Comparison

iSignatureSuite 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

iSignatureSuite

Features
Read full description

iSignatureSuite - The free app for capturing signatures on the iPad or iPhone This product is a stand-alone, free signature app and does not require any additional third-party software (such as Adobe Acrobat). However, this signature capturing app is also available to integrators as a component for their own apps. It is necessary to have an account with a webSignatureOffice server (www.webSignatureOffice.com) in order to run iSignatureSuite. Input: • PDF/A documents created by the customer (via webSignatureOffice server) • It is also possible for the above PDF documents to have customer-defined signature fields • It is also possible for the above PDF documents to have customer-created form fields Output: • When the outgoing document is PDF/A compliant, the document remains PDF/A compliant after signing • ISO-compliant PDF signatures - can be checked using all standard products (e.g. Adobe Reader) and enables interoperability with other signature processes and programmes which conform with the standards • Capture a handwritten electronic signature using an iPad Ability to customise / integrate: • Can also be fully integrated into customer apps as a component Ease of use and user-friendliness: • Sign directly in the document (no separate signature window) • Preview of the selected PDFs • Allows browsing, zooming and continuous scrolling of PDF documents • Filling out of PDF form fields and supports check boxes, radio buttons and drop-down menus • Clear document management with status tracking, automatic reminder (for all signatories) Automation: • Template management (saving documents for re-use, including signature templates) • Intelligent signature templates (e.g. automated positioning of signature fields, even for dynamic documents, e.g. using key words) • Jumps automatically to the signature fields during the signing process and zooms in if necessary • Handles compulsory and optional signature fields differently (stop at compulsory field = stop the whole signing process) Security: • Supports encryption on the iPad using biometric data with RSA 2048 Bit • Delayed signing is possible at any time without compromising safety • Form fields automatically locked once signed • Signatures provided can easily be checked (using Adobe Acrobat Reader) • Secure communication over https By using the Apple Pencil and iSignatureSuite, you can now detect the pressure distribution of your signature, and your typeface is also detected more clearly. The Apple Pencil is currently only compatible with the iPad Pro.

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

iSignatureSuite3 screens
RF toolbox4 screens

Verdict

The call

The clearest difference is in-app purchases: iSignatureSuite at none against RF toolbox's 1. RF toolbox's advantage is iOS requirement (13.0 vs 15.6). 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. iSignatureSuite asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on September 17, 2026 and September 9, 2026 respectively.

Scorecard2 real differences · 4 level
iSignatureSuite versus RF toolbox: the parameters behind the verdict, then further details
ParameteriSignatureSuiteRF toolbox
PriceFreeFree
Update frequencyEvery 6 monthsEvery 6 months
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size13 MB28 MB
Age rating4+4+
DeveloperStepOver International GmbHAnas Abubakar

In-app purchases

None

iSignatureSuite

No in-app purchases

1 purchases

RF toolbox

One-time1
  • upgrade to pro$3.99

Questions

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

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