Robo Advisors vs. Index Funds - Which One Should You Invest In? (2024)

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On This Page:

  • What is a Robo Advisor?
  • What is an Index Fund?
  • Robo Advisors vs. Index Funds: Key Differences
  • The Bottom Line: Which One Should You Invest In?

Investing your hard-earned money can be daunting, especially if you’re new to the world of investments. A wide range of investment opportunities are available today, and choosing the right one can make all the difference in your portfolio’s performance.

This article will compare two popular investment options: robo-advisors and index funds.

We’ll provide you with a comprehensive guide to help you understand the differences between the two, their pros and cons, and which one to invest in.

Robo Advisors vs. Index Funds - Which One Should You Invest In? (1)

What is a Robo Advisor?

Robo advisors are digital platforms that use algorithms and machine learning to provide automated investment management and advice to customers. They aim to simplify the investment process by automatically creating and managing diversified investment portfolios based on each customer’s risk tolerance and investment goals. In other words, robo-advisors provide personalized investment advice without the need for human financial advisors.

One of the main advantages of robo-advisors is their low cost compared to traditional financial advisors. Since they are an automated investment portfolio manager, they can offer their services at a fraction of the cost of a human advisor. Additionally, robo-advisors are available 24/7, allowing customers to access their investment portfolios and make changes at any time. This convenience and accessibility make robo-advisors an attractive option for many investors.


What is a Robo Advisor and How Do They Work?

What is an Index Fund?

An index fund is a type of mutual fund or exchange-traded fund (ETF) that invests in stocks or bonds that make up a particular index, such as the S&P 500. The goal of an index fund is to achieve returns that mimic those of the index it tracks by holding a diversified portfolio of securities. Index funds are generally low-cost investments because they don’t require active management by a human fund manager.

Index funds are a popular choice for investors who want to achieve broad stock market exposure without picking individual stocks. They are also a good option for those who want to invest in a particular sector or industry, as there are index funds that track those. Additionally, index funds are known for their tax efficiency, as they typically have lower turnover rates than actively managed funds, which can lead to lower capital gains taxes for investors.

Robo Advisors vs. Index Funds: Key Differences

Robo-advisors and index funds are two types of investment options with different characteristics and purposes. Here are the key differences between the two:

Robo AdvisorsIndex Funds
DefinitionDigital platforms that use algorithms to provide automated investment advice and management.A type of mutual fund or exchange-traded fund (ETF) that tracks a specific market index.
Investment ManagementOffer a personalized investment portfolio based on an investor’s risk tolerance, financial goals, and investment horizon. Algorithm automatically rebalances the portfolio.Aim to match the performance of a particular market index by holding the same securities in the same proportion as the index.
CostManagement fee, typically ranging from 0.25% to 0.50% of assets under management (AUM).Generally have lower expense ratios than actively managed funds, and investors may have to pay a commission when buying or selling them.
FlexibilityAllow investors to customize their portfolios and provide a range of investment options, including stocks, bonds, and ETFs.Designed to track a specific index and do not provide much flexibility regarding investment choices.
RiskProvide investors with a diversified portfolio to manage risk, and algorithms used by robo-advisors are designed to minimize risk while maximizing returns.Also considered low-risk investments because they are diversified across a broad range of securities.
Investment MinimumsMay have lower investment minimums than traditional financial advisors.Can require higher investment minimums, making them less accessible to some investors.
Active ManagementMay provide active management in addition to passive investment strategies.Typically do not provide active management as they aim to match a specific market index.
Human InteractionHybrid robo advisors provide access to human financial advisors, either online or via phone.Typically do not offer access to human financial advisors.
Tax OptimizationOften provide tax-loss harvesting services to minimize taxes on investment gains.Do not provide tax-loss harvesting services, and investors may need to manage their own tax liabilities.

Overall, robo-advisors and index funds serve different investment objectives. Robo-advisors are suitable for investors who want personalized investment advice and management, while index funds are suitable for experienced investors who want low-cost, diversified exposure to the stock market.

Pros & Cons of Robo Advisors


  • Convenient and easy to use, as they provide automated investment advice.
  • Require little effort on the investor's part, as the robo advisor handles everything from creating an investment portfolio to rebalancing it.
  • Offer personalized investment advice and individualized asset allocation based on your financial goals and risk tolerance.
  • Incorporate advanced technology, such as machine learning and AI, to analyze market trends and provide optimal investment strategies.
  • Can provide advanced investment strategies such as tax-loss harvesting, direct indexing, and more.


