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.

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 WeightWatchers

Q: 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.

WeightWatchers earned its reputation — decades of brand trust, a proven Points system, and a community that keeps people accountable, in person and online. That community is a real strength. The trade-off is a monthly subscription you pay regardless of results, plus the Points system to learn. NanoRhino skips the points and the app: text or photo your meal and an AI coach handles the math and the plan — and only charges when the weight is actually off.

Text START to your coach

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

Side by side

NanoRhino vs WeightWatchers, honestly.

WeightWatchers is an established weight-loss program built on the Points system, with app, community, and optional clinic/medication plans. Subscription — promotional rates around $10–$20/month for the first year on digital plans, then roughly $23+/month standard as of 2026; clinic/medication plans cost more.

Feature and pricing comparison between NanoRhino and WeightWatchers
Feature	NanoRhino	WW
What it is	AI nutrition coach you text (SMS)	Points-based program + community
Tracking system	Calories & protein, math handled for you	Points system (you learn & track Points)
Coaching & accountability	AI coach with persistent memory, anytime	Community + workshops; coaching varies by plan
Community	Private 1:1 — no social feed	Strong — in-person & online community
Log a meal by photo	Yes — text a photo over SMS	App-based logging (Points)
App / login required	No — lives in your Messages app	Yes — download + account
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 (~$10–$23+/mo depending on term, 2026), pay regardless of results
Charged only if you lose weight	Yes	No

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

No strawmen

Where each one wins.

Where WeightWatchers wins

Decades of brand trust and one of the most studied commercial weight-loss programs.
A genuine community — in-person workshops and online groups that keep many people accountable.
An established Points framework that some people find simpler than counting calories.

Where NanoRhino wins

No points to learn — text or photo your meal and the coach handles the calorie and protein math.
Always-available 1:1 coaching that remembers your context, in your Messages app — no app to open.
A private, judgment-free space — no social feed, no sharing.
Pay only for results: $10 per pound lost, capped at $500 — versus a subscription billed whether or not you lose weight.

Questions

NanoRhino vs WeightWatchers, answered.

Do I have to learn a Points system with NanoRhino?

No. WeightWatchers is built around its Points system, which some people like and others find one more thing to track. NanoRhino works in plain calories and protein and does the math for you — you just text what you ate or send a photo.

Does NanoRhino have a community like WeightWatchers?

No — and that's deliberate. WW's community is a real strength if group accountability motivates you. NanoRhino is a private, judgment-free 1:1 coach in your Messages app, with no social feed and nothing shared. If you want community, WW wins there; if you want privacy and a coach on speed dial, NanoRhino is built for that.

How does the cost compare to WW?

WW is a subscription — often around $10–$20/month promotionally in the first year on digital plans, then roughly $23+/month standard as of 2026 — 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.

Is NanoRhino as established as WeightWatchers?

WeightWatchers has decades of history and research behind it — that's a fair point in its favor. NanoRhino is a newer, AI-first coach built around results-based pricing and SMS coaching. We compete on the model — pay only for pounds lost — and on always-available coaching, not on tenure.

Do I need to download an app?

No. WW runs in its app and at workshops. NanoRhino runs over SMS in your Messages app — text START to (915) 277-7888 to begin. An optional iOS app exists but isn't required.

Keep comparing

See how NanoRhino compares to others.

NanoRhino vs Cal AI NanoRhino vs MyFitnessPal NanoRhino vs Noom NanoRhino vs TextCalio NanoRhino vs a human dietitian NanoRhino vs MacroFactor 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.