Bolt Thread Identifier vs Thread Gauge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Bolt Thread Identifier
Identify bolt thread pitches by taking a photo. This app uses AI to match SAE-UNC, SAE-UNF, or metric pitches after a simple distance calibration. It's a handy tool for anyone working with fasteners.
- Photo-based thread pitch measurement
- AI-driven pitch matching
- Supports SAE-UNC, SAE-UNF, and metric threads
- Simple distance calibration
- Useful for fabricators and mechanics
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Measure the thread pitch of common bolts by snapping a photo and performing a simple distance calibration. Custom AI algorithms will then return the matching SAE-UNC, SAE-UNF, or metric pitches. Fabricators, mechanics, home owners, and hobbyists in general will find the Bolt Thread Identifier App a useful addition to their tool box.
Thread Gauge
This app transforms your iPhone into a precise thread measurement tool. Simply photograph a screw next to a reference card to accurately determine its pitch and diameter, identifying the closest standard in both metric and imperial units.
- Measures metric and imperial threads
- Identifies closest standard match
- Uses reference card for scale
- On-screen guidance for photography
- Offline processing, no data tracking
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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
Screenshots
Verdict
The clearest difference is rating: Thread Gauge at 5.0 against Bolt Thread Identifier's 2.3. Thread Gauge also leads on update cadence (every 6 days vs every 11 months) and iOS requirement (17.6 vs 26.0). Bolt Thread Identifier's advantage is monetization model (free vs free with in-app purchases) and ratings volume (3 vs 1). 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Thread Gauge holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
Bolt Thread Identifier ships an update every 11 months, Thread Gauge every 6 days. The most recent releases landed on September 20, 2026 and August 16, 2026 respectively.
| Parameter | Bolt Thread Identifier | Thread Gauge |
|---|---|---|
| Price | Free | Free |
| Rating | 2.3 (3 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 11 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 26.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 58 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Geared Design Consulting L.L.C. | Imad Jawad |
Customer experience
Bolt Thread Identifier
Thread Gauge
In-app purchases
Bolt Thread Identifier
No in-app purchases
Thread Gauge
No in-app purchases
Questions
Is Bolt Thread Identifier free?
Is Thread Gauge free?
Which has better reviews, Bolt Thread Identifier or Thread Gauge?
Do Bolt Thread Identifier or Thread Gauge have ads?
Which is updated more often, Bolt Thread Identifier or Thread Gauge?
Other comparisons
