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Xin Jiang

Indie developer at Qumge: AI tools, small iPhone apps, and self-hosted open-source Rails apps.

You Asked ChatGPT to Quiz You Before the Midterm. Who Remembers What You Got Wrong

You Asked ChatGPT to Quiz You Before the Midterm. Who Remembers What You Got Wrong

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4 min read

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Your Anki Deck Covers Step 1, Not Your School's Block Exam

Your Anki Deck Covers Step 1, Not Your School's Block Exam

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4 min read
Ten Days to a Nursing Pharmacology Exam, Planned From Your Own Lecture Slides

Ten Days to a Nursing Pharmacology Exam, Planned From Your Own Lecture Slides

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5 min read
FAR in Five Weeks With a Full-Time Job, Built Around the One Hour You Actually Have

FAR in Five Weeks With a Full-Time Job, Built Around the One Hour You Actually Have

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4 min read
Blurting Shows What You Remembered, Not What You Left Out

Blurting Shows What You Remembered, Not What You Left Out

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4 min read
Switching clients or models should not mean rewriting your skills

Switching clients or models should not mean rewriting your skills

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16 min read
I published a SKILL.md and nobody installed it. Here's how to write one people actually keep.

I published a SKILL.md and nobody installed it. Here's how to write one people actually keep.

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16 min read
I picked the skill with more stars. Its repo had 46 skills tied for first place.

I picked the skill with more stars. Its repo had 46 skills tied for first place.

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15 min read
Five kinds of skills that earn their place in your agent

Five kinds of skills that earn their place in your agent

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16 min read
Your History Should Be a File You Own

Your History Should Be a File You Own

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7 min read
Your Agent Remembers the Stack, Not You

Your Agent Remembers the Stack, Not You

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7 min read
Your Agent Remembers Your Repo It Doesn't Know Your Dog's Name

Your Agent Remembers Your Repo It Doesn't Know Your Dog's Name

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7 min read
You Have Three Copies of SOUL.md and They Already Disagree

You Have Three Copies of SOUL.md and They Already Disagree

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7 min read
Three Agents Share One Soul Over MCP With Zero Tool Calls Per Turn

Three Agents Share One Soul Over MCP With Zero Tool Calls Per Turn

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8 min read
The Model Updated Overnight and the Persona You Tuned Is Gone

The Model Updated Overnight and the Persona You Tuned Is Gone

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6 min read
Ten Hours of Agents and Nobody Asked You Anything

Ten Hours of Agents and Nobody Asked You Anything

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7 min read
Tell Claude Code at Lunch and Hermes Brings It Up at Dinner

Tell Claude Code at Lunch and Hermes Brings It Up at Dinner

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6 min read
Monday in Your Terminal Thursday in Telegram and She Lived the Days Between

Monday in Your Terminal Thursday in Telegram and She Lived the Days Between

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5 min read
What Happens Between the Sidewalk and Your Vault

What Happens Between the Sidewalk and Your Vault

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5 min read
What ChatGPT Sees When It Reads Your Voice Notes Through SpeakPen

What ChatGPT Sees When It Reads Your Voice Notes Through SpeakPen

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4 min read
The Questions You Can Only Ask Your Notes After 90 Days

The Questions You Can Only Ask Your Notes After 90 Days

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4 min read
The One Question to Ask Any Tool Before It Touches Your Vault

The One Question to Ask Any Tool Before It Touches Your Vault

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7 min read
Record on the Walk, Ask Claude About It Before You're Home

Record on the Walk, Ask Claude About It Before You're Home

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3 min read
Presigned URLs and Permanent Notes Don't Mix

Presigned URLs and Permanent Notes Don't Mix

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6 min read
How a Thought From a Walk Becomes a Zettelkasten Note

How a Thought From a Walk Becomes a Zettelkasten Note

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5 min read
Connect SpeakPen to ChatGPT in Five Minutes and Stop Pasting Transcripts

Connect SpeakPen to ChatGPT in Five Minutes and Stop Pasting Transcripts

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4 min read
A Week of Walking Voice Notes, One ChatGPT Prompt, One Plan

A Week of Walking Voice Notes, One ChatGPT Prompt, One Plan

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4 min read
Your Winning Meta Ad Didn't Break Everyone It Reaches Has Already Seen It

Your Winning Meta Ad Didn't Break Everyone It Reaches Has Already Seen It

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4 min read
Your Store Gets Add to Carts and No Orders Find the Step Where the Funnel Leaks

Your Store Gets Add to Carts and No Orders Find the Step Where the Funnel Leaks

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3 min read
Your Shopify Product Page Has Six Photos and Not One Second of Video

Your Shopify Product Page Has Six Photos and Not One Second of Video

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6 min read
Your Salon Instagram Is a Portfolio New Clients Find You on Google First

Your Salon Instagram Is a Portfolio New Clients Find You on Google First

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3 min read
Your Friends Bought and Strangers From Meta Didn't Because That First Trust Was Borrowed

