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Pitch Deck Writer for Seed Founders
Paste your notes, an old deck or a memo. Get every slide written, from problem to ask, with speaker notes and nothing invented.
River's pitch deck writer turns what you already have into a complete seed deck, written slide by slide in a document you can edit. Paste notes from investor calls, drop last year's deck or a product memo, and add your latest numbers. You get each slide's headline written as a claim, the few lines that belong on the slide, and speaker notes for what you will say out loud. Anything the deck needs that you did not give is marked for you to confirm.
Most deck tools start from a design template and leave the hard part blank: what to say. Others generate confident copy with figures nobody gave them, which falls apart at the first question. This writer works only from your facts, sizes the market from your own customers and prices, and names the weakest slides. When the words are right, River can build the slides in the same chat, and the investor read shows how a partner will react.
It is for first-time founders raising a pre-seed or seed round, and for repeat founders whose story has changed since the last deck they sent. Use it before you start outreach, or after a run of meetings where the same question kept coming up. Once offers arrive, the term sheet explainer reads each one clause by clause, and the SAFE and note conversion model shows what the round does to your ownership.
What a seed deck has to do
A seed deck has one job: getting you the next meeting with the partner. Partners often read it before they meet you, sometimes forwarded by someone who saw you pitch, so every slide has to make sense without you in the room. That is why headlines matter more than design. Read only the headlines in order, and they should tell the whole story: who hurts, what you built, the proof it works, why now, and what the money buys.
Sequoia's long-standing business plan outline still sets the order most investors expect: company purpose, problem, solution, why now, market potential, competition, business model, team, financials and vision. At seed, two changes usually help. Put traction early when it is your strongest point, because one dated number, such as paying customers this month, answers several later slides at once. And add a slide for the ask: the amount, the instrument and the milestone the money reaches.
The slides that lose investors are usually the ones built on borrowed numbers. A top-down market figure from an analyst report says little about your business; a bottom-up one does. For example, an illustrative 9,000 independent clinics paying $6,000 a year is a $54 million market you can defend line by line. The same goes for competition. A slide claiming no competitors tells a partner you have not looked, so name the spreadsheets and agencies customers use today.
How it works
Share what you have
Paste notes, drop an old deck or memo, and add your latest numbers in any form.
River writes the deck
Each slide gets a headline, the lines that belong on it, and speaker notes from your facts.
Confirm the gaps
Fill in each marked fact, and see which three slides are weakest and what would fix them.
Turn it into slides
Ask River in chat to build the presentation, rework a slide, or write the email that sends it.
What you get
- Every slide written from problem to ask, with a headline that states its point as a claim
- Speaker notes under each slide with what to say out loud and the numbers behind it
- Market size worked out from your own customers and prices, with the arithmetic shown in the notes
- Every missing fact marked for you to confirm, never filled with invented customers or metrics
- Slide text sized for how investors will see it, emailed ahead or presented live in a meeting
- The three weakest slides named in chat, with the fact that would make each one land
Common questions
Does it make the actual slides?
It writes the deck first, in a document, because the words are where most decks fail. Each slide has its headline, body text and speaker notes. When you are happy with them, ask River in the same chat to build the presentation, one slide per section using that text. You can also paste the text into Google Slides, PowerPoint or Canva yourself.
How many slides should a seed deck have?
Usually between ten and fourteen, and fewer is fine. A market or competition slide with nothing real behind it does more harm than a missing one, so River drops slides you cannot support yet rather than padding them. Detail an investor might ask about, but the story does not need, moves to an appendix section at the end.
What if I have no traction yet?
Then the deck leans on the proof you do have: customer conversations, letters of intent, a waitlist, a pilot, or why your team is unusually placed to solve this. River writes the traction slide around what is real and labels it honestly, for example "12 discovery calls, 9 named the same problem", instead of dressing up projections as results.
Will it invent numbers to fill the market slide?
No. It builds the market size from figures you give, such as how many customers could buy and what they would pay, and shows the arithmetic in the speaker notes. When a published figure would help, River looks it up and names the source in the notes. Anything it cannot support is marked for you to confirm.
Should the deck I email differ from the one I present?
Yes. A deck sent ahead has to stand on its own, so its slides carry a little more text. A deck you present can be sparse, because you are the narration. Pick how investors will see it and River sizes the slide text to match, keeping the fuller explanation in the speaker notes either way.
Can it help with the rest of the round?
Yes. In the same chat it can write the cold email that links the deck, or review the finished deck as a seed investor would. For legal paperwork such as a SAFE or an advisor agreement, the founder document studio starts from published standard forms and fills them with your terms.
Built by
Chandler Supple
Co-founder & CEO, River
Chandler has spent the last six years working in AI, building tools for millions of users and Fortune 100 companies. In 2025, he co-founded River to build a new kind of operating system for AI agents.
Pitch Deck Writer for Seed Founders
Describe what you need, add any files you have, and your workspace opens with the work already underway.