Comparison

Chrono vs Nidoria

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

Head to head
About

Chrono

Features
Read full description

Chrono is a sleep tracker built on one idea: tracking your sleep should be simple. No complicated data. A cute companion joins your sleep journey. But first, let's find out which one is yours. DISCOVER YOUR CHRONOTYPE - Find your natural sleep rhythm - It wakes up with you every morning. Sleep well and it shows WORKS WITHOUT APPLE WATCH - Turn on Sleep Focus before bed and you are good to go - No need to keep your phone on all night - Have an Apple Watch? Even better. Detailed sleep stages included LEARN ABOUT YOUR SLEEP - 7-day guided journey with sleep science - Daily lessons personalized to your chronotype - Understand why you sleep the way you do Your little friend is waiting for you :) Try Chrono free for 7 days and then get Chrono Premium for $4.99/mo ($29.99/yr) Terms of Use & Privacy Policy: https://leonardobilhalva.github.io/chrono-legal-docs/

About

Nidoria

This app tracks sleep quality using phone sensors, providing detailed sleep stage analysis and a daily sleep score. It offers soothing sounds, smart alarms, and motivational tools to help users improve their sleep habits and wake up refreshed.

Highlights
  • Automatic sleep tracking without wearables
  • Sleep stage classification (Awake, Light, Deep, REM)
  • Daily Sleep Score (0-100)
  • Soothing sleep sounds library
  • Smart alarm for gentle wake-ups
  • Sleep reports and history
  • Bedtime reminders and streaks
Features
Read full description

Nidoria — Sleep Better Every Night Track your sleep, drift off to soothing sounds, and wake refreshed with a Smart Alarm that knows the perfect moment to wake you. WHY NIDORIA Most sleep apps just count hours. Nidoria measures quality. Using motion and audio sensors, we classify every stage of your night — Awake, Light, Deep, and REM — then turn it into a Sleep Score you can actually act on. FREE FEATURES Automatic Sleep Tracking • One-tap session start — place phone on bed, sleep, wake up to insights • Motion + audio detection classifies sleep stages with no wearable needed • Sleep Score (0–100) for every night over 30 minutes • Live session timer with discard option for false starts Sleep Sounds • Six categories: Rain, ASMR, Healing, Meditation, Nature, Noise • A selection of sounds is free — premium tracks unlock with Nidoria Premium, or unlock an individual track by watching a short ad • Favorites playlist and background playback during sleep sessions Sleep Reports • Nightly breakdown: score, duration, start and wake times • Full session history — browse any past night • Visual sleep stage timeline Streaks & Motivation • Track consecutive sleep-tracked nights • Milestone rewards at 3, 7, 14, and 30+ days • Weekly calendar view and longest streak record Bedtime Reminders • Custom wind-down notifications 10, 20, or 30 minutes before bed • Onboarding survey personalizes recommendations Privacy First • Guest mode — full tracking without an account • Local data storage with optional cloud sync • No data sold, ever NIDORIA PREMIUM — requires a paid subscription (in-app purchase) Upgrade to unlock: • Smart Alarm — wakes you during light sleep within a 15–30 minute window; custom bedtime + wake schedule with weekday repeat; full-screen alarm with snooze and dismiss • Unlimited Premium Sounds — full access to every sound, no ad needed to unlock • Ad-free experience — removes all ads • Advanced Sleep Insights — 7-day duration and deep-sleep trend charts PERFECT FOR • Light sleepers seeking gentler wake-ups • Anyone tracking sleep without a wearable • ASMR, rain, and meditation sound lovers • Habit-builders who love streaks • Insomniacs, students, parents, shift workers Download Nidoria. Sleep smarter tonight. Privacy Policy: https://appaspect.com/apps/nidoria-sleeptracker/terms.html
 Terms of Use: https://appaspect.com/apps/nidoria-sleeptracker/privacy-policy.html

Screenshots

Chrono4 screens
Nidoria4 screens

Verdict

The call

The clearest difference is ads: Chrono at none against Nidoria's shown. Chrono also leads on update cadence (every 3 days vs every 2 months). Nidoria's advantage is iOS requirement (15.0 vs 18.6). On price, 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. Chrono sells 6 in-app purchases, starting at $4.99 per month and Nidoria sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Chrono ships an update every 3 days, Nidoria every 2 months. Both last shipped on October 31, 2026.

Scorecard3 real differences · 6 level
Chrono versus Nidoria: the parameters behind the verdict, then further details
ParameterChronoNidoria
PriceFreeFree
Rating—1.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 3 days — betterEvery 2 months
AdsNo — betterYes
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhoneiPhone, iPod — better
Requires iOS18.615.0 — better
Further details — not scored
Size582 MB159 MB
Age rating4+12+
DeveloperLeonardo Barros BilhalvaAppAspect Technologies Pvt. Ltd.

In-app purchases

6 purchases

Chrono

Subscriptions6
  • Chrono Premium - Monthly7 Days trial$4.991 Month
  • Chrono Premium - Monthly$4.991 Month
  • Chrono Premium - Annual 60% Off$11.991 Year
Show 3 more
  • Chrono Premium - Annual7 Days trial$20.991 Year
  • Chrono Premium - Annual$20.991 Year
  • Chrono Premium - Annual7 Days trial$29.991 Year
2 purchases

Nidoria

Subscriptions2
  • Monthly Premium Subscription$4.991 Month
  • Yearly Premium Subscription$14.991 Year

Questions

Is Chrono free?
Chrono is free to download, with in-app purchases available.
Is Nidoria free?
Nidoria is free to download, with in-app purchases available.
Do Chrono or Nidoria have ads?
Nidoria shows ads; Chrono does not.
Which is updated more often, Chrono or Nidoria?
Chrono ships an update every 3 days, and Nidoria every 2 months. Most recently, Chrono was updated on October 31, 2026 and Nidoria on October 31, 2026.

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