Comparison

BlindSquare vs GPSlogger Kalman

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

Head to head
About

BlindSquare

This app provides accessible navigation for blind and visually impaired individuals, both indoors and outdoors. It uses GPS and compass data, combined with location information, to verbally guide users to points of interest and street crossings. Users can also control the app via voice commands and integrate with popular navigation apps.

Highlights
  • Indoor and outdoor navigation
  • Verbal guidance to points of interest
  • Street crossing announcements
  • Voice command control
  • Integration with popular navigators
  • Save private locations
  • Foursquare client features
Features
Currently charting
Read full description

BlindSquare is pioneering accessible navigation both indoors and outdoors. Know where you are, know where you're going, travel with confidence. BlindSquare is a new solution that combines the latest technology to help the blind with their daily lives. It has been developed in collaboration with blind people and carefully field tested. You need either an iPhone or an iPad to get started. It also supports some additional accessories to enhance the experience. How does it work? BlindSquare uses GPS and the compass to locate you. It then gathers information about the surrounding environment from FourSquare. BlindSquare has some unique algorithms to decide what information is the most relevant and then speaks it to you with high quality speech synthesis. “What's the most popular café within 200 meters radius? Where is the post office or the library?” You can control BlindSquare also through voice commands. The Voice Command feature is a premium service requiring purchase of credits for continuous use. Voice Command Credits are available as an in-app purchase on the App Store. Using BlindSquare as a GPS solution: When you start the app, it will start telling you the interesting places and street crossings around you. By changing the radius, you can limit the area you are interested in. You can also search by search term or by category. You can select an interesting place from the search results and perform the following tasks: 1) Get contact info (address, phone number) 2) Open twitter feed or restaurant menu (if provided) 3) Make a phone call 4) Start tracking the place (BlindSquare will assist you by repeating the distance and the clock face direction) 5) Start your favourite navigator for turn-by-turn instructions (TomTom, Navigon or Apple Maps) BlindSquare is aware of when you travel by car, bus or train and starts to report interesting places in front of you (for example, the next stops) and street crossings when you are passing them. You can also save your own private places to iCloud so they will be found with your every device. Using BlindSquare as a Foursquare client: If you like to play Foursquare, you can do the following with BlindSquare: 1) Get a list of nearby FourSquare venues 2) When you are in a place, you can check in by shaking your device 3) Do a check in with commenting and twitter/facebook sharing 4) Correct the location of the place BlindSquare supports the following languages: English, Arabic, Bulgarian, Croatian, Czech, Danish, Dutch, Estonian, Finnish, French, German, Greek, Hebrew, Hungarian, Italian, Japanese, Korean (South Korea), Norwegian, Polish, Portugues, Romanian, Russian, Spanish, Swedish and Turkish. VoiceOver usage is supported but it also includes higher quality additional speech synthesis by Acapela Text-To-Speech from Acapela Group. Instructions in English: https://www.blindsquare.com/user-guide/ and https://www.blindsquare.com/faq/ Please note: This app retrieves data in real time from Foursquare and Open Street Map. Use of a flat rate data plan is highly recommended. Continued use of GPS running in the background can dramatically decrease battery life. Having only been released in May 2012, BlindSquare has already received several prizes and awards: - GSMA: Global Mobile Awards 2013, Best Mobile Health Product or Service - Apps4Finland 2012 - OpenCities App Challenge 2012 - The Finnish Information Processing Association: Best Product 2012 Please note: To use BlindSquare, your iCloud account has to be active so BlindSquare can access it to save your settings and places. Continued use of GPS running in the background can dramatically decrease battery life.

