How do I get started?

Start with the free TDEE calculator at https://nanorhino.com/tdee — a 5-minute AI interview (no app, no account) that gives you the calories you actually burn plus a starter plan. Then put it to work with a coach by text: SMS is live in the US at (915) 277-7888, with WhatsApp, iMessage, and Telegram coming soon. Already know your numbers? Text START to (915) 277-7888 to jump straight in.

Do I need to download an app?

No. SMS is the primary way to use NanoRhino — it lives in your Messages app. We also offer an optional iOS app for users who prefer it, but it's not required.

Is there a message limit? What does it cost to text?

NanoRhino SMS coaching is free for up to 50 messages per day. Standard carrier message and data rates may apply. If you exceed your daily free allowance, additional usage fees may apply — we'll always notify you before any charge.

How do I unsubscribe?

Reply STOP at any time to unsubscribe. Reply HELP for assistance. You can re-enroll anytime by texting START again.

What is Link Heart Limited?

Link Heart Limited is an AI health technology company based in Houston, Texas. We build NanoRhino, an AI-powered weight loss companion that provides personalized nutrition coaching with a unique pay-for-results model.

NanoRhino is an AI weight loss coach. Think of it as a personal AI nutritionist, AI dietitian, and AI calorie counter rolled into one. It starts with a free TDEE calculation, turns that into a personalized plan, and then coaches you by text at (915) 277-7888 — answering questions, logging meals you text or photograph, and adjusting as you go. No app required. You only pay $10 per pound you actually lose.

Is NanoRhino a free AI weight loss coach?

Texting NanoRhino is free for up to 50 messages per day, and you only pay if you actually lose weight — $10 per pound, capped at $500 total. There's no subscription, no upfront fee, and no charge if the weight doesn't come off. So functionally it's a free AI weight loss coach until you get results, then it's a results-based fee.

How does pay-for-results pricing work?

NanoRhino charges $10 per pound you lose, capped at $500 total. If you don't lose weight, you don't pay. This aligns our incentives with your success — we only succeed when you do.

Is NanoRhino private and secure?

Yes. NanoRhino is a private, judgment-free space — your conversations live in your Messages app. There are no social feeds, no posting, and no sharing. Your health data is encrypted, never sold, never shared with third parties, and never used for advertising. You can request deletion of all your data at any time.

How is NanoRhino different from other weight-loss tools?

Most apps make you tap through screens to log calories or follow generic meal plans. NanoRhino is a conversation: text a meal photo and get a calorie estimate back; vent about a hard day and get coached through it. It's like having a private nutrition coach on speed dial — at a fraction of the cost.

How is NanoRhino different from apps like MyFitnessPal or Cal AI?

Apps like MyFitnessPal and Cal AI are trackers — they tell you the calories in your meal and stop there. NanoRhino logs meals too (text or photo a plate over SMS), but the product is the coaching: it sets your targets, checks in weekly, explains why the scale moved, and adjusts your plan — and you only pay when you actually lose weight ($10 per pound, capped at $500). See the full breakdowns: NanoRhino vs MyFitnessPal, NanoRhino vs Cal AI, or browse all comparisons.

How is NanoRhino different from ChatGPT or other general AI assistants?

Three reasons. First, NanoRhino remembers everything you've told it — goals, allergies, last week's wins, your hard days. ChatGPT loses that context across conversations. Second, NanoRhino does the math reliably — calorie counts, macro targets, weekly weight-loss math — without the arithmetic slips a general model makes. Third, NanoRhino is purpose-tuned to be a non-judgmental coach. A general AI tries to be helpful, but it isn't designed to meet you consistently in cravings, shame, or setbacks the way a real coach should.

Where is Link Heart Limited located?

Link Heart Limited is headquartered in Houston, Texas, United States.

Honest comparison

NanoRhino vs MacroFactor

MacroFactor is one of the smartest trackers out there: its adaptive algorithm learns your real metabolic rate from your weight trend and recalculates your macro targets every week — no generic activity multiplier. That math is genuinely excellent. But it's still a tool you run yourself on a subscription. NanoRhino does the targets-from-your-data part too, then coaches you through actually hitting them over text — and only charges when the weight comes off.

Text START to your coach

Pay only for results — $10 per pound lost, capped at $500.

