FieldFox vs splotRF
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FieldFox
This application allows for remote viewing and control of Keysight FieldFox handheld analyzers. Mirror the instrument's display on your iOS device and access product documentation. Full remote control requires a specific instrument option.
- Remote viewing of FieldFox instruments
- Full remote control with option 030
- Instrument display mirroring
- Access to product manuals and brochures
- View and share documentation
- Portrait and landscape orientation support
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For Use with Keysight Technologies FieldFox handheld analyzers. Provides remote viewing capability for FieldFox instruments, or full remote control if the FieldFox is outfitted with instrument remote connectivity option 030. Contact Keysight Technologies for details on option 030. The FieldFox Remote Viewer application is used to remotely monitor or remotely control a FieldFox instrument. Connect FieldFox to wired LAN and power, then connect your IOS device to WIFI or cellular to remotely monitor or control the instrument. Once connected, the instrument display is mirrored to the IOS device. If the FieldFox has been outfitted with instrument option 030, full remote control can be performed from the iPod, iPhone or iPad (running IOS 7.1 or later). Portrait and Landscape orientations are supported with Landscape providing a full screen view of the data screen (with popup keyboard), and portrait providing a visual representation of the FieldFox display and keyboard together. Included in the app is a variety of online resources including product manuals, brochures, app notes, and training videos. Product documentation can be viewed and shared with third party apps such as iBooks, for offline storing and viewing. (Note WIFI or cellular connection required for all documentation content except the Intro Video, which is locally stored in the app). Connections to the remote FieldFox instrument can be made from anywhere the IOS device has network connections that can reach the instrument LAN connection. Note: Using cellular connectivity may produce slower connection response than WIFI, and may incur carrier data usage charges. Note: For remote viewing or remote control, a FieldFox instrument (not included) is required. Contact Keysight via the support link for information on how to purchase a FieldFox instrument for use with this program. Note: For remote viewing only, no additional FieldFox instrument licenses are required. For full remote control, FieldFox instrument option 030 is required. Contact Keysight Technologies for full details on how to outfit a FieldFox with this option.
splotRF
Visualize and analyze touchstone S-parameter data with interactive plots. Supports multiple file overlays, stability calculations, and various matrix conversions. Export data in vector graphics formats.
- Plot .snp format S-parameter data
- Stability circles and µ/µ' analysis
- Overlay multiple trace data
- View data as a table
- S/Y/Z matrix conversion
- Smith Chart, Polar, and Rectangular plots
- Export to PDF
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Key Features: • plots .snp format s-parameter touchstone data • stability circles for load and source • µ and µ' for load and source stability • interactive data markers • overlay multiple trace data on a single plot • overlay trace data from multiple files • view data as a table list • arbitrary number of ports (.s1p, .s2p, s3p…snp support) • S/Y/Z matrix conversion • mA/RI/dB formatting • interpolation over frequency • exports vector graphics to .pdf • plotting display properties and configuration are saved within file comments • automated grid layout • Smith Chart, Polar and Rectangular plots • reads and plots .zip archives containing s-parameter data
Screenshots
Verdict
The clearest difference is rating: splotRF at 5.0 against FieldFox's 4.0. splotRF also leads on update cadence (every 10 days vs every 12 months). FieldFox's advantage is iOS requirement (12.0 vs 18.0). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
splotRF holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 2 respectively.
FieldFox ships an update every 12 months, splotRF every 10 days. The most recent releases landed on October 8, 2026 and September 28, 2026 respectively.
| Parameter | FieldFox | splotRF |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 2 |
| Update frequency | Every 12 months | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 27 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Keysight Technologies, Inc. | DirectRF |
Customer experience
FieldFox
splotRF
In-app purchases
FieldFox
No in-app purchases
splotRF
No in-app purchases









