# WeightWise — AI Connector

Fitness calculators for BMI, body fat, and calorie needs. WeightWise is listed under Healthcare in the ChatGPT apps directory, built by Layer 3 Labs.

Source: https://node8.ai/ai-connectors/healthcare/weightwise/

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[AI Connectors](https://node8.ai/ai-connectors/) · [Healthcare & Life Sciences](https://node8.ai/ai-connectors/healthcare/)

# WeightWise

Fitness calculators for BMI, body fat, and calorie needs

Listed in ChatGPT

[ChatGPT listing](https://chatgpt.com/plugins/weightwise?open_in_app)

Overview

## What WeightWise does

WeightWise from Layer 3 Labs gathers a set of standard health calculations into a single ChatGPT app. It covers body mass index, an estimate of body fat percentage, ideal weight ranges, and daily energy requirements expressed as BMR and TDEE.

These are calculations that have circulated in fitness literature for decades. What the app changes is the interface. Rather than loading a web form and filling in fields, a person asks in conversation and the figure comes back.

The described function is calculation rather than tracking, so the output is a number based on the inputs given at the time of asking.

### Who it is for

Anyone doing quick fitness arithmetic, such as a person setting a calorie target or checking a BMI figure without opening a separate tool.

### What stands out

It groups four related calculations that normally sit on four different websites behind one request.

Availability

## Where WeightWise is listed

WeightWise is listed in the ChatGPT apps directory only. Layer 3 Labs has no connector under the same domain in the Claude directory; 392 of the 3,150 products here are on both marketplaces, and this is not one of them.

ChatGPT apps are built on MCP, and the same server can back a Claude connector, so the absence is a distribution decision rather than a technical one.

ChatGPT listing

## In the ChatGPT apps directory

Developer

Layer 3 Labs

Filed under

Healthcare

Listed since

June 2026

Authentication

Authenticates when installed

Policies published

Privacy policy · Terms of service

Official listing

[Open in ChatGPT](https://chatgpt.com/plugins/weightwise?open_in_app)

Snapshot

August 2026

### Example prompts from the listing

-   What's my Body Mass Index (BMI)?
-   What's my ideal weight for my age?
-   What's my body fat percentage?

Nearby

## Other Healthcare & Life Sciences connectors

### [Nexus](https://node8.ai/ai-connectors/healthcare/nexus/)

Workout, meal and body weight logging inside the chat

Claude

### [AI Endurance](https://node8.ai/ai-connectors/healthcare/ai-endurance/)

AI coaching for running, cycling and triathlon

ChatGPT

### [Insight Timer](https://node8.ai/ai-connectors/healthcare/insight-timer/)

Search a meditation and sleep audio library

ChatGPT

### [instingo - Schritte Challenge](https://node8.ai/ai-connectors/healthcare/instingo-schritte-challenge/)

Corporate step challenges for German teams

ChatGPT

### [Joules](https://node8.ai/ai-connectors/healthcare/joules/)

Cycling training review and weekly planning in ChatGPT

ChatGPT

### [Kenso](https://node8.ai/ai-connectors/healthcare/kenso/)

Training, recovery and nutrition data from a Kenso account

ChatGPT

[All 101 Healthcare & Life Sciences connectors](https://node8.ai/ai-connectors/healthcare/)

This is an independent catalogue entry compiled by Node8 from WeightWise's public marketplace listing as it stood in August 2026. Listing facts come from the marketplaces; the comparisons against the rest of the directory and any live-endpoint measurements are Node8's. Node8 is not affiliated with Layer 3 Labs, and inclusion here is not an endorsement.

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