An Invoicing App Built by Voice on a Highway Drive: Grok Bot in Their Tesla Ran the Coding Agents, 28 Tests and 6 Merged Pull Requests for About EUR 15
- Level Intermediate
- Setup1–3 hrs (estimated)
- Evidence Some evidence
- CostNot stated in source
- No-codeNo
What they did
On a drive from Brno to Prague and back, a Tesla owner used the Grok Bot built into their car to build their own small invoicing web app by voice, with no keyboard. Grok Bot acted as architect and developer, split the work among cloud coding agents, watched tests and merge conflicts, and checked in when it needed their approval. The app has PDF invoices with QR payment and a client link, company lookup from the Czech ARES registry, two-factor login, partial-payment tracking and an MCP server for dictating invoices. It came out to 28 automated tests and 6 merged pull requests for about EUR 15, and they moved their records over from the paid invoicing service they use.
How it went
X post by the user (Oct 28, 2026 UTC): built while driving a Tesla Model Y with in-car Grok Bot by voice; features listed; 28 automated tests and 6 merged pull requests; about EUR 15 total (their number); records migrated from their paid invoicing SaaS, still testing in real use
Worth knowing
- X post by the user (Oct 28, 2026 UTC): built while driving a Tesla Model Y with in-car Grok Bot by voice; features listed; 28 automated tests and 6 merged pull requests; about EUR 15 total (their number); records migrated from their paid invoicing SaaS, still testing in real use.
Prompt
Cleaned version rewritten from the source — not a direct quote.
I want my own small invoicing web app with only the features I use: [list, e.g. PDF invoices with a payment QR code, a public link for clients, company lookup from [registry], two-factor login, payment tracking including partial payments]. Act as the architect: break it into small tasks, hand them to coding agents, and keep the tests passing. Ask me before merging anything, and before anything that costs money beyond [budget]. Give me a short spoken-style update after each merged piece, since I'll be listening, not reading.
Recommended
Try it in Grok Bot
- Copy the prompt (button below).
- Open Grok Bot chat and paste it. Replace any [bracketed] placeholders.
- Connect the listed tools (Google Drive) as connectors when Grok Bot asks.
- If the task repeats, ask: "Make this a daily routine."
Alternatives: the same prompt works in Claude, ChatGPT Agent, OpenClaw.
Set it up
Tools: Google Drive · Stack: Grok Bot
- Read the original source for full context.
- Connect the tools your agent needs.
- Paste the prompt and replace [bracketed] placeholders.
- Run once manually and check the output before scheduling it.
Generic suggested steps, not from the source.
Evidence
X post by the user (Oct 28, 2026 UTC): built while driving a Tesla Model Y with in-car Grok Bot by voice; features listed; 28 automated tests and 6 merged pull requests; about EUR 15 total (their number); records migrated from their paid invoicing SaaS, still testing in real use
Source: X · 2026-10-28 · Verified by us: not yet · Report broken or outdated