Comparison

SunNow vs Sun Day Tracker

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

Head to head

SunNow

Smart sun exposure dosimeter

Track Your D

★ 4.626 ratingsView app →

About

SunNow

Features

Read full description

SunNow allow you to expose your self to the sun providing you with : - An assessment in real-time of the UV solar radiation - A personalised sun protection according to your skin sensitivity - An optimised sunscreen protection options for your sun exposure plan - Tracking of your sun exposure lifestyle to reduce skin damage risks SunNow® is an innovative App developed and powered by siHealth Ltd (www.sihealth.co.uk) for Aethic Ltd (www.aethic.com). SunNow is optimised for Aethic sunscreens.

About

Sun Day Tracker

Monitor your daily vitamin D absorption from sunlight exposure. This straightforward application helps you keep track of your sun-related vitamin D intake.

Highlights

Track daily vitamin D intake
Sunlight exposure monitoring
Simple interface
Daily tracking

Features

Read full description

A simple app to track you daily vitamin D intake from the sun.

Screenshots

SunNow4 screens

Sun Day Tracker1 screens

Verdict

The call

The clearest difference is update cadence: SunNow at every 4 days against Sun Day Tracker's monthly. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SunNow ships an update every 4 days, Sun Day Tracker monthly. The most recent releases landed on September 28, 2026 and October 8, 2026 respectively.

Scorecard1 real difference · 9 level

SunNow versus Sun Day Tracker: the parameters behind the verdict, then further details
Parameter	SunNow	Sun Day Tracker
Price	Free	Free
Rating	—	4.6 (26 ratings) — better
Positive reviews	—	83.3% of reviews
Number of ratings	—	26 — better
Update frequency	Every 4 days — better	Monthly
Ads	No	No
In-app purchases	No	No
Monetization	—	Free
Devices	iPhone, Apple Watch — better	iPhone
Requires iOS	16.6 — better	17.0
Further details — not scored
Size	33 MB	1 MB
Age rating	17+	4+
Developer	siHealth Ltd.	permissionless tech, llc

In-app purchases

None

SunNow

No in-app purchases

None

Sun Day Tracker

No in-app purchases

Questions

Is SunNow free?

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

Is Sun Day Tracker free?

Sun Day Tracker is free to download, with no in-app purchases.

Do SunNow or Sun Day Tracker have ads?

Neither SunNow nor Sun Day Tracker shows ads.

Which is updated more often, SunNow or Sun Day Tracker?

SunNow ships an update every 4 days, and Sun Day Tracker monthly. Most recently, SunNow was updated on September 28, 2026 and Sun Day Tracker on October 8, 2026.