epTools vs EP Calipers
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
epTools
This app provides a suite of tools for diagnosing and managing cardiac rhythm disorders. It offers algorithms for localizing arrhythmias, differentiating conditions like WPW from FVF, and assessing disease risks. Users can visualize progress, save analysis paths, and access cited scientific references.
- Arrhythmia localization algorithms
- Differentiate WPW from FVF
- Atrial tachycardia localization
- Ventricular tachycardia localization
- Disease assessment criteria
- Save decision path images
- Access scientific references
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Trusted for over 15 years by heart rhythm professionals worldwide, epTools is a collection of useful tools for the evaluation of heart rhythm disorders. It is available on iPhone and iPad devices. Resources include algorithms used to localize arrhythmia substrates and reference guides to assist in the identification and, management of cardiac rhythm disorders and tools to calculate commonly used measurements and risk scores. Peer-reviewed algorithms are implemented by tools via an intuitive user interface. References are provided. Tools guide the user or AI through a series of questions to arrive at an answer while providing a graphical visualization of their progress and result of their analysis. Use of the save path to image feature allows users to save an image of the current decision path when using many of the decision analysis tools included. These images, which appear in the photo album, may be useful to communicate findings with colleagues. Included tools: Preexcitation variant localization: Arruda, Milstein, Taguchi , D'Avila, Li, Pambrun, Baek and Crinion and O'Leary et al. Atrial tachycardias: Ellenbogen and Kistler et al (localization ) De Ponti et al tool (calculates the appropriate mapping window for isthmus identification) Miyazaki et al (localizes macro reentrant ATs based on pacing responses) Ischemic ventricular tachycardia localization: Miller, Segal and Andreu et al) Idiopathic ventricular tachycardia and premature ventricular contraction: Ito, Park and Enriquez et al (localization) ABC-VT Risk Score Differentiation of left vs right ventricular outflow tract sites: QRS-RVA Interval V₂S/V₃R Index TZ Index V₂ Transition ratio R/S-wave Amplitude, R-Wave Duration, R-wave amplitude, V₂QRSI40 and RV₁-₃ indices. Differentiate endocardial from epicardial VTs: Maximum deflection index Daniels and Berruezo et al criteria Differentiate SVT from VT: Brugada, Verckei and Moccetti et al Disease Assessment: Consensus criteria for ARVD/C and Short QT Syndrome 5-yr risk of SCD in HCM (O'Mahon et al, and AHA)and LQTS (1-2-3-LQTS-Risk) 5-yr risk of life threatening VTA with LMNA variant Inadequate DFT safety margin (Hsu et al ) LA arrhythmogenic substrate (Kosiuk et al, D'Ambrosio et al) 30-day mortality after PPM and ICD lead extraction (Brunner et al) 1-4 year mortality in 1° prevention ICD placement (Bilchick et al, SHOCKED) Shanghai score (Brugada Syndrome), VT prediction in ARVD/C (Cadrin-Tourigny et al.) Suspicious Index In Lyme Carditis (SILC) PADIT and BLISTER CIED infection risk Misc: Confirm conduction system capture with LBBAP. myPace personalized heart rate calculator A CIED/electrocautery manager is included. Detailed preoperative plans can be created and shared by text or email. Clinical guidelines and consensus statement resource i CHADS₂, CHA₂DS₂VASc and ATRIA stroke risk, HAS-BLED bleeding risk scores, QT correction heart rate (Bazett or Fredericia, Hodges) and left bundle branch block (Bogosian and Yankelson et al)
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.
- 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
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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.
Screenshots
Verdict
The clearest difference is price: EP Calipers at $1.99 against epTools's $19.99. EP Calipers also leads on iOS requirement (14.0 vs 16.0). epTools's advantage is rating (4.8 vs 2.3) and review sentiment (88% vs 50%). On update cadence, ads, in-app purchases and chart position 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
epTools costs $19.99 and EP Calipers $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
epTools holds the better App Store score, 4.8 against 2.3. That said, the two scores are not equally well evidenced: epTools has 519 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 88% of epTools's written reviews are positive against 50% of EP Calipers's.
epTools ships an update every 4 months, EP Calipers every 3 months. The most recent releases landed on September 21, 2026 and September 13, 2026 respectively.
| Parameter | epTools | EP Calipers |
|---|---|---|
| Price | $19.99 | $1.99 — better |
| Rating | 4.8 (519 ratings) — better | 2.3 (6 ratings) |
| Positive reviews | 88.2% of reviews — better | 50.0% of reviews |
| Number of ratings | 519 — better | 6 |
| Update frequency | Every 4 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Best chart rank | #187 | #178 — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 9 MB |
| Age rating | 17+ | 12+ |
| Developer | Busy Being Born Solutions, LLC | EP Studios |
Customer experience
epTools
EP Calipers
Bugs and requests
epTools
Reported bugs
1 issue- Crash problem fixed
Requested features
10 requests- Add CAAP-AF
- Better tools for PVC localization
- More explanations in each pathway
- German translation
- Links to papers with algorithms
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- New algorithm using only lead aVR for differential diagnosis of wide QRS complex tachycardia
- Diagnostic features for different arrhythmia (AVNRT, AVRT)
- HD format for iPad compatibility
- More algorithms
- Aortic cusp, RVOT, entrainment criteria, long QT, AFib ablation techniques
EP Calipers
Not enough reviews yet to summarise bugs or requests.
In-app purchases
epTools
No in-app purchases
EP Calipers
No in-app purchases








