Comparison

Coach's Eye vs Diamond Chalk

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

Head to head
About

Coach's Eye

Transform your mobile device into a powerful video analysis tool for athletes. Record or import footage, then meticulously break it down frame by frame with professional annotation features. Organize your library and enhance your training with detailed visual feedback.

Highlights
  • Frame-by-frame video playback
  • Adjustable playback speed
  • Pinch-to-zoom functionality
  • Drawing and measurement tools
  • Video library organization
  • Import and record footage
Features
Read full description

Coach's Eye turns your iPhone or iPad into a powerful video analysis station. Import or record training footage, then break it down frame by frame with professional-grade annotation tools. ANALYZE WITH PRECISION - Step through video frame by frame, forward or backward - Adjust playback speed to catch every detail - Pinch to zoom in on any part of the frame - Scrub the timeline to jump to key moments DRAW AND MEASURE ON VIDEO - Freehand drawing to highlight form and technique - Straight line tool for alignment and trajectory - Protractor tool to measure joint angles in real time - Choose colors, stroke widths, and opacity - Object and pixel erasers for precise corrections - Full undo/redo support ORGANIZE YOUR LIBRARY - Import from your photo library or record directly - Search, sort, and filter by date range - Create custom color-coded labels to categorize videos - Resume playback right where you left off PLANS - Free: 7 videos with all annotation tools - Pro: Unlimited videos, 1 week free trial Available in English, French, German, Italian, Spanish, Portuguese, Japanese, Dutch, Korean, Russian, Simplified Chinese, Polish, Turkish, Arabic, and Traditional Chinese. Privacy policy: https://www.gymart.org/en/privacy-policy Terms and conditions: https://www.gymart.org/en/terms-of-service

About

Diamond Chalk

Features
Read full description

Diamond Chalk is the visual coaching board for softball and baseball. Drag players and runners into position, step through the situation, press Play, and every player sees who goes where — then send the play as one link that opens on any phone. WHAT'S INSIDE — 100+ preloaded plays and situations (101 today): cutoffs and relays, bunt defense, first-and-third, steals and pickoffs, rundowns, pop-up communication, double plays, infield defense, outfield play, baserunning · Fastpitch and baseball field presets, infield or full-field view · Step-by-step animation with a note for each step, adjustable speed, loop · Draw on the field: arrows, paths, coverage · Your team's name, colors, and logo on the board and in every link · Works completely offline at the field FREE FOR PLAYERS AND PARENTS — A play a coach sends you opens on any phone. No account, no subscription, ever. FREE PLAN — Coaches get the full interactive board and 5 starter situations free, with no account and no card. DIAMOND CHALK COACH — $9.99 per month or $79.99 per year, billed to your Apple ID; cancel anytime in Settings. Coach opens everything: all 101 situations in every category · unlimited saved plays, synced to every device you sign in on · share links that open on any phone · team name, colors, and logo on the board and in every link. New subscribers get a 3-day free trial where offered, shown on Apple's purchase sheet; it becomes the paid subscription unless canceled at least 24 hours before it ends. Subscriptions renew automatically unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel in Settings › Apple ID › Subscriptions. Terms of Use: https://diamondchalk.app/terms.html Privacy Policy: https://diamondchalk.app/privacy.html

Screenshots

Coach's Eye4 screens
Diamond Chalk4 screens

Verdict

The call

The clearest difference is update cadence: Coach's Eye at every 9 days against Diamond Chalk's every 3 weeks. Diamond Chalk's advantage is iOS requirement (15.0 vs 17.0). 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. Coach's Eye sells 7 in-app purchases, starting at $6.99 per month and Diamond Chalk sells 4 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Coach's Eye ships an update every 9 days, Diamond Chalk every 3 weeks. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Coach's Eye versus Diamond Chalk: the parameters behind the verdict, then further details
ParameterCoach's EyeDiamond Chalk
PriceFreeFree
Rating4.1 (31 ratings) — better—
Positive reviews28.6% of reviews—
Number of ratings31 — better—
Update frequencyEvery 9 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.015.0 — better
Further details — not scored
Size26 MB14 MB
Age rating4+4+
DeveloperGym Art Inc.RYAN LEE HOUSE

In-app purchases

7 purchases

Coach's Eye

Subscriptions7
  • Élite3 Days trial$6.991 Month
  • Unlimited7 Days trial$9.991 Month
  • Elite3 Days trial$34.991 Year
Show 4 more
  • Elite1 Year trial2 variants$64.991 Year
  • Élite3 Days trial$64.991 Year
  • 1 year 40% off1 Year trial$64.991 Year
  • Unlimited7 Days trial$99.991 Year
4 purchases

Diamond Chalk

Subscriptions4
  • Coach — Monthly3 Days trial$9.991 Month
  • Diamond Chalk Pro$19.991 Month
  • Coach — Yearly3 Days trial$79.991 Year
Show 1 more
  • Diamond Chalk Pro$159.991 Year

Questions

Is Coach's Eye free?
Coach's Eye is free to download, with in-app purchases available.
Is Diamond Chalk free?
Diamond Chalk is free to download, with in-app purchases available.
Do Coach's Eye or Diamond Chalk have ads?
Neither Coach's Eye nor Diamond Chalk shows ads.
Which is updated more often, Coach's Eye or Diamond Chalk?
Coach's Eye ships an update every 9 days, and Diamond Chalk every 3 weeks. Most recently, Coach's Eye was updated on November 9, 2026 and Diamond Chalk on October 31, 2026.

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