Comparison

Syncly vs ERTH

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

Head to head
About

Syncly

Features
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Stop fighting your biology. Work when you're wired, rest when you're tired. Drag cards to rearrange your day. Society is built for morning people. But what if you're a Wolf who wakes up at noon, a Dolphin who never sleeps deeply, or a Bear stuck in 3 PM brain fog? Syncly is the world's first calendar powered by your real circadian rhythm โ€” not a generic 9-to-5 template. Take the 60-second Chronotype Quiz and finally discover your biological prime time. WHY SYNCLY WILL CHANGE YOUR LIFE - Discover Your Animal: Are you a Bear, Lion, Wolf, or Dolphin? Get a personalized energy report based on real chronobiology research. - The Energy Wave: A visual map showing exactly when your brain peaks, when you crash, and when your creative window opens. - Smart Calendar Sync: Overlay your Apple Calendar and Google Calendar events onto your energy curve. See conflicts before they ruin your day. - Slump Warnings: Never schedule a high-stakes meeting during your 3 PM brain fog again. Syncly nudges you to move it. - Deep Work Protection: Auto-block your peak hours so genius time stays sacred. - Drag & Drop Schedule: Rearrange cards anytime to keep your day in sync with your energy. BUILT FOR PRODUCTIVITY 2.0 Perfect for founders, creators, students, remote workers, biohackers, and anyone with ADHD who needs to ride their energy wave instead of fighting it. Whether you call it chronotype, biorhythm, energy management, or time blocking โ€” Syncly turns the science of when into a daily habit. SYNCLY PRO Unlock auto-rescheduling, advanced biorhythm analytics, custom energy alerts, unlimited calendar connections, and Focus Mode shortcuts. Try free for 7 days โ€” cancel anytime. Start syncing with your real biology today. Your best hours are waiting.

