iSlipstick vs splotRF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSlipstick
This app provides a suite of essential electronic formula calculators and unit converters. It simplifies complex calculations for Ohm's law, LC circuits, impedance, and more, with a user-friendly interface for quick input and reordering of frequently used tools.
- Ohm's law calculator
- Op-Amp gain calculator
- LC circuit resonance calculator
- RLC circuit impedance calculator
- dBm to voltage/power converter
- Resistor calculator
- Unit converters (metric/imperial)
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iSlipstick is a collection of commonly used electronic formula calculators and value converters. Included: Ohm's law calculator Op-Amp gain calculator LC circuit resonate frequency calculator Impedance and phase calculator for both series and parallel RLC circuits Parallel resistance calculator for up to six resistors dBm to voltage and power calculator for 50, 75 and 600 ohm loads Convert dBV to volts, dBW to watts and dBuV to microvolts with the dB converter. This converter will also convert the respective value to dB Resistor Calculator for 4 or 5 band resistors and SMD types Time Constant calculator for R - C and R - L networks. Length, Area, Volume, Capacity and Weight converters to go to and from metric and imperial units and within the same standard. Voltage Converter RMS to Peak and Peak-to-Peak and vice-versa. Features: iSlipstick's unique keyboard makes it easy to enter values without having to jump from one keyboard mode to another Numeric input can be American or European standard Re-orderable tables allow you to put the most frequently used functions where you will find them quickly iSlipstick has been tested on iOS 12.0 thru iOS 15.1
splotRF
Visualize and analyze touchstone S-parameter data with interactive plots. Supports multiple file overlays, stability calculations, and various matrix conversions. Export data in vector graphics formats.
- Plot .snp format S-parameter data
- Stability circles and µ/µ' analysis
- Overlay multiple trace data
- View data as a table
- S/Y/Z matrix conversion
- Smith Chart, Polar, and Rectangular plots
- Export to PDF
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Key Features: • plots .snp format s-parameter touchstone data • stability circles for load and source • µ and µ' for load and source stability • interactive data markers • overlay multiple trace data on a single plot • overlay trace data from multiple files • view data as a table list • arbitrary number of ports (.s1p, .s2p, s3p…snp support) • S/Y/Z matrix conversion • mA/RI/dB formatting • interpolation over frequency • exports vector graphics to .pdf • plotting display properties and configuration are saved within file comments • automated grid layout • Smith Chart, Polar and Rectangular plots • reads and plots .zip archives containing s-parameter data
Screenshots
Verdict
The clearest difference is update cadence: splotRF at every 10 days against iSlipstick's every 3 months. iSlipstick's advantage is iOS requirement (12.0 vs 18.0). On price, rating, ratings volume and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for iSlipstick against 5.0 for splotRF. Both are backed by a comparable volume of ratings — 3 and 2 respectively.
iSlipstick ships an update every 3 months, splotRF every 10 days. The most recent releases landed on October 5, 2026 and October 13, 2026 respectively.
| Parameter | iSlipstick | splotRF |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) | 5.0 (2 ratings) |
| Positive reviews | 90.0% of reviews | — |
| Number of ratings | 3 — better | 2 |
| Update frequency | Every 3 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, Mac — better |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 36 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Sam Virgillo | DirectRF |
Customer experience
iSlipstick
splotRF
In-app purchases
iSlipstick
No in-app purchases
splotRF
No in-app purchases









