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 TextCalio

TextCalio and NanoRhino are the closest mechanically — both run over SMS, so there's no app to download with either. The difference is what happens after you text your meal. TextCalio logs it: it records calories and macros and sends an evening summary. NanoRhino coaches: it logs too, then sets your targets, checks in, adjusts the plan, and only charges when you actually lose weight. Logging is the easy part; the coaching is the product.

Text START to your coach

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

Side by side

NanoRhino vs TextCalio, honestly.

TextCalio is an SMS calorie- and macro-logging tool (no coaching), with a companion web dashboard. Subscription — about $9.99/month or $69.99/year after a 7-day card-up-front trial, billed regardless of results (US & Canada).

Feature and pricing comparison between NanoRhino and TextCalio
Feature	NanoRhino	TextCalio
What it is	AI nutrition coach you text (SMS)	SMS calorie-logging tool
Runs over SMS (no app)	Yes	Yes — same channel
Coaching & accountability	Yes — plans, check-ins, replanning	No — it logs, you self-manage
Adaptive plans & milestones	Yes — weigh-in-driven replanning	No
Log a meal by photo	Yes — text a photo over SMS	Yes — photo / label OCR
Remembers your context	Yes — goals, allergies, history	Stores your log; no coaching memory
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 (~$9.99/mo or ~$69.99/yr, 7-day trial, 2026), pay regardless of results
Charged only if you lose weight	Yes	No

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

No strawmen

Where each one wins.

Where TextCalio wins

Sharp, simple positioning — if you literally just want a number logged by text, it does that cleanly.
A companion web dashboard with editable history and weekly charts.
A live restaurant-menu lookup feature for chain menus.

Where NanoRhino wins

It coaches instead of just logging — adaptive targets, weekly check-ins, and replanning when the scale stalls.
Remembers your goals, allergies, and history, and meets you in cravings and setbacks.
Reliable calorie and macro math, handled in code.
Pay only for results: $10 per pound lost, capped at $500 — versus a flat subscription you pay whether the scale moves or not.

Questions

NanoRhino vs TextCalio, answered.

TextCalio and NanoRhino both work by text — what's the real difference?

TextCalio logs; NanoRhino coaches. Both run over SMS with no app. TextCalio records your calories and macros and sends a daily summary. NanoRhino logs your meals too, but then sets your calorie and protein targets, checks in weekly, explains why the scale moved, and adjusts your plan — and it only charges when you actually lose weight.

How does the pricing compare to TextCalio?

TextCalio is a flat subscription — about $9.99/month or $69.99/year after a 7-day card-up-front trial 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 text a photo of my meal to NanoRhino?

Yes. Both tools accept meal photos over SMS. NanoRhino estimates calories and macros from the photo and then coaches you on what to do next — hitting your protein, staying on target, and adjusting as the week goes.

Is NanoRhino available outside the US?

SMS coaching is live in the US at (915) 277-7888, with more channels coming. The free TDEE calculator at nanorhino.com/tdee works worldwide. TextCalio operates in the US and Canada.

Why pay per pound instead of a flat monthly fee?

Because it aligns our incentives with yours. A flat subscription gets paid whether you lose weight or not. NanoRhino only gets paid when you do — $10 per pound, capped at $500 — so the whole product is built to actually move the scale, not just keep you logging.

Keep comparing

See how NanoRhino compares to others.

NanoRhino vs Cal AI NanoRhino vs MyFitnessPal NanoRhino vs Noom NanoRhino vs WeightWatchers 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.