Comparison

Letter Manager vs Universal Security Instruments

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

Head to head
About

Letter Manager

Effortlessly write, format, and send letters with customizable templates. Scan and digitize incoming mail for easy organization and retrieval. Supports attachments and mail merges.

Highlights
  • Automatic DIN standard formatting
  • Save personalized letter templates
  • Attach PDF documents and images
  • Scan and digitize incoming letters
  • Keyword search for scanned text
  • Mail merge functionality
  • Export as PDF for email or print
Features
Read full description

Write formal letters without formatting them. Pick a recipient, type your text, done: Letter Manager lays out your letter to the DIN 5008 business letter standard and turns it into a PDF you can print or send. For iPhone, iPad and Mac. WRITE • Tap “New Letter” and start typing – address field, information block, subject line and fold marks are placed correctly for you. • DIN 5008 form A and form B, made to fit window envelopes. • Set up your sender details, signature, logo, letterhead and font once and reuse them for every letter.* • Emphasise text: bold, italic, underline, font size and more.* • Templates for the letters you write again and again. SEND • Share your letter as a PDF by email or print it straight from the app. • Attach PDF documents and images.* • Mail merge: create a contact group and choose it as the recipient. • Print the matching envelope as well. ORGANISE • File letters in your own folders and mark important folders as favourites. • Scan incoming mail with the camera. Text recognition captures every word.* • Search by sender, recipient, subject or the full text. ACCESSIBILITY Supports VoiceOver, Dynamic Type and Dark Mode. * Part of the full version. The full version can be shared with Family Sharing.

About

Universal Security Instruments

Manage and control your smart security and environmental devices remotely. This app offers a central hub for all your connected products, allowing for easy setup, monitoring, and sharing of device access with others.

Highlights
  • Remote device management
  • Monitor devices globally
  • Share device access
  • Simple and secure setup
  • Centralized hub for USI products
Features
Read full description

Universal Security Instruments Control and manage your USI Smart devices from anywhere with this helpful app. Whether you are securing your home or managing your environment, our app provides a central hub for all your USI security and smart products. • Remote Management: Control and monitor your devices from anywhere in the world. • Seamless Sharing: Easily share device access among family members and friends to keep everyone connected and secure. • Simple & Secure Setup: Quickly and securely connect your new devices to your home network to get started in minutes.

Screenshots

Letter Manager4 screens
Universal Security Instruments4 screens

Verdict

The call

The clearest difference is in-app purchases: Universal Security Instruments at none against Letter Manager's 4. Universal Security Instruments also leads on rating (5.0 vs 4.6) and iOS requirement (14.0 vs 17.6). Letter Manager's advantage is ratings volume (19 vs 1) and update cadence (monthly vs every 2 months). On price, ads and device support 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. Letter Manager sells 4 one-off in-app purchases. Universal Security Instruments asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Universal Security Instruments holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Letter Manager has 19 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Letter Manager ships an update monthly, Universal Security Instruments every 2 months. The most recent releases landed on October 27, 2026 and October 16, 2026 respectively.

Scorecard6 real differences · 4 level
Letter Manager versus Universal Security Instruments: the parameters behind the verdict, then further details
ParameterLetter ManagerUniversal Security Instruments
PriceFreeFree
Rating4.6 (19 ratings)5.0 (1 ratings) — better
Positive reviews86.4% of reviews—
Number of ratings19 — better1
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.614.0 — better
Further details — not scored
Size31 MB200 MB
Age rating4+12+
DeveloperFelix ReimannFeit Electric

In-app purchases

4 purchases

Letter Manager

One-time4
  • Fullversion Birthday Edition$2.99
  • Fullversion with voucher$3.99
  • Fullversion$5.99
Show 1 more
  • Fullversion for Dealers$5.99
None

Universal Security Instruments

No in-app purchases

Questions

Is Letter Manager free?
Letter Manager is free to download, with in-app purchases available.
Is Universal Security Instruments free?
Universal Security Instruments is free to download, with no in-app purchases.
Which has better reviews, Letter Manager or Universal Security Instruments?
Universal Security Instruments is rated higher. Letter Manager averages 4.6 out of 5 from 19 ratings, while Universal Security Instruments averages 5.0 from 1 ratings.
Do Letter Manager or Universal Security Instruments have ads?
Neither Letter Manager nor Universal Security Instruments shows ads.
Which is updated more often, Letter Manager or Universal Security Instruments?
Letter Manager ships an update monthly, and Universal Security Instruments every 2 months. Most recently, Letter Manager was updated on October 27, 2026 and Universal Security Instruments on October 16, 2026.

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