i vs iNC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
i
This utility app assists machinists with CNC calculations, including cutting speed, RPM, and feed rate. It also provides databases for hole and shaft tolerances, as well as detailed thread specifications.
- Cutting speed calculation
- RPM calculation
- Feed rate calculation
- Hole and shaft tolerance database
- Thread data
- Milling, drilling, and turning operations
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iMachinist is a simple to use CNC calculator app that calculates for you the cuttings speed, RPM, feed rate and more for your milling, drilling and turning operations. iMachinist also includes a database for Hole and Shaft Tolerances and different Threads. Threads Data: - Outer Diameter (max/min) - Pitch Diameter (max/min) - Core Diameter (max/min) - Thread Height (max/min) Tolerance Data: - Zone (Shaft/Hole) - Grade (Shaft/Hole) - Diameter (Shaft/Hole) Cutting Calculator: - Tool Diameter - Cutting Speed - Spindle Speed - Number of Teeth - Feed per Tooth - Feed Rate
iNC
Edit and simulate CNC G-code with 3D toolpath visualization. Inspect stock removal, view STEP/STL models, and access programming practice tools. Offers file management and basic 3D viewing for free, with advanced features requiring a subscription.
- NC/G-code editing with syntax highlighting
- 3D stock removal simulation
- STEP/STL model viewing and measurement
- Toolpath inspection with code comparison
- FANUC and Mitsubishi macro tracing
- File management and organization
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Edit NC/G-code, review 3D toolpaths, inspect stock removal and view STEP/STL models on iPhone and iPad. iNC-Mill brings programs, toolpaths and part geometry into one workspace for shop-floor review, programming practice and teaching. File management and basic 3D viewing are free. NC editing, simulation, knowledge references, calculators, advanced 3D tools and settings, and AI questions require an active subscription. NC/G-CODE EDITING • Import NC programs from Files, AirDrop or other apps • Edit with syntax highlighting, line navigation, search and replace • Renumber or remove N block numbers in selected lines or an entire file • Review very large programs in a dedicated read-only mode MILLING, TURNING AND MACROS • Watch stock removal during 3-axis milling and turning playback • Set up box, cylinder or tube stock for milling, and bar, tube or stepped stock for turning • Save reusable stock presets, set dimensions and workpiece origins, and keep confirmed settings with each program • Inspect 3-axis and 5-axis toolpaths with distinct rapid, feed and arc motion • Trace FANUC macro execution flow and machine state • Work with Mitsubishi M800/M80 milling and turning programs, with matching command references, parameter forms and examples • Review supported Haas NGC 3-axis milling and 2-axis turning commands, common cycles and dedicated settings, with matching references and examples • Review macros, subprograms and canned cycles within the supported scope of the selected controller CODE BESIDE TOOLPATHS • Compare 3D toolpaths with read-only NC code in resizable Machining-mode panes • Follow associated source lines and available tool, feed, spindle and position readouts • Navigate by move, Z change, cutting section or tool section • Play forward or in reverse; adjust speed, path colors and viewing direction • Keep the camera and playback position when switching preview modes STEP/STL MODEL VIEWING • Open STP/STEP and STL files; rotate, zoom and use standard views • Explore STEP assembly trees, hide or isolate components, and adjust exploded views • Inspect internal geometry with interactive section planes • Measure supported STEP geometry: distances, radii, angles, areas and model dimensions • Measure between toolpath points and visible simulated workpiece surfaces Model viewing is read-only. STEP measurements use supported CAD geometry; STL and simulated workpiece measurements are mesh-based approximations. Toolpath curves use generated segments. Measurements do not certify physical part dimensions. FILES AND MACHINING TOOLS • Create, import, search and organize files; reopen recent files • Move files and folders in batches, copy folders and restore Recently Deleted items • Review program tool checklists to verify executed tools, spindle speeds and feedrates • Manage machine and tool definitions; browse 8 milling and turning controller libraries and insert generated G/M-code commands using parameter forms • Use milling, turning and quick calculators ON-DEVICE WORKFLOW Core NC editing, parsing, model viewing, toolpath review and simulation run on device. These tools do not require uploading your machining files. iNC-Mill supports program review and visualization. Professional verification, collision checks and machine, tooling and fixture checks remain necessary before machining. SUBSCRIPTIONS Monthly and yearly plans, prices and any available trial are shown in the App Store at purchase time. Payment is charged to your Apple ID after confirmation. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel in Settings > Apple ID > Subscriptions. Terms of Use: https://inc-mill.com/en/terms Privacy Policy: https://inc-mill.com/en/privacy
Screenshots
Verdict
The clearest difference is rating: iNC at 5.0 against i's 2.6. iNC also leads on update cadence (every 5 days vs every 13 months). i's advantage is in-app purchases (none vs 2) and ratings volume (9 vs 1). On price, ads, device support and iOS requirement 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. iNC sells 2 in-app purchases, starting at $1.99 per month. i asks for nothing beyond the download.
iNC holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: i has 9 ratings behind it against 1, so its average is the more settled of the two.
i ships an update every 13 months, iNC every 5 days. The most recent releases landed on November 2, 2026 and November 9, 2026 respectively.
| Parameter | i | iNC |
|---|---|---|
| Price | Free | Free |
| Rating | 2.6 (9 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 9 — better | 1 |
| Update frequency | Every 13 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 | 16.0 |
| Further details — not scored | ||
| Size | 8 MB | 165 MB |
| Age rating | 4+ | 4+ |
| Developer | ilan TETRUASHVILI | 乐勇 刘 |
Customer experience
i
iNC
In-app purchases
i
No in-app purchases
iNC
- Subscribe Monthly7 Days trial$1.991 Month
- Subscribe Yearly7 Days trial$19.991 Year








