Exhibit 99.1

Constant Contact Announces Second Quarter 2013 Financial Results

Revenue of $70.2 Million and Adjusted EBITDA of $9.5 Million

Raises Adjusted EBITDA Guidance for the Year

WALTHAM, MA – July 25, 2013 – Constant Contact®, Inc. (Nasdaq: CTCT), which helps more than half a million small organizations connect with their customers through a suite of online marketing tools, today announced its financial results for the second quarter ended June 30, 2013.

“Our second quarter results marked another quarter of consistent execution, as each of our primary growth drivers — new customer additions, average monthly revenue per customer (ARPU) and retention — reflected positive year-on-year trends,” said Gail Goodman, chief executive officer of Constant Contact. “I am pleased with the performance of our core business and excited about our progress towards delivering a robust suite of integrated online marketing tools for small businesses. We are rolling out our enhanced contacts functionality to customers, a cornerstone of our multi-product suite and a significant milestone in the evolution of Constant Contact.”

Second Quarter 2013 Financial Metrics

Operating Metrics

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Other Recent Highlights

“We are pleased with our second quarter results with revenue in line with expectations and profitability above expectations. With continued gains in ARPU and customer retention combined with sequential and year-on-year decreases in the cost to acquire a customer, we are driving meaningful improvement in customer lifetime value. These gains and the resulting positive impact on margins give us the confidence to raise our full year guidance for adjusted EBITDA for the second consecutive quarter,” said Harpreet Grewal, chief financial officer of Constant Contact. “Looking ahead to the remainder of the fiscal year, we will maintain our focus on delivering consistently good results while we carry out our longer-term vision to transform Constant Contact into a true multi-product company.”

Business Outlook

Constant Contact is issuing guidance for the third quarter and full year 2013 as follows:

Third Quarter 2013:

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Full Year 2013:

Non-GAAP Financial Measures

This press release contains the following non-GAAP financial measures: adjusted EBITDA, adjusted EBITDA margin, non-GAAP net income, non-GAAP net income per share, estimated cash tax rate and free cash flow.

Adjusted EBITDA is a non-GAAP financial measure that is defined as GAAP net income (loss) before income taxes, interest income and other income (expense), net, depreciation and amortization, stock-based compensation, litigation contingency accruals and contingent consideration adjustments. Adjusted EBITDA margin is a non-GAAP financial measure that is calculated by dividing adjusted EBITDA by revenue.

Non-GAAP net income is a non-GAAP financial measure that is defined as GAAP net income (loss) before the non-cash portion of income taxes, stock-based compensation expense, litigation contingency accruals and contingent consideration adjustments. Non-GAAP net income per share is a non-GAAP financial measure that is calculated by dividing non-GAAP net income (loss) by the weighted average shares outstanding.

Estimated cash tax rate is calculated by dividing estimated taxes to be paid by estimated full year income before taxes.

Free cash flow is calculated by subtracting cash paid for the acquisition of property and equipment from net cash provided by operating activities.

Constant Contact believes that these non-GAAP measures of financial results provide useful information to management and investors regarding certain financial and business trends relating to Constant Contact’s financial condition and results of operations. The company’s management

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uses these non-GAAP measures to compare the company’s performance to that of prior periods for trend analyses, for purposes of determining executive and senior management incentive compensation, and for budgeting and planning purposes. These measures are used in monthly financial reports prepared for management and in monthly and quarterly financial reports presented to the company’s board of directors. The company believes that the use of these non-GAAP financial measures provides an additional tool for investors to use in evaluating ongoing operating results and trends and in comparing the company’s financial measures with other software-as-a-service companies, many of which present similar non-GAAP financial measures to investors.

Management of the company does not consider these non-GAAP measures in isolation or as an alternative to financial measures determined in accordance with GAAP. The principal limitation of these non-GAAP financial measures is that they exclude significant expenses and income that are required by GAAP to be recorded in the company’s financial statements. In addition, they are subject to inherent limitations as they reflect the exercise of judgments by management about which expenses and income are excluded or included in determining these non-GAAP financial measures. In order to compensate for these limitations, management presents non-GAAP financial measures in connection with GAAP results. Constant Contact urges investors to review the reconciliation of its non-GAAP financial measures to the comparable GAAP financial measures, which it includes in press releases announcing quarterly financial results, including this press release, and not to rely on any single financial measure to evaluate the company’s business.

