Comparison

StudyCal vs PIECE

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

Head to head
About

StudyCal

Features
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How many days until the exam? What should you study today? StudyCal is a study calendar that turns your plans into today's to-do list. Check a plan off and your study time adds up automatically. Exam countdowns, home screen widgets, a streak heatmap, a focus timer and more than 50 achievement badges are all included. No sign-in needed. With Pro+, you can reschedule missed plans in one tap, see your pace toward exam day, sync between iPhone and iPad, and share your progress with a parent. StudyCal brings your study plans, timetable, to-do list and study time tracking together in one simple app for middle school, high school and exam students. Plans you add appear on that day's to-do list, and a single tap marks them done. Subjects are color-coded, and your study time is shown in charts. โ–  Made for - Students who want to keep studying every day - Anyone tired of using separate apps for a timetable and a to-do list - Students preparing for exams who want to see time spent on each subject - Anyone who wants to add weekly recurring classes in seconds โ–  Main features - Today's to-do: today's study plans in one list, with your completion rate at a glance - Calendar: switch between month, week, day and list views in one tap. Color-coded subjects and recurring plans - Timetable: the week view works as a timetable (any number of periods) - Quick plans: pick a subject and a type, and the title fills in for you - Recurring plans: every week on one or more days, with an end date. Automatic numbering such as "Lesson 1, Lesson 2, Lesson 3..." - Check off: tap the circle to finish a plan; it goes straight into your totals - Stats: weekly, monthly and yearly study time in stacked bar charts, with a breakdown by subject - Materials and bookshelf: attach textbooks and workbooks to your plans and see the study time for each one (icon-only materials are unlimited; up to 5 with photos for free) - Plan types: homework, preview, review, past exams, drills, workbooks and more (add your own) - Export to your iPhone calendar or Google Calendar - Automatic backup: once a day, your plans, records, settings and photos are backed up, including to iCloud, so you can restore them on a new device (free; keeping several devices in sync is Pro+) - Sharing with a parent (Pro+): once the student approves, a parent can see study time, time per subject, streak days and completion rate on their own phone. Plan names and notes are never sent. Parents can send stamps and short messages - Exam countdown: add an exam date to see the days left on the home tab and on widgets - Widgets: check today's to-do list and the days until your exam from the home screen - Streaks and badges: see the days you studied on a heatmap and collect badges as you keep going - Focus timer: a Pomodoro-style timer that alternates focus and breaks - No sign-in needed โ–  Easy to start StudyCal needs no account and no sign-in. Your study records stay on your iPhone or iPad and in your own iCloud. Study totals are sent only when you use sharing with a parent. โ–  Optional upgrades - StudyCal Pro (one-time purchase): app colors, calendar background photos, unlimited material photos, widget colors and background images, rewards, focus timer styles and custom stamps - StudyCal Pro+ (auto-renewing monthly or yearly subscription): reschedule missed plans, iPhone and iPad sync, pace toward exam day, past weekly reports, monthly reports, exam reviews and sharing with a parent (a parent can see up to 6 children if the parent subscribes). Includes everything in Pro All the basic features, including plans, to-do lists and stats, work without upgrading. Pro+ renews automatically unless canceled at least 24 hours before the end of the current period. You can cancel anytime from your subscription settings. Terms of Use: https://kazutaka.biz/kiyaku/ Privacy Policy: https://kazutaka.biz/privacy/

