Choosing an insulin pump can feel like a big decision, but it doesn’t have to be complicated. In this guide, we’ll help you understand two of the newest and most talked-about pumps: the Tandem Mobi and the Beta Bionics iLet Bionic Pancreas. You’ll learn what makes each one unique and how to figure out which might be a better fit for your life and your diabetes management goals.

Safety Note: This information is for educational purposes only. Always talk with your healthcare provider to decide which medical device is right for you.

The Biggest Difference: How They Think

Before we look at the pumps themselves, it’s important to understand the philosophy behind them. This is what truly sets them apart.

Tandem Mobi: You’re the Pilot, with a Smart Co-Pilot

The Tandem Mobi uses Control-IQ+ technology. Think of it as a smart assistant that works with you. You (and your doctor) will still set up your core insulin rates, like your carb ratios and correction factors. You will also continue to count carbs when you eat.

The “smart” part comes from how it works with your CGM. The Mobi predicts where your glucose will be in 30 minutes and automatically adjusts your background insulin to help prevent highs and lows. It helps smooth out the bumps in the road, but you are still in the driver’s seat.

Beta Bionics iLet: Your Personal Chauffeur

The iLet takes a very different approach. Its goal is to let you think about diabetes less. To get started, you only need to enter your body weight. There are no carb ratios or correction factors to program.

The biggest change is that you don’t count carbs. When you eat, you simply tell the pump if your meal is “Usual,” “Less,” or “More” than normal. The pump learns your needs and handles all the insulin dosing decisions from there. It’s designed to do the driving for you.

A Look at the Pumps: Features and Feel

Both the Tandem Mobi and the iLet are modern, tubed pumps, but they look and feel very different.

Tandem Mobi

The Mobi is all about being small and discreet. It’s the smallest durable automated insulin pump available.

• Size and Wear: It’s tiny—about half the size of other pumps. You can clip it to your clothes, put it in a pocket, or use an adhesive sleeve to wear it directly on your body like a patch pump. It has a short 5-inch tubing option to make this easier.
• Control: There is no screen on the pump itself. You control it completely through an app on a compatible iPhone. For convenience, it has a physical button on the pump that lets you deliver a bolus without your phone.
• Insulin Capacity: It holds up to 200 units of insulin.
• Durability: The Mobi is fully waterproof (IP28), meaning it can be submerged in up to 8 feet of water for two hours.

Beta Bionics iLet

The iLet is designed for simplicity and ease of use.

• Size and Wear: It’s a bit larger than the Mobi but is still a compact, modern device. It’s a traditional tubed pump, so you wear it in a pocket or clipped to your clothing.
• Control: You interact with the pump directly using its color screen. You’ll use this to announce your meals.
• Insulin Capacity: It holds up to 180 units of insulin.
• Durability: The iLet is also highly water-resistant (IPX8), protected in up to 12 feet of water for 30 minutes.
  
  

Side-by-Side Comparison

Here’s a simple chart to see the key differences at a glance.

How to Choose: What Matters Most to You?

Deciding between the Mobi and the iLet comes down to your personal preferences and what you need from your diabetes technology. Here are a few questions to ask yourself.

1. How do you feel about carb counting?

This is often the most important question.

• Lean toward the iLet if: You are tired of the daily math. If you find carb counting stressful or time-consuming, the iLet’s “meal announcement” feature could be a welcome change.
• Lean toward the Mobi if: You prefer having precise control. If you are good at carb counting and like to know exactly how your insulin is dosed, the Mobi’s system will feel familiar and powerful.

2. How important is size and discretion?

• Lean toward the Mobi if: A small, discreet pump is your top priority. Its tiny size and flexible wearing options make it easy to hide under clothing. The full smartphone control also means you don’t have to pull a device out of your pocket to bolus.
• Lean toward the iLet if: You don’t mind a slightly larger, more traditional pump size and prefer interacting with the device itself instead of a phone.

3. Do you prefer a hands-on or hands-off approach?

• Lean toward the Mobi if: You want to be involved in your management. The Mobi empowers you with data and control, with Control-IQ+ acting as your safety net.
• Lean toward the iLet if: You want the pump to handle as much as possible. If you trust the technology and want to offload the decision-making, the iLet is built for that.
  
  

Next Steps

Choosing a new pump is a big step, but you don’t have to figure it out by yourself. The best pump is the one that fits your life and helps you feel your best.

Our team can help you understand your options and check your insurance to see what’s covered. We are here to provide clear, simple guidance so you can make a choice with confidence.

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