# Thread Gauge — Measure screw pitch & diameter > iPhone app measures screw pitch and diameter using photos and reference cards. (iPhone/iPad app by Imad Jawad.) - Source: https://appshunter.io/ios/app/thread-gauge/id6781018381 (this page in markdown: same URL + `.md`) - Developer: [Imad Jawad](https://appshunter.io/developer/6781018383) - Category: Utilities, Productivity - Price: Free - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 17.6 · 4 MB - Languages: American English, Arabic, German (Germany), Japanese, Chinese (Simplified, China), European Spanish - Released: 2026-07-01 - Data updated: 2026-08-16 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/thread-gauge/id6781018381/reviews.md ## What is Thread Gauge? Thread Gauge turns your iPhone into a precision thread gauge. Photograph a screw next to a common reference card, and it measures the thread's pitch and diameter, then identifies the closest matching standard — in both metric and imperial. No calipers, no thread gauge set, no guesswork. Just a photo. HOW IT WORKS Lay the screw on a plain background, parallel to a reference card: a credit or ID card (85.6 mm) or a full-size SD card. Use the light intensity slider to apply enough light to minimize shadows around the screw. Use the bubble level to find the best lighting angle — a green dot inside the circle is ideal. Move your phone closer or farther to get the sharpest focus; the sharper the image, the more precise your measurement. Snap a photo or pick one from your library, choose which card you used, and tap Measure. ThreadGauge uses the card as a known scale to compute the real-world thread pitch and major diameter. It all runs on your device — no server, no account, no tracking. Nothing you photograph ever leaves your iPhone. WHAT IT IDENTIFIES - Metric coarse and fine (M-series) - Imperial UNC and UNF - Thread pitch (mm and TPI) and major diameter - The closest standard match, with a confidence indicator When two standards are nearly identical — for example, a #10-32 and M5×0.8 — Thread Gauge flags the ambiguity so you can confirm with a physical gauge instead of trusting a borderline read. FEATURES - Metric and imperial in one tool - Tap to look up any identified size online - On-screen guidance for lighting, angle, and framing - Made for makers, machinists, mechanics, and anyone holding a mystery bolt PRICING Your first 3 measurements are free. One simple in-app purchase unlocks unlimited measurements — no subscription, ever. PRIVACY Thread Gauge collects no personal data, and your photos stay on your device. Questions or feedback? Email imad.naqqash@gmail.com ## Key features - Measures metric and imperial threads - Identifies closest standard match - Uses reference card for scale - On-screen guidance for photography - Offline processing, no data tracking ## Frequently asked questions about Thread Gauge ### How does Thread Gauge measure screw pitch and diameter? Thread Gauge uses a photograph of a screw placed next to a reference card (like a credit card or SD card) to establish a known scale. It then analyzes the image to compute the thread's pitch and major diameter. ### What types of threads can Thread Gauge identify? Thread Gauge can identify metric coarse and fine (M-series) threads, as well as imperial UNC and UNF threads. It provides both the thread pitch in millimeters or TPI and the major diameter. ### Is Thread Gauge free to use? Yes, Thread Gauge offers your first 3 measurements for free. A single in-app purchase unlocks unlimited measurements, with no ongoing subscription required. ### Does Thread Gauge require an internet connection? No, Thread Gauge processes all measurements directly on your device. This means it runs offline and does not require an internet connection for its core functionality. ### What devices does Thread Gauge support? Thread Gauge is currently supported on iPhones. It is designed to utilize the iPhone's camera for its measurement capabilities. ### How accurate is Thread Gauge? Thread Gauge provides a confidence indicator for its identified standard matches. For standards that are very close, it flags the ambiguity, recommending confirmation with a physical gauge. ### Does Thread Gauge collect any personal data or track users? No, Thread Gauge is designed with privacy in mind. It collects no personal data, and all photographs taken with the app remain on your device. ### How often is Thread Gauge updated? Thread Gauge was last updated on July 1, 2026, with version 1.0. Future updates will likely address bug fixes and potential feature enhancements. ## Version history (last 2 releases) ### 1.1 — 2026-07-07 Added support for Arabic, Spanish, Chinese (Simplified), German, and Japanese — Thread Gauge now follows your device language automatically. Bug fixes and improvements. ### 1.0 — 2026-07-01 No release notes. ## Apps similar to Thread Gauge | App | Rating | Price | Category | | --- | --- | --- | --- | | [Screw Identifier - Bolt ID](https://appshunter.io/ios/app/screw-identifier-bolt-id/id6759244718) | 3.6 (17) | Free | Utilities | | [ScrewFinderAI](https://appshunter.io/ios/app/screwfinderai/id6759080731) | — | Free | Utilities | | [MountFinder Pro](https://appshunter.io/ios/app/mountfinder-pro/id1606193770) | — | Free | Utilities | | [Miles to Km Converter](https://appshunter.io/ios/app/miles-to-km-converter/id6740737296) | — | $1.99 | Utilities | | [Screw Pitch Gauge](https://appshunter.io/ios/app/screw-pitch-gauge/id6749295527) | — | Free | Utilities | | [Fender Online Tools](https://appshunter.io/ios/app/fender-online-tools/id1503298239) | 5.0 (1) | Free | Utilities | ## Related topics [threader pro](https://appshunter.io/ios/topics/threader-pro) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-16.*