Comparison

EP Calipers vs iPacemaker Device

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

Head to head
About

EP Calipers

This medical app allows users to measure intervals and angles on electrocardiogram (ECG) images. It's designed for healthcare professionals to accurately analyze ECGs from photos or PDFs, aiding in calculations like heart rate and QT intervals.

Highlights
  • Measure ECG intervals
  • Measure ECG angles
  • Calculate mean heart rate
  • Determine corrected QT interval
  • Analyze ECG photos and PDFs
  • Supports Brugada syndrome beta angle measurement
Features
Read full description

EP Calipers provides electronic calipers to measure intervals on images of electrocardiograms (ECGs) or electrophysiologic recordings. Doctors, nurses and medical technicians photograph and send ECGs to each other via email and messaging using smart phones and tablets. It is difficult and inaccurate to make measurements on these images with mechanical calipers. EP Calipers can be used to make accurate ECG measurements and do calculations such as determining mean heart rate and corrected QT interval. Angles such as the beta angle in Brugada syndrome can be measured as well. Analyze ECG images you photograph or store on your device, as well as PDF files, such as ECGs generated by the AliveCor Kardia™ device.

About

iPacemaker Device

Access a vast database of implantable cardiac devices, including pacemakers and defibrillators. Get detailed technical specifications, connector information, advisories, and MRI compatibility checks. Compare devices and explore algorithms to aid in selection and management.

Highlights
  • Extensive device database
  • Detailed technical datasheets
  • Connector and tool information
  • Advisories and safety warnings
  • Multibrand MRI compatibility evaluation
  • Algorithm descriptions
  • Side-by-side device comparison
Features
Currently charting
Read full description

iPacemaker Device is an independent, multibrand technical and educational reference for electrophysiologists, hospital device technicians, and medical-device company specialists working with cardiac implantable electronic devices. Explore information on more than 7,000 pacemakers, ICDs, CRT devices, cardiac monitors, and leads from 60 manufacturers. TECHNICAL DATA Review device specifications, physical characteristics, dimensions, diagnostic features, and programming parameters. CONNECTOR HEADERS Examine connector layouts, port types, lead configurations, and documented tool specifications. Find device records with compatible connector-header characteristics and explore CSP configurations. MANUFACTURER ADVISORIES Access technical notes and safety communications included in the database and organized by product. MRI DOCUMENTATION Explore manufacturer-published MRI conditions for hypothetical device-and-lead combinations. This educational reference does not determine MRI eligibility for an individual patient or implanted system. ALGORITHMS Review more than 70 manufacturer-specific algorithms organized by manufacturer and technical or clinical scope. ANALYTICS Explore descriptive charts based on information contained in the dataset, including device longevity and survival data. Analytics do not predict the performance of an individual implanted device or recommend device selection. COMPARE Review specifications, programming options, longevity charts, and survival curves across multiple device records without generating treatment or device recommendations. Some content and features require a subscription. iPacemaker Device is intended solely for professional education and technical reference. It is not intended for diagnosis, patient-specific assessment, treatment selection, device programming, MRI eligibility, or emergency use. Always consult current manufacturer documentation and applicable clinical and institutional protocols. iPacemaker is independent and is not affiliated with, sponsored by, or endorsed by any cardiac-device manufacturer. Company names, product names, and trademarks belong to their respective owners.

Screenshots

EP Calipers4 screens
iPacemaker Device4 screens

Verdict

The call

The clearest difference is price: iPacemaker Device at Free against EP Calipers's $1.99. iPacemaker Device also leads on rating (4.7 vs 2.3) and update cadence (every 4 days vs every 3 months). EP Calipers's advantage is in-app purchases (none vs 7) and review sentiment (50% vs 28%). On 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

iPacemaker Device is free to download; EP Calipers costs $1.99 up front. iPacemaker Device sells 7 in-app purchases, starting at $9.99 per month. EP Calipers asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

iPacemaker Device holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: iPacemaker Device has 365 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 50% of EP Calipers's written reviews are positive against 28% of iPacemaker Device's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

EP Calipers ships an update every 3 months, iPacemaker Device every 4 days. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

Scorecard9 real differences · 2 level
EP Calipers versus iPacemaker Device: the parameters behind the verdict, then further details
ParameterEP CalipersiPacemaker Device
Price$1.99Free — better
Rating2.3 (6 ratings)4.7 (365 ratings) — better
Positive reviews50.0% of reviews — better27.9% of reviews
Number of ratings6365 — better
Update frequencyEvery 3 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
Best chart rank—#50 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS14.0 — better17.6
Further details — not scored
Size9 MB218 MB
Age rating12+4+
DeveloperEP StudiosIPACEMAKER S.R.L.

Customer experience

EP Calipers

All ratings6 ratings
Positive33.3%
Neutral0.0%
Negative66.7%
Written reviews8 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

iPacemaker Device

All ratings365 ratings
Positive92.1%
Neutral1.6%
Negative6.3%
Written reviews43 reviews
Positive27.9%
Neutral9.3%
Negative62.8%

Bugs and requests

EP Calipers

Not enough reviews yet to summarise bugs or requests.

iPacemaker Device

Reported bugs

18 issues
  • App keeps refreshing, cannot open
  • App cannot be opened
  • App enters interface and stops, cannot open
  • App has not worked for years
  • App hasn't worked for days
Show 13 more
  • App requires subscription after purchase
  • App requires subscription after update
  • App is not working
  • App is useless without subscription
  • App freezes and needs reboot
  • App seems to hang when opening
  • App does not open
  • App cannot be used unless you pay a subscription
  • App changed to subscription model
  • App not updated
  • App not updated for newer devices
  • Some newer devices cannot be found
  • Some leads labeled MRI conditional are found to be non-MRI

Requested features

6 requests
  • More equitable evaluation of company representation
  • Fix app hanging/slow opening
  • Update for newer devices
  • Grandfather in lifetime members
  • Refund original charge for lifetime members
Show 1 more
  • Remove disclaimer that opens every time

In-app purchases

None

EP Calipers

No in-app purchases

7 purchases

iPacemaker Device

Subscriptions7
  • 1 month subscription REGULAR$9.991 Month
  • 3 Months Subscription$49.993 Months
  • 12 months subscription REGULAR7 Days trial$49.991 Year
Show 4 more
  • 6 Months Subscription$59.996 Months
  • 12 Months Subscription$99.991 Year
  • 12 months subscription PREMIUM$109.991 Year
  • 12 months subscription PREMIUM7 Days trial$109.991 Year

Questions

Is EP Calipers free?
EP Calipers costs $1.99, with no in-app purchases.
Is iPacemaker Device free?
iPacemaker Device is free to download, with in-app purchases available.
Which has better reviews, EP Calipers or iPacemaker Device?
iPacemaker Device is rated higher. EP Calipers averages 2.3 out of 5 from 6 ratings, while iPacemaker Device averages 4.7 from 365 ratings.
Do EP Calipers or iPacemaker Device have ads?
Neither EP Calipers nor iPacemaker Device shows ads.
Which is updated more often, EP Calipers or iPacemaker Device?
EP Calipers ships an update every 3 months, and iPacemaker Device every 4 days. Most recently, EP Calipers was updated on October 1, 2026 and iPacemaker Device on October 14, 2026.

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