I searched for all posts from /r/SideProjects that contained these strings:

"I built", "I made an alternative to", "I created a clone of".

Most posts are <=1 year old.

Reddit API does not allow parsing older posts hence the amount "968" I wish I could parse more.

The list of clones of popular apps:

Loom (screen recording app) (6‼)

Typeform (form builders) (7‼)

Resume/CV apps (3)

Pastebin (5)

Habit trackers (12‼)

Link in bio (5)

Screenshot making tools (3)

Todo lists (3)

Bookmarking tools (8)

Website builders 29 (‼‼)

Notes taking tools (10‼ classic )

Health, fitness, and wellness apps (19‼)

Feedback gathering tools (10‼)

Time tracking and invoicing tools (4)

Patreon alternatives (2)

Bookmarking tools (8)

Twitter (16‼‼‼ wtf?)

Product Hunt (6‼)

Pomodoro timers: (1)

Categories:

Language learning (4)

Directory/list (7)

Chrome extension (21)

Crypto or decentralized (5)

Finance (15)

Dev tool (26)

Self-hosted (14)

Growth or marketing tool (11)

Open-sourced (37)

Some stats:

B2C: 69.8% ↔ B2B: 30.2% (please do b2b!!!)

AI tools: 108 (10.8%!)

Most boring title:

"How I stumbled upon my startup idea: A casual chat"

Most inspiring title:

"I taught people to code for 10 years. So I started my own learning platform for fun and it got REALLY BIG."

Least catchy title:

"I made an alternative free WordPress theme directory"

Most catchy titles:

"I made a multiplayer game, got beaten at my own game, then made a bot for my game so I could finally win"

"I made a chrome extension that makes music sound like it's coming from another room"

"Too lazy to post daily, so built an app to do it instead"