r/roastmystartup

If a VC wrote a brutally honest memo on your startup today, would you actually want to read it?

Hey Guys,

I’ve been in VC for about ten years now, and there’s a pattern that keeps repeating: most startups don’t fail because the founders are lazy or dumb (most of the time), they fail because they don’t understand VC math or VC expectations. If you don’t understand how a fund thinks about scalability, return profiles, and portfolio construction, you can’t really tell a story that lands with investors, and often, you’re not even building toward the kind of scalability they need.

I’ve rejected a ridiculous number of startups purely because of this gap. On the flip side, I’ve mentored hundreds of founders in accelerators and incubators, and I always end up teaching the same thing: how to define and narrate scalability, how to adjust pricing, how to deepen the business model so that – at least on paper – it fits the logic a VC is actually underwriting. How you should aim at 100 mln ARR within a fund's lifecycle to be a fund returner etc ... 

What makes this more painful is that, inside funds, we write detailed investment memos on the “almost” cases, the ones that were close but still no. Those memos break down the company exactly the way we see it: risks, gaps, upside, what would need to be true for it to work. If founders could read those, the learning would be insane. But they never see them.

So I built a platform that basically does that from the inside out: founders answer a structured set of questions, and the platform audits their startup the way a VC would. I'd leverage loads of ressources and data i have collected over the years to strenghten the case. All the tralala of decent prompting, and solid/unique data assets
Founders get the kind of feedback they’d normally never receive: what doesn’t add up, what’s attractive, what’s just noise, what they need to fix or clarify before talking to investors. They can then use that to refine their story, rebuild their pitch, and generally stop wasting investor conversations.

I believe that most cases can be turned into relevant VC cases if heads are scratched enough. And i feel the tools that I built are kinda spot on. 

Here’s the problem: most founders don’t see the value of this upfront. They’re obsessed with “access”, they just want intros, meetings, a list of VC emails. When I tested this by plugging my own VC network into the platform, suddenly demand went up: people want to buy the access, not the understanding. My mission, educating founders to actually think like investors so they can win them, gets overshadowed by the simple “here’s a network” value prop.

It’s like founders are misunderstanding the problem. I’m a VC, I get that what people want doesn’t always line up with what they need, and demand rarely prioritises the deeper, more important work. But I feel it could be so much more helpful. 

I’m trying to reconcile this. How would you think about it? How do I keep the core educational piece as the main mission, while accepting that “access to investors” is what founders respond to first? Any thoughts on how to design or position this so that the education isn’t just a nice-to-have wrapper around a glorified investor list?

Also, if you are a founder, early stage, what are the painpoints, an investor can help you solve? As in what can i add to the platform so you'd get even more value ?

reddit.com
u/Cydonie — 9 hours ago

roast my startup: LeadsFromURL

i built LeadsFromURL because finding customers on reddit was so manual and slow. it's supposed to find people looking for products like yours but i need to know what sucks about it. tear it apart.

reddit.com
u/This-Independence-68 — 5 hours ago

Roast my startup: RentDuo — a platform where tenants and landlords review each other

I built RentDuo because renting feels like one of the biggest blind bets people make.

You can check reviews for food, drivers, and literally everything else… but when it comes to where you live, you’re just supposed to trust it works out.

So the idea is:

•	Tenants review landlords and properties

•	Landlords review tenants

•	Properties build a public reputation over time

Basically trying to add a “trust layer” to renting.

But I already know there are problems with this:

•	Fake reviews (obviously)

•	Landlords might hate it

•	Tenants might abuse it

•	Getting enough users on both sides feels like a chicken-and-egg problem

So yeah… go ahead and tear it apart.

What’s wrong with this? What would make this fail?

reddit.com
u/We-can-do-great — 6 hours ago
I'm 16, self taught, and just shipped my first iOS app to the App Store solo — brutal feedback welcome
▲ 7 r/roastmystartup+1 crossposts

I'm 16, self taught, and just shipped my first iOS app to the App Store solo — brutal feedback welcome

Been teaching myself Swift and SwiftUI for the past couple of years. Just launched Ino — a study tracker for high school and uni students with ATAR prediction, grade analytics, assignment tracking, and AI-powered study recommendations.

Built everything myself. Code, design, App Store submission, privacy policy, marketing — all solo. No team, no funding, no experience before I started.

It's free to download with a one-time AI upgrade available.

Would genuinely love brutal honest feedback on anything — the concept, the App Store listing, the pricing, the name, all of it.