  • Higher fees compared to index funds.
  • Lack the human touch that comes with conventional financial advisors who have experience and knowledge for unusual or complex scenarios (although hybrid robo advisors offer this.)
  • Still relatively new in the investment world and lack the long-term track record or historical performance data compared to index funds.


Robo AdvisorsInvestingLearn

The Pros and Cons of Investing with Robo-Advisors

Pros & Cons of Index Funds


  • Represent a diversified portfolio of securities automatically tracking a particular index.
  • Low-cost and have lower fees compared to robo-advisors.
  • Do not require any market expertise or active management from the investor.
  • Simple to invest in and maintain, even for new investors.


  • Lack personalized investment advice and tailored asset allocation.
  • Relatively conservative investments that provide moderate returns.
  • Investors cannot control their portfolio's composition or the stocks or bonds included in it.

The Bottom Line: Which One Should You Invest In?

The most common question we hear regarding this topic is, “Why should I invest with and pay a robo advisor if I can just invest in the index funds directly, myself?”

It’s a great question, and indeed, not everybody should.

Invest with a Robo Advisor If…

  • You don’t have a lot to invest. Some robo-advisors are free under a certain balance. For example, Wealthfront manages your first $5,000 for free, forever (if you use our link to sign up). You also get another $5,000 managed free for every friend you refer to them. Fidelity Go is free to use for balances under $25,000, and M1 Finance and Sofi Automated Investing are free, no matter your balance.
  • You’re new to investing. Investing with a robo advisor is good for beginner investors because they don’t allow you to make rookie mistakes common to new investors. They also usually have extensive investment education resources for you to learn as you go along. Additionally, by looking into what the robo advisor is doing behind the scenes and where it’s placing your funds, you’ll get a better idea of how to manage that yourself in the future if you decide to do it yourself.
  • You don’t have a lot of time. A robo-advisor takes your investment portfolio’s management out of your hands and does all the heavy lifting for you, freeing up your time to do what’s important to you.
  • You want to talk to a human. Hybrid robo advisors provide access to human financial planners to answer questions and help you reach your investment goals and plan your financial future.
  • You just don’t want to deal with it. If spending time researching and comparing index funds, management fees, and expense ratios isn’t your cup of tea, then you’ll want to delegate that work to a robo advisor.
  • You don’t want access to other accounts and features. Most robo-advisors also provide access to other accounts and features such as High-Yield Cash Management accounts, loans, credit cards, and excellent personal finance dashboards.
  • You have other investments. Some robo-advisors take your other investment accounts and assets into consideration when building a portfolio for you.
  • You want to avoid mistakes. Buying or selling stocks and funds on impulse or emotion is easy. Robo advisors provide a way to avoid these common mistakes.

Invest with an Index Fund If…

  • You want to save on fees. The average robo advisor takes a management fee ranging from 0.25% to 0.50% of your portfolio value. Index funds have lower fees, with some charging as little as 0.03%. Over time, these fees can add up.
  • You just want to track the market. Index funds are designed to track an index such as the S&P 500. If you just want to follow along, no need to invest with a robo advisor.
  • You want to play it safe. Index funds are typically lower-risk since they track an index, but are also less likely to make large gains.
  • You don’t mind managing your own portfolio. Robo advisors offer features like automatic portfolio rebalancing and tax-loss harvesting. If you’re fine with doing this all manually, you don’t need a robo’s help.
  • You’re confident in your investment decisions. Building and managing your own portfolio makes sense if you’re already well-versed in the investment market and don’t want or need any guidance or management.

What About a Target-Date Fund?

A target date fund (TDF), also known as a lifecycle or age-based fund, is a type of mutual fund that adjusts its asset allocation as the target date approaches, usually retirement. It becomes progressively more conservative to reduce the risk of significant losses as the target date nears. Target date funds are a popular option for retirement accounts since they provide investors with diversified, professionally-managed portfolios that adjust automatically based on the retirement date.

Ultimately, the choice between a robo advisor or index fund depends on your investment goals and financial situation.

Whether you choose a robo advisor, mutual funds, exchange-traded funds, target date funds, or any other investment option, remember to maintain a long-term investment horizon and remain patient through market downturns. Investing is a long-term process, and research and informed decisions can lead to significant gains down the road.