Reconciliation tables of the most comparable GAAP financial measures to the non-GAAP financial measures used in this press release are included with the financial tables at the end of this release.

Conference Call Information

Live and replay conference ID code: 95419305

The webcast will be archived on Constant Contact’s website for a period of three months.

About Constant Contact, Inc.

Constant Contact wrote the book on Engagement Marketing™ – the new marketing success formula that helps small organizations create and grow customer relationships in today’s socially connected world. More than half a million small businesses, nonprofits and associations worldwide use the company’s online marketing tools to generate new customers, repeat business, and

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referrals through email marketing, social media marketing, event marketing, local deals, digital storefronts, and online surveys. Only Constant Contact offers the proven combination of affordable tools and free KnowHow^®, including local seminars, personal coaching and award-winning product support. The company further supports small organizations through its extensive network of consultants/resellers, technology providers, franchises and national associations.

Constant Contact and the Constant Contact Logo are registered trademarks of Constant Contact, Inc. All Constant Contact product names and other brand names mentioned herein are trademarks or registered trademarks of Constant Contact, Inc. All other company and product names may be trademarks or service marks of their respective owners.

Cautionary Language Concerning Forward-Looking Statements

This press release contains “forward-looking statements” within the meaning of the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995, including but not limited to, statements regarding Constant Contact’s transformation to a multi-product company, the company’s ability to deliver a robust suite of integrated online marketing tools, the company’s share repurchase program and the company’s financial guidance for the third quarter of 2013 and full year 2013. These forward-looking statements are made as of the date they were first issued and were based on current expectations, estimates, forecasts and projections as well as the beliefs and assumptions of management. Words such as “expect,” “anticipate,” “should,” “believe,” “hope,” “target,” “project,” “goals,” “estimate,” “potential,” “predict,” “may,” “will,” “might,” “could,” “intend,” variations of these terms or the negative of these terms and similar expressions are intended to identify these forward-looking statements. Forward-looking statements are subject to a number of risks and uncertainties, many of which involve factors or circumstances that are beyond Constant Contact’s control. Constant Contact’s actual results could differ materially from those stated or implied in forward-looking statements due to a number of factors, including but not limited to, the company’s ability to attract new customers and retain existing customers, the company’s dependence on the market for email marketing services for small organizations, adverse economic conditions in general and adverse economic conditions specifically affecting the markets in which the company operates, the company’s ability to successfully develop and introduce new products and add-ons or enhancements to existing products and integrate its products in an effective manner, the successful integration of SinglePlatform, adverse regulatory or legal developments, litigation risk and expense, the company’s ability to continue to promote and maintain its brand in a cost-effective manner, changes in the competitive environment, the company’s ability to compete effectively, the company’s ability to attract and retain key personnel, the company’s ability to protect its intellectual property and other proprietary rights, and other risks detailed in Constant Contact’s most recent Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission as well as other documents that may be filed by the company from time to time with the Securities and Exchange Commission. Past performance is not necessarily indicative of future results. The forward-looking statements included in this press release represent Constant Contact’s views as of the date of this press release. The company anticipates that subsequent events and developments will cause its views to change. Constant Contact undertakes no intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. These forward-looking statements should not be relied upon as representing Constant Contact’s views as of any date subsequent to the date of this press release.

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(CTCT-F)

Media Contact:

Erika Tower

Constant Contact

(781) 482-7039

pr@constantcontact.com

Investor Contact:

Jeremiah Sisitsky

Constant Contact

(339) 222-5740

ir@constantcontact.com

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Constant Contact, Inc.

Consolidated Condensed Statements of Operations (unaudited)

(In thousands, except per share data)

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Constant Contact, Inc.

Calculation of Adjusted EBITDA and Adjusted EBITDA Margin (unaudited)

(In thousands)

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Constant Contact, Inc.

Calculation of Non-GAAP Net Income and Non-GAAP Net Income per Share (unaudited)

(In thousands, except per share data)

Constant Contact, Inc.

Calculation of Free Cash Flow (unaudited)

(In thousands)

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Constant Contact, Inc.

Consolidated Condensed Statements of Cash Flows (unaudited)

(In thousands)

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Constant Contact, Inc.

Consolidated Condensed Balance Sheets (unaudited)

(In thousands)

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