Comparison

Theta vs XY BMS

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

Head to head

About

Theta

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Theta-Meter standard e-meter app. Theta-Meter e-meter hardware can be connected to this app using Bluetooth LE 4.0 (or higher) or Wi-Fi connection. This app measures the electric resistance of the object, connected to Theta-Meter e-meter electrodes. This app is not intended to diagnose, treat, cure, or prevent any disease or medical or therapeutic use. Using a needle indicator, this app shows the dynamics of changes in the electrical resistance of an object connected to the Theta-Meter device.

About

XY BMS

Features

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XY BMS is a battery management system APP. It can connect multiple battery management systems at the same time through Bluetooth communication to realize real-time monitoring of battery status and operation parameter setting. Effectively improve the safety, efficiency, stability and prolong the battery life of the battery system. 1. Real-time display of voltage, current, power, calculation capacity, number of cycles, temperature, expected charging time or discharge time. 2. Display the battery running status and alarm type in real time. 3. Real-time display of voltage value, pressure difference, balance state, etc. 4. Parameters related to battery operation can be set through password verification. 5. The XY BMS can be connected to multiple batteries at the same time, and it is easy to switch between batteries on the home page.

Screenshots

Theta2 screens

XY BMS4 screens

Verdict

The call

The clearest difference is update cadence: XY BMS at every 3 months against Theta's every 31 months. XY BMS also leads on iOS requirement (11.0 vs 14.0). Theta's advantage is device support (4 vs 2). On price, ads and in-app purchases 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Theta ships an update every 31 months, XY BMS every 3 months. Both last shipped on October 27, 2026.

Scorecard3 real differences · 3 level

Theta versus XY BMS: the parameters behind the verdict, then further details
Parameter	Theta	XY BMS
Price	Free	Free
Update frequency	Every 31 months	Every 3 months — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPad, iPod, Mac — better	iPhone, iPod
Requires iOS	14.0	11.0 — better
Further details — not scored
Size	8 MB	30 MB
Age rating	4+	4+
Developer	Mikhail Fedorov	小宁冯

In-app purchases

None

Theta

No in-app purchases

None

XY BMS

No in-app purchases

Questions

Is Theta free?

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

Is XY BMS free?

XY BMS is free to download, with no in-app purchases.

Do Theta or XY BMS have ads?

Neither Theta nor XY BMS shows ads.

Which is updated more often, Theta or XY BMS?

Theta ships an update every 31 months, and XY BMS every 3 months. Most recently, Theta was updated on October 27, 2026 and XY BMS on October 27, 2026.