Say what you ate.
Get an honest range.
Speak or type a meal — any language, no forms. BurnWeek's engine cross-checks multiple nutrition databases and answers with a low, a likely and a high, combined with PERT like an engineering estimate. Never a fake-exact number.
● AI at the center, not an afterthought — every log flows through the model first.
- Grilled chicken breast230–26046 g150 g
- White rice, cooked215–2554 g180 g
- Broccoli28–343 g90 g
- Olive oilquick check60–800 g8 g
Logging is a sentence, not a form.
No searching, no dropdowns, no chat back-and-forth. You talk; it counts; you correct.
Type it or speak it
Hold to talk in any language — even mixed. Photos and barcodes add accuracy when you want them, but they're never required.
The engine cross-checks
AI reads your sentence, pulls candidates from multiple nutrition databases, and estimates every ingredient three ways: low, likely, high.
Adjust, then log
Every estimate breaks into ingredients with editable weights — change the grams and calories & protein recompute live. Log in one tap, undo in one more.
The whole day, in your pocket.
Real screens from the iPhone app — honest ranges, editable to the gram, logged in one tap.
A tracker that shows its error bars.
Your dinner is not exactly 642 calories, and no app knows otherwise. BurnWeek estimates every ingredient three ways, then combines them with PERT — the three-point method engineers use to estimate projects. Independent errors partly cancel, so combined ranges get tighter, not wider.
One chicken & rice bowl, two ways to add its four ingredients
kcal · same meal, same ingredient estimates
Same honesty, less noise. You'll see it all day: 470 left · 414–526 — a range you can actually plan dinner around.
One estimate, many sources.
The model never guesses alone. Every log is enriched before a number reaches you — accuracy over vibes.
Your day follows you.
Bring your own UI if you like.
The app is one door. The engine is the product — and it answers wherever you already are.
Log from ChatGPT private beta
BurnWeek is a ChatGPT app. Tell ChatGPT what you ate — it logs to your day, shows what's left and adjusts grams, powered by the same engine over MCP. Any MCP-capable assistant can connect the same way.
Estimate over the API early access
The same estimation engine, over an API. Build your own logger — a shortcut, a watch face, a spreadsheet. Your UI, our honest numbers.
# POST /api/log
"two eggs and toast"
{
"calories": { "low": 264, "likely": 290, "high": 318 },
"protein_g": { "low": 16, "likely": 18, "high": 20 },
"items": [ …editable, per-ingredient… ]
}iPhone and web today.
Request early access.
We invite in small cohorts so every estimate gets real attention. Tell us where to send your invite.
iOS (TestFlight) + web today · Android later · beta emails only, nothing else
Questions, answered honestly.
The same honesty as the estimates — no dark patterns, no fine print surprises.
Is there a calorie tracker that shows a range instead of one exact number?
Yes. BurnWeek shows calories and protein as an honest range — low, likely, and high — instead of a single fake-exact number. It estimates each ingredient three ways and combines them with the PERT method.
Can I log food by voice or photo?
Yes. You can describe a meal by voice or text with no forms, and add a photo or barcode when you want extra accuracy. All of it flows through one AI estimate.
Does BurnWeek work inside ChatGPT?
Yes. BurnWeek is a ChatGPT app and an MCP server, so you can log meals from ChatGPT or any MCP-capable assistant. It logs to your day, shows what's left, and adjusts grams, powered by the same estimation engine. This is currently in private beta.
Does it support languages other than English?
Yes. You can log a meal in any language, and even mix languages in one sentence — for example "капучино and a butter croissant."
Is there an API to build my own calorie logger?
Yes. BurnWeek offers an estimation API (early access): send a natural-language meal and get back low/likely/high calories and protein plus an editable per-ingredient breakdown, so you can build your own interface — a shortcut, a watch face, a spreadsheet.
What is PERT and why does BurnWeek use it?
PERT is the three-point estimation method engineers use to combine a low, likely, and high estimate. BurnWeek uses it because independent ingredient errors partly cancel, so the combined day range gets tighter and more honest than naively adding all the lows and highs.
Is BurnWeek on iPhone and Android?
BurnWeek is in beta on iPhone (via TestFlight) and on the web at burnweek.fit. Android is planned next and is not available yet.
How accurate are the calorie estimates?
BurnWeek is deliberately honest about uncertainty. Rather than pretend to know an exact number, it cross-checks multiple nutrition databases and reports a range; you can refine any ingredient's weight and the totals recompute live.