# RF calculator & Smith Chart — VSWR & Impedance Matching > VSWR & Impedance Matching (iPhone/iPad app by Anas Abubakar.) - Source: https://appshunter.io/ios/app/rf-calculator-and-smith-chart/id6757265018 (this page in markdown: same URL + `.md`) - Developer: [Anas Abubakar](https://appshunter.io/developer/1581534101) - Category: Productivity, Education - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 15.0 · 31 MB - Languages: American English, French (France), German (Germany), Japanese, Russian, Chinese (Simplified, China) - Released: 2026-01-18 - Data updated: 2026-10-13 - User reviews in markdown: https://appshunter.io/ios/app/rf-calculator-and-smith-chart/id6757265018/reviews.md ## What is RF calculator & Smith Chart? RF Calculator & Smith Chart is an all-in-one RF engineering toolkit for impedance matching, RF network analysis, antenna calculations, filters, attenuators and wireless system design. Built for RF engineers, electronics engineers, students, technicians and radio enthusiasts, it brings essential RF calculations and design tools together in one convenient app. Analyze impedance, work with Smith Charts, calculate VSWR and S11, design matching networks, estimate path loss, build RF attenuators and evaluate wireless links without jumping between multiple tools. RF & IMPEDANCE TOOLS • Smith Chart for impedance visualization and matching • S11 and reflection analysis • Reflection coefficient calculator • VSWR calculator • Impedance and transmission-line calculations • Cascaded RF network calculations IMPEDANCE MATCHING Design and analyze common RF matching networks: • L matching networks • Pi (π) matching networks • T matching networks • Stub tuner calculations Useful for antenna matching, RF amplifiers, transmission lines and other impedance-matching applications. RF FILTER DESIGN Calculate and design common passive and RF filters: • RC filters • RL filters • RLC networks • Butterworth LC low-pass filters • Chebyshev LC low-pass filters • Filter designs up to 8th order • Microstrip band-pass filters • Microstrip band-reject / notch filters RLC CIRCUITS Analyze frequency-dependent RLC networks: • Series RLC circuits • Parallel RLC circuits • Resonant frequency calculations • Frequency behavior and reactance RF ATTENUATOR DESIGN Quickly calculate standard RF attenuator networks: • Pi (π) attenuator • T attenuator • Bridged-T attenuator Ideal for RF signal-level control, impedance-matched pads and test setups. ANTENNA & PROPAGATION TOOLS Plan and evaluate RF and wireless systems with: • Antenna design utilities • Free-space path loss calculations • Friis transmission calculations • RF link budget calculator • Power density calculator • Radar maximum-range calculator COMPONENT DESIGN & REFERENCE Useful electronics tools are also included for RF design and prototyping: • Air-core inductor design • Spiral inductor design • Multi-layer air-core inductor calculations • SMD resistor code • Resistor color code • Resistors in series and parallel • SMD capacitor code • Capacitors in series and parallel BUILT FOR PRACTICAL RF WORK RF Calculator & Smith Chart is designed for quick engineering workflows. Select a tool, enter your parameters and get the values you need without working through repetitive equations manually. Use it for: • RF circuit design • Impedance matching • Antenna projects • Wireless link planning • Filter design • RF testing and troubleshooting • Electronics laboratories • Engineering study and coursework • Amateur radio and RF experimentation Whether you're checking VSWR, designing an impedance-matching network, calculating a link budget or experimenting with RF filters, RF Calculator & Smith Chart keeps essential RF engineering tools within easy reach. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | upgrade to pro | $3.99 | one-time | ## Version history (last 3 releases) ### 2 — 2026-09-29 enhanced RF matching, S11 calculations and improved the UI ### 1.1 — 2026-07-24 improved the user interface, few bugs fixed ### 1.0 — 2026-01-18 No release notes. ## Apps similar to RF calculator & Smith Chart | App | Rating | Price | Category | | --- | --- | --- | --- | | [splotRF](https://appshunter.io/ios/app/splotrf/id1599892560) | 5.0 (2) | Free | Productivity | | [Electronics Engineer Helper](https://appshunter.io/ios/app/electronics-engineer-helper/id896429646) | 4.8 (436) | Free | Productivity | | [World Radio League](https://appshunter.io/ios/app/world-radio-league/id6502666646) | 4.5 (65) | Free | Productivity | | [Electrical Calculations](https://appshunter.io/ios/app/electrical-calculations/id993232048) | 4.6 (126) | Free | Productivity | | [iNet - Network Scanner](https://appshunter.io/ios/app/inet-network-scanner/id340793353) | 4.5 (2,540) | Free | Productivity | | [Network Toolbox Net security](https://appshunter.io/ios/app/network-toolbox-net-security/id651691453) | 4.6 (3,303) | Free | Productivity | ## More apps by Anas Abubakar - [Electronics Tools & Calc Pro](https://appshunter.io/ios/app/electronics-tools-and-calc-pro/id1581668963) - [Electronics Tools & Calculator](https://appshunter.io/ios/app/electronics-tools-and-calculator/id1581885136) - [Electronics Circuit Calc Pro](https://appshunter.io/ios/app/electronics-circuit-calc-pro/id1583600520) - [Electronic Circuit Calculator](https://appshunter.io/ios/app/electronic-circuit-calculator/id1583972990) - [Fisika - Physics app](https://appshunter.io/ios/app/fisika-physics-app/id1586848633) - [PhysicsLab - Calculator lite](https://appshunter.io/ios/app/physicslab-calculator-lite/id1587705682) All apps by Anas Abubakar: https://appshunter.io/developer/1581534101 ## Related topics [smith charts](https://appshunter.io/ios/topics/smith-charts) · [2.4g rf](https://appshunter.io/ios/topics/2-4g-rf) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-13.*