Describe the result you want or paste a broken formula. Cellby asks which cells and which Excel version, then gives you the formula, a plain-English breakdown, a CHECK IT row you can test by hand, and a WATCH OUT line for blanks and version limits.

Built for the mistakes plain chatbots make: VLOOKUP on approximate match, ranges that slide when you fill down, month names in SUMIF, unique counts that break on a blank cell, and XLOOKUP for people on Excel 2019.

Need month-end and tax season prompts too? See the Late to AI accountant and bookkeeper prompt pack. Cellby is for formulas.

Plans
Every plan downloads the same full kit: instructions, a dated formula notes file with version rules and old-Excel swaps, 5 worked examples, and Write, Fix, Explain, Convert and Clean up modes.

• Basic $15 one-time
• Standard $25 one-time
• Pro $39 one-time
• Updates (monthly) $12/mo: the same full kit, billed monthly. Cancel anytime in Whop, 2 clicks.

What it won’t do: open your file, invent your columns, or promise a formula is right without the check row.

Instant download. See the store’s refund policy.

Support: imlatetoai@gmail.com
Unofficial, not affiliated with Microsoft, Google, OpenAI, Anthropic or xAI.