Comparison

Bad Elf Flex vs NTRIP STX

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

NTRIP STX

Features
Read full description

NTRIP STX is a Ntrip client, capable of delivering RTK corrections to connected Stonex GNSS receivers to provide centimeter accuracy. You can then connect other mapping and surveying apps to these receivers for precise data collection and stakeout. NTRIP STX includes a world-wide database of available Ntrip casters. Free subscription: - Run the Ntrip connection for 10 minutes per day - Free 7 days trial of all “Professional" subscription features Paid "Professional" subscription: - no time limits on connection to Ntrip caster Purchase of a NTRIP STX subscription allows you to run the NTRIP STX App on all supported platforms. Subscription payments will be charged to your iTunes Account at confirmation of purchase and will automatically renew unless you cancel your subscription or turn off auto-renewal at least 24-hours prior to the end of the current subscription period. A cancelled subscription remains active until the end of the current period, at which time your account reverts to the “Free" subscription functionality. Customers selecting the Free Trial will enjoy “Professional" subscription features for a period of 7 days, after which they can elect to purchase a paid subscription. In the absence of a purchase, their account will revert to “Free" subscription functionality. For further information: • NTRIP STX Privacy Policy: https://its-geo.eu/Privacy.html • NTRIP STX Terms of Use: https://its-geo.eu/terms-of-service.html

Screenshots

Bad Elf Flex4 screens
NTRIP STX4 screens

Verdict

The call

The clearest difference is in-app purchases: Bad Elf Flex at none against NTRIP STX's 2. Bad Elf Flex also leads on update cadence (every 2 months vs every 10 months). On price, ads, device support and iOS requirement 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. NTRIP STX sells 2 in-app purchases, starting at $4.49 per month. Bad Elf Flex asks for nothing beyond the download.

UpkeepUpdate frequency

Bad Elf Flex ships an update every 2 months, NTRIP STX every 10 months. The most recent releases landed on September 26, 2026 and September 8, 2026 respectively.

Scorecard2 real differences · 8 level
Bad Elf Flex versus NTRIP STX: the parameters behind the verdict, then further details
ParameterBad Elf FlexNTRIP STX
PriceFreeFree
Rating3.6 (14 ratings) — better—
Positive reviews40.0% of reviews—
Number of ratings14 — better—
Update frequencyEvery 2 months — betterEvery 10 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.515.0 — better
Further details — not scored
Size33 MB109 MB
Age rating4+4+
DeveloperBad Elf, LLC.ITS Geo Solutions GmbH

In-app purchases

None

Bad Elf Flex

No in-app purchases

2 purchases

NTRIP STX

Subscriptions2
  • Professional - Monthly$4.491 Month
  • Professional - Annual$46.991 Year

Questions

Is Bad Elf Flex free?
Bad Elf Flex is free to download, with no in-app purchases.
Is NTRIP STX free?
NTRIP STX is free to download, with in-app purchases available.
Do Bad Elf Flex or NTRIP STX have ads?
Neither Bad Elf Flex nor NTRIP STX shows ads.
Which is updated more often, Bad Elf Flex or NTRIP STX?
Bad Elf Flex ships an update every 2 months, and NTRIP STX every 10 months. Most recently, Bad Elf Flex was updated on September 26, 2026 and NTRIP STX on September 8, 2026.

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