Side by side

NanoRhino vs MacroFactor, honestly.

MacroFactor is a subscription macro-tracking app with an adaptive algorithm that recalculates your targets from your weight trend. Subscription — about $11.99/month, $7.99/month on the 6-month plan, or $5.99/month annually (~$71.99/year) after a 7-day trial as of 2026; no free tier.

Feature and pricing comparison between NanoRhino and MacroFactor
Feature	NanoRhino	MacroFactor
What it is	AI nutrition coach you text (SMS)	Adaptive macro-tracking app
Adapts targets to your data	Yes — coach replans from your weigh-ins	Yes — its signature adaptive algorithm
Coaching & accountability	Yes — check-ins, nudges, replanning	No — you self-run the numbers
Log a meal by photo	Yes — text a photo over SMS	Yes — photo + database logging
App / login required	No — lives in your Messages app	Yes — download + account
Free tier	Free for up to 50 messages/day	No free tier (7-day trial)
Pricing model	Results-based: $10 per pound lost, capped at $500. No subscription, no upfront fee, no charge if you don't lose weight.	Subscription (~$5.99–$11.99/mo depending on term, 2026), pay regardless of results
Charged only if you lose weight	Yes	No

MacroFactor pricing and features reflect publicly available information as of 2026 and may change. NanoRhino is not affiliated with MacroFactor.

No strawmen

Where each one wins.

Where MacroFactor wins

A genuinely excellent adaptive algorithm — it learns your real expenditure from your weight trend and recalibrates targets weekly, no generic activity guess.
Transparent, data-honest macro coaching with a polished app for people who like to run their own numbers.
Strong if you want the smartest self-serve tracker and don't need a coach in the loop.

Where NanoRhino wins

Same adapt-to-your-data idea, but a coach applies it for you and tells you what to eat next — you don't run the app yourself.
Accountability and check-ins when the scale stalls, plus coaching through cravings and hard weeks.
No app, no account — it's a text thread.
Pay only for results: $10 per pound lost, capped at $500 — versus a subscription billed whether the scale moves or not.

Questions

NanoRhino vs MacroFactor, answered.

Does NanoRhino adapt my targets like MacroFactor?

Yes, conceptually. MacroFactor's signature feature is recalculating your macros from your weight trend each week. NanoRhino does the same kind of weigh-in-driven replanning, but a coach applies it for you and turns it into 'eat this, hit this protein' guidance — you don't run the algorithm yourself.

Is NanoRhino cheaper than MacroFactor?

They price differently. MacroFactor is a subscription — roughly $5.99 to $11.99 per month depending on term as of 2026, with no free tier — billed whether or not you lose weight. NanoRhino charges $10 per pound you actually lose, capped at $500, with no subscription and no charge if the weight doesn't come off.

I love running my own numbers. Why add a coach?

If you genuinely enjoy self-managing macros, MacroFactor is excellent and you may not need a coach. NanoRhino is for people who want the numbers handled and a coach in the loop for accountability, meal ideas, and the hard weeks — the part a tracker leaves to you.

Can I text a photo of my meal to NanoRhino?

Yes. Just text a photo of your plate and NanoRhino estimates calories and macros, then coaches you on what to do next. MacroFactor also supports photo logging inside its app; the difference is NanoRhino lives in your Messages app and coaches you in the same thread.

Is my data private with NanoRhino?

Yes. Your conversations live in your Messages app, your health data is encrypted, never sold, never shared with third parties, and never used for advertising, and you can request deletion at any time.

Keep comparing

See how NanoRhino compares to others.

NanoRhino vs Cal AI NanoRhino vs MyFitnessPal NanoRhino vs Noom NanoRhino vs WeightWatchers NanoRhino vs TextCalio NanoRhino vs a human dietitian NanoRhino vs Lose It!NanoRhino vs Cronometer NanoRhino vs MealByMeal NanoRhino vs Simple NanoRhino vs ChatGPT

Or browse all NanoRhino comparisons.

Stop tracking. Start losing.

Text or photo your meal and let an AI coach handle the plan. You only pay when the weight is actually off — $10 per pound, capped at $500.

Text your coach

Not sure of your numbers yet? Start with the free TDEE calculator.