CircuitSense vs CoronaSDR
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CircuitSense
This app automates complex electrical calculations for electricians, including conduit sizing, conductor ampacity, and voltage drop, based on the 2026 NEC. It provides detailed explanations for each result and organizes calculations by project for easy access and professional output sharing.
- Automated conduit and conductor sizing
- Voltage drop and derating calculations
- Box fill and pull box sizing
- Load calculations for various building types
- Fault current and transformer sizing
- Conduit bending and panel phasing tools
- Offline functionality
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CircuitSense is the field calculator built for electricians who'd rather pull wire than dig through code books. Enter your circuits once and it sizes conduit, conductors, and grounds to the 2026 NEC — handling voltage drop, derating, and box fill automatically, with the math shown so you can trust every number. PLAN YOUR CONDUIT Build a complete run from a single input. CircuitSense balances circuits across conduits, picks the optimal raceway size, applies ambient and conductor-count derating, upsizes for voltage drop, and segments the run at every J-box / pull point. You get a full pull schedule with per-conduit fill percentages — before and after each box. EVERY NUMBER, EXPLAINED No black boxes. Each result shows the calculation steps, the NEC section behind it, and an upsize history so you can see exactly why a conductor went from #12 to #8. Perfect for inspections, plan review, or just double-checking your gut. A FULL NEC TOOLKIT Conductor sizing & voltage drop — ampacity, derating, and VD in one flow Conduit fill — by conductor count and type Box fill — NEC 314.16 volume by AWG and device Pull box sizing — 314.28 straight, angle/U, and splice Load calculations — dwellings, multi-family, and offices Fault current — available fault-current estimates Transformer sizing — kVA, amps, and OCPD suggestions Conduit bending — stub-90, offset, 3- and 4-point saddle Panel phasing — see circuit phases by slot (12/24/42) Construction calculator — feet/inches and tape-measure fractions Concrete & trench — slab, footing, trench/backfill, and duct bank ORGANIZED BY PROJECT Group runs under jobs, track which are complete, and reopen any run to tweak and recalculate. Your work is saved on-device and ready when you're back on site. SHARE PROFESSIONAL OUTPUT Export any run as a clean, detailed PDF — conduit schedule, fill, derating, and EGC sizing all included. Hand it to an inspector, a GC, or your own crew. BUILT FOR THE FIELD 2026 NEC referenced throughout Works offline — no signal required in the basement or the bucket Fast, single-input workflow designed for gloves and daylight Copper or aluminum, EMT and more Whether you're roughing in a panel, planning a duct bank, or checking voltage drop on a long run, CircuitSense does the code math so you can keep moving. Download CircuitSense and size it right the first time. — CircuitSense is a calculation aid for licensed electricians and qualified persons. Always verify results against the adopted code and your local authority having jurisdiction (AHJ). It does not replace engineered design or professional judgment. Terms of Use (EULA): https://circuitsense.app/terms-of-service Privacy Policy: https://circuitsense.app/privacy-policy
CoronaSDR
This application allows users to connect to and control RTL-SDR servers on their local network. It provides live spectrum and waterfall displays, various demodulation modes, and DSP controls for audio filtering and signal tuning. Users can save favorite stations and adjust RF settings.
- Live spectrum and waterfall display
- Multiple demodulation modes (AM, NFM, WFM, USB, LSB, CW)
- DSP controls (squelch, AGC, filters)
- Station favorites with import/export
- RF controls (PPM, tuner options)
- Diagnostics and performance pipeline
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CoronaSDR is an iOS app for listening to rtl_tcp SDR servers over your local network. Key features: - Live spectrum and waterfall rendering - Demodulation modes: AM, NFM, WFM, USB, LSB, CW - DSP controls: squelch, AGC, audio filters, de-emphasis - Station favorites with import/export - RF controls such as PPM and tuner options (hardware/server dependent) - Diagnostics and a performance-focused pipeline No account is required. Set your rtl_tcp host and port, connect, and tune. Built by Silviu YO6SAY for the radio community.
Screenshots
Verdict
The clearest difference is in-app purchases: CoronaSDR at none against CircuitSense's 2. CoronaSDR also leads on ratings volume (10 vs 2). CircuitSense's advantage is update cadence (every 3 days vs every 9 days) and iOS requirement (13.0 vs 18.0). On price, rating, review sentiment 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. CircuitSense sells 2 in-app purchases, starting at $9.99 per month. CoronaSDR asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for CircuitSense against 5.0 for CoronaSDR. That said, the two scores are not equally well evidenced: CoronaSDR has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.
CircuitSense ships an update every 3 days, CoronaSDR every 9 days. Both last shipped on October 24, 2026.
| Parameter | CircuitSense | CoronaSDR |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (10 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 2 | 10 — better |
| Update frequency | Every 3 days — better | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 37 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | CircuitSense LLC | Alien Systems S.R.L. |
Customer experience
CircuitSense
CoronaSDR
In-app purchases
CircuitSense
- CircuitSense Pro7 Days trial$9.991 Month
- CircuitSense Pro7 Days trial$79.991 Year
CoronaSDR
No in-app purchases