Your Friends Bought and Strangers From Meta Didn't Because That First Trust Was Borrowed

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4 min read
Why Agency Clients Say Let's Pause for Now and What to Show Them in the First 30 Days

Why Agency Clients Say Let's Pause for Now and What to Show Them in the First 30 Days

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3 min read
When a Client Asks Why They Shouldn't Just Buy an AI Tool

When a Client Asks Why They Shouldn't Just Buy an AI Tool

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3 min read
Use Real Work Not AI Images What to Film Without Faces and How to Ask Clients for Consent

Use Real Work Not AI Images What to Film Without Faces and How to Ask Clients for Consent

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3 min read
This Humidifier Ad Has Run for Three Years and Never Opens With the Humidifier

This Humidifier Ad Has Run for Three Years and Never Opens With the Humidifier

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1 min read
Stop Pricing UGC by the Video and Sell Agency Clients a Creative Retainer

Stop Pricing UGC by the Video and Sell Agency Clients a Creative Retainer

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3 min read
Stop Paying a UGC Creator to Find Out Your Hook Doesn't Work

Stop Paying a UGC Creator to Find Out Your Hook Doesn't Work

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7 min read
She Boosted One Instagram Post Lost 150 Dollars and Decided Ads Weren't for Small Shops

She Boosted One Instagram Post Lost 150 Dollars and Decided Ads Weren't for Small Shops

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5 min read
Running Local Marketing for Salon and Spa Clients One Workspace per Shop and a Monthly Report About New Clients

Running Local Marketing for Salon and Spa Clients One Workspace per Shop and a Monthly Report About New Clients

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4 min read
One MCP Server for a Dozen Platforms From Install to Your First Post

One MCP Server for a Dozen Platforms From Install to Your First Post

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2 min read
Let Your AI Agent Do Marketing Without Wrecking Anything

Let Your AI Agent Do Marketing Without Wrecking Anything

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3 min read
How to Reach People Within 5 Miles of Your Salon With Local Meta and TikTok Ads

How to Reach People Within 5 Miles of Your Salon With Local Meta and TikTok Ads

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3 min read
How a Small Agency Runs Ten Brands Without Dropping One

How a Small Agency Runs Ten Brands Without Dropping One

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3 min read
Her Earrings Kept Coming Out Wrong in AI Videos Until the Tool Stopped Drawing Them

Her Earrings Kept Coming Out Wrong in AI Videos Until the Tool Stopped Drawing Them

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4 min read
Four Weeks Before the Slow Season Win Back Regulars and Rebook Clients Before They Leave the Chair

Four Weeks Before the Slow Season Win Back Regulars and Rebook Clients Before They Leave the Chair

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4 min read
Cold Emails Nobody Answers Send a Sample Made for Their Product Instead of an Intro

Cold Emails Nobody Answers Send a Sample Made for Their Product Instead of an Intro

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3 min read
Built It and Nobody Came What Each Marketing Channel Actually Does for Solo Founders

Built It and Nobody Came What Each Marketing Channel Actually Does for Solo Founders

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3 min read
Before You Turn Off Your Meta Ads After a Dead Week Check Which of Three Things Happened

Before You Turn Off Your Meta Ads After a Dead Week Check Which of Three Things Happened

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4 min read
Ads Manager Said ROAS 2.6 and the Ads Still Lost Money That Week

Ads Manager Said ROAS 2.6 and the Ads Still Lost Money That Week

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3 min read
AI Video Tools Don't Know What Your App Looks Like So Demo the Real UI

AI Video Tools Don't Know What Your App Looks Like So Demo the Real UI

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3 min read
The Rule That Guarantees a Sync Tool Never Overwrites Your Edits

The Rule That Guarantees a Sync Tool Never Overwrites Your Edits

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6 min read
Audited on a skill means 30 regexes. It is not a guarantee

Audited on a skill means 30 regexes. It is not a guarantee

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16 min read
Voice notes Obsidian Claude Code: an idea pipeline that actually compounds

Voice notes Obsidian Claude Code: an idea pipeline that actually compounds

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2 min read
"iPhone storage full" but your photos are in iCloud? What's actually going on

"iPhone storage full" but your photos are in iCloud? What's actually going on

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2 min read
Why AI characters drift when you switch models (and what a persistent one needs)

Why AI characters drift when you switch models (and what a persistent one needs)

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2 min read
On-device by default: what I learned building a storage cleaner and a medical records app for iPhone

On-device by default: what I learned building a storage cleaner and a medical records app for iPhone

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3 min read
Habit apps shouldn't punish you: design rules from shipping four small iPhone apps

Habit apps shouldn't punish you: design rules from shipping four small iPhone apps

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3 min read
Skill, MCP server, or paid capability? Getting paid per call when AI agents use your API

Skill, MCP server, or paid capability? Getting paid per call when AI agents use your API

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3 min read
Building self-hosted, single-tenant Rails apps for small manufacturers

Building self-hosted, single-tenant Rails apps for small manufacturers

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3 min read
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