Comparison

Sleep Light Pro vs Constant Scale

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

Head to head
About

Sleep Light Pro

Drift off to sleep with calming animations and sounds designed to mimic natural light. The app gradually fades brightness and sound to match your sleep pattern, offering a simple interface and a full night clock option.

Highlights
  • Northern Light style animations
  • Optional relaxing sounds
  • Gradual fade of sound and brightness
  • Customizable sleep preferences
  • Full night clock option
  • Simple interface
Features
Read full description

Sleep easy with relaxing Northern Light style animations and optional relaxing sounds. Brightness will gradually fade at a rate that suits you and your sleeping pattern. FEATURES ● Choose from animations or static themes ● Optional sounds like birds or crickets ● Gradual reduction in sound and brightness set to your sleeping preferences ● Simple Interface ● Full night clock option ● Free to download & use INSTRUCTIONS 1. Simply choose your preferences 2. Select ‘Activate Alarm’ 3. Then have a great nights sleep THANKS Photos (derivative versions) in App are used under Creative Commons (Flickr) from: MikeBaird (Yellow-rumped Warbler) Mollie Emm (Wind-chimes) Feans (Macro Grilo Cricket) Natalielucier (Bonfire on the beach) Nickpestov (Wave) Robin_24 (Rain drop) Nicholas_T's (Conduit) Scazon (Seagull) Kyknoord (MentalState) Lawrence Murray (Wind Farm Panorama) Hosiawak (Didgeridoo) Jerrroen (Kitten) App uses sound files by Freesound (http://www.freesound.org): Evening in the forest by Reinsamba Chimes by DJ Chronos Merloth Park crickets by Reinsamba Fire embers large campfire by Dynamicell Ocean by Slanesh Ambient - Rain on Forest Canopy by Arctura Small eddy on a river by Volivieri Seagulls by Inchadney 01 Noise by Toine Wind by ERH Didgeridoo by Sandyrb Domestic Cat Purr by Hell's Sound Guy Alarm Clock by Jackstrebor DISCLAIMER INFORMATION Keep the device a reasonable distance from users while sleeping. This will help ensure the sounds are not too loud, the light not too bright, etc. Ensure you plug your device into power when using this app overnight to ensure you do not run low on batteries. LIMITATION OF LIABILITY By downloading this app you are agreeing to the following: You acknowledge that, Seligman Ventures Ltd cannot and does not assume any responsibility for, and shall not be liable for, any damages or expenses you may incur as a result of any inaccuracy, incompleteness or obsolescence of any information or functionality contained in this app. You agree that Seligman Ventures Ltd will not be liable to you or to any other party for any direct or indirect damages, or for any special, exemplary, punitive, incidental, consequential or other damages (including, but not limited to, lost profits or lost time), whether based on contract, tort, strict liability or otherwise, which arise out of or are in any way connected with any access to this app.

About

Constant Scale

Features
Read full description

Software introduction: This kind of application can transmit data to electronic scale, which contributes great help to healthy life. Users can easily manage their own personal health data anytime and anywhere. Key functions: 1)Data transmission from software to scale through Bluetooth. 2)Automatically transmit and save personal health data. 3)Automatically judge the standard of personal health data. 4)Automatically create personal health data graph. 5)Support save health data to Apple's health kit 6) support cloud cache data 7) suport french,german,italian,korean,portuguese,turkish,russian,spanish

Screenshots

Sleep Light Pro4 screens
Constant Scale4 screens

Verdict

The call

The clearest difference is update cadence: Constant Scale at every 4 weeks against Sleep Light Pro's every 14 months. Sleep Light Pro's advantage is iOS requirement (8.0 vs 11.0). 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

Sleep Light Pro ships an update every 14 months, Constant Scale every 4 weeks. The most recent releases landed on September 23, 2026 and September 30, 2026 respectively.

Scorecard2 real differences · 8 level
Sleep Light Pro versus Constant Scale: the parameters behind the verdict, then further details
ParameterSleep Light ProConstant Scale
PriceFreeFree
Rating4.7 (3 ratings) — better—
Positive reviews66.7% of reviews—
Number of ratings3 — better—
Update frequencyEvery 14 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS8.0 — better11.0
Further details — not scored
Size26 MB150 MB
Age rating4+4+
DeveloperSeligman Ventures Global LimitedYiwu Chaolan Import & Export Co., Ltd.

In-app purchases

None

Sleep Light Pro

No in-app purchases

None

Constant Scale

No in-app purchases

Questions

Is Sleep Light Pro free?
Sleep Light Pro is free to download, with no in-app purchases.
Is Constant Scale free?
Constant Scale is free to download, with no in-app purchases.
Do Sleep Light Pro or Constant Scale have ads?
Neither Sleep Light Pro nor Constant Scale shows ads.
Which is updated more often, Sleep Light Pro or Constant Scale?
Sleep Light Pro ships an update every 14 months, and Constant Scale every 4 weeks. Most recently, Sleep Light Pro was updated on September 23, 2026 and Constant Scale on September 30, 2026.

Other comparisons