Comparison

TBB BM500 vs Zeliox ZAI4

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

Head to head

About

TBB BM500

Features

Read full description

TBB'battery monitor kit is composed by a battery shunt and a monitor which allow the user to fully understand his/her battery. Here is some quick facts of this kit: 1) Measurement current is up to 500A 2) Is able to work with battery (or battery bank) 12Vdc, 24Vdc or 48Vdc 3) Compatible with AGM, GEL or LFP battery 4) An elegant design monitor to display battery information such as current, voltage, SOC, time remaining etc. 5) The monitor could be installed at any location where with easy access to users 6) Measurement accuracy: Current: +/- 0.4% Voltage: +/- 0.3%

About

Zeliox ZAI4

Features

Read full description

This APP is designed for Zeliox products to: 1) help users know the device status and data in real time; 2) provide the latest firmware and configuration file; 3) provide wider usage for Zeliox products. Overall, this APP will be a great tool for you to use your Zeliox products. We hope you will always enjoy using Zeliox products.

Screenshots

TBB BM5004 screens

Zeliox ZAI43 screens

Verdict

The call

TBB BM500 and Zeliox ZAI4 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

TBB BM500 ships an update every 6 months, Zeliox ZAI4 every 7 months. The most recent releases landed on May 17, 2026 and September 7, 2026 respectively.

ScorecardNo meaningful differences

TBB BM500 versus Zeliox ZAI4: the parameters behind the verdict, then further details
Parameter	TBB BM500	Zeliox ZAI4
Price	Free	Free
Update frequency	Every 6 months — better	Every 7 months
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPod	iPhone, iPod
Requires iOS	11.0 — better	12.0
Further details — not scored
Size	31 MB	34 MB
Age rating	4+	17+
Developer	TBB Power Co., Ltd	Zeliox

In-app purchases

None

TBB BM500

No in-app purchases

None

Zeliox ZAI4

No in-app purchases

Questions

Is TBB BM500 free?

TBB BM500 is free to download, with no in-app purchases.

Is Zeliox ZAI4 free?

Zeliox ZAI4 is free to download, with no in-app purchases.

Do TBB BM500 or Zeliox ZAI4 have ads?

Neither TBB BM500 nor Zeliox ZAI4 shows ads.

Which is updated more often, TBB BM500 or Zeliox ZAI4?

TBB BM500 ships an update every 6 months, and Zeliox ZAI4 every 7 months. Most recently, TBB BM500 was updated on May 17, 2026 and Zeliox ZAI4 on September 7, 2026.