An independent iOS developer and photographer in China, with 14 apps on the App Store since 2021, from a construction-safety inspector to a diary for socks.
Each of these has grown its own website. Tap through for the full story, or go straight to the App Store.
A construction safety inspection app for US site supervisors, built on my own years managing construction sites. Circle the hazard in a photo, review the findings and suggested OSHA references, send a corrective-action PDF, then keep the reply and after-photos with the original issue until it is verified closed.
Chinese astrology for anyone who knows their sun sign and wants to go deeper. Build your BaZi chart, read your Day Master, check today’s five-element energy, ask the I Ching and compare compatibility.
“Très belle application pour apprendre le Yi King et s’approprier les 5 éléments à travers le Bazi… le texte malgré la traduction garde sa poésie et sa justesse.” A beautiful app for learning the I Ching and making the five elements your own through BaZi. Even in translation, the text keeps its poetry and precision.
Log weight and measurements for your waist, hips, chest or any custom area, and watch a private 3D body model follow the numbers you save, without using photos.
4.5 ★ average rating on the App Store
Photograph a pair, or lay out several at once. SockDiary finds the socks, removes the background on your iPhone, and turns your drawer into a visual collection you can wear, log and share.
60K views on a single Douyin video
FitEdit2026 Repair a workout when the watch died, the timer ran on, or you forgot to start. 
undervoice2026 Speak softly into your iPhone; the text lands at your Mac’s cursor. 
UseUp2026 Scan food packages on-device and see what to use up first. 
GemStep2026 A step counter that grows a one-of-a-kind 3D crystal. 
BuzzCam2026 A ProRAW burst camera and self-timer for solo shooters. 
JustPad2025 One endless page for brain dumps. No folders, no titles. 
MemoryLens2025 Overlay an old photo on the live camera to recreate the shot. 
BallDecide2025 A Magic 8 Ball with a Home Screen widget and haptics. 
SaltTrack2025 Track daily salt intake against the WHO’s 5 g guideline. 
TeaTeaAvatar2021 Gradient and emoji avatars that tell your group chats apart. 
Every app on this page is something I made as an independent developer. I go by ldjing almost everywhere online.
I like focused, well-made apps that do one thing well and then get out of the way. Behind the lens I’m drawn to golden-hour light, urban architecture and landscapes at dawn. Photography, for me, is about learning to see, and it’s the same habit I bring to an interface.
A few frames from walks, trips and quiet afternoons, plus one watercolor.
Liang Dongjing (梁东景), known online as ldjing, is an independent iOS developer and photographer based in China. He has published 14 iPhone apps on the App Store since 2021.
Cirqify, Daoly, Contura, SockDiary, FitEdit, undervoice, UseUp, GemStep, BuzzCam, JustPad, MemoryLens, BallDecide, SaltTrack and TeaTeaAvatar. Each one is listed on this page with a link to its website or App Store listing.
Cirqify, released on the App Store in October 2026. Circle a hazard in a jobsite photo and get a corrective-action report. He built it on his own years of construction site management.
Contura, a 3D body measurement tracker, holds a 4.5-star App Store rating: it shows people how their shape changes even when their weight and BMI do not. SockDiary took off on Douyin, where a single video passed 60,000 views, and its sock diary continues on X at @sockdiary_jp.
Cirqify, Daoly, Contura, SockDiary, FitEdit, undervoice, UseUp, GemStep, BallDecide and TeaTeaAvatar are free to download. BuzzCam ($4.99), JustPad ($19.99), MemoryLens ($5.99) and SaltTrack ($4.99) are paid apps, at US App Store prices.
The fastest way is X, at @ldjing. His code is on GitHub as ldjing.
Questions about an app, an idea for one, or just a nice photo: X is the fastest way to reach me.