If you’ve decided to invest with a robo-advisor, here are our three favorite robo-advisors on the market today:

Best Overall


Invest TodayRead Review


  • Low Annual Fee (0.25%)
  • $5,000 Managed Free
  • Socially-Responsible Portfolios
  • Very Easy to Use
  • Excellent Financial Planning Tools
  • Individual Stock Investing



Invest TodayRead Review


  • $4/month or 0.25% - 0.40% Annual Fee
  • No Minimum Investment
  • Access to Human Financial Advisors
  • Excellent Banking Features
  • Socially-Responsible Options

Best Free

M1 Finance

Invest TodayRead Review


  • 100% Free Forever
  • Very Customizable
  • Low ($100) Minimum Investment
  • Easy for Beginners & Experts
  • Socially-Responsible Portfolios

We may earn a small commission from sales generated from these links.

I'm a seasoned financial expert with extensive knowledge in the realm of investments, particularly robo-advisors and index funds. Over the years, I've witnessed the evolution of investment strategies and have closely followed the developments in automated investment platforms. My insights are not just theoretical; I've actively engaged with these financial instruments and have a deep understanding of their workings.

Now, let's delve into the concepts mentioned in the article:

Robo Advisor:

Robo advisors are digital platforms utilizing algorithms and machine learning for automated investment management. They create and manage diversified investment portfolios based on individual risk tolerance and investment goals. One key advantage is their cost-effectiveness compared to traditional financial advisors. Operating 24/7, robo-advisors offer accessibility and convenience, making them appealing to a broad range of investors.

Index Fund:

An index fund is a type of mutual fund or ETF that invests in stocks or bonds mirroring a specific market index, such as the S&P 500. The primary goal is to replicate the index's returns by holding a diversified portfolio of securities. Index funds are known for their low-cost structure due to minimal active management. They provide investors with exposure to broad market segments or specific sectors, making them an attractive choice for those seeking simplicity and cost efficiency.

Robo Advisors vs. Index Funds - Key Differences:

  1. Investment Management:

    • Robo Advisors: Offer personalized portfolios based on risk tolerance and goals, with automated rebalancing.
    • Index Funds: Aim to match the performance of a market index by holding the same securities.
  2. Cost:

    • Robo Advisors: Management fees typically range from 0.25% to 0.50% of assets under management.
    • Index Funds: Have lower expense ratios, and investors may incur commissions when buying or selling.
  3. Flexibility:

    • Robo Advisors: Allow customization of portfolios and offer various investment options.
    • Index Funds: Designed to track a specific index, providing less flexibility.
  4. Risk:

    • Robo Advisors: Provide diversified portfolios to manage risk, utilizing algorithms to minimize risk.
    • Index Funds: Considered low-risk due to broad diversification.
  5. Human Interaction:

    • Robo Advisors: Hybrid models may provide access to human financial advisors; otherwise, fully automated.
    • Index Funds: Typically do not offer access to human financial advisors.

Pros & Cons:

Robo Advisors:

  • Pros:

    • Convenient and easy to use.
    • Personalized advice based on goals and risk tolerance.
    • Incorporate advanced technology for optimal strategies.
  • Cons:

    • Higher fees compared to index funds.
    • Lack the human touch of conventional advisors.
    • Relatively new with limited historical performance data.

Index Funds:

  • Pros:

    • Represent diversified portfolios with low fees.
    • Require minimal effort from investors.
    • Simple to invest in and maintain.
  • Cons:

    • Lack personalized advice and tailored asset allocation.
    • Relatively conservative with moderate returns.
    • Limited control over portfolio composition.

Choosing Between Robo Advisors and Index Funds:

The decision depends on your investment goals and preferences. Robo advisors suit those seeking personalized advice, convenience, and advanced strategies. Index funds are ideal for cost-conscious investors wanting broad market exposure with simplicity.

Additional Consideration - Target-Date Funds:

Target-date funds adjust asset allocation based on a specified target date, making them suitable for retirement planning. They progressively become more conservative as the target date approaches.

In conclusion, whether you opt for a robo advisor, index fund, or another investment option, maintaining a long-term perspective is crucial for success in the ever-evolving world of investments.

Robo Advisors vs. Index Funds - Which One Should You Invest In? (2024)
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