Comparison

RMU3 Config vs Bad Elf Flex

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

Head to head
About

RMU3 Config

Configure and monitor cathodic protection rectifiers remotely. This app connects via Bluetooth to the RMU3 unit, allowing full control over settings, viewing diagnostic information, and managing measurement data. It requires specific hardware to function.

Highlights
  • Bluetooth configuration interface
  • Remote monitoring of cathodic protection rectifiers
  • Full RMU3 configuration
  • View readings and limits
  • Diagnostic status screen
  • Integrated manual and wiring diagrams
Features
Read full description

*** Requires a corTalk® RBT1 or RMU123PGM and RMU3 to use. *** Contact us at 'sales.rmu3@mobiltex.com' to purchase. This app is for configuring the corTalk® RMU3 (Remote Monitoring Unit 3) with a Bluetooth configuration interface. Both the RBT1 or RMU123PGM are compatible. They both function as a complete RMU3 programming interface but only requires the Bluetooth connection of your phone to use. The RMU3 is used to monitor a cathodic protection rectifier with accurate measurement of a wide variety of signals; it can also control the rectifier for survey operations by switching a relay at precisely timed intervals. This app allows access to diagnostic information on the RMU3 and allows setting up the configuration to meet the customer's needs. Note that measurement data logs, due to their size, can only be extracted from the RMU3 using the PC configuration application through the USB port. The app allows full configuration of the RMU3 including - slot measurement types - limits - slot scaling and offset - relay options - instant off timing - interruption On/Off/Cycle Other features include the - viewing of readings and their limits - detailed status screen for troubleshooting - integrated manual - wiring diagrams for each measurement type The RBT1 and RMU123PGM is always in a Bluetooth pairing mode and requires a pairing code entered on the app. The pairing code (default=123456) can be found and changed with the app. Once paired, the iOS device can reconnect without needing to re-enter the code. The RBT1 pairing code can be reset by tapping the RBT1 5 times in 10 seconds with a user-supplied magnet.

About

Bad Elf Flex

This utility app enhances the functionality of Bad Elf Flex and Flex Mini GNSS receivers. It allows users to monitor hardware health, adjust settings, and update firmware. For the Flex model, it also enables the purchase and application of tokens for advanced features and correction sources like SBAS and RTK.

Highlights
  • Monitor GNSS receiver health
  • Change hardware settings
  • Perform firmware updates
  • Purchase and load Flex Tokens
  • Enable hardware-based features
  • Access correction sources
Features
Read full description

This is the free companion utility app for the flexible, intuitive, and affordable Bad Elf Flex and Flex Mini GNSS receivers. Designed for GIS and survey professionals, the Bad Elf Flex and Flex Mini connect to your iPhone or iPad via Bluetooth and provide high-accuracy location data to ANY and ALL field data collection apps in your workflow. This app allows you to view the health of the Flex and Flex Mini hardware, change settings, and perform firmware updates. For the Bad Elf Flex, the app also supports purchasing and loading Flex Tokens into the hardware for enabling hardware-based features and correction sources. Several correction sources are supported including SBAS, RTK via NTRIP, and Atlas (L-band) satellite corrections. Visit https://bad-elf.com/ to learn more about the Bad Elf Flex and Flex Mini GNSS receivers. NOTES: * This app requires a Bad Elf Flex or Flex Mini to operate. * Our "Bad Elf GPS" companion app supports our legacy mapping-grade receivers: Bad Elf GPS Pro, GPS Pro+, Surveyor, and GPS for Lightning dongle. * Continued use of the GPS running in the background can dramatically decrease battery life.

Screenshots

RMU3 Config4 screens
Bad Elf Flex4 screens

Verdict

The call

The clearest difference is rating: Bad Elf Flex at 3.6 against RMU3 Config's 3.0. Bad Elf Flex also leads on ratings volume (14 vs 1) and update cadence (every 2 months vs every 4 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Bad Elf Flex holds the better App Store score, 3.6 against 3.0. That said, the two scores are not equally well evidenced: Bad Elf Flex has 14 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

RMU3 Config ships an update every 4 months, Bad Elf Flex every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard3 real differences · 7 level
RMU3 Config versus Bad Elf Flex: the parameters behind the verdict, then further details
ParameterRMU3 ConfigBad Elf Flex
PriceFreeFree
Rating3.0 (1 ratings)3.6 (14 ratings) — better
Positive reviews—40.0% of reviews
Number of ratings114 — better
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.5 — better
Further details — not scored
Size23 MB33 MB
Age rating4+4+
DeveloperMobiltex DataBad Elf, LLC.

Customer experience

RMU3 Config

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%

Bad Elf Flex

All ratings14 ratings
Positive57.1%
Neutral14.3%
Negative28.6%
Written reviews5 reviews
Positive40.0%
Neutral0.0%
Negative60.0%

In-app purchases

None

RMU3 Config

No in-app purchases

None

Bad Elf Flex

No in-app purchases

Questions

Is RMU3 Config free?
RMU3 Config is free to download, with no in-app purchases.
Is Bad Elf Flex free?
Bad Elf Flex is free to download, with no in-app purchases.
Which has better reviews, RMU3 Config or Bad Elf Flex?
Bad Elf Flex is rated higher. RMU3 Config averages 3.0 out of 5 from 1 ratings, while Bad Elf Flex averages 3.6 from 14 ratings.
Do RMU3 Config or Bad Elf Flex have ads?
Neither RMU3 Config nor Bad Elf Flex shows ads.
Which is updated more often, RMU3 Config or Bad Elf Flex?
RMU3 Config ships an update every 4 months, and Bad Elf Flex every 2 months. Most recently, RMU3 Config was updated on November 2, 2026 and Bad Elf Flex on November 3, 2026.

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