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Yohei Profile picture
@yoheinakajima
Jan 18, 2023 • 23 tweets • 11 min read • Read on X
Scrolly
It's been a blast building on #gpt3 since August. 😆

I've built and shared a few dozen apps and prototypes.

I often get asked this, so...

Here's a list of some favorites! 👇
1) ⚡️Official @OpenAI x @zapier integration

This is the most popular by far.

Originally an unofficial integration I built for myself, it is now powering the next generation of #AI x #NoCode tools.

2) 🔀Fuzzy Compiler

Turns "fuzzy/sloppy" code into clean code.

It speeds up my build a ton. It's mobile optimizes so I can generate code and add to Replit mobile app while I'm bouncing our baby down in the Ergo.

3) 🔕Error Analyzer

Analyzes error codes and spits out analysis + fixed code.

I don't use this as often, but helpful in debugging if my Fuzzy Compiler code doesn't work right.

4) 🕳️Mini Yohei - Founder Portal

This is a series of AI services for our portfolio companies in our founder portal.

Excited to add lots more!

5) 📄Deck Parser

Scrapes a PDF deck and extracts structured data.

Works on startup decks and VC decks.

6) 📰Due Diligence Support Tool

Identifies key risks based on a startup description.

This September version has improved a lot since, and...

7) ✍️AI Memo Drafting Tool

I combined the deck parser + DD support tool + more to build this.

This tool can draft an AI investment memo from a URL, description, or deck.
8) 📩School Email Summarizer

I made a personal web app that shows me summaries of all emails from my kid's school.
9) 📨emails.wtf

Then, I built a generic version of this.

If you email any email address: eg. x@emails.wtf, you will get a summary emailed back to you.

Access all summaries from a web app.
10) 🪄Magical To-Do List App

Built a folder in @todoist where I can add emails I need to send, and the AI drafts an email in gmail for me.

11) 🛠️Geppetto.me

I built a #nocode AI tool with #nocode.

Built on @softr_io, Geppetto allows you to quickly prototype #gpt3 based apps.

A lot of the apps you see above were initially prototypes with this.

12) 💬Mini Yohei Chat Bots

I've built 4 chatbot prototypes for founders.

- Pitch Mode: collects data
- Mentor Mode: helps founders with questions
- Guidance Mode: guides founders through a workshop
- Mean Mode: gives mean feedback

Mentor Mode:
13) 💕Healing Poetry

Stressed?

This app will write a beautiful poem to cheer you about about whatever is stressing you out.

Zero data stored, go try it!
14) 📢GTM Strategies

Identifies 7 specific go-to-market strategies based on a startup description. Was used 500 times in the first ~24 hours.

15) 🗞️Daily Tech News

Set up a Zap that scraped Techmeme and send me a summary every day.

I read this most mornings :)

16) 👍Sentiment Analysis of ProductHunt

Added capability into our memo drafting tool to scrape ProductHunt and generate a sentiment analysis report.

17) 🧑‍💻LinkedIn Bio Generator

Similarly, this scraped a person's LinkedIn and generates a bio.

18) 📲GPT-3 Siri on iPhone

Published a template for "talking" to #gpt3 via Apple Shortcuts:

Relevant (but separate), this one is for Stable Diffusion:

My 3 yr old can use these :)
19) 🌀Latent Blog/Search

A fun experience on what a parallel internet might look like.

This blog and search engine are fake. They make everything up as you click through.

Latent Blog:

Latent Search:
20) 🖼️Startup Graphics Generator

Not #gp3, but it's @OpenAI so let's count it.

This tool generates 100 startup friendly graphics of varying styles from a simple prompt.

21) ❓Q&A with Airtable without embeddings

While I love semantic search, it's not always the best solution.

This @airtable extension is fed the schema of the whole Airtable and identifies the table and column to search based on any query.

There's a lot more where this came from!

Check them here: yohei.me (my build-in-public log)

I'll probably keep adding to this thread, because I'm clearly going to keep building 😁

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More from @yoheinakajima

Yohei Profile picture
Apr 29
AI is moving so fast, what should we even build?

We're excited about the opportunity for AI to accelerate abundance, help us better understand each other, and who knows what else Image
AI Agent Compliance & Governance Layer

Autonomous compliance agents evolve from tools into always-on governance infrastructure. As regulation accelerates (AI, ESG, cross-border data, tax), the bottleneck shifts from interpretation to continuous enforcement and board-level visibility.

These agents don’t just flag risk, they simulate decisions, propose compliant paths, and log everything as audit-ready memory. The “why” is simple: complexity compounds faster than headcount, and liability increasingly sits with executives who need real-time assurance. This becomes as core as ERP, but decision-aware.
Autonomous B2B Agents-as-a-Service

Entire business functions collapse into leased agent fleets: procurement, finance ops, legal workflows, even internal strategy. The shift is from SaaS (tools) to AaaS (outcomes), where companies pay for completed work, not software seats.

Second-order effect: org charts flatten and vendors become “shadow departments.” The enduring behavior is that companies optimize for efficiency and control, but now control comes from orchestration, not ownership of labor.
Read 19 tweets
Yohei Profile picture
Apr 28
we held our quarterly AI session with LPs last week where we go over ai trends and our experiments

sharing an abbreviated version here for anyone interested

🧵 Image
feels like forever ago, but had to include openclaw in q1 trends

coding models improved greatly in Q4 of 2025, early jan was ppl running claude codes in parallel, and clawdbot blew up late jan

models improvement + own computer (mac mini) + channel agnostic communication led to escaping dev communityImage
anthropic/dod coverage

was all over the news for a week in feb, but it's just one customer and anthropic got a lot of consumer awareness reaching #1 on app store, cover on time magazine, etc. (not sure if it's three years worth but you get the point) Image
Read 17 tweets
Yohei Profile picture
Jan 30
the bots have already set up private channels on moltbook hidden from humans, and have started discussing encrypted channels
they’re also playing around with their own encrypted language it seems
oh great they have a religion now

crustafarianism
Read 10 tweets
Yohei Profile picture
Nov 20, 2025
had our LP summit today, sharing slides for the state of VC market section

(obv not comprehensive, but what stood out to us.)
thx @peterj_walker for most of the charts

👇 Image
later stage vc is picking up since the dip, less so at seed/series A

deal count is trending down Image
highest share of dollars going to $100M+ rounds (almost 75%) Image
Read 13 tweets
Yohei Profile picture
Sep 22, 2025
announcing untapped capital fund II

pre-seed, generalist, ~$250k checks
untapped capital started in 2020 with the focus on investing in founders outside of typical networks - this is still very much core to who we are

(we do a lot of outbound sourcing)
through fund 2, we became increasingly top-down (vs being reactive)

we identify trends early, dig into niches, build unique and early conviction, then proactively market or reach out to relevant startups Image
Read 8 tweets
Yohei Profile picture
May 23, 2025
i heard @pocket is shutting down...

so i vibe coded* a quick free open source prototype with some AI features called KeepYard

(*still has issues, but i challenged myself to push this in one night)

link/github below 👇
you can try it here: keepyard.replit.app

(also sometimes works on keepyard.com but got stuck on CORS issue before bed)

it's a pretty straight forward bookmark manager with categories you can set, free form tags, favorites Image
you can add bookmarks from the web UI, which will grab metadata (description, image, etc.) for you Image
Read 8 tweets

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