App Store: https://apps.apple.com/us/app/ino-study-tracker-focus/id6761457214

What would you do differently?

u/Doldrumzss — 22 hours ago
I built yet another social media scheduler. Please tell me why it's doomed

I built yet another social media scheduler. Please tell me why it's doomed

Every morning I used to open Threads, then Instagram, then TikTok, then Pinterest, copy the same caption five times, forget which account I already posted to, and wonder why I chose this life.

I'm a solo dev, not a social media manager, but somehow I was spending more time posting than actually building.

So I did what any reasonable developer would do, instead of fixing the problem in 10 minutes with a spreadsheet, I spent some weeks building an entire app.

It's called Saki (https://usesaki.com/), and the idea is dead simple: you write your post once, pick which accounts it goes to, and that's it. One composer, all your platforms, done. You set up your weekly schedule once, and the queue fills itself.

Your old posts get imported automatically so you're not staring at an empty dashboard on day one. There's a calendar view so you can actually see the gaps in your content instead of pretending you have a strategy. Plus there's full APIs support with MCP coming soon so all the automations with Zapier, N8N and Make are even possible.

I won't pretend it's revolutionary. There's no AI writing your captions, no "optimal posting time" algorithm, no growth hacking magic. It's just a clean, fast tool that does the boring part of social media so you can stop context-switching between six browser tabs.

It's free to start, no credit card needed, and if you hate it, at least you'll have a good roast to write here.

Tear it apart. I want to know what sucks before strangers on Product Hunt do.

u/askides — 7 hours ago

App that writes your posts for you - lazy genius or useless?

You type a rough idea → app turns it into a clean post.

That’s it.

No scheduling, no analytics, no “grow your audience” stuff.

Just making posting easier.

Is this something you’d ever use, or does it scream “why would I need this”?

reddit.com
u/Good_Mango7379 — 8 hours ago
Roast our medication dose mood tracker — built by a psychiatric nurse and her dev husband

Roast our medication dose mood tracker — built by a psychiatric nurse and her dev husband

My wife is a psychiatric nurse. She got tired of patients not being able to answer "how have you been since we changed your dose?" — so she designed an app and I built it.

MediMood tracks mood, side effects, and blood levels against medication dose changes. The idea is that the 2-6 weeks after a dose adjustment are critical, and no app focuses on that window.

- Quick daily check-in
- Multi-medication dose timelines with mood/side effect overlay
- Doctor-ready reports
- Local-only storage (no cloud, no accounts)
- iOS ready, Android coming soon

Currently launched on IOS (Android pending). Tear it apart — what are we missing, what won't work, what's going to kill us?

iOS App

u/cgreendyk104 — 9 hours ago

Roast my iGaming "Anti-Scam" expected value calculator

The problem: Online casinos trap average players with 40x wagering requirements that are mathematically impossible to clear.

My solution: I built a web app that force-calculates the exact EV (Expected Value) of any casino promo code before you deposit. It tells you exactly how much money the house edge will eat before you are allowed to withdraw.

My competitors: Sketchy casino affiliate sites that just push fake reviews. I want to build a tool that actually forces transparency.

Please roast my UI and let me know if you think regular gamblers actually care about math, or if they just want to degen.

(Let me know in the comments if you want to try breaking the calculator, I'll drop you the URL).

reddit.com
u/AdOtherwise1170 — 12 hours ago
Roast Orbit — I built a tool that finds people you should talk to as a founder

Roast Orbit — I built a tool that finds people you should talk to as a founder

Built Orbit to solve a problem I kept running into — not knowing who to talk to when building something.

You describe what you're building, it searches GitHub, Product Hunt, Hacker News, Reddit, and LinkedIn — and surfaces people you should talk to, with a reason why and a suggested opener.

Live at orbittry.live — 3 free searches, no credit card.

Go ahead, tear it apart.

u/GlitteringForever107 — 23 hours ago

This is my first online tool: please roast my time-off planner for couples (please be brutal, I need the feedback)

So I built this thing called TimeOffCalendar (timeoffcalendar.com) and I honestly don't know if it's a real business or just a fancy solution to my own problem.

Here's the story. Every January, my partner and I sit down with a Google Sheet and try to plan our year off together. Sounds simple, right? Except I get 22 PTO days, she gets 25. I have Portuguese public holidays, she works for UK companies sometimes so different holidays. And we're trying to figure out when we're BOTH off at the same time so we can actually take trips together instead of wasting days separately.

After doing this manually for 3 years, I finally got annoyed enough to build something. Started super simple, just a calendar where we could both add our time off and see the overlap. Then I realized I needed to track how many days we each had left. Then I added public holidays for different countries because that was our exact problem.