About

PIECE

Features
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ๅ‚่€ƒๆ›ธใฎ็›ฎๆฌกใฎ1่กŒใ‚’ใ€1ๅ›žใงใ“ใชใ›ใ‚‹ใ€Œใƒ”ใƒผใ‚นใ€ใซใ™ใ‚‹ใ€‚ ๆ•™ๆใ”ใจใฎๆตใ‚Œใงใ€ไธŠใ‹ใ‚‰้ †ใซ้€ฒใ‚ใฆใ„ใใŸใ‚ใฎใ‚ฟใ‚นใ‚ฏ็ฎก็†ใงใ™ใ€‚ โ–  ็›ฎๆฌกใ‚’ๆ’ฎใ‚‹ใจใ€่กŒใŒใใฎใพใพใƒ”ใƒผใ‚นใซใชใ‚‹ ๅ‚่€ƒๆ›ธใฎ็›ฎๆฌกใ‚’ๆ’ฎใ‚‹ใจใ€็ซ ใจ็ฏ€ใ‚’่ชญใฟๅ–ใฃใฆใใฎใพใพไธฆในใพใ™ใ€‚ ่กŒใฎ1ใค1ใคใŒใƒ”ใƒผใ‚นใงใ€็ซ ใฎใพใจใพใ‚Šใ‚’ใƒ”ใƒผใ‚นใซใ™ใ‚‹ใ“ใจใ‚‚ใ€ ใใฎไธ‹ใฎ้ …็›ฎใ ใ‘ใ‚’ใƒ”ใƒผใ‚นใซใ™ใ‚‹ใ“ใจใ‚‚ใงใใพใ™ใ€‚ ่ชญใฟๅ–ใฃใŸใ‚ใจใซๆ‰“ใก็›ดใ™ใƒป้ †็•ชใ‚’ๅ…ฅใ‚Œๆ›ฟใˆใ‚‹ใƒป่กŒใ‚’่ถณใ™ใƒปๅˆ†ใ‘ใ‚‹ใŒใงใใพใ™ใ€‚ ๆ’ฎใ‚‰ใšใซๆ‰‹ใงๅ…ฅใ‚Œใ‚‹ใ“ใจใ‚‚ใงใใพใ™ใ€‚ โ–  ๆ•™ๆใ”ใจใฎๆตใ‚Œใง้€ฒใ‚€ ้–‹ใใจใ€ๆ•™ๆใ”ใจใฎๆตใ‚ŒใŒไธฆใณใพใ™ใ€‚ ไธŠใŒ็ต‚ใˆใŸใถใ‚“ใ€ใใฎไธ‹ใŒ้€ฒใ‚ใฆใ„ใ‚‹ใถใ‚“ใ€ใ•ใ‚‰ใซไธ‹ใŒใ“ใ‚Œใ‹ใ‚‰ใฎใ‚‚ใฎใงใ™ใ€‚ ใƒ”ใƒผใ‚นใ‚’ๆŠผใ—ใฆใ€Œๅง‹ใ‚ใ‚‹ใ€ใ€็ต‚ใˆใŸใ‚‰ใ€ŒๅฎŒไบ†ใซใ™ใ‚‹ใ€ใ€‚ 1ๆžšใŒๅคงใใ™ใŽใŸใ‚‰ใ€ใใฎๅ ดใงไฝ•ๆžšใ‹ใซๅˆ†ใ‘ใ‚‰ใ‚Œใพใ™ใ€‚ ใ‚ขใƒ—ใƒชใŒๅ‹ๆ‰‹ใซ้‡ใ‚’ๆฑบใ‚ใ‚‹ใ“ใจใฏใ‚ใ‚Šใพใ›ใ‚“ใ€‚ๅคงใใ•ใ‚’ๆฑบใ‚ใ‚‹ใฎใฏใ‚ใชใŸใงใ™ใ€‚ โ–  ๆœŸ้™ใฏไป˜ใ‘ใฆใ‚‚ไป˜ใ‘ใชใใฆใ‚‚ใ„ใ„ ๆ—ฅไป˜ใ‚’ๆฑบใ‚ใชใใฆใ‚‚ใ€ใƒ”ใƒผใ‚นใฏๅง‹ใ‚ใ‚‰ใ‚Œใพใ™ใ€‚ ๆœŸ้™ใ‚’ไป˜ใ‘ใ‚‹ใจๆœญใซๆ—ฅไป˜ใŒๅ‡บใฆใ€ๆฎ‹ใ‚Šใฏใ€Œ-3ๆ—ฅใ€ใ€้ŽใŽใŸใถใ‚“ใฏใ€Œ+8ๆ—ฅใ€ใง่ฆ‹ใˆใพใ™ใ€‚ ๆœŸ้™ใ‚’ไป˜ใ‘ใŸๆ—ฅใฎๆœใซ้€š็ŸฅใŒๅฑŠใใพใ™๏ผˆ่จญๅฎšใงๅˆ‡ใ‚Œใพใ™๏ผ‰ใ€‚ ๆ‰‹ใ‚’ๆญขใ‚ใ‚‹ใจใใฏใ€Œไผ‘ๆญขใ™ใ‚‹ใ€ใงใ€ใพใ ๆ‰‹ใ‚’ไป˜ใ‘ใฆใ„ใชใ„็Šถๆ…‹ใซๆˆปใ›ใพใ™ใ€‚ โ–  ไฝ•ๅ‘จใ‹ใ™ใ‚‹ๆ•™ๆ 1ๅ‘จใง็ต‚ใ‚ใ‚‰ใชใ„ๆ•™ๆใฏใ€ใƒ”ใƒผใ‚นใ‚’1ๆžš็ต‚ใˆใ‚‹ใŸใณใซๆฌกใฎๅ‘จใฎ1ๆžšใŒ็”จๆ„ใ•ใ‚Œใพใ™ใ€‚ 1ๅ‘จใถใ‚“ใ‚’ๅ…จ้ƒจ็ต‚ใˆใฆใ‹ใ‚‰ใพใจใ‚ใฆๆฌกใฎๅ‘จใซ้€ฒใ‚€ๅฝขใ‚‚้ธในใพใ™ใ€‚ ็›ฎๆจ™ใฎๅ‘จๅ›žใฏๆ•™ๆใ”ใจใซๆฑบใ‚ใ‚‰ใ‚Œใพใ™ใ€‚ โ–  ใƒ”ใƒผใ‚นใ”ใจใซ้›†ไธญใ‚’่จˆใ‚‹ 25ๅˆ†ใฎใ‚ฟใ‚คใƒžใƒผใ‚’ใ€ใ„ใพ้€ฒใ‚ใฆใ„ใ‚‹ใƒ”ใƒผใ‚นใซ็ตใณใคใ‘ใฆๅ›žใ›ใพใ™ใ€‚ ๆฎ‹ใ‚‹ใฎใฏๅ›žๆ•ฐใจใ„ใ†ไบ‹ๅฎŸใ ใ‘ใงใ€ๆ™‚้–“ใ‹ใ‚‰้€ฒใฟๅ…ทๅˆใ‚’ๆŽจๅฎšใ™ใ‚‹ใ“ใจใฏใ—ใพใ›ใ‚“ใ€‚ ใ‚ฟใ‚คใƒžใƒผใ‚’ไฝฟใ‚ใชใใฆใ‚‚ใ€ๅฎŒไบ†ใฏ่จ˜้Œฒใ•ใ‚Œใพใ™ใ€‚ โ–  AIใซ็›ธ่ซ‡ใงใใ‚‹ ็™ป้Œฒใ—ใŸๆ•™ๆใƒปใƒ”ใƒผใ‚นใƒปๆœŸ้™ใƒปใ“ใ‚Œใพใงใฎ่จ˜้Œฒใƒปๅฟ—ๆœ›ๆ กใƒปๆจก่ฉฆใ‚’่ฆ‹ใŸใ†ใˆใงใ€ ๆ–‡็ซ ใง็›ธ่ซ‡ใงใใพใ™ใ€‚่ถณใ‚Šใชใ„ใ“ใจใŒใ‚ใ‚Œใฐ่žใ่ฟ”ใ—ใฆใใพใ™ใ€‚ ๆœŸ้™ใ‚’ๅค‰ใˆใ‚‹ๆๆกˆใฏใ€ๅฏพ่ฑกใจๅค‰ๆ›ดๅ‰ๅพŒใŒไธ€่ฆงใงๅ‡บใพใ™ใ€‚ ๅๆ˜ ใ•ใ‚Œใ‚‹ใฎใฏใ€ๅ†…ๅฎนใ‚’็ขบใ‹ใ‚ใฆใ€ŒๅฎŸ่กŒใ™ใ‚‹ใ€ใ‚’ๆŠผใ—ใŸใจใใ ใ‘ใงใ™ใ€‚ ๅๆ˜ ใ—ใŸใ‚ใจใ‹ใ‚‰ๅ–ใ‚Šๆถˆใ›ใพใ™ใ€‚ไผš่ฉฑใฏใ‚ใจใง่ชญใฟ่ฟ”ใ›ใพใ™ใ€‚ ๅ‹ๆ‰‹ใซๆœŸ้™ใ‚„่จ˜้Œฒใ‚’ๆ›ธใๆ›ใˆใ‚‹ใ“ใจใฏใ‚ใ‚Šใพใ›ใ‚“ใ€‚ โ–  ่จญ่จˆใฎ็ด„ๆŸ ใƒปใ‚ขใƒ—ใƒชใฏ้กใงใ‚ใฃใฆ่ญฆๅ ฑๅ™จใงใฏใ‚ใ‚Šใพใ›ใ‚“ใ€‚้…ใ‚Œใฏๆ—ฅๆ•ฐใงๅฐใ•ใๅ‡บใ™ใ ใ‘ใงใ™ ใƒปๆ‰€่ฆๆ™‚้–“ใ‚„้”ๆˆ่ฆ‹่พผใฟใ‚’ๆŽจๅฎšใ—ใพใ›ใ‚“ใ€‚ไบ‹ๅฎŸใ ใ‘ใ‚’่กจ็คบใ—ใพใ™ ใƒป็…ฝใ‚‰ใšใ€็‚นๆ•ฐใ‚‚็ด„ๆŸใ—ใพใ›ใ‚“ ใ‚ขใƒ—ใƒชๅ†…่ชฒ้‡‘ใซใคใ„ใฆ: AIใธใฎ็›ธ่ซ‡ใจ็›ฎๆฌกใฎ่ชญใฟๅ–ใ‚Šใซใฏใ€Œใƒใ‚ฑใƒƒใƒˆใ€ใ‚’ไฝฟใ„ใพใ™ใ€‚ ็›ธ่ซ‡ใฏใ€1ๅ›žใฎ็›ธ่ซ‡ใงไฝฟใ†ไธŠ้™ใ‚’ๆฑบใ‚ใฆใ‹ใ‚‰ๅง‹ใ‚ใพใ™ใ€‚ ใฏใ˜ใ‚ใฏ3ๆžšใงใ€1ๆžšใ‹ใ‚‰100ๆžšใพใง่‡ชๅˆ†ใงๅค‰ใˆใ‚‰ใ‚Œใพใ™ใ€‚ ๆธ›ใ‚‹ใฎใฏๅฎŸ้š›ใซไฝฟใฃใŸๅˆ†ใ ใ‘ใงใ€ไธŠ้™ใ‚’่ถ…ใˆใฆไฝฟใ†ใ“ใจใฏใ‚ใ‚Šใพใ›ใ‚“ใ€‚ ็ญ”ใˆใŒๅฑŠใ‹ใชใ‹ใฃใŸใ‚„ใ‚Šๅ–ใ‚Šใงใฏๆธ›ใ‚Šใพใ›ใ‚“ใ€‚ ็›ฎๆฌกใฎ่ชญใฟๅ–ใ‚Šใฏใ€่ชญใฟๅ–ใ‚ŒใŸใƒšใƒผใ‚ธ1ๆžšใซใคใ1ๆžšใงใ™ใ€‚ ๆœ€ๅˆใซ10ๆžšใ‚’ใŠๆธกใ—ใ—ใพใ™ใ€‚ใƒใ‚ฑใƒƒใƒˆใฎ่ฟฝๅŠ ่ณผๅ…ฅใฏ่ฒทใ„ๅˆ‡ใ‚Šใงใ™ใ€‚

