Used Phone Inspector vs Formula Canvas

Don't overpay for a stolen, locked, or secretly broken iPhone. Used Phone Inspector is the buyer's 10-minute checklist for anyone meeting a stranger on Marketplace, Craigslist, OfferUp, or Swappa. Scan the IMEI. Check Activation Lock. Grade the speaker automatically. Catch swapped batteries and non-genuine parts. Walk away with a color-coded PDF report — Green, Yellow, or Red — you can show the seller on the spot. SPOT STOLEN OR LOCKED iPHONES The #1 reason buyers get burned. Guided checks that take 60 seconds. - IMEI scanner — point your camera at the SIM tray, we read the serial - Activation Lock walkthrough — plain-English "walk away now" verdicts - Find My status + Carrier Lock — step-by-step Settings guidance - Unknown Parts detection — catches the warning badges sellers hide RUN 15 BUYER-CRITICAL CHECKS IN 10 MINUTES A single ordered flow, not a grid of 40 random sensor icons. - Display — dead-pixel color slides + multitouch grid - Cameras — front, wide, ultrawide, telephoto + flashlight - Sensors — accelerometer, gyro, magnetometer, GPS - Buttons, haptics, Face ID / Touch ID, Wi-Fi, Bluetooth, Cellular AUTOMATED AUDIO GRADING No more "can you hear it?" guesswork. - Speaker — 20Hz to 20kHz tone sweep, RMS scored in dB - Microphone — 3-second capture + ambient floor analysis - Objective pass/fail readings you can defend in negotiation WALK AWAY WITH A PDF REPORT Use it to negotiate hundreds off — or prove you did your homework. - Green / Yellow / Red verdict with itemized breakdown - Plain-English "what this means" recommendation - Shareable PDF — AirDrop to the seller, email it to yourself ALSO WORKS ON YOUR OWN iPHONE Run a quick health check before trade-in, insurance claims, or resale. PRICING FREE: - 1 full saved inspection report (lifetime) - Unlimited Quick Check mode (run tests without saving) - Watermarked PDF exports - Full 15-step test suite PREMIUM SUBSCRIPTION Used Phone Inspector Premium is available with the following options: Premium Weekly: $4.99/week Premium Annual: $29.99/year — includes 7-day free trial Payment will be charged to your Apple ID account at confirmation of purchase. Subscription automatically renews unless canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage and cancel your subscriptions by going to your App Store account settings after purchase. Terms of Service: https://usediphoneinspector.bulpara.com/terms Privacy Policy: https://usediphoneinspector.bulpara.com/privacy Questions? hello@bulpara.com

Formula Canvas is a native math workspace for writing formulas, building study notes, and preparing clean LaTeX without fighting plain text syntax. Create expressions visually with a structured math keyboard. Add fractions, radicals, superscripts, subscripts, sums, products, integrals, scalable brackets, matrices, equation systems, accents, Greek letters, arrows, relations, set symbols, and common functions. Tap to place the cursor, move through formula structures with direction controls, and undo or redo edits as you work. The live LaTeX preview keeps your source visible while you edit. Copy LaTeX instantly, or unlock advanced export and sharing with Formula Canvas Pro. Formula Canvas also includes a document workspace for longer notes. Combine text blocks, formula blocks, and handwriting blocks in the same document, then keep everything organized in a local document list. Use the drawing canvas for quick geometry sketches, annotations, diagrams, and handwritten ideas. Apple Pencil is supported through PencilKit, and built-in shape stamps help you insert lines, arrows, rectangles, and ellipses quickly. Built fully native with Swift and Core Graphics, Formula Canvas is designed for responsive formula editing on iPhone and iPad. Key features: - Visual WYSIWYG math formula editing - Structured keyboard for symbols, functions, calculus, matrices, and formulas - Fractions, roots, scripts, limits, integrals, matrices, delimiters, and accents - Tap-based cursor placement and structural navigation controls - Live LaTeX preview with copy support - Multi-block documents with text, formulas, and handwriting - PencilKit drawing with Apple Pencil support - Shape stamps for lines, arrows, rectangles, and ellipses - Local document storage on your device - Optional one-time Pro upgrade, no subscription Formula Canvas Pro unlocks unlimited formula documents, advanced LaTeX export and sharing, and handwriting and drawing tools.