Screenshot Pixel Measure Tool vs ClassKeep

Screen Ruler is the ultimate pixel-perfect measurement tool for screenshots, photos, blueprints, floor plans, and any image. Whether you're a UI designer checking spacing, an architect measuring floor plans, or an engineer verifying dimensions — Screen Ruler gives you precision tools right on your iPhone and iPad. PRECISION MEASUREMENT TOOLS • Side Rulers — Four-sided rulers along image edges with configurable origin corner • Freehand Ruler — Drag, rotate, and position anywhere with 15° angle snapping • Protractor — Measure angles with pinch, pan, and rotate gestures • Grid Overlay — Adjustable grid lines with customizable thickness and opacity • Floating Crosshair — Always-visible position tracker with real-time coordinates • Multi-Point Distance — Tap multiple points to measure paths and cumulative distances • Area Measurement — Draw polygons to calculate enclosed area in any unit SMART CALIBRATION • Draw-to-Calibrate — Draw a reference line on any image and enter its real-world length. The app auto-calculates the scale for all measurements • Multiple Reference Points — Set different scales for different regions of the same image • Preset Units — Pixels (1x, 2x, 3x), Centimeters, Millimeters, Inches, Picas • Custom Ratio — Define any pixel-to-unit ratio for specialized workflows AI-POWERED FEATURES • Auto-Scale Detection — Automatically detects known objects (credit cards, coins, rulers, A4 paper) and calibrates the measurement scale • Edge Detection — Snap measurements to detected edges and boundaries for pixel-perfect accuracy • OCR Scale Reading — Reads scale legends on blueprints and maps to auto-configure measurements • Object Dimension Detection — Automatically detects objects and draws dimension lines • Perspective Correction — Straighten angled photos for more accurate measurements • Smart Suggestions — AI recommends measurement units and tools based on image type • Color Palette Extraction — Extract dominant colors with WCAG contrast compliance checking COLOR ANALYSIS • Magnifying Glass — 3x magnified view with crosshair for precise pixel targeting • RGB & HEX Values — Instant color code readout at any point • Pixel Coordinates — See exact X/Y position relative to any corner origin • Scaled Coordinates — View coordinates in your chosen measurement unit ANNOTATIONS & EXPORT • Measurement Annotations — Draw lines, rectangles, and circles with persistent dimension labels • Angle Annotations — Measure and label angles between any two lines • Auto-Labeling — AI suggests meaningful names for your measurements • Export as PDF or PNG — Save annotated images with all measurement data • Measurement History — Save sessions with calibration data for later reference WORKFLOW & PRODUCTIVITY • Measurement Templates — Preset workflows for common tasks (Room Dimensions, UI Spacing, PCB Layout) • Image Overlay — Compare two images with adjustable transparency • Apple Pencil Support — Draw precision measurement lines on iPad • Comparison Mode — Side-by-side synchronized view for before/after analysis • AI Measurement Assistant — Get help with unit conversions, standards, and best practices CUSTOMIZATION • Theme Colors — Personalize with custom color themes • Adjustable Opacity — Fine-tune visibility of rulers, grids, and protractor • Ruler Position — Set measurement origin to any corner • Grid Thickness — Choose from 5 thickness levels WORKS WITH ANY IMAGE • Screenshots — Auto-loads your latest screenshot • Photo Library — Browse and select any photo • Camera — Capture photos directly for measurement • Files — Import images from the Files app • 3D Touch — Quick action to open latest screenshot Localized in 40+ languages including English, Spanish, French, German, Japanese, Chinese, Arabic, Hindi, Portuguese, Korean, and many more. PERFECT FOR Designers • Developers • QA • Digital Artists • Crafters • Photographers • Students • Architects • Content Creators Privacy Policy https://infoenum.com/mobile_app_privacy_policy.html

Still tracking lessons with paper or spreadsheets—and dreading month-end reconciliation? ClassKeep is for teachers who run their own students— schedule, attendance, and lesson credits in one flow. After each class you’ll know: how many were used, how many remain, and whether the money adds up. 【Sound familiar?】 • A parent asks on Saturday “how many lessons left?”—you dig through chat history • Excel says “attended,” but payments don’t match • Reschedules and make-ups live in one place; balances live in another • School admin software is too heavy for one person 【Who it’s for】 • Home / studio one-on-one: piano, voice, guitar, violin, art, private speech therapy… • Small groups: beginner band, dance teams, coding clubs, kids’ chess, youth theater… • Sports & fitness: swim lessons, tennis coaching, personal training packages, martial arts… • Academic tutoring: SAT / ACT prep, math & reading, AP subjects, college essay coaching… • Mixed formats: private lessons on weekdays, 3–8 student groups on weekends, different rates by level • Not a huge roster—but the books must be clear: dozens of active students, parents asking “lessons left / how much paid” It’s a strong fit if— you find your own students, teach, and get paid yourself as an independent tutor, coach, or part-time teacher; you only need to take attendance on your phone before/after class; and you’d rather not pay for clunky school software or wrestle spreadsheets again. Not a fit for: franchise academies, multi-location studios with staffed front desks, multi-teacher teams, or anyone who needs a parent booking portal / admissions CRM—use a full studio management system instead. 【With ClassKeep】 Maya teaches piano from her home studio: she sets pricing for “Piano — Intermediate,” enrolls Emma and Noah for 16 lessons each, opens a Saturday trio class, and generates the month’s schedule in one go. On lesson day she marks attendance—present deducts a credit; excused absence does not. When parents ask at month-end, student profiles or Stats show the answer at a glance. Private lessons work the same: one student = one class, fixed weekly time, attendance deducts credits. Data stays on your device—backup and export anytime. 【Free & Pro】 The free plan covers the full teaching loop. Free tier has limits on students, active classes, and courses; upgrade to Pro for unlimited capacity as you grow. —— Features (skim when you need them) —— • Class schedule: day / week / month; reschedule this session only or all future ones • Attendance & credits: present / leave / absent; balances update live; over-attendance when credits run out • Lesson ledger: enroll, renew, withdraw—remaining lessons and amounts in one place • Conflict warnings when times collide • Local notifications: before class, when renewals are due, when a class is almost fully scheduled • On-device data: spreadsheet export + backup/restore—no cloud account required Subscriptions: Pro is an auto-renewable Apple subscription. Manage or cancel in Settings. See in-app subscription details. Terms of Use: https://my.feishu.cn/wiki/Q09nw8YkFiy0jYkx8Xyc1PthnCf Privacy Policy: https://www.freeprivacypolicy.com/live/e1b3e58b-73dc-4ff8-a116-e33ff6c08a03 Questions? Check Feature Guide & FAQ under More in the app, or contact us via App Store developer support.