Run for the snacks.
Plan for the bonk-free part.
CarbTrip is a fueling copilot for runners who mostly want an excuse to eat gummy bears at mile 8. We map your route, your favorite snacks, and your metabolism — and tell you exactly when to chew.
A fueling copilot that actually gets your snack drawer.
Six small tools, one big idea: the best fuel plan is the one you'll actually put in your mouth.
A snack library that knows you
Rate treats by sweetness, texture, and how fast they hit. CarbTrip picks the ones you'll actually chew at mile 9 — not the gel you keep pretending to like.
Browse snacksRoute-aware fuel timeline
Import a GPX, sketch a loop, or just describe today. We drop snack pins mile-by-mile, drag-to-retime, and rewrite the 'why' note when you shuffle them.
Plan a runBonk-zone projections
A live energy curve estimates when your glycogen will file a complaint. Red bands = plan a snack here. Or don't. We're not your coach. (We kinda are.)
See the mapWatch-friendly haptics
A gentle buzz at mile 4.5 that means 'gummy bear, now.' No looking at your wrist mid-stride, no third-party math.
Recap + logbook
Log how you felt (bonk / almost / crushed), and CarbTrip retunes future targets. Compare runs side by side — planned vs. actual, week over week.
Open logbookBring-your-own ChatGPT
One tap opens a pre-filled prompt that stress-tests your plan against your goal, elevation, and fueling history. Human + LLM + gummy bear.
Sports nutrition, minus the influencer.
CarbTrip's model is built on the same carbohydrate-oxidation research your favorite sports dietitian keeps citing — glucose-fructose 2:1 blends, 60–90 g/hr for >90 min efforts, gut-training progression. We just wrapped it in a UI that respects your love of Swedish Fish.
- ref Jeukendrup, 2014 · multi-transporter carb oxidation
- ref Costa et al., 2017 · exercise-induced GI syndrome
- ref Burke, 2021 · fueling for the work required
* Numbers derived from your run history + published carb oxidation curves. Not medical advice. Definitely not an excuse to skip breakfast.
Runners, but honest about the candy.
"I used to bonk at mile 10 like clockwork. Now I bonk at mile 22, which is a much fancier problem."
"It told me to eat a Sour Patch Kid at mile 6 and I've never trusted software more."
"Finally, a running app that doesn't shame me for putting gummy worms in my flip belt."
Free to fuel. Pro for the science-y bits.
- ✓ Snack library + personality stats
- ✓ Route drawing + describe-today
- ✓ Fuel timeline with drag-to-retime
- ✓ Post-run recap + logbook
- ✓ Everything in Free
- ✓ Bio-analytical Nerd Stuff Panel
- ✓ Bonk-zone projections + energy curve
- ✓ Apple Watch haptics + live prompts
- ✓ Redemption-run auto-planning from recap misses
- ✓ Beautiful share cards (route + recap posters)
14-day free trial · cancel any mile
Real questions from real snack people.
Is this actually science, or just gummy bear propaganda?+
Both, and we're proud. The fueling math tracks published carb-oxidation research; the vibes are ours.
Do I need a fancy watch?+
No. CarbTrip works fine as a phone-in-armband experience. Apple Watch haptic prompts are a Snack Pro nice-to-have.
What if my favorite snack isn't in the library?+
Add it. Rate its sweetness, chew factor, and how fast it hits — CarbTrip works out the carbs so you don't have to.
Will this replace my coach / RD?+
Nope. But it'll make the fueling conversation with them 10x more specific — and it'll stop you bonking at mile 9 in the meantime.