LobsterClass
Open the app
Paste your script. LobsterClass turns it into memorization drills, a schedule that counts down to your date, and an AI that plays the person across the table — then tells you how you actually did.
No signup. Nothing leaves your browser. The drills work offline and with no API key.
You've got material saved. Pick up where you left off.
Back to practice →Three steps, about two minutes to set up.
Pick a goal and the whole app re-labels itself — the prompts, the roleplay characters and the grading rubric all change.
Every mechanic here exists because the memory research says re-reading your script doesn't work.
People who kept testing themselves held near 80% a week later; people who re-read after one success dropped to the mid-30s (Roediger & Karpicke). So the app never just shows you the text.
Cold recall fails on day one because there's nothing to pull on yet. Blanking out progressively more words is what works on freshly-learned material (Fiechter & Benjamin, 2018).
The best gap between sessions is roughly 10–30% of the time you have left (Cepeda et al.), so the schedule compresses as your date approaches — and stops the evening before, because sleep does the consolidating.
Rehearsing under mild pressure inoculates against choking (Beilock & Carr, 2001). So the app interrupts you, times you, and argues back.
The memorization half is free and always will be. The AI half costs whatever Anthropic charges you — we don't mark it up, because right now we don't touch it.
Everything that doesn't need a model.
Adds the AI roleplay and grading.
Roleplay without getting an API key at all.
No. There's no signup, no email, no password. Your script and your progress live in your browser's local storage on the device you're using. That also means they don't follow you to another device automatically — Setup has a transfer code you copy and paste to move everything across.
It stays in your browser. The only thing that ever leaves is what you send to Anthropic during an AI roleplay, using your own API key — that's a direct call from your browser to their API, not through us. If you never turn on roleplay, nothing leaves your device at all.
Robotic is what half-memorized sounds like — when you're still hunting for the next sentence, and all your attention is on retrieval instead of the person in front of you. Once the skeleton is automatic, the thinking part of your brain is free to listen and improvise. That's the whole reason to do it.
How much of your own material you covered and what you missed, how you handled the pushback, and your delivery — then three specific fixes. It scores you against the script you pasted, not against a generic idea of a good pitch.
Yes, and it installs like an app — there's an install button in the footer of the app on Android, or use your browser's "Add to Home Screen". It works offline once installed. Use the transfer code in Setup to get your script across from your laptop.
You buy credits from Anthropic directly and a practice session typically costs cents rather than dollars, depending on how long you talk and which model you pick. You can set a spend cap in your Anthropic console. We never see the key or the bill.
Same method, different room — written to be useful whether or not you ever open the app.