Comparison

iSlipstick RF vs iSmith

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

iSmith

This app helps users understand impedance matching principles. It allows for reading key network parameters from a Smith chart and calculating various matching networks and pads. Users can also convert between different power and voltage units.

Highlights
  • Read Smith chart parameters (Z, Y, VSWR, Q, Gamma)
  • Calculate 8 L-matching networks
  • Calculate T & Pi matching pads
  • Set matching targets on Smith chart
  • Learn impedance matching principles
  • dBm, Watts, and Volts conversion
  • VSWR conversion
Features
Read full description

Features: - Read out Z, Y, VSWR, Q and Gamma from smith chart. - Calculate 8 L-matching networks. - Set matching target by touching smith chart. - Calculate T & Pi matching pad. - Learn the principle of impedance matching. - dBm, Watts and Volts conversion - VSWR Conversion

Screenshots

iSlipstick RF4 screens
iSmith4 screens

Verdict

The call

The clearest difference is ads: iSlipstick RF at none against iSmith's shown. iSlipstick RF also leads on monetization model (free vs ad-supported) and ratings volume (3 vs 1). iSmith's advantage is update cadence (every 2 days vs every 10 months) and rating (5.0 vs 4.7). 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.

ReceptionRating · Positive reviews · Number of ratings

iSmith holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

UpkeepUpdate frequency

iSlipstick RF ships an update every 10 months, iSmith every 2 days. The most recent releases landed on September 17, 2026 and June 6, 2026 respectively.

Scorecard5 real differences · 5 level
iSlipstick RF versus iSmith: the parameters behind the verdict, then further details
ParameteriSlipstick RFiSmith
PriceFreeFree
Rating4.7 (3 ratings)5.0 (1 ratings) — better
Positive reviews100.0% of reviews—
Number of ratings3 — better1
Update frequencyEvery 10 monthsEvery 2 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree — betterAd-supported
DevicesiPhoneiPhone, iPad — better
Requires iOS16.616.0 — better
Further details — not scored
Size43 MB7 MB
Age rating4+4+
DeveloperSam VirgilloRyoun Chon Shin

Customer experience

iSlipstick RF

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

iSmith

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

iSlipstick RF

No in-app purchases

None

iSmith

No in-app purchases

Questions

Is iSlipstick RF free?
iSlipstick RF is free to download, with no in-app purchases.
Is iSmith free?
iSmith is free to download, with no in-app purchases.
Which has better reviews, iSlipstick RF or iSmith?
iSmith is rated higher. iSlipstick RF averages 4.7 out of 5 from 3 ratings, while iSmith averages 5.0 from 1 ratings.
Do iSlipstick RF or iSmith have ads?
iSmith shows ads; iSlipstick RF does not.
Which is updated more often, iSlipstick RF or iSmith?
iSlipstick RF ships an update every 10 months, and iSmith every 2 days. Most recently, iSlipstick RF was updated on September 17, 2026 and iSmith on June 6, 2026.

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