Comparison

Universal Converter Prime vs SPEKTR

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
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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

SPEKTR

Streamline foundation inspections with a guided process for identifying products and recording specifications. Upload images directly into your reports for comprehensive documentation. Designed for efficiency and accuracy in the field.

Highlights
  • Step-by-step inspection process
  • Foundation product identification
  • Record quantity, load, depth, pressure
  • Upload product images
  • Generate inspection reports
Features
Read full description

SPEKTR was developed by foundation engineers for foundation inspectors. We know how important it is to maintain the accuracy of inspection reports while maximizing efficiency. The SPEKTR app provides a simple step-by-step process that leads users through identifying foundation products, selecting the appropriate specs such as quantity, load, depth, pressure, and more. Images of the product can be uploaded and submitted as part of the final inspection report. It’s that easy!

Screenshots

Universal Converter Prime4 screens
SPEKTR2 screens

Verdict

The call

The clearest difference is ads: SPEKTR at none against Universal Converter Prime's shown. Universal Converter Prime's advantage is update cadence (daily vs every 3 weeks). On price, in-app purchases, 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

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

UpkeepUpdate frequency

Universal Converter Prime ships an update daily, SPEKTR every 3 weeks. The most recent releases landed on October 25, 2026 and October 27, 2026 respectively.

Scorecard2 real differences · 8 level
Universal Converter Prime versus SPEKTR: the parameters behind the verdict, then further details
ParameterUniversal Converter PrimeSPEKTR
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyDaily — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesNoNo
Monetization—Ad-supported
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.0 — better15.6
Further details — not scored
Size4 MB37 MB
Age rating4+4+
DeveloperEmile ChappinStark Innovative LLC

In-app purchases

None

Universal Converter Prime

No in-app purchases

None

SPEKTR

No in-app purchases

Questions

Is Universal Converter Prime free?
Universal Converter Prime is free to download, with no in-app purchases.
Is SPEKTR free?
SPEKTR is free to download, with no in-app purchases.
Do Universal Converter Prime or SPEKTR have ads?
Universal Converter Prime shows ads; SPEKTR does not.
Which is updated more often, Universal Converter Prime or SPEKTR?
Universal Converter Prime ships an update daily, and SPEKTR every 3 weeks. Most recently, Universal Converter Prime was updated on October 25, 2026 and SPEKTR on October 27, 2026.

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