# Epoch Li vs ProMasters Only

The clearest difference is review sentiment: ProMasters Only at 79% against Epoch Li's 29%. ProMasters Only also leads on rating (4.5 vs 2.6). Epoch Li's advantage is price (Free vs $69.99) and update cadence (every 3 weeks vs every 7 months). On ads, in-app purchases and device support there is nothing between them.

Epoch Li is free to download; ProMasters Only costs $69.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ProMasters Only holds the better App Store score, 4.5 against 2.6. Both are backed by a comparable volume of ratings — 70 and 21 respectively. Written reviews point the same way: 29% of Epoch Li's written reviews are positive against 79% of ProMasters Only's.

Epoch Li ships an update every 3 weeks, ProMasters Only every 7 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Epoch Li | ProMasters Only |
| --- | --- | --- |
| Price | **Free** | $69.99 |
| Rating | [2.6 (70 ratings)](https://appshunter.io/ios/app/epoch-li-ion/id1640434817/reviews) | **[4.5 (21 ratings)](https://appshunter.io/ios/app/promasters-only/id6737483353/reviews)** |
| Number of ratings | **70** | 21 |
| Positive reviews | 29.2% of reviews | **78.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | **Free** | Paid |
| Size | 35 MB | 27 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [EDG Sales International LLC](https://appshunter.io/developer/1546168152) | [Kip Amore](https://appshunter.io/developer/1776662732) |

## What reviewers say

### Epoch Li

[App page](https://appshunter.io/ios/app/epoch-li-ion/id1640434817)

Monitor your lithium-ion battery system in real-time via Bluetooth. View voltage, current, power, and internal resistance. Receive alerts for temperature, short circuits, and voltage deviations to extend battery life and enhance stability.

**Highlights:** Real-time voltage, current, power, and internal resistance display, Individual battery voltage and alarm status monitoring, Cell comparison and balancing display, Temperature and critical parameter warnings, Record of all warnings and protection events

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🔋 Outstanding battery performance and capacity
- 📱 Excellent real-time battery monitoring
- 👍 Simple and clean app interface (mentioned by one user)
- ⚡ Fast and efficient charging performance
- 💡 Provides detailed battery information (SOC, voltage, current, temp, cells)

**What reviewers complain about**

- 🐛 Frequent Bluetooth connection issues (drops, doesn't auto-connect)
- 🐛 App crashes frequently
- 🐛 Clunky and unreliable Bluetooth connectivity
- 🐛 App disconnects when minimized or switching apps
- 🐛 Does not remember previously connected devices

**Reported bugs**

- Bluetooth does not auto-connect
- Bluetooth signal frequently drops
- App crashes frequently
- App disconnects when minimized or switching apps
- App does not remember previously connected devices

**Requested features**

- Filter Bluetooth devices by MAC address prefix
- Implement BLE non-exclusive connection
- Bring back old app features (time to charge/discharge)
- Document app data and features
- Provide password for advanced settings


### ProMasters Only

[App page](https://appshunter.io/ios/app/promasters-only/id6737483353)

This app provides diagnostic tools and information specifically for Ram ProMaster vans. It offers real-time gauge monitoring, trouble code explanations, and a repair log, requiring a separate OBD dongle purchase.

**Highlights:** Trouble code reader with explanations, Real-time gauge monitoring (Voltage, Oil Pressure, Coolant Temp, etc.), Transmission fluid temperature gauge, Oil change and repair log book, Repair shop finder, Technical library with videos, Fluids and consumables specifications

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Epoch Li free?

Epoch Li is free to download, with no in-app purchases.

### Is ProMasters Only free?

ProMasters Only costs $69.99, with no in-app purchases.

### Which has better reviews, Epoch Li or ProMasters Only?

ProMasters Only is rated higher. Epoch Li averages 2.6 out of 5 from 70 ratings, while ProMasters Only averages 4.5 from 21 ratings.

### Do Epoch Li or ProMasters Only have ads?

Neither Epoch Li nor ProMasters Only shows ads.

### Which is updated more often, Epoch Li or ProMasters Only?

Epoch Li ships an update every 3 weeks, and ProMasters Only every 7 months. Most recently, Epoch Li was updated on November 3, 2026 and ProMasters Only on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*