RobaerOS vs. Carta: SAFE Review vs. Cap Table Management
Carta is the default cap table tool for most US startups. RobaerOS is a SAFE-review tool that reads the document, extracts terms, scores risk, and models dilution. They sound similar. They aren't.
This page does an honest head-to-head: where the two tools overlap, where they don't, what RobaerOS does that Carta doesn't, what Carta does that RobaerOS can't, and how most founders end up using both.
TL;DR
- Different jobs. RobaerOS reads the SAFE document and explains what it says; Carta tracks equity ownership after the SAFE is signed. They answer different questions at different moments of a fundraise.
- Use RobaerOS first, before signing. Drop in the SAFE, get term extraction, risk scoring, red flag detection, and a dilution preview in under 60 seconds — without paying a lawyer or manually transcribing into a spreadsheet.
- Use Carta after signing, for ongoing admin. Once you've decided to sign, Carta owns the cap table, the option plan, the investor records, and the 409A valuation pipeline.
- Founders who already use Carta get the biggest benefit from adding RobaerOS: instant term review on every incoming SAFE before it ever touches the cap table.
AI-Powered SAFE Term Review
Upload a SAFE and get plain-English analysis, risk scoring, red flag detection, MFN / pro-rata identification, and dilution modeling in under 60 seconds.
Cap Table & Equity Administration
Tracks equity ownership, manages option plans, holds investor records, runs 409A valuations, and produces board-ready reports after the SAFE is signed.
RobaerOS vs. Carta: Feature Matrix
| Feature | RobaerOS | Carta |
|---|---|---|
| Turn time | <60 seconds | Minutes (manual entry) |
| Reads the SAFE's legal language | Yes | No |
| Term risk scoring | Yes | No |
| Red flag detection (MFN, side letters) | Yes | No |
| Plain-English term explanation | Yes | No |
| Dilution modeling (pre-sign) | Yes | Partial (after entry) |
| Cap table management | No | Yes |
| Option plan administration | No | Yes |
| Investor records & KYC | No | Yes |
| 409A valuations | No | Yes |
| Board-ready equity reports | No | Yes |
| Best for | Pre-sign review, term understanding, red flags, founder prep | Post-sign cap table, ongoing equity admin, investor reporting |
Where RobaerOS and Carta Overlap
The honest truth: there's a narrow slice where both tools do something similar, and it's worth being precise about that slice so you're not paying for two tools to do the same job.
Post-money dilution modeling. Both RobaerOS and Carta can tell you what an investor's post-money ownership will be after their SAFE converts. RobaerOS does it the moment you upload the SAFE, before you've entered anything anywhere. Carta does it after you've transcribed the SAFE's terms into the cap table — a process that takes 15–30 minutes per document and assumes you've correctly read the language yourself.
Carta SAFE modeling vs. RobaerOS. Carta's SAFE modeling feature lets you sketch a hypothetical SAFE on your cap table — "what if an investor puts in $250K at a $5M cap?" That's useful for planning. It is not a substitute for reading an actual SAFE document you just received, because Carta's modeling doesn't take the document's actual language as input. If the SAFE contains a 5% MFN, a non-standard pro-rata side letter, or an unusual conversion trigger, Carta's modeling won't surface it — because no model can read language it doesn't have access to.
Outside that overlap, the two tools address genuinely different problems.
What RobaerOS Does That Carta Doesn't
RobaerOS exists because there's a step in every fundraise that cap table managers don't perform: reading the SAFE before you sign it. That step is currently done by lawyers (slow, expensive), or not at all (fast, risky).
Term extraction from a real document
Upload a SAFE in any format — PDF, Word, pasted text, or a Carta export — and RobaerOS extracts the cap, discount, MFN clause, pro-rata language, conversion trigger, and any side-letter material. The output is a plain-English breakdown of what the document actually says, including provisions the founder didn't know were in there.
Risk scoring by term
Each extracted term is scored against benchmarks drawn from thousands of SAFA agreements. A discount of 20% on a $3M cap is a different proposal than 20% on a $10M cap. A pro-rata clause with a 30-day window is a different proposal than one with a 90-day window. RobaerOS tells you what each number means in context.
Red flag detection
Non-standard provisions — shadow MFN clauses, custom pro-rata mechanics, unusual conversion triggers, side-letter grants — show up in plain English with explanations of why each is unusual and what to ask about it. Founders who skip this step cite the same regret: "I wish I'd asked about the side letter before signing."
Dilution preview without data entry
RobaerOS shows what an investor's post-conversion ownership will be at a modeled Series A price, without requiring you to enter anything into a cap table. This is the moment founders most often mis-model — because they're computing dilution on terms they read once and forgot, rather than on the document itself.
Side-by-Side: Reviewing an Incoming SAFE
Carta workflow: Receive SAFE → forward to lawyer → wait 3–5 days → receive $1,500 memo → manually enter terms into Carta's cap table → 15–30 minutes of keystrokes per document. Conversion model is now accurate if the terms were correctly extracted.
RobaerOS workflow: Receive SAFE → drop it in RobaerOS → 60 seconds → see extracted terms, risk scores, red flags, dilution preview. If anything is non-standard, forward only that SAFE to a lawyer with the list of questions. If clean, enter the confirmed terms into Carta.
Both workflows reach the same cap table. Only one of them tells you what the SAFE actually says before the cap table entry — and only one of them flags the terms the second pair of eyes would have surfaced anyway.
What Carta does that RobaerOS doesn't
RobaerOS doesn't track ownership beyond a single SAFE's conversion preview. It doesn't hold your option plan, your 83(b) elections, your investor ledger, your board-ready reports, or your 409A valuation pipeline. Those are Carta's job, and Carta does them well. The mistake founders make is treating one tool as a substitute for the other.
When to Use RobaerOS vs. When to Use Carta
- Use RobaerOS the moment a SAFE lands — before anything else. Get the plain-English read, the risk score, the red flags, and the dilution preview.
- Confirm the terms with a lawyer for any non-standard SAFE — RobaerOS surfaces which ones those are, so the lawyer conversation is targeted, not exploratory.
- Sign the SAFE. At this point you know what you're signing.
- Enter the confirmed terms into Carta. From here, Carta owns the cap table, the option pool, the investor records, and the next 409A.
- Next SAFE? RobaerOS again. Each incoming SAFE is reviewed in 60 seconds; only the unusual ones go to a lawyer; every one of them updates your Carta cap table when signed.
Treating a cap table tool as a term-review tool. Cap table tools (Carta, AngelList, Captable.io) are designed for post-decision modeling. None of them reads the SAFE document's language, identifies non-standard provisions, or surfaces terms the cap table entry won't catch. Use a dedicated review tool before signing, then update the cap table after.
See a real SAFE analysis — free
Drop in your SAFE. Get the plain-English read, the risk score, and the dilution preview in under 60 seconds. No account required.
Analyze My SAFE — FreeFrequently Asked Questions
Does RobaerOS replace Carta?
Can Carta analyze SAFE terms before I sign?
Is RobaerOS compatible with Carta exports?
Do I need both RobaerOS and Carta?
How long does RobaerOS take vs. entering a SAFE into Carta?
Get the RobaerOS vs. Carta Buyer's Guide
One-page summary: how to use RobaerOS and Carta together across a rolling seed round, when to use each, and the workflow that gets you from SAFE receipt to signed cap table cleanly.