Comparison

YAJI vs Aligner Tracker

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

Head to head
About

YAJI

This app helps users track their orthodontic journey with guided photo records, progress comparisons, and personalized reminders. It offers features for both braces and clear aligners, ensuring a private and organized log of dental treatment.

Highlights
  • Guided photo records
  • Side-by-side comparison tools
  • Progress video creation
  • Customizable reminders
  • Clear aligner tracking
  • Private on-device storage
Features
Read full description

YAJI is a private, on-device journal for people with fixed braces or clear aligners. Build a consistent visual record, compare changes over time, and keep notes and reminders organized between appointments. GUIDED PHOTO RECORDS • Capture up to nine guided facial and intraoral views, or create a custom view.• Take photos in sequence or import existing images.• Review records by calendar, timeline, full-size image, or grid.• Add notes, observation tags, tooth or location details, and follow-up items. COMPARE OVER TIME • Compare the same view from two dates side by side or stacked. • Use slider, overlay, alignment, and reference-line tools for closer visual review. • Create a progress video from a series of same-view photos. • Add three-point angle annotations to profile images for personal reference. REMINDERS AND ALIGNER TRACKING • Set daily or weekly record reminders and appointment reminders. • Record appointment dates and add notes after each visit. • Choose fixed-braces or clear-aligner mode for relevant tracking. • In clear-aligner mode, track treatment phase, current tray, planned wear time, and aligner-off time. • View aligner-off timing through Live Activities on supported iPhone models. PRIVATE BY DESIGN • No YAJI account required. • Core records stay in YAJI’s private space on your iPhone. • No advertising or third-party analytics. • Photos, annotated images, reports, and videos leave YAJI only when you choose to save or share them. • YAJI does not provide in-app cross-device iCloud sync. Structured app data may still be included in device backups based on your Apple settings, and copies saved to Photos may sync through iCloud Photos. YAJI PROYAJI Pro unlocks all guided and custom views, advanced comparison tools, reference lines, alignment, progress videos, and complete photo angle annotation. IMPORTANTYAJI is a personal record-keeping and image-annotation tool. It is not a medical device and does not diagnose conditions, assess treatment outcomes, recommend treatment, or replace care from a dentist or orthodontist. Photos and angle annotations may vary with lighting, distance, camera settings, lens distortion, angle, and point placement. Do not use them as clinical measurements or proof of treatment results. Do not change appliance wear or treatment based only on YAJI records. If you experience persistent or severe pain, significant swelling or bleeding, an injury, difficulty breathing or swallowing, or another urgent concern, contact a qualified clinician or local emergency services promptly. Terms of Use (Apple Standard EULA):https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Aligner Tracker

This clear aligner journal helps you track daily wear, tray changes, and appointments. It allows you to log aligner status, store progress photos, and view wear-time charts. Personalize your experience with themes and multiple languages.

Highlights
  • Log aligner in/out times
  • Track tray changes and appointments
  • Store and organize progress photos
  • View wear-time charts
  • Customizable themes and languages
  • Manual and iCloud backups
Read full description

AlignerDiary is your personal clear aligner journal, bringing daily wear, tray changes, orthodontic appointments and photos together. Redesigned navigation across five tabs makes recording and looking back feel more connected. No registration required. Log when your aligners are in or out Tap when you take them out or put them back in to view your recorded wear time. Add or correct missed entries, record how you feel and leave a note. Review each set of aligners Browse a calendar and daily timeline for each set, with wearing, removed and unknown periods shown separately. Enter the change dates and orthodontic appointments set by your dental professional, and add local reminders. Keep your everyday photos together Take photos or import several at once, organized by date and aligner set. Use the camera guide and 3-second countdown, then adjust the image after capture. Dates appear on thumbnails. Swipe left or right through photo details, or browse with the thumbnail strip. Compare multiple photos in stacked or tiled layouts: pinch to zoom them together, then pan them together while zoomed in. Photos are for personal review; the app does not assess treatment results. Look back with wear-time charts Choose a window of up to 7, 30 or 90 days, limited by your actual history. View daily recorded wear time alongside your goal curve. Recent summaries and per-set averages stop at yesterday; today is marked as in progress. Unknown time is not counted as zero. Make it feel like yours Choose from four color themes, with light and dark modes. The app supports ten interface languages, including Simplified and Traditional Chinese, English, Japanese and Arabic. Your records and photos stay on your device by default. Export a complete manual backup including photo files, or use a private iCloud backup in your own Apple account. iCloud backup requires an available account and network access. Backup is not two-way sync between devices. Optional, voluntary one-time tips are not subscriptions and do not unlock features. AlignerDiary is for personal records. It does not provide diagnosis or treatment advice, assess treatment outcomes or automatically change your treatment schedule. Follow the plan set by your dental professional.

Screenshots

YAJI4 screens
Aligner Tracker4 screens

Verdict

The call

YAJI and Aligner Tracker are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. YAJI sells 4 in-app purchases, starting at $1.09 per 7 days and Aligner Tracker sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for YAJI against 5.0 for Aligner Tracker. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

YAJI ships an update every 3 days, Aligner Tracker every 4 days. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.

ScorecardNo meaningful differences
YAJI versus Aligner Tracker: the parameters behind the verdict, then further details
ParameterYAJIAligner Tracker
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings11
Update frequencyEvery 3 days — betterEvery 4 days
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS17.016.4 — better
Further details — not scored
Size23 MB42 MB
Age rating17+4+
Developer若涵 余智寅 丁

Customer experience

YAJI

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Aligner Tracker

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

YAJI

Subscriptions3
  • 牙记 Pro 周体验$1.097 Days
  • Yaji Pro Monthly$2.991 Month
  • Yaji Pro Yearly1 Year trial$14.991 Year
One-time1
  • Yaji Pro Lifetime$29.99
4 purchases

Aligner Tracker

One-time4
  • 曲奇$0.99
  • 美式$1.99
  • 拿铁$2.99
Show 1 more
  • SOE$3.99

Questions

Is YAJI free?
YAJI is free to download, with in-app purchases available.
Is Aligner Tracker free?
Aligner Tracker is free to download, with in-app purchases available.
Which has better reviews, YAJI or Aligner Tracker?
YAJI and Aligner Tracker are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do YAJI or Aligner Tracker have ads?
Neither YAJI nor Aligner Tracker shows ads.
Which is updated more often, YAJI or Aligner Tracker?
YAJI ships an update every 3 days, and Aligner Tracker every 4 days. Most recently, YAJI was updated on November 10, 2026 and Aligner Tracker on November 6, 2026.

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