Comparison

Universal Converter Prime vs BookmarkThis

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

Head to head
About

Universal Converter Prime

Features
Read full description

The universal converter is a smart, easy to use and precies converter between over 500 units in 21 unit sets. With advanced features, including a calculator, advanced secondary units to create composite units for specific scientific unit sets and elaborate descriptions and sources. Each unit set is configured to be intuitive to use. It is unique in learning to how deal with units that lead to confusion in daily life, such as gigabyes (GB) and gibibytes (GiB), or kilowatt-hour (kWh) and kilowatt (kW). Unit sets include Length, Area, Volume, Mass, Speed, Temperature, Energy, Power and time, Battery capacity, Angle, Frequency (and wavelength), Musical transposition between instruments, Numbers, Percent, Fractions, Time since, Time until, Time between and Currency, Pressure, and Bits and bytes. More unit sets are coming. For each of these, a large variety of units are included. Units are shown abbreviated as well as written out, so it is easy to learn what the units refer to. The app is customizable to accommodate various preferences: in favorite units, and in how the units and values are displayed. Select a unit category to convert any combination of units within the category. You can select one of the favorite units on the top of the screen or double tap on any result cell to convert from that particular unit to all others. The values entered are converted to all the units available in this unit set and favorite units are shown on top of the list. You can use the number pad to change what value to convert. For many unit sets you can use this as a calculator: the equation in the calculator is evaluated in the background and the result is converted to all units available. Copying results: long-press the result row that you would like to copy. A box opens to copy the results to the clipboard. For the time-related unit sets, a single tap is sufficient because of the update in the numbers occurring every second. Adding favorites: by long-pressing on one of result cells, you can add the respective unit to your favorites. Removing favorites: by long-pressing on one of result cells or on the unit in the top of the screen, you can remove the respective unit from your favorites.

About

BookmarkThis

Features
Read full description

Transform how you save and organize digital content with BookmarkThis, the intelligent bookmark manager designed for the modern iOS user. UNIVERSAL CONTENT CAPTURE • Save from any app using iOS Share Sheet - no switching required • Intelligent metadata extraction with thumbnails, titles, and descriptions • Support for Threads, YouTube, TikTok, X (Twitter), LinkedIn, Instagram, Facebook, and all websites SMART ORGANIZATION SYSTEM • Custom categories with emoji icons and theme-based colors • Drag-and-drop category reordering for personalized workflows • Advanced tag system for flexible content organization • Search across titles, descriptions, tags, and metadata SEAMLESS INTEGRATION • Native iOS Share Sheet integration across all apps • Real-time sync between main app and Share Extension EFFICIENT WORKFLOW • One-tap bookmarking from any app • Instant access to organized content library • Platform-specific metadata for richer context • Archive system for temporary content • Bulk operations for efficient management Terms of Use: https://peterong.sg/bookmarkthis-terms-of-use/

Screenshots

Universal Converter Prime4 screens
BookmarkThis4 screens

Verdict

The call

The clearest difference is in-app purchases: Universal Converter Prime at none against BookmarkThis's 3. Universal Converter Prime also leads on update cadence (daily vs every 2 weeks) and iOS requirement (15.0 vs 18.0). BookmarkThis's advantage is ads (none vs shown). On price 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. BookmarkThis sells 3 in-app purchases, starting at $2.99 per month. Universal Converter Prime asks for nothing beyond the download.

UpkeepUpdate frequency

Universal Converter Prime ships an update daily, BookmarkThis every 2 weeks. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

Scorecard4 real differences · 2 level
Universal Converter Prime versus BookmarkThis: the parameters behind the verdict, then further details
ParameterUniversal Converter PrimeBookmarkThis
PriceFreeFree
Update frequencyDaily — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesNo — betterYes
DevicesiPhone, iPod — betteriPhone
Requires iOS15.0 — better18.0
Further details — not scored
Size4 MB22 MB
Age rating4+4+
DeveloperEmile ChappinPeter Ong

In-app purchases

None

Universal Converter Prime

No in-app purchases

3 purchases

BookmarkThis

Subscriptions2
  • BookmarkThis$2.991 Month
  • BookmarkThis$9.991 Year
One-time1
  • BookmarkThis$9.99

Questions

Is Universal Converter Prime free?
Universal Converter Prime is free to download, with no in-app purchases.
Is BookmarkThis free?
BookmarkThis is free to download, with in-app purchases available.
Do Universal Converter Prime or BookmarkThis have ads?
Universal Converter Prime shows ads; BookmarkThis does not.
Which is updated more often, Universal Converter Prime or BookmarkThis?
Universal Converter Prime ships an update daily, and BookmarkThis every 2 weeks. Most recently, Universal Converter Prime was updated on November 4, 2026 and BookmarkThis on October 30, 2026.

Other comparisons