Screenshots

StudyCal4 screens
PIECE4 screens

Verdict

The call

The clearest difference is in-app purchases: PIECE at none against StudyCal's 3. StudyCal's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads 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. StudyCal sells 3 in-app purchases, starting at $0.99 per month. PIECE asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard3 real differences ยท 4 level
StudyCal versus PIECE: the parameters behind the verdict, then further details
ParameterStudyCalPIECE
PriceFreeFree
Positive reviews100.0% of reviewsโ€”
Update frequencyEvery 3 daysEvery 3 days
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS15.0 โ€” better17.0
Further details โ€” not scored
Size59 MB12 MB
Age rating4+4+
DeveloperKazuaki TakahashiShuntaro Shimada

In-app purchases

3 purchases

StudyCal

Subscriptions2
  • Pro+ ๆœˆ้กใƒ—ใƒฉใƒณ$0.991 Month
  • Pro+ ๅนด้กใƒ—ใƒฉใƒณ$9.991 Year
One-time1
  • ๅ‹‰ๅผทใ‚ซใƒฌใƒณใƒ€ใƒผ Pro$1.99
None

PIECE

No in-app purchases

Questions

Is StudyCal free?
StudyCal is free to download, with in-app purchases available.
Is PIECE free?
PIECE is free to download, with no in-app purchases.
Do StudyCal or PIECE have ads?
Neither StudyCal nor PIECE shows ads.
Which is updated more often, StudyCal or PIECE?
StudyCal ships an update every 3 days, and PIECE every 3 days. Most recently, StudyCal was updated on October 29, 2026 and PIECE on October 24, 2026.

Other comparisons