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 Simple

Simple is a capable, broad app — AI coaching (Coach Avo), fasting timers, nutrition tracking, and an educational library all in one place. If you want a polished all-in-one app and like fasting features, it's a reasonable pick. NanoRhino is narrower and deeper on one thing: a coach that lives in your text messages, remembers your history, and only charges when you actually lose weight.

Text START to your coach

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

Side by side

NanoRhino vs Simple, honestly.

Simple is a broad AI fasting and nutrition coaching app (timers, tracking, AI tips, education). Subscription with variable onboarding-quiz pricing — commonly about $49.99–$59.99/year (under ~$5/month) or up to ~$30/month monthly as of 2026, after a short trial.

Feature and pricing comparison between NanoRhino and Simple
Feature	NanoRhino	Simple
What it is	AI nutrition coach you text (SMS)	AI fasting + nutrition coaching app
Coaching	Text-native coach with persistent memory	In-app AI coach + educational library
Fasting features	Coach supports fasting if that's your plan	Yes — fasting timers are a core feature
Remembers your history	Yes — goals, allergies, past weeks	In-app profile; varies
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 (~$5–$30/mo depending on term, variable pricing, 2026), pay regardless of results
Charged only if you lose weight	Yes	No

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

No strawmen

Where each one wins.

Where Simple wins

A broad, polished all-in-one app — AI coaching, fasting timers, tracking, and an educational library together.
Strong fasting features if intermittent fasting is central to your plan.
A good fit if you prefer a single app experience over a text thread.

Where NanoRhino wins

Text-native — coaching lives in your Messages app, available the moment you need it, with no app to open.
Persistent memory of your goals, allergies, and history, so you never re-explain yourself.
Reliable calorie and protein math handled in code, with a coach focused on weight loss.
Pay only for results: $10 per pound lost, capped at $500 — versus a subscription billed whether the scale moves or not, often with variable onboarding-quiz pricing.

Questions

NanoRhino vs Simple, answered.

Is NanoRhino an app like Simple?

No — that's the main difference. Simple is a downloadable app with fasting timers, tracking, and an in-app AI coach. NanoRhino is a coach that lives in your text messages: no app, no login, just a thread you text whenever you need it.

Does NanoRhino do fasting like Simple?

Simple is built around fasting, with timers as a core feature. NanoRhino's coach can support a fasting approach if that's your plan, but its focus is calorie and protein coaching for sustainable weight loss rather than fasting tooling specifically.

How does the pricing compare to Simple?

Simple is a subscription with variable onboarding-quiz pricing — commonly around $49.99–$59.99/year, or up to about $30/month monthly 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.

Does NanoRhino remember my history?

Yes. NanoRhino remembers your goals, allergies, preferences, and past weeks, so the conversation gets smarter over time and you never start over.

Do I have to download an app?

No. 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 WeightWatchers NanoRhino vs TextCalio NanoRhino vs a human dietitian NanoRhino vs MacroFactor NanoRhino vs Lose It!NanoRhino vs Cronometer NanoRhino vs MealByMeal 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.