Comparison

Spirit Level smart vs HM01

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

Head to head

Spirit Level smart

Measure horizontally angles.

About

Spirit Level smart

Features

Read full description

Spirit level. Hold the device horizontally and press it against an object. Displays the angle of inclination. Make minor adjustments in advance to accommodate the unique tilt caused by the device's protrusions and case.

About

HM01

Features

Read full description

This is an application for real-time image transmission and operation control of aircraft through wifi connection. It can take photos and videos remotely. It can also control the movement of the drone in real time, and there are many interesting ways to play

Screenshots

Spirit Level smart4 screens

HM012 screens

Verdict

The call

The clearest difference is in-app purchases: HM01 at none against Spirit Level smart's 1. HM01 also leads on update cadence (fortnightly vs every 2 months) and iOS requirement (12.0 vs 15.6). On price, ads and device support 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. Spirit Level smart sells 1 one-off in-app purchase. HM01 asks for nothing beyond the download.

UpkeepUpdate frequency

Spirit Level smart ships an update every 2 months, HM01 fortnightly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 3 level

Spirit Level smart versus HM01: the parameters behind the verdict, then further details
Parameter	Spirit Level smart	HM01
Price	Free	Free
Update frequency	Every 2 months	Fortnightly — better
Ads	No	No
In-app purchases	Yes	No — better
Devices	iPhone, iPad, iPod — better	iPhone, iPod
Requires iOS	15.6	12.0 — better
Further details — not scored
Size	24 MB	115 MB
Age rating	4+	4+
Developer	akira ohmachi	ShanTou City Vison Electronictechnology Co., Ltd.

In-app purchases

1 purchases

Spirit Level smart

One-time1

Remove Ads$1.99

None

HM01

No in-app purchases

Questions

Is Spirit Level smart free?

Spirit Level smart is free to download, with in-app purchases available.

Is HM01 free?

HM01 is free to download, with no in-app purchases.

Do Spirit Level smart or HM01 have ads?

Neither Spirit Level smart nor HM01 shows ads.

Which is updated more often, Spirit Level smart or HM01?

Spirit Level smart ships an update every 2 months, and HM01 fortnightly. Most recently, Spirit Level smart was updated on November 4, 2026 and HM01 on October 30, 2026.