# NDST550A vs E.C.A. Poly Smart

NDST550A and E.C.A. Poly Smart are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | NDST550A | E.C.A. Poly Smart |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 4 months |
| Monetization | — | Free |
| Size | 39 MB | 172 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guangzhou Aidan Blessindo Electronic Co.,Ltd.](https://appshunter.io/developer/1413008258) | [EMAS MAKINA SANAYI ANONIM SIRKETI](https://appshunter.io/developer/1745114760) |

## What reviewers say

### NDST550A

[App page](https://appshunter.io/ios/app/ndst550a/id6449562064)

**Features:** macOS Compatibility

**In-app purchases:** none


### E.C.A. Poly Smart

[App page](https://appshunter.io/ios/app/eca-poly-smart/id6476879062)

Control your home's heating remotely with this smart thermostat application. Set custom schedules, monitor temperature with open window detection, and save on energy bills. Manage multiple properties and share access with family members.

**Highlights:** Remote temperature control, Daily and weekly scheduling, Open window detection, Multiple home management, Family sharing, Comfort, Economy, Holiday modes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NDST550A free?

NDST550A is free to download, with no in-app purchases.

### Is E.C.A. Poly Smart free?

E.C.A. Poly Smart is free to download, with no in-app purchases.

### Do NDST550A or E.C.A. Poly Smart have ads?

Neither NDST550A nor E.C.A. Poly Smart shows ads.

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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.*