFunCalc is also useful as a tool of parameter study. Note) LFunCalc is not a spreadsheet application.

Screenshots

Lock Notes Pro4 screens
LFunCalc4 screens

Verdict

The call

The clearest difference is price: LFunCalc at Free against Lock Notes Pro's $9.99. LFunCalc also leads on in-app purchases (none vs 1). Lock Notes Pro's advantage is update cadence (every 2 weeks vs every 5 months). On ads, device support and iOS requirement 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

LFunCalc is free to download; Lock Notes Pro costs $9.99 up front. Lock Notes Pro sells 1 in-app purchase, starting at $14.99 per year. LFunCalc asks for nothing beyond the download.

UpkeepUpdate frequency

Lock Notes Pro ships an update every 2 weeks, LFunCalc every 5 months. The most recent releases landed on October 12, 2026 and September 28, 2026 respectively.

Scorecard3 real differences · 7 level
Lock Notes Pro versus LFunCalc: the parameters behind the verdict, then further details
ParameterLock Notes ProLFunCalc
Price$9.99Free — better
Rating4.6 (270 ratings) — better—
Positive reviews82.3% of reviews—
Number of ratings270 — better—
Update frequencyEvery 2 weeks — betterEvery 5 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better13.2
Further details — not scored
Size8 MB46 MB
Age rating4+4+
DeveloperJulyApps LtdNOBORU IMAI

Bugs and requests

Lock Notes Pro

Reported bugs

3 issues
  • Crashes after iOS updates
  • Unable to edit or update notes without losing data
  • Syncing issues between devices

Requested features

4 requests
  • Add checklist functionality
  • Implement a recycle bin for deleted notes
  • Improve syncing and backup options
  • Add more customization options for font, layout, etc.

LFunCalc

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Lock Notes Pro

Subscriptions1
  • Auto Backup$14.991 Year
None

LFunCalc

No in-app purchases

Questions

Is Lock Notes Pro free?
Lock Notes Pro costs $9.99, and also offers in-app purchases.
Is LFunCalc free?
LFunCalc is free to download, with no in-app purchases.
Do Lock Notes Pro or LFunCalc have ads?
Neither Lock Notes Pro nor LFunCalc shows ads.
Which is updated more often, Lock Notes Pro or LFunCalc?
Lock Notes Pro ships an update every 2 weeks, and LFunCalc every 5 months. Most recently, Lock Notes Pro was updated on October 12, 2026 and LFunCalc on September 28, 2026.

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