Comparison

iSlipstick RF vs KTrunk

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

Head to head
About

iSlipstick RF

This app provides a comprehensive suite of calculators and converters specifically designed for radio frequency (RF) engineers and technicians. It includes tools for path loss, antenna gain, intermodulation, and standard electrical calculations, along with various unit conversions.

Highlights
  • RF-specific calculators
  • Standard electrical calculators
  • Unit converters
  • Path loss calculation
  • Intermodulation analysis
  • Antenna gain and beamwidth
Features
Read full description

iSlipstick RF iSlipstick RF contains all of the functionality of the standard iSlipstick plus many functions specifically for RF work. RF Calculators included with iSlipstick RF are: PATH LOSS – Enter all of the RF link parameters such as transmitter output power, antenna gain, cable loss, distance and frequency to find the actual RF level at the receiver. MICROWAVE DISH BEAMWIDTH & GAIN – Enter the dish size, frequency and efficiency to find the 3 dB beamwidth and antenna gain. WAVELENGTH – Metric & U.S. RETURN LOSS / VSWR – Enter forward and reflected power to find VSWR, reflection coefficient and return loss. FRESNEL ZONE – Enter link distance, obstacle distance and frequency to find the 60% and 80% zone radii. This calculator also provides a visual display of ground clearance. VELOCITY FACTOR (VOP) – Enter the dielectric constant of a coax to find the Velocity of Propagation and enter the cable length to find the propagation delay. This calculator can also find the necessary cable length for a given delay and VOP. INTERMODULATION – Enter up to six frequencies to find the 2nd, 3rd, 5th and 7th intermod products that can be created. A 'hit' window can be set to eliminate out of band results. I.F. FREQUENCY – Enter the incoming carrier frequency and 1st local oscillator frequency to find the resulting I.F. and whether the spectrum is inverted or normal. This is a great calculator when working with up/down converters. INTERCEPT POINT – Once you have determined the levels of fundamental and intermodulation tones in a system, you can enter those values into this calculator to find either IP2 or IP3. Standard Calculators included in iSlipstick RF are: OHM'S LAW – Find voltage, current, resistance and power. REACTANCE – Find inductive and capacitive reactance by entering frequency and capacitance or inductance. RESONANCE – Find the resonant frequency of an inductor – capacitor pair. VOLTAGE DIVIDER – Enter the voltage into a resistor divider network to find the output voltage. PARALLEL RESISTOR – Enter up to six resistor values to find the resultant parallel resistance. SERIES and PARALLEL RLC – Enter R, C and L of a series or parallel circuit to find the impedance and phase angle. OP-AMP – Find the gain of either an inverting or non-inverting op-amp circuit. TIME CONSTANT - Find the first 5 time constants of both RC and RL circuits. Standard Converters included in iSlipstick RF are: RESISTOR COLOR CODE – Enter a resistor value to find the color code or enter the color code to find the resistor value. SMD RESISTOR – Enter 3 digit or 4 digit SMD codes to find the resistance value. Also does EIA-96 conversion. VOLTAGE CONVERTER – Convert between RMS, average, peak and p-p values. dB CONVERTER – Convert dBm, dBV, dBW and dBuV to absolute values and vice-versa in 50, 75 and 600 ohm load. TEMPERATURE – Convert between four popular scales. PERIOD – FREQUENCY – Convert waveform period to frequency and vice-versa. LENGTH, AREA, VOLUME, CAPACITY and WEIGHT – Convert from metric to U.S. and vice-versa. Also convert within same standard. A help page is also available as a quick function guide. Tested with iOS 12.0 thru iOS 15.1

About

KTrunk

This note-taking app allows you to save ideas with attached files and photos. You can create links between notes and files, and synchronize your data across devices. An optional in-app purchase enables note encryption for enhanced privacy.

Highlights
  • Save ideas with files and photos
  • Link notes to other notes and files
  • Synchronize across devices via iCloud
  • Notes saved in HTML format
  • Optional note encryption
Features
Read full description

Knowledge Trunk - or short KTrunk - is a note taking App. Use KTrunk to save all your ideas augmented with related files and photos. You can establish links from one note to any other note or file in KTrunk. The notes are saved in html-format and can be synchronized across your devices using iCloud. In-App-Purchases: * Privacy Allows to encrypt/decrypt your notes.

Screenshots

iSlipstick RF4 screens
KTrunk1 screens

Verdict

The call

The clearest difference is review sentiment: iSlipstick RF at 100% against KTrunk's 50%. iSlipstick RF also leads on in-app purchases (none vs 3) and iOS requirement (16.6 vs 18.0). KTrunk's advantage is update cadence (monthly vs every 10 months) and rating (5.0 vs 4.7). On price, ratings volume, 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. KTrunk sells 3 one-off in-app purchases. iSlipstick RF asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

KTrunk holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews complicate that: 100% of iSlipstick RF's written reviews are positive against 50% of KTrunk's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iSlipstick RF ships an update every 10 months, KTrunk monthly. The most recent releases landed on October 5, 2026 and October 14, 2026 respectively.

Scorecard6 real differences · 4 level
iSlipstick RF versus KTrunk: the parameters behind the verdict, then further details
ParameteriSlipstick RFKTrunk
PriceFreeFree
Rating4.7 (3 ratings)5.0 (2 ratings) — better
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings3 — better2
Update frequencyEvery 10 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhoneiPhone, iPad — better
Requires iOS16.6 — better18.0
Further details — not scored
Size43 MB10 MB
Age rating4+17+
DeveloperSam VirgilloClemens Schuetzdeller

Customer experience

iSlipstick RF

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

KTrunk

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

In-app purchases

None

iSlipstick RF

No in-app purchases

3 purchases

KTrunk

One-time3
  • Operating Convenience$0.99
  • Privacy$1.99
  • #Tag-Proposals$1.99

Questions

Is iSlipstick RF free?
iSlipstick RF is free to download, with no in-app purchases.
Is KTrunk free?
KTrunk is free to download, with in-app purchases available.
Which has better reviews, iSlipstick RF or KTrunk?
KTrunk is rated higher. iSlipstick RF averages 4.7 out of 5 from 3 ratings, while KTrunk averages 5.0 from 2 ratings.
Do iSlipstick RF or KTrunk have ads?
Neither iSlipstick RF nor KTrunk shows ads.
Which is updated more often, iSlipstick RF or KTrunk?
iSlipstick RF ships an update every 10 months, and KTrunk monthly. Most recently, iSlipstick RF was updated on October 5, 2026 and KTrunk on October 14, 2026.

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