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 Cronometer

Cronometer is the most precise tracker in the category — it logs 80-plus micronutrients with carefully curated data, which is a real edge if you care about vitamins, minerals, and nutrient gaps. For data nerds, nothing beats it. But that precision is also higher-effort, and it's still a self-serve log. NanoRhino trades some micronutrient depth for far lower friction and a coach who actually helps you lose weight — and only charges when you do.

Text START to your coach

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

Side by side

NanoRhino vs Cronometer, honestly.

Cronometer is a micronutrient-precision tracking app logging 80+ nutrients from a curated database. Free tier available; Gold about $4.99/month annually (~$59.88/year) or ~$10.99/month monthly as of 2026.

Feature and pricing comparison between NanoRhino and Cronometer
Feature	NanoRhino	Cronometer
What it is	AI nutrition coach you text (SMS)	Micronutrient-precision tracker
Micronutrient depth	Calories, macros & protein focus	Best in class — 80+ nutrients tracked
Coaching & accountability	Yes — plans, check-ins, replanning	No — you log and self-manage
Effort to log	Text it in words or a photo	Precise entry — higher effort
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.	Free tier or Gold (~$4.99–$10.99/mo, 2026), pay regardless of results
Charged only if you lose weight	Yes	No

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

No strawmen

Where each one wins.

Where Cronometer wins

Unmatched micronutrient precision — 80-plus nutrients from a carefully curated database, ideal for vitamins, minerals, and nutrient-gap tracking.
The right tool for data-driven users, specific medical diets, or anyone optimizing nutrient quality, not just calories.
A capable free tier and an affordable Gold upgrade.

Where NanoRhino wins

Far lower friction — text or photo your meal instead of precise manual entry.
A coach who turns the numbers into action and keeps you accountable, which a tracker doesn't do.
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 Cronometer, answered.

Does NanoRhino track micronutrients like Cronometer?

Not to the same depth — that's Cronometer's specialty, and it's genuinely the best at it (80-plus nutrients). NanoRhino focuses on calories, macros, and especially protein, with coaching on top. If micronutrient precision is your priority, Cronometer wins there; if you want lower-friction logging plus a coach to actually lose weight, NanoRhino is built for that.

How does the pricing compare to Cronometer Gold?

Cronometer has a free tier and a Gold subscription — roughly $4.99/month annually or about $10.99/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.

Can I use both Cronometer and NanoRhino?

Yes — they complement each other well. Use Cronometer for deep nutrient analysis, and let NanoRhino coach you on weight loss, protein targets, and accountability over text.

Is logging by text accurate enough without precise entry?

For weight loss, consistency matters more than per-meal precision. NanoRhino estimates from your text or photo and coaches on the trend over time. If you need exact micronutrient figures, that's where a precision tracker like Cronometer earns its keep.

Do I have to download an app for NanoRhino?

No. Cronometer is an app with an account. NanoRhino runs over SMS in your Messages app — text START to (915) 277-7888. 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 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.