About

ERTH

Features
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์ธ์Šคํƒ€๊ทธ๋žจ์—์„œ ์‚ฌ๋žŒ์„ ํŒ”๋กœ์šฐํ•˜๋ฉด ๊ทธ ์‚ฌ๋žŒ์˜ ํ”ผ๋“œ๊ฐ€ ๋ณด์ด๋“ฏ, ERTH์—์„œ๋Š” ์‚ฌ๋žŒ์„ ํŒ”๋กœ์šฐํ•˜๋ฉด ๊ทธ ์‚ฌ๋žŒ์ด ์ €์žฅํ•œ ๋ง›์ง‘๊ณผ ๋‹จ๊ณจ ์žฅ์†Œ๊ฐ€ ์ง€๋„์— ๋‚˜ํƒ€๋‚ฉ๋‹ˆ๋‹ค. ์นœ๊ตฌ๊ฐ€ ์ž์ฃผ ๊ฐ€๋Š” ์นดํŽ˜๋Š” ์–ด๋””์ธ์ง€, ๋ง›์ž˜์•Œ ์ง€์ธ์ด ์ €์žฅํ•ด๋‘” ์‹๋‹น์€ ์–ด๋””์ธ์ง€, ์—ฌํ–‰์„ ์ข‹์•„ํ•˜๋Š” ์‚ฌ๋žŒ์ด ์ถ”์ฒœํ•˜๋Š” ์ˆ™์†Œ๋Š” ์–ด๋””์ธ์ง€ ์ด์ œ ๊ฒŒ์‹œ๋ฌผ์„ ํ•˜๋‚˜์”ฉ ์ฐพ์•„๋ณด์ง€ ๋ง๊ณ  ์ง€๋„์—์„œ ํ™•์ธํ•ด๋ณด์„ธ์š”. ERTH(์–ด์Šค)๋Š” ๋‚ด๊ฐ€ ์ข‹์•„ํ•˜๋Š” ์žฅ์†Œ๋ฅผ ์ €์žฅํ•˜๊ณ , ์„œ๋กœ์˜ ์ทจํ–ฅ์„ ์ง€๋„๋กœ ๊ณต์œ ํ•˜๋Š” ์žฅ์†Œ ๊ธฐ๋ก ์•ฑ์ž…๋‹ˆ๋‹ค. ๋‚ด ๋ง›์ง‘ ์ง€๋„ ๋งŒ๋“ค๊ธฐ ์ž์ฃผ ๊ฐ€๋Š” ์นดํŽ˜, ๋‹ค์‹œ ์ฐพ๊ณ  ์‹ถ์€ ์‹๋‹น, ์—ฌํ–‰ ์ค‘ ๋ฐœ๊ฒฌํ•œ ์ˆ™์†Œ๋ฅผ ์ง€๋„์— ์ €์žฅํ•˜์„ธ์š”. ์นดํ…Œ๊ณ ๋ฆฌ์™€ ๋ณ„์ , ๋ฉ”๋ชจ๋ฅผ ํ•จ๊ป˜ ๋‚จ๊ธธ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๊ฐ€๋ณธ ๊ณณ๊ณผ ๊ฐ€๊ณ  ์‹ถ์€ ๊ณณ ๊ตฌ๋ถ„ํ•˜๊ธฐ ์ด๋ฏธ ๋ฐฉ๋ฌธํ•œ ๋ง›์ง‘๊ณผ ์•ž์œผ๋กœ ๊ฐ€๋ณด๊ณ  ์‹ถ์€ ์žฅ์†Œ๋ฅผ ์„œ๋กœ ๋‹ค๋ฅธ ํ•€์œผ๋กœ ๊ด€๋ฆฌํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋ณ„์ ๊ณผ ๋ฉ”๋ชจ ๋‚จ๊ธฐ๊ธฐ ๊ทธ ์นดํŽ˜๋ฅผ ์ข‹์•„ํ–ˆ๋˜ ์ด์œ , ๋‹ค์‹œ ์ฃผ๋ฌธํ•˜๊ณ  ์‹ถ์€ ๋ฉ”๋‰ด๊นŒ์ง€ ๊ธฐ๋กํ•ด๋‘์„ธ์š”. ์นœ๊ตฌ์˜ ์ทจํ–ฅ ํŒ”๋กœ์šฐํ•˜๊ธฐ ์นœ๊ตฌ๋ฅผ ํŒ”๋กœ์šฐํ•˜๋ฉด ์นœ๊ตฌ๊ฐ€ ์ €์žฅํ•œ ๋ง›์ง‘์ด ๋‚ด ์ง€๋„์— ํ•จ๊ป˜ ๋‚˜ํƒ€๋‚ฉ๋‹ˆ๋‹ค. ์นœ๊ตฌ๊ฐ€ ์ž์ฃผ ๊ฐ€๋Š” ์นดํŽ˜๋Š” ์–ด๋””์ธ์ง€, ๋ง›์ž˜์•Œ ์ง€์ธ์˜ ์ธ์ƒ ๋ง›์ง‘์€ ์–ด๋””์ธ์ง€, ์ด์ œ ๊ฒŒ์‹œ๋ฌผ์„ ํ•˜๋‚˜์”ฉ ์ฐพ์•„๋ณผ ํ•„์š”๊ฐ€ ์—†์Šต๋‹ˆ๋‹ค. ์žฅ์†Œ ๊ฒ€์ƒ‰๊ณผ ๊ฒฝ๋กœ ํ™•์ธ ์ƒˆ๋กœ์šด ์žฅ์†Œ๋ฅผ ๊ฒ€์ƒ‰ํ•˜๊ณ , ์ €์žฅํ•œ ๋ง›์ง‘๊นŒ์ง€์˜ ๊ฒฝ๋กœ๋„ ๊ฐ„ํŽธํ•˜๊ฒŒ ํ™•์ธํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์ง€๋„์— ํ‘œ์‹œ๋œ ํ•€์„ ๋”ฐ๋ผ๊ฐ€๋‹ค ๋ณด๋ฉด ๊ฒ€์ƒ‰์ด๋‚˜ ๊ด‘๊ณ ๋งŒ์œผ๋กœ๋Š” ์ฐพ๊ธฐ ์–ด๋ ค์› ๋˜ ์ƒˆ๋กœ์šด ๋ง›์ง‘์„ ๋ฐœ๊ฒฌํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์นœ๊ตฌ์˜ ๋‹จ๊ณจ ์นดํŽ˜, ์ง€์ธ์˜ ์ธ์ƒ ๋ง›์ง‘, ์—ฌํ–‰ ์ค‘ ๋‹ค์‹œ ๊ฐ€๊ณ  ์‹ถ์€ ์ˆ™์†Œ๊นŒ์ง€ ERTH์— ์ €์žฅํ•ด๋ณด์„ธ์š”.

Screenshots

Syncly4 screens
ERTH4 screens

Verdict

The call

The clearest difference is in-app purchases: ERTH at none against Syncly's 1. ERTH also leads on update cadence (every 10 days vs every 5 weeks) and iOS requirement (15.0.0 vs 17.6). On price, ads and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Syncly sells 1 one-off in-app purchase. ERTH asks for nothing beyond the download.

UpkeepUpdate frequency

Syncly ships an update every 5 weeks, ERTH every 10 days. The most recent releases landed on September 28, 2026 and October 12, 2026 respectively.

Scorecard3 real differences ยท 3 level
Syncly versus ERTH: the parameters behind the verdict, then further details
ParameterSynclyERTH
PriceFreeFree
Update frequencyEvery 5 weeksEvery 10 days โ€” better
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhoneiPhone, iPod โ€” better
Requires iOS17.615.0.0 โ€” better
Further details โ€” not scored
Size5 MB71 MB
Age rating4+4+
Developerๅ‘ไบฎ ๅˆ˜Hyun Seok Kim

In-app purchases

1 purchases

Syncly

One-time1
  • PRO Lifetime$3.99
None

ERTH

No in-app purchases

Questions

Is Syncly free?
Syncly is free to download, with in-app purchases available.
Is ERTH free?
ERTH is free to download, with no in-app purchases.
Do Syncly or ERTH have ads?
Neither Syncly nor ERTH shows ads.
Which is updated more often, Syncly or ERTH?
Syncly ships an update every 5 weeks, and ERTH every 10 days. Most recently, Syncly was updated on September 28, 2026 and ERTH on October 12, 2026.

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