Comparison

i vs RF toolbox

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

Head to head
About

i

Features
Read full description

Get a vibration analysis of your vibration machine in a few seconds. The i-STEP Vibrosense App is only compatible with the i-STEP Vibrosense sensor.

About

RF toolbox

Features
Read full description

RF Toolbox β€” All-in-One RF Engineering Calculator & Design Suite RF Toolbox is a practical, field-ready app built for RF engineers, students, and radio hobbyists who need fast, reliable calculations and design utilities in one place. From impedance matching and transmission line work to filter and attenuator synthesis, RF Toolbox helps you move from idea to implementation with less friction. KEY FEATURES Impedance & S-Parameter Tools β€’ Smith Chart utilities for impedance visualization and matching workflows β€’ S11 parameter / reflection analysis support β€’ Reflection coefficient and VSWR calculators Matching Networks β€’ L, Pi (Ο€), and T matching network calculators β€’ Stub tuner tools for transmission-line matching β€’ Filters (Passive & RF) β€’ RC and RL passive filter calculators β€’ LC low-pass prototypes: Butterworth and Chebyshev (up to 8th order) β€’ Microstrip filters: band-pass and band-reject (notch) β€’ RLC Networks β€’ RLC series and parallel calculators for resonance and frequency behavior Attenuators β€’ Pi (Ο€), T, and Bridge-T attenuator calculators for common RF pad designs β€’ Cascaded Networks β€’ Cascaded network calculations for chained RF blocks and stages Antenna & Propagation β€’ Antenna design utilities (core RF design helpers) β€’ Path loss calculators β€’ Friis link budget calculator β€’ Power density calculator β€’ Radar maximum range calculator Component Toolkits β€’ Inductor design: air-core, spiral, and multi-layer air-core β€’ Resistors: SMD code, color code, and series/parallel network calculator β€’ Capacitors: SMD code and series/parallel network calculator DESIGNED FOR SPEED AND ACCURACY RF Toolbox is organized for quick accessβ€”open the tool you need, enter values, and get results immediately. Whether you’re prototyping a matching network, checking VSWR, sizing an attenuator, or running a quick link budget, RF Toolbox keeps your workflow efficient. Download RF Toolbox and keep essential RF design tools in your pocket.

Screenshots

i4 screens
RF toolbox4 screens

Verdict

The call

The clearest difference is in-app purchases: i at none against RF toolbox's 1. i also leads on update cadence (every 5 weeks vs every 6 months). RF toolbox's advantage is iOS requirement (13.0 vs 17.6). On price, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. RF toolbox sells 1 one-off in-app purchase. i asks for nothing beyond the download.

UpkeepUpdate frequency

i ships an update every 5 weeks, RF toolbox every 6 months. The most recent releases landed on September 16, 2026 and September 9, 2026 respectively.

Scorecard3 real differences Β· 3 level
i versus RF toolbox: the parameters behind the verdict, then further details
ParameteriRF toolbox
PriceFreeFree
Update frequencyEvery 5 weeks β€” betterEvery 6 months
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPadiPhone, iPad, iPod β€” better
Requires iOS17.613.0 β€” better
Further details β€” not scored
Size38 MB28 MB
Age rating4+4+
DeveloperIFE Aufbereitungstechnik GmbHAnas Abubakar

In-app purchases

None

i

No in-app purchases

1 purchases

RF toolbox

One-time1
  • upgrade to pro$3.99

Questions

Is i free?
i is free to download, with no in-app purchases.
Is RF toolbox free?
RF toolbox is free to download, with in-app purchases available.
Do i or RF toolbox have ads?
Neither i nor RF toolbox shows ads.
Which is updated more often, i or RF toolbox?
i ships an update every 5 weeks, and RF toolbox every 6 months. Most recently, i was updated on September 16, 2026 and RF toolbox on September 9, 2026.

Other comparisons