# Projecta BM500 vs SDT Calculator 速距時計算機

The clearest difference is update cadence: SDT Calculator 速距時計算機 at daily against Projecta BM500's every 7 months. Projecta BM500's advantage is iOS requirement (13.0 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.

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

Projecta BM500 ships an update every 7 months, SDT Calculator 速距時計算機 daily. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Projecta BM500 | SDT Calculator 速距時計算機 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Daily** |
| Monetization | Free | — |
| Size | 24 MB | 14 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TBB Power Co., Ltd](https://appshunter.io/developer/1089239531) | [Lap Tak Cheung](https://appshunter.io/developer/557168864) |

## What reviewers say

### Projecta BM500

[App page](https://appshunter.io/ios/app/projecta-bm500-bt/id1619339633)

This kit allows users to monitor their battery systems, displaying key information like current, voltage, state of charge, and remaining time. It is compatible with various battery types and voltages, offering accurate measurements for a comprehensive understanding of battery health.

**Highlights:** Real-time current monitoring up to 500A, Supports 12V, 24V, or 48V DC battery systems, Compatible with AGM, GEL, and LFP batteries, Displays voltage, SOC, and time remaining, Accurate current (+/- 0.4%) and voltage (+/- 0.3%) measurements

**In-app purchases:** none


### SDT Calculator 速距時計算機

[App page](https://appshunter.io/ios/app/sdt-calculator/id6767132226)

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

**In-app purchases:** none


## Frequently asked questions

### Is Projecta BM500 free?

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

### Is SDT Calculator 速距時計算機 free?

SDT Calculator 速距時計算機 is free to download, with no in-app purchases.

### Do Projecta BM500 or SDT Calculator 速距時計算機 have ads?

Neither Projecta BM500 nor SDT Calculator 速距時計算機 shows ads.

### Which is updated more often, Projecta BM500 or SDT Calculator 速距時計算機?

Projecta BM500 ships an update every 7 months, and SDT Calculator 速距時計算機 daily. Most recently, Projecta BM500 was updated on October 11, 2026 and SDT Calculator 速距時計算機 on October 24, 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.*