Then other people started asking to try it and they had different needs. Someone works part-time and doesn't work Tuesdays, so I added custom weekend days. Someone else's company makes them take the week between Christmas and New Year but it counts against their PTO, so I added custom company holidays. It's basically grown from "what do WE need" to "what do couples/families need."

Right now it's live, completely free, 11 people using it (mostly couples, a few families). Built it with Next.js and Supabase. I'm a software engineer with 8 years experience but this is my first real attempt at building something people might actually pay for.

The competition is basically Google Sheets (manual and painful), enterprise PTO tools that are designed for managers not personal use, and some holiday optimizer tools that are single-user focused. Nothing really exists for the "I want to coordinate vacation days with my partner" use case.

I'm bootstrapped, working on this as a side project while I have a full-time job. Not raising money, not making money (it's free right now), and honestly not sure what the business model should be. Freemium? Subscription? Affiliate links to travel sites? I have no idea.

My customer acquisition so far has been posting on Reddit asking if people plan their PTO with their partners (got 35 upvotes and comments, about 75% said yes), then DMing people who complained about competitor tools, and word of mouth. It's slow and manual and probably doesn't scale.

I'm good at building and shipping things. I'm terrible at marketing and design (the UI works but it's ugly). I've never successfully built a business before. And I'm not sure if this is a "must have" or just a "nice to have" that people will use once and forget about.

So roast me. Is this market too niche? Should I pivot to B2B and sell to small companies instead? Is keeping it free forever killing any chance of building a real business? Am I wasting my time on something that'll never scale past a few hundred users?

I want brutal honesty. If this is a dead end, I'd rather know now.

reddit.com
u/JoaoRochaOnReddit — 12 hours ago
Roast my reading app — on-device TTS so you can read and listen to any EPUB at the same time

Roast my reading app — on-device TTS so you can read and listen to any EPUB at the same time

The product

Morph is an iOS reading app. Import any EPUB, pdf or web article, and you can read it, listen to it, or do both simultaneously with word-by-word highlighting synced to the audio.

The TTS runs fully on-device — no internet, no cloud processing, no usage caps. I rearchitected the Kokoro TTS model to run at 20x realtime on iPhone CPU without overheating the phone. The only other app with a local tts that sounds this good is Speechify and they cost 2x as much. The app also has an AI assistant that can answer questions about the book you're reading, in context.

Use case: anyone who reads ebooks and wants to listen too without buying a separate audiobook. People with ADHD/dyslexia who retain more with dual-channel input. Anyone who wants to "read" while commuting, cooking, working out.

The market

Audiobook market is ~$7B and growing 25% yearly. EPUB/ebook readers are a commodity. The gap is the middle, apps that do both reading and listening in one place.

The long term thesis is that people will no longer need to think or remember anything to live because AI will do it for them. But just as no one needs to go to the gym to survive, people want to. I predict the same will happen with books.

Competition

- Speechify ($139/yr): Like every other tts app, its build for listening, not reading. It turns anything in an audio book rather then enhancing the reading experience.

- Audible ($15/mo): great for audiobooks but forces you to buy the audiobook separately from the ebook. Two purchases for the same words.

- Kindle Immersion Reading: read + listen but requires buying both formats.

- ElevenReader: Cloud-dependent, much more expensive and same issue as speechify, too much focus on listening.

How Morph is different

- On-device TTS — no cloud, no internet required, no word caps

- Word-level highlighting synced to audio, not sentence-level

- One app for reading AND listening — import an EPUB once, do both

- $8/month or $50/year — 64% cheaper than Speechify annually

- No trial traps, no dark patterns

- Designed for reading and listening. Not just listening to books.

Stage

Just went live on the App Store. 2 active trials. No funding, no team, solo dev. I

Customer conversion strategy

Honestly, still figuring this out. Got the 2 trials from an Instagram post. Started posting on technical subreddits (r/TextToSpeech, r/LocalLLaMA) about the on-device TTS work — got attention but hasn't converted to downloads yet. Planning to have automated organic reels.

No ad budget.

Why me

Reading rewired my brain and changed my life for ever. That's why I give a shit about this problem. I think most people in my generation (Gen Z) are literally losing their cognitive function and I believe reading is the antidote.

I also built the everything myself, got Kokoro TTS running at 20x realtime on iPhone CPU when every other iOS implementation maxes out at 3x and overheats your phone. That's not something a competitor can just copy overnight. I have by far the best app for this on the entire app store. Its just about distribution.

If you want to check it out: https://apps.apple.com/us/app/morph-books/id6760332618

Roast away!

u/aminsweiti — 6 hours ago
Week