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Best Difcal Apps

210+ iOS apps curated and reviewed

4.3 avg rating
19 free apps
Updated June 2026

Every iPhone needs a few good difcal apps. We benchmark 210+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Compare top Difcal Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1DifCalDifCal$1.99—NoNoMay 2026
2Rock Identifier: Stone IDRock Identifier: Stone IDFree4.7★ (75K)YesYesJul 2026
3수평계: AR 각도측정, 경사계수평계: AR 각도측정, 경사계Free4.5★ (677)YesYesJul 2026
43D modeling: Design my model3D modeling: Design my modelFree4.6★ (13K)NoYesJul 2026
5A Guide To Crystals - The CCA Guide To Crystals - The CCFree4.9★ (4.1K)NoYesJul 2026
6MoleculesMoleculesFree3.6★ (166)NoNoJul 2026
73D Snap: LiDAR Scanner & Ruler3D Snap: LiDAR Scanner & RulerFree3.9★ (238)YesYesJul 2026
8Rock ID・Gem & Stone IdentifierRock ID・Gem & Stone IdentifierFree4.4★ (3K)NoYesJul 2026

Top Picks for Difcal

Rock Identifier: Stone ID#2

Rock Identifier: Stone ID by Next Vision Limited

Gem Mineral Crystal Identifier
Strong Contender
📚 Education
4.7😐(75K ratings)
FreeAdsIn-App Purchases
#15in Education
Rock Identifier: Stone ID screenshot 1
Rock Identifier: Stone ID screenshot 2
Rock Identifier: Stone ID screenshot 3
Rock Identifier: Stone ID screenshot 4
Rock Identifier: Stone ID screenshot 5
Rock Identifier: Stone ID screenshot 6

Instantly identify rocks, minerals, and gemstones by taking a photo. Access a comprehensive encyclopedia with detailed information on each stone, learn to distinguish real from fake gems, and explore their properties. The app also includes a metal detector and expert consultation.

What We Love

  • 🤩 Accurate rock identification
  • 🤓 Extensive information on rocks
  • 🧠 Helpful for learning about rocks
  • 🪨 Great for rock collectors

Room to Improve

  • 💰 Expensive subscription model
  • 🔢 Limited free scans per day
  • 🔍 Inconsistent accuracy, sometimes wrong
수평계: AR 각도측정, 경사계#3

수평계: AR 각도측정, 경사계 by Jens Rieckhof

기포 수준기, 경사도, 직각자
Worth Considering
🔧 Utilities
4.5😞(677 ratings)
FreeAdsIn-App Purchases
수평계: AR 각도측정, 경사계 screenshot 1
수평계: AR 각도측정, 경사계 screenshot 2
수평계: AR 각도측정, 경사계 screenshot 3
수평계: AR 각도측정, 경사계 screenshot 4
수평계: AR 각도측정, 경사계 screenshot 5
수평계: AR 각도측정, 경사계 screenshot 6

This app transforms your phone into a precise leveling tool. It offers accurate angle measurement, inclination detection, and augmented reality features for DIY and professional use. Calibration is simple and quick.

What We Love

  • 👍 Simple and easy to use
  • 🔍 Accurate angle measurements
  • 🛠️ Helpful for various tasks (telescopes, leveling, etc.)

Room to Improve

  • 🤑 Expensive ad removal
  • 🤖 Unreliable calibration
  • 💤 Constant interruptions and ads

More Difcal apps to explore

4
3D modeling: Design my model
3D modeling: Design my model
3D modeling: Design my model
Sculpt & sketch digital art
Free

Create 3D models and digital art on your mobile device. Sculpt, sketch, and color your designs with intuitive gesture controls and a comprehensive set of modeling tools. Export your creations in standard formats.

Gesture-based 3D manipulationVertex, edge, and face editing toolsSculpting and coloring capabilities
🎨 Graphics & Design
(13K)
free with in-app purchases
5
A Guide To Crystals - The CC
A Guide To Crystals - The CC
A Guide To Crystals - The CC
The Citrine Circle
Free

Explore a comprehensive A-Z guide to over 500 crystals and minerals, offering geological and metaphysical details. Catalog your personal collection with photos, notes, and interactive 3D models. Discover new crystals through quizzes, games, and advanced search filters.

A-Z crystal and mineral databaseGeological and metaphysical informationPersonal crystal collection cataloging
🔍 Reference
(4.1K)
freemium
6
Molecules
Molecules
Molecules
by Sunset Lake Software
Free

Explore and interact with 3D molecular models on your device. Rotate, zoom, and pan structures using intuitive touch gestures. Visualize molecules in different modes and load custom structures from various sources.

3D molecule renderingFinger-based manipulation (rotate, zoom, pan)Ball-and-stick visualization
📚 Education
(166)
free
7
3D Snap: LiDAR Scanner & Ruler
3D Snap: LiDAR Scanner & Ruler
3D Snap: LiDAR Scanner & Ruler
Room & Floor Plan, AR Measure
Free

Transform your iPhone into a powerful floor plan creator and 3D scanner using LiDAR technology. Quickly capture room layouts, measure spaces, and visualize objects in 3D for renovation, interior design, or moving.

LiDAR-powered room scanningInstant floor plan generation3D object scanning from photos
📊 Productivity
(238)
free with in-app purchases
8
Rock ID・Gem & Stone Identifier
Rock ID・Gem & Stone Identifier
Rock ID・Gem & Stone Identifier
Diamond Tester・Crystal Scanner
Free

Instantly identify rocks, minerals, and gems by snapping a photo. Explore detailed profiles, manage your personal collections, and keep a log of all your discoveries. Become a geology expert with this comprehensive guide.

