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 ChatGPT

ChatGPT is genuinely useful and free, and plenty of people use it to estimate calories or brainstorm meals — fair enough. The honest gaps for weight loss are structural, not quality: a general assistant doesn't persistently remember your goals and history across chats, doesn't hold a structured plan, doesn't check in or keep you accountable, and a general model can slip on arithmetic. NanoRhino is purpose-built for exactly that: memory, a plan, weekly check-ins, calorie math handled in code, and pricing tied to results.

Text START to your coach

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

Side by side

NanoRhino vs ChatGPT, honestly.

ChatGPT is a free, general-purpose AI assistant people sometimes use to estimate calories or plan meals. Free to use; an optional paid tier (~$20/month as of 2026) adds capacity and features but doesn't make it a weight-loss coach.

Feature and pricing comparison between NanoRhino and ChatGPT
Feature	NanoRhino	ChatGPT
What it is	Purpose-built AI nutrition coach (SMS)	General-purpose AI assistant
Remembers your goals & history	Yes — persistent across every message	Limited — loses context across chats
Structured weight-loss plan	Yes — targets, protein floor, milestones	No — answers prompts, no held plan
Accountability & check-ins	Yes — weekly check-ins and nudges	No — only when you open it
Reliable calorie math	Yes — math handled in code	Variable — general models can slip
Log a meal by photo	Yes — text a photo over SMS	Can estimate from a photo, but doesn't track it
Pricing model	Results-based: $10 per pound lost, capped at $500. No subscription, no upfront fee, no charge if you don't lose weight.	Free (optional ~$20/mo tier); general-purpose, not a coach

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

No strawmen

Where each one wins.

Where ChatGPT wins

Free, instantly available, and genuinely smart for one-off questions — estimate a meal, brainstorm a recipe, explain a nutrition concept.
Completely general: it does everything else too, not just nutrition.
A great companion for ad-hoc questions if you don't need memory, a plan, or accountability.

Where NanoRhino wins

Persistent memory — it remembers your goals, allergies, and last week's wins; a general chat starts fresh.
A held, structured plan with protein targets and milestones, not just answers to whatever you ask.
Accountability built in — weekly check-ins and nudges, instead of help only when you remember to open it.
Reliable calorie and macro math handled in code, plus results-based pricing: $10 per pound lost, capped at $500.

Questions

NanoRhino vs ChatGPT, answered.

Can't I just use ChatGPT to count calories for free?

You can, and for one-off estimates it's handy. The gaps for weight loss are structural: ChatGPT doesn't persistently remember your goals and history across chats, doesn't hold a structured plan, doesn't check in or keep you accountable, and a general model can make arithmetic slips. NanoRhino is purpose-built for all of that.

Is NanoRhino just ChatGPT with a different wrapper?

No. NanoRhino is a purpose-tuned coach with persistent memory of you, a structured weight-loss plan, weekly check-ins, calorie math handled in code rather than guessed by the model, and pricing tied to results. A general assistant has none of those by design.

Does NanoRhino remember me between messages?

Yes — that's a core difference. NanoRhino remembers your goals, allergies, preferences, and past weeks every time you text. General chat tools tend to lose that context from one conversation to the next.

How is the pricing different?

ChatGPT is free, with an optional paid tier (around $20/month as of 2026) — but you're paying for a general assistant, not a weight-loss coach, and it gets paid regardless of your results. NanoRhino charges $10 per pound you actually lose, capped at $500, with no charge if the weight doesn't come off.

Do I need an app or login for NanoRhino?

No. NanoRhino runs over SMS in your Messages app — text START to (915) 277-7888 to begin. No app, no account.

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 MacroFactor NanoRhino vs Lose It!NanoRhino vs Cronometer NanoRhino vs MealByMeal NanoRhino vs Simple

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.