Comparison

treVolo U vs SDR

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

Head to head
About

treVolo U

Features
Read full description

treVolo U Bluetooth speaker is meticulously designed for home environments, delivering an exceptional audio experience. Our professional tuning technology focuses on subtle sound details, ensuring clarity whether you're enjoying broadcasts, audiobooks, playing handheld gaming device, or participating in home-based learning and online meetings. treVolo U enhances efficiency and comfort. Sound Modes treVolo U offers three sound modes for authentic audio or gaming effects, capturing nuances like lip and breath sounds, and ensuring vocals are clear and authentic. Customize Sound Personalized sound settings allow you to customize tuning for the clearest and most comfortable audio experience. Other Advanced Features The treVolo U app enables you to set up features such as bedtime mode, automatic power-off, sound effects, and true wireless stereo soundstage creation, unlocking the full potential of treVolo U.

About

SDR

Control your Icom transceiver remotely or locally from your iPhone. Operate in all modes, log QSOs, and utilize integrated digital modes like FT8/FT4 and SSTV. No extra hardware is needed for global access.

Highlights
  • Remote transceiver operation
  • All mode control
  • Auto logging logbook
  • Integrated FT8/FT4 tool
  • Integrated SSTV receiver
  • Integrated CW decoder and keyer
  • DX-Cluster integration
Currently charting
Read full description

Software Defined Radio Client for Icom Transceivers and your iPhone SDR-Control Mobile is a full featured iPhone App to operate your Icom Transceiver at home or from around the world without additional Hard- or Software. Important: This App requires one of the following Icom Transceivers: IC-705, IC-7610, IC-9700, IC-7760 or the IC-R8600 Receiver or the new IC-7300 MK2 FACTS AND FEATURES: ■ Native iOS 26 app, backward compatible to iOS 17 ■ Compatible with any iPhone ■ Complete operation of your Icom Transceiver in all modes ■ Use the App local or to remote access of your Transceiver from any place without additional Hard- or Software ■ Logbook with auto logging, ADIF Im-/Export ■ UDP Log submission when using external logging software ■ Integrated full featured FT8 / FT4 Tool ■ Integrated SSTV receiver (NEW) ■ Integrated CW Decoder ■ Integrated CW Keyer ■ DX-Cluster integration ■ Call sign lookup integrated ■ Displays Calls on Map with heading and distance information ■ And much more... WHAT YOU NEED: - An Icom IC-705, IC-7610, IC-9700 or IC-7760 Transceiver or IC-R8600 Receiver or the new IC-7300 MK2 - The Transceiver needs to be connected to your Network (WiFi or LAN) - No USB cable needed or supported - An iPhone that runs at least iOS 17 Find out more here: https://ham-radio-apps.com Read the Manual: http://go-to.me/sdrcontrol-mobile-manual

Screenshots

treVolo U4 screens
SDR4 screens

Verdict

The call

The clearest difference is price: treVolo U at Free against SDR's $44.99. treVolo U also leads on device support (3 vs 1) and iOS requirement (12.1 vs 17.6). SDR's advantage is update cadence (every 2 weeks vs every 2 months) and chart position (#129 vs unranked). On 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

CostPrice · In-app purchases · Ads · Monetization

treVolo U is free to download; SDR costs $44.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

treVolo U ships an update every 2 months, SDR every 2 weeks. The most recent releases landed on September 16, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 6 level
treVolo U versus SDR: the parameters behind the verdict, then further details
ParametertreVolo USDR
PriceFree — better$44.99
Rating—4.5 (64 ratings) — better
Positive reviews—84.1% of reviews
Number of ratings—64 — better
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
Best chart rank—#129 — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12.1 — better17.6
Further details — not scored
Size130 MB47 MB
Age rating4+4+
DeveloperBenQ CorporationMarcus Roskosch

Bugs and requests

treVolo U

Not enough reviews yet to summarise bugs or requests.

SDR

Reported bugs

12 issues
  • Dialogs do not scale with larger text setting
  • Frequency display overlaps buttons
  • FT8 decoding issues (lower signal levels than WSJTX)
  • App crashes and leaves radio in transmit
  • Logbook export not functional after update
Show 7 more
  • Function button for horizontal scrolling not fully displayed
  • FT8 decode is useless and unreliable
  • Messed up radio, requiring reset
  • RX audio unusable outside home network (prior to 1.5.1)
  • Struggles with audio RX packets on remote cellular networks
  • Cannot work over mobile data with certain carriers (EE)
  • FT8 alerts sound but don't display

Requested features

14 requests
  • Develop for IC-7800
  • CarPlay support
  • Apple Watch add-on
  • Windows version
  • JS8call support
Show 9 more
  • More digital modes
  • Display memory bank names
  • Initiate memory scan from app
  • WSPR implementation
  • Tool for WSPR
  • More FT8/FT4 features (e.g., setting transmit frequency directly in FT8 view)
  • Send image to unit
  • KISS TNC support
  • Control digital modes (reflectors, etc.)

In-app purchases

None

treVolo U

No in-app purchases

None

SDR

No in-app purchases

Questions

Is treVolo U free?
treVolo U is free to download, with no in-app purchases.
Is SDR free?
SDR costs $44.99, with no in-app purchases.
Do treVolo U or SDR have ads?
Neither treVolo U nor SDR shows ads.
Which is updated more often, treVolo U or SDR?
treVolo U ships an update every 2 months, and SDR every 2 weeks. Most recently, treVolo U was updated on September 16, 2026 and SDR on September 24, 2026.

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