Instant AI-powered stone identificationVast catalog of rock profilesPersonal rock and mineral collections
📚 Education
(3K)
free with in-app purchases
9
EMD PTE
EMD PTE
EMD PTE
by Merck KGaA (Darmstadt, Germany)
Free

This comprehensive mobile reference work provides detailed information on all chemical elements. It features a molar mass calculator, interactive visualizations, and offline access, making it an indispensable tool for students, educators, and chemistry enthusiasts.

Detailed element informationVisualized element propertiesMolar mass calculator
📚 Education
(121)
free
10
Aktiv Learning
Aktiv Learning
Aktiv Learning
Chemistry & Math
Free

This platform offers dynamic problems and interactive tools for college-level chemistry and math. It helps students visualize abstract STEM concepts and provides instructors with real-time insights into class understanding. Features include a mobile-friendly Lewis structure drawing tool and over 250 practice questions.

Interactive Lewis structure drawing toolDynamic STEM problemsReal-time class results
📚 Education
(183)
free with in-app purchases
11
Rock & Crystal Identifier
Rock & Crystal Identifier
Rock & Crystal Identifier
ID Crystals Mineral Gem Stones
Free

Instantly identify rocks, crystals, and minerals by uploading a photo. Explore their history, meaning, and energetic qualities. Organize your collection and connect with experts for insights.

Photo-based rock identificationCrystal and mineral encyclopediaSearch by planet, color, emotion, chakra
📚 Education
(2.5K)
freemium
12
Chemistry. Periodic table. AI
Chemistry. Periodic table. AI
Chemistry. Periodic table. AI
Chemical reactions. Elements
Free

Explore an interactive periodic table with 3D models and AR features. This app offers an AI-powered tutor for simplified explanations, a reaction solver, and a molar mass calculator. It's a comprehensive reference for students and professionals to learn chemistry effectively.

Interactive Periodic Table with 3D modelsAI-powered chemistry tutor (ChemAI)Chemical reaction solver
📚 Education
(2.7K)
free with in-app purchases
13
Protractor+
Protractor+
Protractor+
+ Angle Meter & Clinometer
Free

Transform your device into a versatile angle measurement tool. Easily measure angles in both degrees and radians with an intuitive interface. Ideal for quick and precise angle readings.

Angle measurementDegrees and radiansIntuitive visual control
🔧 Utilities
(10K)
free with in-app purchases
14
Stone Identifier
Stone Identifier
Stone Identifier
Rock, Crystal & Gem Scanner
Free

Instantly identify rocks, stones, gems, and crystals by taking a photo or uploading an image. Get accurate results in seconds with a rich database and user-friendly interface. Perfect for both geologists and enthusiasts.

Identify Rocks, Gems, and CrystalsAccurate identification resultsFast and convenient tool
📚 Education
(810)
free with in-app purchases
15
Angle Meter 360
Angle Meter 360
Angle Meter 360
Convenient angle meter, finder
Free

Measure angles precisely on photos or in real-time using your camera. This user-friendly tool allows for unlimited angle measurements simultaneously, with features like scaling and color adjustment for ease of use.

Angle measurement on picturesReal-time camera angle measurementUnlimited simultaneous angle measurements
🔧 Utilities
(353)
free with in-app purchases
16
Protractor (Angle measurement)
Protractor (Angle measurement)
Protractor (Angle measurement)
by Seong Eon Kim
Free

Measure angles of objects using your device's camera. This utility app acts as a digital protractor, allowing you to accurately determine angles in real-world scenarios. Perfect for when a physical protractor is unavailable.

Camera-based angle measurementDigital protractor functionalityMeasure angles of objects
🔧 Utilities
(2)
ad-supported
17
Frequency Analyzer
Frequency Analyzer
Frequency Analyzer
Audio Spectrum, Spectroid, dB
Free

Transform your device into a professional audio analysis tool with advanced FFT analysis, SPL monitoring, and detailed visualizations. Record, analyze, and export audio data with precision calibration and multiple weighting filters.

Real-time FFT analysisCalibrated SPL measurements32-bit float audio recording
🔧 Utilities
(149)
free with in-app purchases
18
угломер
угломер
угломер
Angle Finder & Protractor
Free

This tool transforms your device into a precise angle measurement instrument. It's ideal for DIY projects, construction, and renovations, offering real-time readings in various formats. Get professional-grade accuracy for all your angled surface needs.

Precise angle measurementVertical and horizontal orientationsMultiple measurement units (degrees, radians, gradians)
🔧 Utilities
(148)
free with in-app purchases
19
Protractor for Angle Measuring
Protractor for Angle Measuring
Protractor for Angle Measuring
Measure Angles in Few Taps
Free

Transform your iPhone into a precision angle measuring tool. Easily measure angles in real-time using touch or camera modes, and even analyze angles in existing photos. Customize your tools for a seamless experience.

Real-time angle measurementTouch and camera modesMeasure angles in photos
🔧 Utilities
(976)
free with in-app purchases
20
Stone Identifier.
Stone Identifier.
Stone Identifier.
Identify Gem, Mineral Crystals
Free

Instantly identify rocks, crystals, minerals, and gems by simply taking a photo. Access a comprehensive library of stones, learn to distinguish real from fake, and even create your own rock collections. Connect with experts for deeper insights.

Photo-based stone identificationExtensive library of stones and gemsExpert chat for stone inquiries
🔧 Utilities
(348)
free with in-app purchases

FAQ about Difcal

Are there free difcal apps for iPhone?
Yes — 19 of the top difcal apps we rank are free to download, including Rock Identifier: Stone ID and 수평계: AR 각도측정, 경사계.
DifCal has no ads and has no in-app purchases, according to its App Store listing as of June 2026.
We track 210+ difcal apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.