Bad Elf Flex vs Kor Mobile
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Monitor GNSS receiver health
- Change hardware settings
- Perform firmware updates
- Purchase and load Flex Tokens
- Enable hardware-based features
- Access correction sources
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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.
Kor Mobile
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Kor offers a mobile interface for YSI’s industry-leading EXO Multiparameter Water Quality Sondes, providing powerful, real-time water quality monitoring capabilities in the palm of your hand. Connect to Kor Mobile on your iOS device using a KorLink Bluetooth adapter connected to an EXO sonde via a field cable to establish a Bluetooth connection to view and manage water quality data directly in the field. No internet connection required. Key Features: • Data Management – View recorded data and transfer or share data files in the field • Site Management – Organize and access data by location • Deployment Tools – Streamline setup and configuration in the field • Sensor Calibration – Perform calibrations directly from your phone • Instrument Settings – Adjust parameters and settings with ease • App Settings – Customize your experience
Screenshots
Verdict
Bad Elf Flex and Kor Mobile are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
Bad Elf Flex ships an update every 3 months, Kor Mobile every 4 months. The most recent releases landed on September 9, 2026 and September 18, 2026 respectively.
| Parameter | Bad Elf Flex | Kor Mobile |
|---|---|---|
| Price | Free | Free |
| Rating | 3.6 (14 ratings) — better | — |
| Positive reviews | 40.0% of reviews | — |
| Number of ratings | 14 — better | — |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.5 | 14.5 — better |
| Further details — not scored | ||
| Size | 32 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Bad Elf, LLC. | Xylem Inc. |
In-app purchases
Bad Elf Flex
No in-app purchases
Kor Mobile
No in-app purchases









