KL Serials vs Overkill Solar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KL Serials
This utility app measures various electrical parameters like voltage, current, and power. It also offers multiple protection functions, including over-voltage, over-current, and over-temperature alerts, while monitoring battery capacity in real-time.
- Measures voltage, current, power, and capacity
- Monitors watt-hours and time
- Over-voltage protection
- Over-current protection
- Over-temperature protection
- Real-time battery capacity monitoring
- Automatic current direction identification
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The KL-F series volt-ampere meter is a new type of coulomb meter that can measure various physical parameters such as voltage, current, power, charge and discharge capacity, watt-hours, and time. At the same time, it can also set parameters to achieve over-voltage protection, under-voltage protection, Multiple protection functions such as over current protection, over power protection, and over temperature protection. The meter can automatically identify the direction of the current, and can monitor the battery capacity in real time.
Overkill Solar
This app connects to a solar battery management system to provide detailed monitoring and control. Users can track cell voltage, capacity, current, and manage charging/discharging ports. It also offers advanced configuration options for calibration, balancing, and protection settings.
- Monitor cell voltage and capacity
- Control charging and discharging ports
- Calibrate voltage and current
- Configure balancer and protection values
- Log voltage, current, and power
- Monitor BMS alarms and temperature
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Overkill Solar iOS App allows users to connect with the Overkill Solar Battery Management System (BMS). It can monitor voltage of the cells, total capacity, charging and discharging current, and switch the charging and discharging ports on or off. Features: - change bluetooth advertising name - unlock hardware protected BMS - save or load BMS configurations - calibrate cells voltage and charging or discharging current - log maximum or minimum voltage, current and power - enable and configure the balancer - modify the capacity settings - monitor temperature - monitor BMS alarms - import and export .fig files - set level 2 and 3 advanced protection values
Screenshots
Verdict
The clearest difference is ratings volume: Overkill Solar at 16 against KL Serials's 2. KL Serials's advantage is iOS requirement (9.0 vs 13.4). On price, rating, update cadence and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Overkill Solar holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Overkill Solar has 16 ratings behind it against 2, so its average is the more settled of the two.
KL Serials ships an update every 3 months, Overkill Solar every 4 months. The most recent releases landed on September 21, 2026 and August 18, 2026 respectively.
| Parameter | KL Serials | Overkill Solar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) | 4.7 (16 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 | 16 — better |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 13.4 |
| Further details — not scored | ||
| Size | 29 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Hangzhou Junce Instruments Co., Ltd. | Overkill Solar LLC |
Customer experience
KL Serials
Overkill Solar
In-app purchases
KL Serials
No in-app purchases
Overkill Solar
No in-app purchases
