Comparison

Bad Elf Flex vs bmLogger

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

Head to head
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.

About

bmLogger

This app connects to Bluetooth sensors to provide real-time temperature and humidity monitoring. It allows for data logging, historical analysis, and customizable alerts for various environmental conditions. Ideal for cold chain compliance, food safety, and climate control.

Highlights
  • Real-time temperature and humidity readings
  • Data logging and historical graphs
  • CSV data export
  • Multiple sensor connection
  • Customizable alerts
  • Offline functionality
Features
Read full description

Connect to Blue Maestro Bluetooth sensors for real-time environmental monitoring. Perfect for cold chain compliance, food safety, and climate control. Description: bmLogger is the official companion app for Blue Maestro's professional-grade Bluetooth temperature and humidity sensors. Whether you're monitoring cold storage, tracking pharmaceutical shipments, or ensuring optimal conditions in your wine cellar, bmLogger delivers precise, reliable data right to your smartphone. KEY FEATURES Real-Time Monitoring Live temperature and humidity readings updated every second Signal strength indicator for connection quality Battery level monitoring for all connected devices Data Logging and History Download thousands of logged data points from your sensors View detailed graphs with zoom and pan functionality Export data as CSV files for analysis and compliance reporting Device Management Connect to multiple Blue Maestro sensors simultaneously Customize device names and add notes for easy identification Configure logging intervals from 1 second to 24 hours Set high and low temperature and humidity alerts Cloud Sync (Premium) Securely store your data in the cloud Access historical readings from any device Share reports with colleagues and clients PERFECT FOR Food Safety: Monitor refrigerators, freezers, and cold storage Healthcare: Track vaccine storage and medication temperatures Wine and Beverage: Ensure optimal cellar conditions Pharmaceuticals: Maintain cold chain compliance Data Centers: Monitor server room climate Agriculture: Track greenhouse conditions Home: Monitor any environment that matters to you Logistics: Track shipment conditions in transit SUPPORTED DEVICES Tempo Disc Temperature and Humidity Sensor Tempo Disc Temperature Sensor Tempo Disc Barometric Pressure Sensor Pacif-i Smart Thermometer And all current Blue Maestro Bluetooth sensors TECHNICAL SPECIFICATIONS Supports devices with logging capacities up to 100,000+ readings Configurable logging intervals Bluetooth Low Energy for extended battery life Works offline - no internet required for local monitoring Download bmLogger today and take control of your environmental monitoring with professional-grade precision. Keywords: temperature,humidity,sensor,bluetooth,monitoring,logger,thermometer,cold chain,data logger,climate What's New in Version 13.0.1: Improved calibration handling for latest generation sensors Enhanced data export functionality Performance optimizations Bug fixes and stability improvements

Screenshots

Bad Elf Flex4 screens
bmLogger4 screens

Verdict

The call

The clearest difference is review sentiment: bmLogger at 100% against Bad Elf Flex's 40%. bmLogger also leads on rating (5.0 vs 3.6) and update cadence (every 3 days vs every 3 months). Bad Elf Flex's advantage is ratings volume (14 vs 4). 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

bmLogger holds the better App Store score, 5.0 against 3.6. Both are backed by a comparable volume of ratings — 14 and 4 respectively. Written reviews point the same way: 40% of Bad Elf Flex's written reviews are positive against 100% of bmLogger's.

UpkeepUpdate frequency

Bad Elf Flex ships an update every 3 months, bmLogger every 3 days. The most recent releases landed on September 9, 2026 and September 17, 2026 respectively.

Scorecard4 real differences · 6 level
Bad Elf Flex versus bmLogger: the parameters behind the verdict, then further details
ParameterBad Elf FlexbmLogger
PriceFreeFree
Rating3.6 (14 ratings)5.0 (4 ratings) — better
Positive reviews40.0% of reviews100.0% of reviews — better
Number of ratings14 — better4
Update frequencyEvery 3 monthsEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.514.0 — better
Further details — not scored
Size32 MB42 MB
Age rating4+4+
DeveloperBad Elf, LLC.Blue Maestro

Customer experience

Bad Elf Flex

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

bmLogger

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Bad Elf Flex

No in-app purchases

None

bmLogger

No in-app purchases

Questions

Is Bad Elf Flex free?
Bad Elf Flex is free to download, with no in-app purchases.
Is bmLogger free?
bmLogger is free to download, with no in-app purchases.
Which has better reviews, Bad Elf Flex or bmLogger?
bmLogger is rated higher. Bad Elf Flex averages 3.6 out of 5 from 14 ratings, while bmLogger averages 5.0 from 4 ratings.
Do Bad Elf Flex or bmLogger have ads?
Neither Bad Elf Flex nor bmLogger shows ads.
Which is updated more often, Bad Elf Flex or bmLogger?
Bad Elf Flex ships an update every 3 months, and bmLogger every 3 days. Most recently, Bad Elf Flex was updated on September 9, 2026 and bmLogger on September 17, 2026.

Other comparisons