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 Cal AI

Cal AI built one of the slickest photo-calorie experiences on the App Store: snap a plate, get calories and macros in seconds. It's a genuinely good tracker. But a tracker hands you a number and walks away. NanoRhino is a coach you text — it logs your meals over SMS too, then tells you what to do with the numbers, remembers your week, and only charges when the weight actually comes off.

Text START to your coach

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

Side by side

NanoRhino vs Cal AI, honestly.

Cal AI is an AI photo-calorie tracking app (snap a meal, get calories and macros). Subscription app with dynamic pricing — commonly ~$5.99/week or roughly $70–$100/year as of 2026, after a short free trial.

Feature and pricing comparison between NanoRhino and Cal AI
Feature	NanoRhino	Cal AI
What it is	AI nutrition coach you text (SMS)	AI photo-calorie tracking app
Coaching & accountability	Yes — adaptive plans, weekly check-ins, replanning	No — it tracks, you self-manage
Log a meal by photo	Yes — text a photo over SMS	Yes — photo is the core feature
Remembers your history & context	Yes — goals, allergies, past weeks, hard days	Stores your log; no coaching memory
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 (~$5.99/wk or ~$70–$100/yr, 2026), pay regardless of results
Charged only if you lose weight	Yes	No

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

No strawmen

Where each one wins.

Where Cal AI wins

A polished, fast native-app experience with a refined photo-scan UX — the category leader for a reason.
Instant on-screen visual feedback and trends inside a dedicated app, if you prefer tapping through screens over texting.
Strong if all you want is a tracker and you don't want a coach in the loop.

Where NanoRhino wins

It coaches, not just counts — adaptive calorie targets, protein guidance, milestones, and weigh-in-driven replanning.
No app and no login — it's a text thread in your Messages app.
Reliable calorie math plus a coach who remembers your goals, allergies, and last week's wins.
Pay only for results: $10 per pound lost, capped at $500 — not a subscription you pay whether the scale moves or not.

Questions

NanoRhino vs Cal AI, answered.

Is NanoRhino just another tracker like Cal AI?

No. Cal AI is a tracker — it tells you the calories in your meal and stops there. NanoRhino logs meals too (text or photo a plate over SMS), but the product is the coaching: it sets your calorie and protein targets, checks in weekly, explains why the scale moved or didn't, and adjusts your plan as life changes.

How does NanoRhino's pricing compare to Cal AI's?

Cal AI is a subscription — commonly around $5.99/week or roughly $70–$100 per year as of 2026 — and you pay whether or not you lose weight. NanoRhino is results-based: $10 per pound you actually lose, capped at $500 total, with no subscription and no charge if the weight doesn't come off.

Is photo calorie counting accurate?

Photo estimation across the whole category sits around plus-or-minus 10%, and that's true for any AI tracker including Cal AI. NanoRhino uses photo estimates as a coaching input, not a verdict — the coach focuses on consistency and trend over time rather than chasing a perfect per-meal number.

Do I have to download an app to use NanoRhino?

No. Cal AI requires a download and an account. NanoRhino runs entirely over SMS in your Messages app — text START to (915) 277-7888 to start. There's an optional iOS app, but it isn't required.

Can I switch from Cal AI to NanoRhino easily?

Yes. There's nothing to migrate — just text the coach what you're working on and it builds your plan from there. You can keep using Cal AI to scan meals if you like the app and let NanoRhino handle the coaching and accountability.

Keep comparing

See how NanoRhino compares to others.

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 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.