Comparison

iStepOverSigner vs RF toolbox

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

Head to head
About

iStepOverSigner

Features
Read full description

Use your iPad or iPhone to capture signatures In conjunction with the signature software eSignatureSuite*, iPhones or iPads are easy to use as signature capture devices. To sign electronic documents, you will need the free iStepOverSigner app on your iPhone or iPad. When signing your electronic signature will be captured by the signature app. Both typeface and biometric data (time elapsed) will be stored in excellent quality**. *Including Hardware API, Software API and EasySigner **The maximum temporal and local resolution are preset by your smartphone hardware. Further information and data available on request. *** Features *** Signing documents The signature is captured as precisely as possible via your iPhone or iPad, inseparably linked with the document and transferred to the signature software eSignatureSuite, which then links your typeface and highly encrypted biometric data with the document Secure signature The biometric signature data is securely encrypted in the iPhone or iPad and linked to the document in such a way that it cannot be misused with another document. A public RSA key (4096 bit) ensures that the biometric data cannot be decrypted without accessing the relevant private RSA key. However, this is stored with a notary, who has also generated the key pair. In case of doubt, only this process enables the operator to prove that he himself was unable to decrypt the biometric data and misuse it in different or changed documents. In addition, every signature is provided with a digital signature by the software so that each recipient can check the integrity of the document e.g. with the aid of Adobe Reader.

About

RF toolbox

Features
Read full description

RF Toolbox — 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 • Smith Chart utilities for impedance visualization and matching workflows • S11 parameter / reflection analysis support • Reflection coefficient and VSWR calculators Matching Networks • L, Pi (π), and T matching network calculators • Stub tuner tools for transmission-line matching • Filters (Passive & RF) • RC and RL passive filter calculators • LC low-pass prototypes: Butterworth and Chebyshev (up to 8th order) • Microstrip filters: band-pass and band-reject (notch) • RLC Networks • RLC series and parallel calculators for resonance and frequency behavior Attenuators • Pi (π), T, and Bridge-T attenuator calculators for common RF pad designs • Cascaded Networks • Cascaded network calculations for chained RF blocks and stages Antenna & Propagation • Antenna design utilities (core RF design helpers) • Path loss calculators • Friis link budget calculator • Power density calculator • Radar maximum range calculator Component Toolkits • Inductor design: air-core, spiral, and multi-layer air-core • Resistors: SMD code, color code, and series/parallel network calculator • Capacitors: SMD code and series/parallel network calculator DESIGNED FOR SPEED AND ACCURACY RF Toolbox is organized for quick access—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

iStepOverSigner2 screens
RF toolbox4 screens

Verdict

The call

The clearest difference is in-app purchases: iStepOverSigner at none against RF toolbox's 1. iStepOverSigner also leads on iOS requirement (11.0 vs 13.0). On price, update cadence, 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. RF toolbox sells 1 one-off in-app purchase. iStepOverSigner asks for nothing beyond the download.

UpkeepUpdate frequency

iStepOverSigner ships an update every 10 months, RF toolbox every 6 months. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

Scorecard2 real differences · 4 level
iStepOverSigner versus RF toolbox: the parameters behind the verdict, then further details
ParameteriStepOverSignerRF toolbox
PriceFreeFree
Update frequencyEvery 10 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS11.0 — better13.0
Further details — not scored
Size12 MB28 MB
Age rating4+4+
DeveloperStepOver International GmbHAnas Abubakar

In-app purchases

None

iStepOverSigner

No in-app purchases

1 purchases

RF toolbox

One-time1
  • upgrade to pro$3.99

Questions

Is iStepOverSigner free?
iStepOverSigner 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 iStepOverSigner or RF toolbox have ads?
Neither iStepOverSigner nor RF toolbox shows ads.
Which is updated more often, iStepOverSigner or RF toolbox?
iStepOverSigner ships an update every 10 months, and RF toolbox every 6 months. Most recently, iStepOverSigner was updated on September 17, 2026 and RF toolbox on September 9, 2026.

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