J-Camera
Lit close-up camera & loupe
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Split-image focus, four strengths at once. See whether the detail is really there before you press the shutter.
J-Camera is an inspection tool, not a general-purpose camera.
It is built for one job: looking closely at small things — a solder joint, a hairline scratch, a serial number, a fabric weave — with the torch on and real control over focus.
SPLIT-IMAGE FOCUS
A circle sits in the centre of the frame. Inside it, the live image runs through an edge-enhancement formula and is shown as four quadrants at four different strengths. Bright scenes need a gentle setting; dim ones need a strong one — instead of guessing, you see all four side by side and pick the one that reveals detail. Press and hold to cycle through five formulas.
FREQUENCY HISTOGRAM
A logarithmic frequency plot, not a brightness histogram. When the right-hand side stays high, fine detail is still present — which is what "in focus" actually means. It is the difference between believing you are sharp and knowing it.
FOCUS YOU CAN DRIVE
Tap anywhere to move the focus point. Switch to manual and drive the lens by hand. The focus ring is grey while the lens is moving and red once focus is locked — no text to read, just a colour.
READOUTS THAT STAY READABLE
Shutter, ISO, zoom and focus are drawn as the inverse of whatever is behind them, measured live. On a blown-out white surface the text turns black; on a dark one it turns white. Nothing is dimmed to make room for it.
MANUAL CONTROL
Shutter, ISO, colour temperature, tint, focus distance, zoom and exposure compensation. Each control shows whether it is on Auto or being held. Anything the current lens cannot do is greyed out rather than failing silently.
PORTRAIT DEPTH
On devices with more than one rear camera, portrait mode measures depth and simulates a shallow depth of field, with a live aperture slider. Two windows show the depth map and the blur mask actually being applied — you can see what the machine measured, not just the result. Each shot saves two photos: one with the original pixels and the depth map, which the Photos app can re-edit with its own aperture slider, and one with the blur already applied.
LiDAR CALIBRATION
On models with a LiDAR scanner, record a few reference distances and the focus-distance readout becomes real units instead of an estimate.
Five languages. No account, no sign-in, no data leaves your device.
J-Camera is free and supported by occasional full-screen ads shown after a photo is saved — never while you are framing or focusing. Ads are non-personalised; the app does not ask for tracking permission.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, YUAN YU NIU, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- YUAN YU NIU
- Size
- 5.4 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 4 more
- English, Japanese, Korean, Simplified Chinese, Traditional Chinese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 John Niu