About

GPSlogger Kalman

Features
Read full description

Record tracks using Apple Watch with GPS, iPhone or iPad with GPS. The app uses Kalman filtering on the GPS and Altimeter data to improve accuracy. WeatherKit is used to store wind conditions at point of recording. Weather View and Widget. MapKit is used to acquire GPS location data. On Apple Watch, HealthKit is used to acquire heart rate data and to export it into the Health app together with the workout activity. RECORDING FEATURES -Creates one track with Kalman filtering for latitude / longitude coordinates and elevation. -Stores wind conditions into the GPX file at time of recording. -Stores water temperature into the GPX file if available on Apple Watch. -Works on iOS, iPadOS and watchOS. -Tracks can be pushed from the Apple Watch, imported using the built-in File Importer, or opened from Files App, Email, iMessage. -Export using standard File Exporter -Export GPX 1.0, 1.1 or Garmin Fit -Recording of accelerometer and gyroscope data -2Hz sampling with interpolation and accelerometer guessing. -Acceleration longitude / latitude, user direction and rotation rate. ANALYSIS FEATURES -Import GPX, Garmin FIT or Vakaros VKX format with Trim and Heel -Calculates polar plot -Calculates VMG (Velocity Made Good) on iOS and iPadOS -Calculates / finds maximum speeds segments over 2s, 10m, 100m, 1000m and 1852m. -1, 5 or 25 non-overlapping speed segments -Toggle data graph between speed, altitude, course, heart rate (if available), horizontal accuracy and cumulated upwind distance -Allows to select a segment with marker to calculate distance, time and average speed -Direct select of speed segments in sortable table -Finding tacks, jibes and crashes with direct select in sortable table -Allows to crop samples, decimate by 5, detect and cure glitches -Supports importing multiple tracks (iOS and iPadOS only) with overlay in the chart metric -Import filter for tracks with sortable table -Weather for local and favorite location -Weather widget to not miss the upcoming wind conditions. Widget is interactive with toggle either showing local or favorite location. WATCHOS EXTRA FEATURES -The heart rate on watchOS uses linear interpolation between heart rate updates so that each GPS sample point will have a valid value in the GPX log. -The workout will also appear in the iOS Fitness app together with the track log (HealthKit). -The total distance is shown as a widget or current local wind speed is shown

Screenshots

BlindSquare4 screens
GPSlogger Kalman4 screens

Verdict

The call

The clearest difference is price: GPSlogger Kalman at $3.99 against BlindSquare's $39.99. BlindSquare's advantage is in-app purchases (none vs 1) and chart position (#191 vs unranked). On update cadence, ads and device support 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

BlindSquare costs $39.99 and GPSlogger Kalman $3.99 up front. GPSlogger Kalman sells 1 one-off in-app purchase. BlindSquare asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 20, 2026 and October 15, 2026 respectively.

Scorecard4 real differences · 7 level
BlindSquare versus GPSlogger Kalman: the parameters behind the verdict, then further details
ParameterBlindSquareGPSlogger Kalman
Price$39.99$3.99 — better
Rating4.0 (61 ratings) — better—
Positive reviews83.4% of reviews—
Number of ratings61 — better—
Update frequencyMonthlyMonthly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree with in-app purchases—
Best chart rank#191 — better—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS15.6 — better17.6
Further details — not scored
Size66 MB15 MB
Age rating4+4+
DeveloperMIPsoft OyAlmansor Kerroum

Bugs and requests

BlindSquare

Reported bugs

4 issues
  • Crashing issues
  • Incorrect address/street announcements
  • Simulation mode problems
  • Bluetooth connectivity failures

Requested features

5 requests
  • Turn-by-turn navigation
  • Intersection details (left/right side)
  • Public transit integration
  • Voice control/commands
  • Multi-language support

GPSlogger Kalman

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

BlindSquare

No in-app purchases

1 purchases

GPSlogger Kalman

One-time1
  • Full Version$3.99

Questions

Is BlindSquare free?
BlindSquare costs $39.99, with no in-app purchases.
Is GPSlogger Kalman free?
GPSlogger Kalman costs $3.99, and also offers in-app purchases.
Do BlindSquare or GPSlogger Kalman have ads?
Neither BlindSquare nor GPSlogger Kalman shows ads.
Which is updated more often, BlindSquare or GPSlogger Kalman?
BlindSquare ships an update monthly, and GPSlogger Kalman monthly. Most recently, BlindSquare was updated on October 20, 2026 and GPSlogger Kalman on October 15, 2026.

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